Dry type full-insulation tubular busbar intermediate joint connector

Abstract

The utility model relates to bus connection technical field especially is dry type full insulation tubular bus middle joint connector, including two symmetrical clamping seat, all are provided with semicircle clamping cavity in the middle part of the inner side wall of each clamping seat, two semicircle clamping cavities form the conductor clamping space for bus to wear into cooperation, and the conductor of two buses is coaxial and sets up and the end face butt joint resistance, and the both sides of two clamping seats respectively extend horizontally outward and form the connecting seat, and the both sides of two clamping seats respectively extend horizontally outward and form the connecting seat, and the both sides of two clamping seats respectively extend horizontally outward and form the connecting seat, and the both sides of two clamping seats respectively extend horizontally outward and form the connecting seat, and the both sides of two clamping seats respectively extend horizontally outward and form the connecting seat, and the both sides of two clamping seats respectively extend horizontally outward and form the connecting seat, and the both sides of two clamping seats respectively extend horizontally outward and form the connecting seat, and the both side

Description

Technical Field

[0001] This utility model relates to the field of busbar connection technology, and in particular to dry-type fully insulated tubular busbar intermediate joint connectors. Background Technology

[0002] Dry-type fully insulated tubular busbars are widely used in power projects such as power plants, substations, and large industrial enterprises due to their advantages of small size, excellent insulation performance, maintenance-free operation, and strong short-circuit withstand capability. They are responsible for the transmission of electrical energy between generators, transformers, and switchgear. One of their core accessories, the intermediate joint connector, is used to realize the electrical connection and mechanical fixation of two busbar sections and is a key component to ensure the stability of the busbar system.

[0003] Currently, the traditional structure of dry-type fully insulated tubular busbar intermediate joint connectors typically includes:

[0004] Conductor connection assembly: mostly uses copper or aluminum sleeves to connect the conductors of two busbar sections by bolt fastening or crimping;

[0005] Insulation compensation structure: Insulating tape, heat shrink tubing or prefabricated insulating parts are wrapped around the conductor connection to restore the insulation performance of the busbar body;

[0006] Shielding layer connection: The metal shielding layers (such as copper mesh) of the two busbars are connected by metal braided strips or copper strips to achieve electric field shielding and grounding functions;

[0007] Mechanical fasteners: Use clamps, brackets or flanges to ensure the mechanical strength of the connection.

[0008] However, this traditional structure has the following main problems during installation and construction:

[0009] First, the installation process is complex, time-consuming and labor-intensive: traditional connections require multiple wrappings of insulation material or layer-by-layer installation of prefabricated components, which is highly dependent on the experience of construction personnel and is prone to causing air bubbles, wrinkles or uneven thickness of the insulation layer due to improper operation, which may lead to partial discharge risk.

[0010] Secondly, the bolt tightening or crimping process requires precise torque control. Improper operation may cause the conductor connection to loosen or be damaged, affecting the current carrying capacity.

[0011] Third, the uneven distribution of clamping force on the busbar by traditional clamps may lead to stress concentration at the connection points, which can easily cause displacement or deformation, especially during short-circuit impacts.

[0012] Based on this, it can be seen that designing a new type of intermediate joint connector that is easy to install, has excellent conductivity, and stable insulation and mechanical properties is of great significance for improving the safety and economy of dry-type fully insulated tubular busbar systems. Utility Model Content

[0013] To solve one of the aforementioned technical problems, the present invention employs the following technical solution: a dry-type fully insulated tubular busbar intermediate joint connector, comprising two symmetrically arranged clamping seats. A semi-circular clamping cavity is provided in the middle of the inner sidewall of each clamping seat. The two semi-circular clamping cavities cooperate to form a conductor clamping space for the busbar to pass through. The conductors of the two busbars are coaxially arranged and their end faces are abutted tightly. The clamping space is used to cover and clamp the mating ends of the two busbars. The two sides of the two clamping seats extend horizontally outward to form connecting seats. The two connecting seats that abut against each other are fixed by bolt fasteners. The outer ends of the two busbars movably extend to the corresponding side outside the clamping space. A potting reinforcement structure is provided in the middle of the inner surface of each semi-circular clamping cavity.

