A high voltage cable branch box butt joint

Abstract

The application discloses a butt joint of a high-voltage cable branch box, and relates to the technical field of power equipment.The butt joint comprises a joint body, a ring-shaped part, a stress detection assembly, an axial displacement detection assembly and an auxiliary detection assembly.Through arranging the ring-shaped cavities with liquid medium on the inner walls of the three connecting ends of the joint body, when the cable installation is forced to generate persistent static mechanical stress, the physical characteristics of the incompressible and omnidirectional flow pressure transmission of the insulating liquid medium in the cavity can be used to rapidly and uniformly disperse the local concentrated stress to each surface of the entire ring-shaped cavity, which not only effectively absorbs and buffers the destructive mechanical stress, avoids the concentrated outbreak and fatigue damage of the stress on the key connecting interface, but also enables the first elastic sheet to form a dynamic flexible seal, closely adhere to the surface of the component with slight deformation, prevent water vapor from entering, and further slow down the process of insulation deterioration.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, and in particular to a high-voltage cable branch box connection joint. Background Technology

[0002] Before installing the T-joint to the cable terminal, a series of preparatory work is required. For example, the installer needs to cut the cable according to the specific location of the electrical equipment and the direction and distance of the cable tray. However, at the installation site, the final cut length of the cable will inevitably vary. In order to make up for the length difference and the spatial contradiction between the equipment fixing point, the installer will apply forced pushing, pulling, bending and twisting to the cable so that its terminal joint can be aligned with the equipment sleeve.

[0003] However, when a cable is finally fixed under forced, unnatural conditions, the restoring force generated by the locking of elastic deformation in its internal materials is transformed into static mechanical stress that acts continuously on the connection point. This mechanical stress not only acts on the electrical connection bolts between the cable conductor and the equipment bushing, but also on the outer T-tube bushing through the bending and tensile deformation of the cable. The continuous mechanical stress will cause the T-tube bushing to undergo large or small and persistent deformation. This deformation will disturb the key interfaces between the tail of the T-tube bushing and the outer sheath of the cable, and between the end of the T-tube bushing and the connecting bushing, causing fatigue and uneven pressure at the interface, thereby destroying the integrity of the seal and providing a channel for moisture and water molecules in the environment to invade, accelerating insulation deterioration.

[0004] Furthermore, when two T-shaped sleeves, each with a cable fixed to it, are installed by plugging them end to end, the lengths of the cables will vary. If the two cables are not the same length, or if they are both too long or too short, the stress will directly damage the coaxiality and uniform contact pressure of the plugging interface, resulting in poor conductive contact, abnormal high temperature, and the risk of the connection point burning out.

[0005] Furthermore, since the cable insulation layer and the stress cone, as well as the stress cone and the inner wall of the T-shaped bushing rubber, are tightly bonded through interference fit, the tensile, compressive, or bending stresses borne by the cable body are transmitted to the stress cone without any buffer. When this mechanical stress is large and lasts for a long time, it is highly likely that the stress cone will be displaced or deformed. Any change in the geometry of the stress cone will destroy its original design intent, causing the originally smoothly dispersed electric field to re-concentrate in a localized distortion, thereby forming a localized high electric field intensity region inside the insulation system, triggering continuous partial discharge activity. The discharge will slowly and irreversibly erode the solid insulation material, forming carbonized channels, and eventually developing into complete insulation breakdown, causing single-phase grounding or phase-to-phase short circuit accidents.

[0006] To address these issues, this invention proposes a high-voltage cable branch box docking joint. Summary of the Invention

[0007] The purpose of this invention is to provide a high-voltage cable branch box docking connector to solve the technical problems mentioned in the background art.