[0014] Based on any of the above technical solutions, a further optimization is made as follows: Built-in semi-circular slots are respectively provided on the inner sidewalls of the clamping seats on both sides of the semi-circular clamping cavity; a built-in sealing ring is installed inside the built-in semi-circular slot; the inner surface of the built-in sealing ring is used to clamp onto the outer surface of the insulation layer of the busbar; the semi-circular slots located on the two clamping seats and arranged opposite to each other cooperate to achieve clamping and limiting of the built-in sealing ring.

[0015] Based on any of the above technical solutions, a further optimization is made as follows: the injection reinforcement structure includes an injection annular cavity disposed in the middle of the inner surface of the clamping seat, the inner surface of the injection annular cavity is lower than the inner surface of the semi-circular clamping cavity and an injection channel is formed between the two, and a pouring port is provided at the center of the injection annular cavity to connect it to the outside of the clamping seat.

[0016] Based on any of the above technical solutions, a further optimization is made as follows: a casting screw tube is integrally formed at the center of the outer surface of the clamping seat outside the casting port, and the central cavity of the casting screw tube is connected to the casting port.

[0017] Based on any of the above technical solutions, a further optimization is made as follows: an external thread is provided on the outer wall of the casting spiral tube, and a sealing sleeve is screwed into the external thread portion of the casting spiral tube, with the end of the sealing sleeve being sealed.

[0018] Based on any of the above technical solutions, a further optimization is made as follows: the injection annular cavity is used to receive the molten tin solution injected under high pressure through the casting solenoid and the casting port, and to cool it to form a metal fusion layer. The metal fusion layer is used to cover the outer periphery of the conductor docking ends of the two busbars and to reinforce and conduct electricity to them.

[0019] Based on any of the above technical solutions, a further optimization is made as follows: a semi-circular outer groove is provided at the end of each of the clamping seats, and two adjacent semi-circular outer grooves cooperate to form a circular groove. An outer sealing ring is engaged in the circular groove, and the outer end of the outer sealing ring is sleeved on the outer side wall of the corresponding busbar.

[0020] Based on any of the above technical solutions, a further optimization is made: when the conductor mating ends of the two busbars are in place, they are coplanar with the central cavity surface of the cast solenoid and the mating status can be observed through the central cavity.

[0021] Based on any of the above technical solutions, a further optimization is made as follows: the bolt fastener includes fastening bolts that are respectively inserted into the corresponding screw holes of the two opposing connecting seats, and the top of the fastening bolts extends above the connecting seats and is bolted and fixed with a fastening nut.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] This invention uses two symmetrically arranged clamping seats to form a conductor clamping space, and combines bolt fasteners to achieve a firm wrapping and clamping of the busbar connection ends. At the same time, it uses an injection reinforcement structure to form a metal welding layer, which significantly improves the reliability and stability of the connection between the two busbar conductors.

[0024] This utility model is equipped with an internal sealing ring, an external sealing ring, and corresponding internal semi-circular grooves and semi-circular external grooves. Through the multi-seal structure design, it can effectively prevent external dust, moisture and other impurities from entering the connection part, while preventing leakage of the internally poured tin solution, thus enhancing the sealing performance of the connection.

[0025] This invention allows for precise calibration of the docking position by observing the position of the two busbar conductors through the central cavity of the cast solenoid. Furthermore, the bolt fasteners can be partially locked in advance during installation to allow for adjustment space, thus improving the accuracy of busbar docking and the convenience of installation.

[0026] In this invention, the formation of the metal fusion layer not only enhances the mechanical strength of the connection between the two conductors, but also reduces the contact resistance and improves the conductivity. At the same time, the pouring and solidification process of the tin solution is simple and controllable, giving the connector both good mechanical and electrical properties. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or components are generally identified by similar reference numerals. In the drawings, the elements or components are not necessarily drawn to scale.

[0028] Figure 1 This is a schematic diagram of the structure of this utility model.

[0029] Figure 2 This is a three-dimensional structural diagram of the present invention after the sealing sleeve has been removed.

[0030] Figure 3 This is a top view of the structure of this utility model after the sealing sleeve has been removed.

[0031] Figure 4 This is a side view of the structure of this utility model.

[0032] Figure 5 This is a schematic diagram of the internal partial cross-sectional structure of the present invention after the metal weld layer has been removed.

[0033] Figure 6 This is a schematic diagram illustrating the internal structure of this utility model.

[0034] Figure 7 for Figure 6 A schematic diagram of the three-dimensional structure.

[0035] Figure 8 This is a three-dimensional structural diagram of the clamping base of this utility model.

[0036] In the diagram, 1. Clamping seat; 2. Semicircular clamping cavity; 3. Busbar; 4. Conductor; 5. Connecting seat; 6. Outer sealing ring; 7. Inner sealing ring; 8. Inner semicircular groove; 9. Injection annular cavity; 10. Injection port; 11. Injection solenoid; 12. Central cavity; 13. Sealing sleeve; 14. Fastening bolt; 15. Fastening nut; 16. Metal weld layer; 17. Semicircular outer groove. Detailed Implementation

[0037] The embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of the present utility model, and are therefore merely examples and should not be construed as limiting the scope of protection of the present utility model. The specific structure of the present utility model is as follows: Figures 1-8 As shown in the image.

[0038] Example 1: A dry-type fully insulated tubular busbar intermediate joint connector includes two symmetrically arranged clamping seats. A semi-circular clamping cavity is provided in the middle of the inner sidewall of each clamping seat. The two semi-circular clamping cavities cooperate to form a conductor clamping space for the busbar to pass through. The conductors of the two busbars are coaxially arranged and their end faces are abutted tightly. The clamping space is used to cover and clamp the mating ends of the two busbars. The two sides of the two clamping seats extend horizontally outward to form connecting seats. The two connecting seats that abut against each other are fixed by bolt fasteners. The outer ends of the two busbars are movably extended to the corresponding side outside the clamping space. A potting reinforcement structure is provided in the middle of the inner surface of each semi-circular clamping cavity.

[0039] When using the dry-type fully insulated tubular busbar intermediate joint connector of this utility model to connect the end conductors of two mating busbars, firstly, outer sealing rings and inner sealing rings are successively fitted onto the insulation layers of the two busbars. Then, the exposed conductors at the ends of the two busbars are connected in place. As needed, the position of the corresponding inner sealing ring is adjusted axially so that it can match the inner semi-circular groove on the clamping seat to be installed later. Then, the two clamping seats are clamped onto the mating part of the two conductors. At this time, the inner sealing rings on both sides are also clamped. After the clamping is completed, the four bolt fasteners at the four corners are pre-installed. Do not completely lock them during installation.

[0040] Keep the busbar in a state where it can be pulled axially. Observe the center cavity to see if the conductor mating surfaces of the two busbars are within the field of view of the center cavity. At the same time, observe the current position of the mating surfaces until they are in place. Then, push the outer sealing rings on the corresponding busbars toward the end face of the clamping seat until the outer sealing rings are clamped by the two semi-circular outer grooves on the clamping seat at the corresponding end. Finally, tighten all bolts and fasteners to ensure that the two connected busbars are properly aligned.

[0041] Then, by connecting one of the casting spiral tubes to the external molten tin injection line, the molten tin is injected into the casting port and gradually fills the injection annular cavity until a certain amount of molten tin flows out from the other casting spiral tube. After the injection is completed, the external molten tin injection line is removed, and then the casting spiral tubes are sealed by screwing the sealing sleeve seam. After the internal molten tin has solidified, a metal fusion layer is formed, thereby improving the reliability of the connection between the two conductors.