[0008] To achieve the above objectives, the present invention provides the following technical solution: a high-voltage cable branch box mating joint, comprising: The connector body is disposed at the end of the cable, and the connector body includes a first connecting end that is sleeved with the sleeve of the branch box equipment, a second connecting end that is sleeved with the cable, and a third connecting end at the end. The annular component has multiple rings located on the inner walls of the first connecting end, the second connecting end, and the third connecting end. The annular component includes an annular plate fixedly connected to the connector body. A first elastic sheet is provided on the side of the annular plate near the inner wall, and an annular cavity is formed between the annular plate and the first elastic sheet. The annular cavity is filled with a liquid medium.

[0009] Preferably, the annular cavity of the second connecting end and the annular cavity of the third connecting end are interconnected by a pipe so that the liquid media of the two can flow into each other.

[0010] Preferably, the first elastic sheet at the second connection end is provided with a plurality of annular ribs distributed along its axis, the annular ribs being used to limit the stress cone sleeved on the cable; In the initial state before installation, the first elastic piece of the second connection end is in a contracted state. When the third connection end is sleeved with the conical piece or another connector body and squeezes the first elastic piece inside, the liquid medium in the annular cavity of the third connection end is pressed into the annular cavity of the second connection end through the pipe. The first elastic piece of the second connection end expands under pressure, causing the multiple annular ribs to radially tighten and secure the stress cone sleeved on the cable.

[0011] Preferably, a stress detection component is further provided inside the annular part of the first connection end to detect the mechanical stress borne by the joint body.

[0012] Preferably, the stress detection assembly includes a first annular tube fixedly connected to an annular plate, a first detection cavity formed inside the first annular tube, a second elastic sheet sealed and fixed at the end of the first annular tube away from the annular plate, the elastic modulus of the second elastic sheet being greater than that of the first elastic sheet, a plurality of equidistantly distributed first through slots being opened on the circumferential side of the annular plate, the first detection cavity communicating with the annular cavity through the first through slots, and a first annular strip and a second annular strip arranged at intervals being provided on the outer side of the joint body, the first annular strip corresponding to the first detection cavity; The initial radial heights of the first and second annular bars are the same.

[0013] Preferably, the annular part of the third connecting end is provided with an axis offset detection component to detect the coaxiality of the two interlocking connector bodies.

[0014] Preferably, the axis offset detection assembly includes a second annular tube fixedly connected to an annular plate at the third connecting end, a second detection cavity formed inside the second annular tube, a third elastic sheet sealed and fixed at the end of the second annular tube away from the annular plate, the elastic modulus of the third elastic sheet being greater than that of the first elastic sheet, a plurality of equally spaced second through slots being opened on the circumferential side of the annular plate, the second detection cavity communicating with the annular cavity through the second through slots, a third annular strip being provided on the outer side of the connector body, and a fourth annular strip being provided on the outer side of another connector body, the third annular strip corresponding to the second detection cavity; The initial radial heights of the third and fourth annular bars are the same.

[0015] Preferably, it further includes an auxiliary detection component, which assists the stress detection component and the axis offset detection component in performing detection, so as to detect the radial height difference between the first and second annular strips and the radial height difference between the third and fourth annular strips, respectively.

[0016] Preferably, the auxiliary detection component includes a horizontal plate, a vertical plate is fixedly connected to the middle of the horizontal plate, a detection plate is rotatably connected to the end of the vertical plate away from the horizontal plate, and laser detection components are respectively provided at both ends of the horizontal plate. The laser detection components can cooperate with the detection plate to detect whether the radial height difference between two adjacent annular strips exceeds a threshold.

[0017] Preferably, the liquid medium is a liquid medium with insulating properties.