[0042] The conductor clamping space is formed by the semi-circular clamping cavities of two symmetrical clamping seats, which cover and tighten the mating ends of the two busbars. The clamping seats are fixed using connecting seats and bolt fasteners to ensure coaxial mating of the busbar conductors. The injection-reinforced structure further enhances the connection strength. The symmetrical structural design facilitates the positioning and clamping of the busbars during installation, improving installation convenience. The clamping space can accommodate the insertion and mating of the busbars. The cooperation between the connecting seats and bolt fasteners makes the clamping seat fixing method simple and reliable. The injection-reinforced structure provides a foundation for subsequent enhancement of connection reliability. During busbar installation, the symmetrical structure of the two clamping seats not only clamps the busbars but also, to a certain extent, calibrates the coaxiality of the busbars, reducing connection problems caused by busbar tilting. Furthermore, the clamping space design allows for some positional adjustment of the busbars during the initial installation phase, improving mating accuracy.

[0043] Based on any of the above technical solutions, a further optimization is made as follows: Built-in semi-circular slots are respectively provided on the inner sidewalls of the clamping seats on both sides of the semi-circular clamping cavity; a built-in sealing ring is installed inside the built-in semi-circular slot; the inner surface of the built-in sealing ring is used to clamp onto the outer surface of the insulation layer of the busbar; the semi-circular slots located on the two clamping seats and arranged opposite to each other cooperate to achieve clamping and limiting of the built-in sealing ring.

[0044] By providing built-in semi-circular slots on both sides of the semi-circular clamping cavity on the inner wall of the clamping seat, an installation space is provided for the built-in sealing ring. The inner surface of the built-in sealing ring is tightly fitted with the outer surface of the busbar insulation layer. At the same time, the built-in semi-circular slots on the two sides of the clamping seat work together to clamp and limit the built-in sealing ring, preventing it from shifting during use.

[0045] The design of the built-in semi-circular groove and the built-in sealing ring ensures precise positioning of the sealing ring, preventing sealing failure due to misalignment. The clamping design between the inner surface of the built-in sealing ring and the outer surface of the busbar insulation layer enhances the tightness of the seal, effectively preventing external dust, moisture, and other impurities from entering the connection area. The clamping and limiting effect of the two opposing grooves ensures the stability of the sealing ring under long-term use and vibration environments, extending the service life of the sealing structure.

[0046] The elastic deformation of the built-in sealing ring fills the gap between the busbar insulation layer and the clamping seat, preventing external impurities from entering and the leakage of the internally injected molten tin. At the same time, the limiting effect of the built-in semi-circular groove ensures that the sealing ring is always in an effective sealing position, guaranteeing the reliability of the connection.

[0047] When the built-in sealing ring is in the clamped state, in addition to its sealing function, it can also buffer the axial expansion and contraction stress of the busbar caused by temperature changes during operation through its own elasticity, reducing the mechanical impact on the conductor connection. In addition, the tight fit between the built-in semi-circular groove and the sealing ring enhances the friction between the clamp and the busbar to a certain extent, helping to limit the axial movement of the busbar, and together with the bolt fasteners, improves the overall stability of the connection.

[0048] Based on any of the above technical solutions, a further optimization is made as follows: the injection reinforcement structure includes an injection annular cavity disposed in the middle of the inner surface of the clamping seat, the inner surface of the injection annular cavity is lower than the inner surface of the semi-circular clamping cavity and an injection channel is formed between the two, and a pouring port is provided at the center of the injection annular cavity to connect it to the outside of the clamping seat.

[0049] The core of the injection reinforcement structure is the injection annular cavity, which is located in the middle of the inner surface of the clamping seat. Because the inner surface is lower than the inner surface of the semi-circular clamping cavity, a liquid injection channel is naturally formed. The pouring port serves as the interface connecting the outside and the injection annular cavity, allowing the molten tin to flow into and fill the injection annular cavity through the pouring port and the liquid injection channel, providing a spatial basis for the subsequent formation of the metal welding layer.