[0018] The beneficial effects of this invention are: This invention, by setting annular cavities containing liquid media on the inner walls of the three connection ends of the connector body, allows for the rapid and uniform distribution of localized concentrated stress to all surfaces of the annular cavity when continuous static mechanical stress is generated due to cable installation. This is achieved by utilizing the incompressible and omnidirectional flow and pressure transmission properties of the insulating liquid media within the cavity. This effectively absorbs and buffers destructive mechanical stress, preventing stress concentration and fatigue failure at critical connection interfaces. Simultaneously, the first elastic sheet forms a dynamic flexible seal, adaptively and tightly conforming to the surface of components with minor deformations, preventing moisture intrusion and thus slowing down the process of insulation degradation. Furthermore, by adding stress detection components and axis offset detection components within the annular component, mechanical stress is converted into internal hydraulic pressure, driving the second or third elastic sheet with a higher elastic modulus to create a radial height difference in the outer annular strip. This allows for quick and accurate monitoring of the connector's stress and coaxiality deviation at the beginning and end of the connection, enabling timely adjustments to connectors with excessive stress or poor contact, thereby improving the conductivity reliability and system safety during multi-connector assembly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a high-voltage cable branch box docking joint according to the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of the two connector bodies of the present invention being inserted into each other.

[0021] Figure 3 This is an exploded schematic diagram of the two connector bodies and the equipment sleeve of the present invention.

[0022] Figure 4 This is a cross-sectional view of the main body of the connector of the present invention.

[0023] Figure 5 for Figure 4 A magnified view of the area along direction A.

[0024] Figure 6 for Figure 4 A magnified view of the area along direction B.

[0025] Figure 7 for Figure 4 A magnified view of the C-axis in the diagram.

[0026] Figure 8 This is a schematic diagram of the auxiliary detection component of the present invention.

[0027] The attached figures are labeled as follows: 1. Connector body; 11. First connecting end; 12. Second connecting end; 13. Third connecting end; 2. Annular component; 21. Annular plate; 22. First elastic sheet; 23. Annular cavity; 3. Stress detection assembly; 31. First annular tube; 32. First detection cavity; 33. Second elastic sheet; 34. First annular strip; 35. Second annular strip; 4. Axis offset detection assembly; 41. Second annular tube; 42. Second detection cavity; 43. Third elastic sheet; 44. Third annular strip; 45. Fourth annular strip; 5. Auxiliary detection components; 51. Horizontal plate; 52. Vertical plate; 53. Detection plate; 54. Laser detection components. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] Example 1

[0030] In the actual process of electrically connecting cables to branch boxes, installers inevitably apply forced pushing, pulling, bending, and twisting to the cables to ensure that the cable terminals are aligned with the equipment bushings. However, when the cable is finally fixed under forced and unnatural conditions, the restoring force generated by the locking of elastic deformation of its internal material is transformed into static mechanical stress that continuously acts on the connection point. This stress not only acts on the electrical connection bolts between the cable conductor and the equipment bushing, but also on the outer T-shaped bushing through the bending and tensile deformation of the cable. The continuous mechanical stress causes the T-shaped bushing to undergo large or small and persistent deformation. This deformation disturbs the critical interfaces between the tail of the T-shaped bushing and the outer sheath of the cable, and between the end of the T-shaped bushing and the connecting bushing, causing fatigue and uneven pressure at the interface, thereby compromising the integrity of the seal and providing a channel for moisture and water molecules in the environment to penetrate, accelerating insulation failure.

[0031] This embodiment was invented to solve the above problems.

[0032] Please see Figures 1 to 8 As shown, a high-voltage cable branch box docking connector according to an embodiment of the present invention includes a connector body 1 and an annular component 2. The connector body 1 is disposed at the end of the cable and includes a first connecting end 11 that is sleeved with the sleeve of the branch box equipment, a second connecting end 12 that is sleeved with the cable, and a third connecting end 13 at the end.

[0033] The annular component 2 is provided with multiple rings located on the inner walls of the first connecting end 11, the second connecting end 12, and the third connecting end 13. The annular component 2 includes an annular plate 21 fixedly connected to the connector body 1. A first elastic sheet 22 is provided on the side of the annular plate 21 near the inner wall. The annular plate 21 is fixed to the inner wall of the connector body 1 as a rigid support, while the first elastic sheet 22 faces the inside of the tube and directly contacts the outer surface of the inserted equipment sleeve. An annular cavity 23 is formed between the annular plate 21 and the first elastic sheet 22, and the annular cavity 23 is filled with a liquid medium.

[0034] The liquid medium is an insulating liquid medium. In this embodiment, the liquid medium is high-purity silicone oil.

[0035] To ensure the integrity of the joint body 1 during manufacturing and the reliability of the annular cavity 23 structure, the annular plate 21 and the joint body 1 are integrally manufactured using a combined insert secondary vulcanization molding process. In actual production, a highly rigid annular plate 21 is first prefabricated as a support skeleton, and a first elastic sheet 22 is pre-sealed and fixed at the end of the annular plate 21, forming an initial annular cavity 23 structure between the annular plate 21 and the first elastic sheet 22, thus constituting a combined insert. The first elastic sheet 22 is made of the same rubber material as the joint body 1, and is preferably in a semi-vulcanized state during the prefabrication stage of the combined insert.

[0036] Subsequently, the combined insert with the first elastic piece 22 is placed into the molding mold of the connector body 1. To prevent the annular cavity 23 inside the combined insert from collapsing under pressure or the first elastic piece 22 from deforming, the metal main core used to form the connector socket in the mold will directly pass through the center of the combined insert and fit tightly and be rigidly supported on the surface of the first elastic piece 22 facing the inside of the cavity. Under the rigid support of the inner side of the metal main core and the support of the outer skeleton of the annular plate 21, the first elastic piece 22 is firmly clamped. At this time, the insulating rubber material of the connector body 1 is injected into the mold. The high-temperature insulating rubber will flow through and completely wrap the outer area of ​​the annular plate 21 and the outer edge of the first elastic piece 22.

[0037] Under the action of cross-linking reaction, the newly injected main flexible rubber not only achieves high-strength bonding with the surface-treated rigid annular plate 21, but also undergoes co-vulcanization reaction with the edge of the first elastic sheet 22 in a semi-vulcanized state, eliminating the joint seam between the first elastic sheet 22 and the main rubber, making them completely integrated. After the joint body 1 is vulcanized and formed as a whole, completely cooled and the metal main core is extracted, the sealed annular cavity 23 is vacuumed through the micro-injection channel reserved in the non-critical stress area of ​​the joint during production. After reaching the required negative pressure state, a certain amount of insulating high-purity silicone oil is injected into the annular cavity 23 by pressure difference. Finally, the injection channel is sealed by pressure with a micro rubber plug of the same material as the joint body 1, and local heating vulcanization is used to melt and close it, thereby permanently and reliably sealing the liquid medium inside the annular cavity 23.

[0038] During use, when the connector is installed under forced conditions and generates mechanical stress, the tensile or bending stress generated by the cable will cause deformation and compression on one side of the connector body 1. During this process, the mechanical stress will directly act on the inner wall of the connector body 1. For example, when the cable length is too short, the connector body 1 mainly bears the longitudinal tensile force, and the connector body 1 tends to tilt to one side. The first elastic plate 22 of the first connection end 11 is subjected to local compression and deforms, transmitting the pressure to the liquid medium in the annular cavity 23. Utilizing the physical properties of liquid being incompressible and capable of omnidirectional flow and pressure transmission in a closed cavity, the local concentrated stress will be rapidly and evenly distributed to all surfaces of the entire annular cavity 23 through the liquid medium, effectively absorbing and buffering the destructive mechanical stress and avoiding stress concentration.

[0039] Meanwhile, with the uniform support of the internal liquid, the first elastic sheet 22 can adapt and closely fit the surface of the component that undergoes slight deformation at all times, just like a liquid gasket, forming a dynamic flexible seal to prevent moisture intrusion.