[0050] The annular cavity for injection is positioned in the middle of the inner surface of the clamping seat, which can precisely correspond to the docking part of the two busbar conductors, ensuring that the metal welding layer can directly act on the key connection point; the injection channel formed by the height difference of the inner surface ensures the smooth flow of the tin solution and avoids injection dead zones; the pouring port is located in the center, which facilitates the uniform filling of the entire annular cavity with solution, improving injection efficiency and quality.

[0051] The annular design of the injection cavity not only allows the metal weld layer to uniformly cover the conductor mating area, but also forms an annular interlocking structure with the clamp after solidification, enhancing the overall bonding force between the weld layer and the clamp and reducing the risk of weld layer detachment; the presence of the injection channel can expel air from the cavity during the injection process, avoiding weld layer defects caused by air bubbles, and indirectly improving connection reliability.

[0052] Based on any of the above technical solutions, a further optimization is made as follows: a casting screw tube is integrally formed at the center of the outer surface of the clamping seat outside the casting port, and the central cavity of the casting screw tube is connected to the casting port.

[0053] This creates a channel for the molten tin to enter the annular cavity from the external injection line. The external injection line can be connected to the casting spiral tube. The molten tin sequentially enters the injection channel through the central cavity and the injection port of the casting spiral tube, and finally fills the annular cavity, thus achieving a connection for the injection operation.

[0054] The one-piece molding design enhances the sealing and structural strength of the connection between the casting solenoid and the clamping seat, reducing the risk of leakage of molten tin during the pouring process. The casting solenoid is located at the center of the outer surface of the clamping seat, corresponding to the position of the pouring port, ensuring the straightness of the solution flow path and reducing flow resistance. The connection design between the central cavity and the pouring port ensures the smooth delivery of the solution during the pouring process and improves the pouring efficiency.

[0055] In addition, the spiral structure of the cast-in-place spiral tube not only facilitates connection with external injection pipelines, but also provides a threaded foundation for the installation of the sealing sleeve after injection, achieving reliable sealing of the injection channel; the one-piece molding design reduces stress concentration points on the outer surface of the clamping seat, improves the overall structural stability of the clamping seat, and adapts to the vibration environment during busbar operation; furthermore, its central cavity can serve as an observation channel to help determine the filling status of the solution in the injection annular cavity.

[0056] Based on any of the above technical solutions, a further optimization is made as follows: an external thread is provided on the outer wall of the casting spiral tube, and a sealing sleeve is screwed into the external thread portion of the casting spiral tube, with the end of the sealing sleeve being sealed.

[0057] The external thread on the outer wall of the casting spiral tube forms a threaded fit with the sealing sleeve. After the molten tin is poured, the sealing sleeve is installed on the casting spiral tube by screwing it on. The sealing structure at the end of the sealing sleeve seals the central cavity of the casting spiral tube, preventing the leakage of unsolidified molten tin and preventing external impurities from entering the casting annular cavity until the internal molten tin solidifies to form a metal weld layer.

[0058] Based on any of the above technical solutions, a further optimization is made as follows: the bolt fastener includes fastening bolts that are respectively inserted into the corresponding screw holes of the two opposing connecting seats, and the top of the fastening bolts extends above the connecting seats and is bolted and fixed with a fastening nut.

[0059] Bolt fasteners are inserted into the corresponding screw holes of two opposing connecting seats by fastening bolts. The part of the fastening bolt that extends out of the connecting seat is bolted to the fastening nut. By tightening the nut, an axial clamping force is generated, which makes the two connecting seats fit tightly together. This, in turn, drives the two clamping seats to firmly clamp the busbar connection end, ensuring the stability of the busbar conductor connection.

[0060] Example 2: Compared with Example 1, this example also includes the following technical features:

[0061] Based on any of the above technical solutions, a further optimization is made as follows: the injection annular cavity is used to receive the molten tin solution injected under high pressure through the casting solenoid and the casting port, and to cool it to form a metal fusion layer. The metal fusion layer is used to cover the outer periphery of the conductor docking ends of the two busbars and to reinforce and conduct electricity to them.