[0040] In summary, by providing annular cavities 23 with liquid media on the inner walls of the three connection ends of the connector body 1, this invention enables the rapid and uniform distribution of localized concentrated stress to all surfaces of the annular cavity 23 when continuous static mechanical stress is generated due to cable installation. This is achieved by utilizing the incompressible and omnidirectional flow pressure transmission properties of the insulating liquid media within the cavity. This not only effectively absorbs and buffers destructive mechanical stress, preventing stress concentration and fatigue damage at critical connection interfaces, but also allows the first elastic sheet 22 to form a dynamic flexible seal under the uniform support of the internal liquid. This seal adaptively and tightly conforms to the surface of components with minute deformations, preventing moisture intrusion and thus slowing down the process of insulation degradation.

[0041] Example 2

[0042] In practical use, it has been found that because the cable insulation layer and the stress cone, as well as the stress cone and the inner wall of the T-shaped bushing rubber, are tightly bonded through interference fit, the tensile, compressive, or bending stresses borne by the cable body are transmitted to the stress cone without any buffer. When this mechanical stress is large and lasts for a long time, it is highly likely that the stress cone will be displaced or deformed. Changes in the geometry of the stress cone will destroy its original design intent, causing the originally smoothly dispersed electric field to re-concentrate in a localized distortion, thereby forming a localized high electric field intensity region inside the insulation system, triggering continuous partial discharge activity. The discharge will slowly and irreversibly erode the solid insulation material, forming carbonized channels, and eventually developing into complete insulation breakdown, causing single-phase grounding or phase-to-phase short circuit accidents.

[0043] Further improvements were made based on the above embodiments.

[0044] Please see Figures 3 to 7 As shown, the annular cavity 23 of the second connecting end 12 and the annular cavity 23 of the third connecting end 13 are interconnected by a pipe so that the liquid media of the two can flow to each other.

[0045] The first elastic sheet 22 of the second connection end 12 is provided with a plurality of annular ribs distributed along its axis. The annular ribs are used to limit the stress cone sleeved on the cable. In the initial state before installation, the first elastic plate 22 of the second connecting end 12 is in a contracted state. When the third connecting end 13 is sleeved with the conical piece or another connector body 1 and squeezes the first elastic plate 22 inside it, the liquid medium in the annular cavity 23 of the third connecting end 13 is pressed into the annular cavity 23 of the second connecting end 12 through the pipeline. The first elastic plate 22 of the second connecting end 12 expands under pressure, which drives multiple annular ribs to radially tighten and secure the stress cone sleeved on the cable.

[0046] It should be added that the elastic modulus of the first elastic piece 22 of the second connecting end 12 is greater than that of the first elastic piece 22 of the third connecting end 13. In the initial state, the first elastic piece 22 of the third connecting end 13 is in an expanded state, while the first elastic piece 22 of the second connecting end 12 is in a contracted state. "Contraction" means that the first elastic piece 22 is in a radially outward state in the initial state, that is, the liquid pressure in the annular cavity 23 is insufficient to cause the first elastic piece 22 to expand towards the cable. When the cable is inserted from the third connecting end 13, it will not directly contact the first elastic piece 22, avoiding hard friction and resistance in the initial stage of installation, and also preventing the contact surface of the annular rib from tilting during the insertion process. This is because the cross-section of the annular rib is rectangular. If the original rectangular cross-section becomes a parallelogram due to the tilting of the contact surface during the insertion process of the cable, it will instead generate a lateral thrust on the cable.

[0047] When the third connecting end 13 is sleeved with an external component (such as a tapered piece or another connector body 1) and is compressed, the annular cavity 23 and the first elastic plate 22 on this side are compressed. Part of the liquid medium of the third connecting end 13 is pumped into the annular cavity 23 of the second connecting end 12 through the pipeline. At this time, the "expansion" of the elastic plate of the second connecting end 12 is actually a radial bulge towards the inside of the cavity (i.e. towards the central axis of the cable). At this time, the multiple annular ribs on the first elastic plate 22 will fix the insulating sleeve (with stress cones inside) on the outer surface of the cable, improving the problem of axial displacement under longitudinal tensile force and bending stress.

[0048] In summary, this invention establishes fluid communication between the second connecting end 12 and the third connecting end 13 through an annular cavity 23, and utilizes the difference in elastic modulus of the first elastic sheet 22 at different connecting ends to keep the second connecting end 12 in a contracted state during the initial installation stage, thus avoiding hard frictional resistance and the overturning and tilting of the annular ribs when the cable is inserted. After the connection is completed and subjected to compression, the liquid medium is automatically pumped into the second connecting end 12 to cause it to expand radially. The annular ribs stabilize and limit the insulating sleeve and the internal stress cone, thus improving the problem that the stress cone is prone to axial displacement or deformation under longitudinal tensile and bending stress.

[0049] Example 3

[0050] When two T-shaped sleeves with cables fixed to them are installed end to end, the lengths of the cables will vary. When the lengths of the two cables are inconsistent, or both are too long or too short, the stress will directly damage the coaxiality and uniform contact pressure of the insertion interface, resulting in poor conductive contact. However, the existing technology cannot detect the coaxiality of the two interlocking connector bodies 1, nor can it know the magnitude of the stress borne by the connector body 1.

[0051] Further improvements were made based on the above embodiments.

[0052] Please see Figures 3 to 8 As shown, a stress detection component 3 is also provided inside the annular part 2 of the first connecting end 11 to detect the mechanical stress borne by the joint body 1.

[0053] The stress detection assembly 3 includes a first annular tube 31 fixedly connected to the annular plate 21. A first detection cavity 32 is formed inside the first annular tube 31. A second elastic sheet 33 is sealed and fixed at the end of the first annular tube 31 away from the annular plate 21. The elastic modulus of the second elastic sheet 33 is greater than that of the first elastic sheet 22. A plurality of equidistant first through slots are opened on the circumferential side of the annular plate 21. The first detection cavity 32 is connected to the annular cavity 23 through the first through slots. A first annular strip 34 and a second annular strip 35 are arranged at intervals on the outer side of the connector body 1. The first annular strip 34 corresponds to the first detection cavity 32. The initial radial heights of the first annular bar 34 and the second annular bar 35 are the same.

[0054] An axis offset detection component 4 is provided inside the annular part 2 of the third connecting end 13 to detect the coaxiality of the two interlocking connector bodies 1.

[0055] The axis offset detection assembly 4 includes a second annular tube 41 fixedly connected to the annular plate 21 of the third connecting end 13. A second detection cavity 42 is formed inside the second annular tube 41. A third elastic sheet 43 is sealed and fixed at the end of the second annular tube 41 away from the annular plate 21. The elastic modulus of the third elastic sheet 43 is greater than that of the first elastic sheet 22. A larger elastic modulus means that a larger liquid pressure is required to make the third elastic sheet 43 produce elastic deformation. A plurality of equally spaced second through grooves are opened on the circumferential side of the annular plate 21. The second detection cavity 42 is connected to the annular cavity 23 through the second through grooves. A third annular strip 44 is provided on the outer side of the connector body 1. A fourth annular strip 45 is provided on the outer side of the other connector body 1. The third annular strip 44 corresponds to the second detection cavity 42. The initial radial heights of the third annular bar 44 and the fourth annular bar 45 are the same.

[0056] It should be added that, for the stress detection component 3 and axis offset detection component 4 added in this embodiment, during the prefabrication stage of the combined insert, a through groove for communication and an outwardly extending annular tube are integrally formed on the circumferential side of the rigid annular plate 21, and a second elastic sheet 33 or a third elastic sheet 43 with a higher elastic modulus is pre-sealed and fixed at the end of the corresponding annular tube, thereby forming a complex combined insert containing a detection cavity structure. When the main body rubber is injected into the molding mold, the insulating rubber will seamlessly cover the outside of the annular tube and undergo a co-vulcanization reaction with the second and third elastic sheets 43, which are in a semi-vulcanized state at the edge, to completely eliminate the gaps at the bonding interface.