[0062] The annular cavity serves as a container for the molten tin, receiving the molten tin injected under high pressure through the casting solenoid and casting port. After the solution fills the annular cavity, it solidifies under natural cooling or ambient temperature, forming a metal fusion layer that tightly covers the outer periphery of the two busbar conductor joints. This metal fusion layer achieves mechanical reinforcement and conductive connection of the conductor joints through physical bonding and conductivity, enhancing the stability and conductivity of the two conductor joints.

[0063] The high-pressure injection method ensures that the molten tin fully fills every corner of the injection annular cavity, reducing air bubbles or voids and guaranteeing the integrity of the metal weld layer. The molten tin has good conductivity and fluidity, and the weld layer formed after cooling can closely adhere to the conductor joint, which not only enhances the mechanical connection strength but also reduces contact resistance and improves conductivity. The design of the weld layer covering the outer perimeter of the conductor joint can distribute the stress at the joint in all directions and avoid local stress concentration.

[0064] Based on any of the above technical solutions, a further optimization is made as follows: a semi-circular outer groove is provided at the end of each of the clamping seats, and two adjacent semi-circular outer grooves cooperate to form a circular groove. An outer sealing ring is engaged in the circular groove, and the outer end of the outer sealing ring is sleeved on the outer side wall of the corresponding busbar.

[0065] The semi-circular outer grooves at the ends of each clamping seat cooperate to form a circular groove when the two clamping seats are mated. The outer sealing ring is engaged in the circular groove, and its outer end is sleeved on the outer wall of the busbar. The elastic deformation of the outer sealing ring fills the gap between the end of the clamping seat and the outer wall of the busbar, thereby achieving a seal on the outside of the connection part.

[0066] Based on any of the above technical solutions, a further optimization is made: when the conductor mating ends of the two busbars are in place, they are coplanar with the central cavity surface of the cast solenoid and the mating status can be observed through the central cavity.

[0067] By setting the mating surfaces of the two busbar conductors to be coplanar with the vertical surface of the central cavity of the casting solenoid as the benchmark for proper mating, and using the central cavity of the casting solenoid as an observation channel, operators can directly observe whether the mating surfaces are in a coplanar position through this channel, thereby determining whether the conductors are properly mated, and providing an accurate positional basis for subsequent fixing and grouting operations.

[0068] Application process of dry-type fully insulated tubular busbar intermediate joint connector:

[0069] Preliminary preparation and sealing ring installation: On the insulation layer of the two busbars, install the outer sealing ring and the inner sealing ring in sequence to ensure that the sealing ring is in close contact with the insulation layer of the busbars.

[0070] Conductor connection and initial positioning: Connect the exposed conductors at the ends of the two busbars into position, and adjust the position of the built-in sealing rings axially to match the built-in semi-circular grooves on the clamps to be installed later. Then, snap the two clamps into the connection points of the two conductors, at which point the built-in sealing rings on both sides are locked in place.

[0071] Bolt pre-fixing: Insert fastening bolts into the corresponding screw holes of the connecting seats on both sides of the two clamping seats, so that the top of the bolts extends out of the connecting seats and is bolted to the fastening nuts, but not completely locked, so that the busbar can be pulled axially.

[0072] Docking position calibration: Observe the position of the docking surface of the two busbar conductors through the central cavity of the cast solenoid, and adjust the axial position of the busbars until the docking surface is coplanar with the vertical surface of the central cavity (i.e., it enters the field of view of the central cavity and the position is accurate).

[0073] External sealing ring fixing and bolt tightening: Push the external sealing ring on the busbar toward the end face of the clamping seat, so that the circular groove formed by the two semi-circular outer grooves at the end of the clamping seat clamps the external sealing ring, and the outer end of the external sealing ring is sleeved on the outer wall of the busbar. Finally, tighten all bolts and fasteners to ensure that the two busbars are properly aligned.

[0074] Tin solution pouring: Connect one of the pouring helical tubes to the external tin solution pouring pipeline, and inject tin solution into the pouring annular cavity until the solution flows out from the other pouring helical tube. After pouring is completed, remove the external pipeline and seal the pouring helical tube with a sealing sleeve.