[0057] This embodiment also includes an auxiliary detection component 5, which assists the stress detection component 3 and the axis offset detection component 4 in performing detection, so as to detect the radial height difference between the first annular strip 34 and the second annular strip 35 and the radial height difference between the third annular strip 44 and the fourth annular strip 45, respectively.

[0058] The auxiliary detection component 5 includes a horizontal plate 51, a vertical plate 52 fixedly connected to the middle of the horizontal plate 51, a detection plate 53 rotatably connected to the end of the vertical plate 52 away from the horizontal plate 51, and laser detection components 54 respectively provided at both ends of the horizontal plate 51. The laser detection components 54 can cooperate with the detection plate 53 to detect whether the radial height difference between two adjacent annular bars exceeds the threshold.

[0059] During use, after the connector body 1 connected to the branch box equipment sleeve is installed, if the cable is too long or too short, causing the connector body 1 to bear longitudinal tensile force or bending stress, the annular cavity 23 of the first connection end 11 will experience a phenomenon of compression on one side and release on the other side. When the mechanical stress is small, the small deformation of the annular cavity 23 will only cause the first elastic plate 22 to deform, thereby compensating for the gap that may be formed at the connection end. However, when the mechanical stress is large, the pressure in the first detection cavity 32 increases and causes the second elastic plate 33 to expand radially. The deformed second elastic plate 33 will directly push the first annular strip 34 on the outside of the connector body 1, causing its radial height to change. At this time, the staff can check whether there is a significant radial height difference between the first annular strip 34 and the second annular strip 35 by visual observation or touch. If there is, it means that the current cable and connector body 1 are bearing a large mechanical stress, and it should be dealt with immediately.

[0060] In this embodiment, a method different from manual inspection is also provided. Instead, the staff uses the handheld auxiliary inspection component 5 to attach the inspection plate 53 to the adjacent first annular strip 34 and second annular strip 35. When the first annular strip 34 bulges due to pressure, the originally horizontal inspection plate 53 will tilt. The laser inspection components 54 at both ends of the horizontal plate 51 accurately obtain the radial height difference between adjacent annular strips by scanning and calculating the deflection state of the inspection plate 53.

[0061] Furthermore, after the two connector bodies 1 are installed together, the coaxiality of the two connector bodies 1 needs to be tested. The testing process and principle are the same as above. The difference is that the third annular strip 44 and the fourth annular strip 45 are located on different connector bodies 1.

[0062] In summary, this invention, by adding a stress detection component 3 and an axis offset detection component 4 inside the annular component 2, utilizes mechanical stress to convert it into internal hydraulic pressure, driving a second elastic plate 33 or a third elastic plate 43 with a high elastic modulus to create a radial height difference in the outer annular strip. Combined with the measurement of the auxiliary detection component 5, installation and maintenance personnel can quickly and accurately grasp the stress condition of the joint and the coaxiality deviation of the first and last insertions without damaging the internal structure or interrupting operation. This provides a reliable basis for on-site installation quality assessment and subsequent hidden danger investigation, and enables timely adjustment and intervention for joints with excessive stress or poor contact, thereby improving the conductivity reliability and system safety when multiple joints are combined for installation.

[0063] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high voltage cable branch box butt joint, characterized in that, include: The connector body (1) is located at the end of the cable. The connector body (1) includes a first connecting end (11) that is sleeved with the sleeve of the branch box equipment, a second connecting end (12) that is sleeved with the cable, and a third connecting end (13) at the end. An annular component (2) is provided with multiple components located on the inner walls of the first connecting end (11), the second connecting end (12), and the third connecting end (13). The annular component (2) includes an annular plate (21) fixedly connected to the connector body (1). A first elastic sheet (22) is provided on the side of the annular plate (21) near the inner wall, and an annular cavity (23) is formed between the annular plate (21) and the first elastic sheet (22). The annular cavity (23) is filled with a liquid medium. The annular cavity (23) of the second connecting end (12) and the annular cavity (23) of the third connecting end (13) are connected to each other through a pipe so that the liquid media of the two can flow to each other; The first elastic sheet (22) of the second connection end (12) is provided with a plurality of annular ribs distributed along its axis, the annular ribs being used to limit the stress cone sleeved on the cable; In the initial state before installation, the first elastic plate (22) of the second connecting end (12) is in a contracted state. When the third connecting end (13) is sleeved with the conical piece or another connector body (1) and squeezes the first elastic plate (22) inside it, the liquid medium in the annular cavity (23) of the third connecting end (13) is pressed into the annular cavity (23) of the second connecting end (12) through the pipeline. The first elastic plate (22) of the second connecting end (12) expands under pressure, which drives the multiple annular ribs to radially tighten and fasten the stress cone sleeved on the cable.