[0075] Connection complete: After the molten tin solidifies to form a metal fusion layer, the connection between the two busbars is complete. The metal fusion layer covers the outer perimeter of the conductor mating ends, enhancing the reliability of the connection.

[0076] The above process, through the coordination of structural fit and operational steps, achieves a stable connection of the busbar intermediate joint, taking into account sealing performance, conductivity and mechanical strength.

[0077] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model. For those skilled in the art, any alternative improvements or transformations made to the implementation of this utility model fall within the protection scope of this utility model.

[0078] Any aspects of this utility model not described in detail are known to those skilled in the art.

Claims

1. A dry-type fully-insulated tubular bus mid-joint connector characterized by: The device includes two symmetrically arranged clamping seats. Each clamping seat has a semi-circular clamping cavity in the middle of its inner sidewall. The two semi-circular clamping cavities cooperate to form a conductor clamping space for the busbar to pass through. The conductors of the two busbars are coaxially arranged and their end faces are abutted tightly. The clamping space is used to cover and clamp the abutting ends of the two busbars. The two sides of the clamping seats extend horizontally outward to form connecting seats. The two connecting seats that abut against each other are fixed by bolt fasteners. The outer ends of the two busbars movably extend to the corresponding side outside the clamping space. A potting reinforcement structure is provided in the middle of the inner surface of each semi-circular clamping cavity.

2. The dry-type all-insulated tubular busway mid-joint connector of claim 1, wherein: Built-in semi-circular slots are respectively provided on the inner sidewalls of the clamping seats on both sides of the semi-circular clamping cavity. Built-in sealing rings are installed inside the built-in semi-circular slots. The inner surface of the built-in sealing rings is used to clamp the outer surface of the insulation layer of the busbar. The semi-circular slots located on the two clamping seats and arranged opposite to each other cooperate to achieve clamping and limiting of the built-in sealing rings.

3. The dry-type all-insulated tubular busway mid-joint connector of claim 2, wherein: The injection reinforcement structure includes an injection annular cavity disposed in the middle of the inner surface of the clamping seat. The inner surface of the injection annular cavity is lower than the inner surface of the semi-circular clamping cavity, and an injection channel is formed between the two. A pouring port is disposed in the center of the injection annular cavity to connect it to the outside of the clamping seat.

4. The dry-type all-insulated tubular busway mid-joint connector of claim 3, wherein: A casting screw tube is integrally formed at the center of the outer surface of the clamping seat outside the casting port, and the central cavity of the casting screw tube is connected to the casting port.

5. The dry-type all-insulated tubular busway mid-joint connector of claim 4, wherein: An external thread is provided on the outer wall of the casting spiral tube, and a sealing sleeve is screwed into the external thread of the casting spiral tube, with the end of the sealing sleeve being sealed.

6. The dry-type all-insulated tubular busway mid-joint connector of claim 5, wherein: The annular cavity is used to receive the molten tin solution injected under high pressure through the casting solenoid and the casting port, and to cool it to form a metal fusion layer. The metal fusion layer is used to cover the outer periphery of the conductor joint of the two busbars and to reinforce and conduct electricity to them.

7. The dry-type all-insulated tubular busway mid-joint connector of claim 6, wherein: A semi-circular outer groove is provided at the end of each of the clamping seats. Two adjacent semi-circular outer grooves cooperate to form a circular groove. An outer sealing ring is engaged in the circular groove. The outer end of the outer sealing ring is sleeved on the outer side wall of the corresponding busbar.

8. The dry-type all-insulated tubular busway mid-joint connector of claim 7, wherein: When the conductor mating ends of the two busbars are in place, they are coplanar with the central cavity surface of the cast solenoid and the mating status can be observed through the central cavity.

9. The dry-type all-insulated tubular busway mid-joint connector of claim 8, wherein: The bolt fasteners include fastening bolts that are respectively inserted into the corresponding screw holes of the two opposing connecting seats, and the top of the fastening bolts extends above the connecting seats and is bolted and fixed with a fastening nut.

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