2. The high-voltage cable branch box butt joint according to claim 1, characterized in that, The first connecting end (11) is further provided with a stress detection component (3) in the annular part (2) to detect the mechanical stress borne by the joint body (1).

3. A high-voltage cable branch box butt joint according to claim 2, characterized in that, The stress detection assembly (3) includes a first annular tube (31) fixedly connected to an annular plate (21). A first detection cavity (32) is formed inside the first annular tube (31). A second elastic sheet (33) is sealed and fixed at one end of the first annular tube (31) away from the annular plate (21). The elastic modulus of the second elastic sheet (33) is greater than that of the first elastic sheet (22). A plurality of equidistant first through slots are opened on the circumferential side of the annular plate (21). The first detection cavity (32) is connected to the annular cavity (23) through the first through slots. A first annular strip (34) and a second annular strip (35) are provided on the outer side of the connector body (1) at intervals. The first annular strip (34) corresponds to the first detection cavity (32). The initial radial heights of the first annular bar (34) and the second annular bar (35) are the same.

4. A high-voltage cable branch box butt joint according to claim 3, characterized in that, An axis offset detection component (4) is provided inside the annular part (2) of the third connection end (13) to detect the coaxiality of the two interlocking connector bodies (1).

5. A high-voltage cable branch box mating joint according to claim 4, characterized in that, The axis offset detection assembly (4) includes a second annular tube (41) fixedly connected to the annular plate (21) of the third connecting end (13). A second detection cavity (42) is formed inside the second annular tube (41). A third elastic sheet (43) is sealed and fixed at one end of the second annular tube (41) away from the annular plate (21). The elastic modulus of the third elastic sheet (43) is greater than that of the first elastic sheet (22). A plurality of equally spaced second through slots are opened on the circumferential side of the annular plate (21). The second detection cavity (42) is connected to the annular cavity (23) through the second through slots. A third annular strip (44) is provided on the outer side of the connector body (1). A fourth annular strip (45) is provided on the outer side of another connector body (1). The third annular strip (44) corresponds to the second detection cavity (42). The initial radial heights of the third annular bar (44) and the fourth annular bar (45) are the same.

6. A high-voltage cable branch box mating joint according to claim 5, characterized in that, It also includes an auxiliary detection component (5), which is used to assist the stress detection component (3) and the axis offset detection component (4) in performing detection, so as to detect the radial height difference between the first annular strip (34) and the second annular strip (35) and the radial height difference between the third annular strip (44) and the fourth annular strip (45), respectively.

7. A high-voltage cable branch box butt joint according to claim 6, characterized in that, The auxiliary detection component (5) includes a horizontal plate (51), a vertical plate (52) is fixedly connected to the middle of the horizontal plate (51), and a detection plate (53) is rotatably connected to the end of the vertical plate (52) away from the horizontal plate (51). Laser detection components (54) are respectively provided at both ends of the horizontal plate (51). The laser detection components (54) can cooperate with the detection plate (53) to detect whether the radial height difference between two adjacent annular bars exceeds the threshold.

8. A high-voltage cable branch box butt joint according to claim 1, characterized in that, The liquid medium is a liquid medium with insulating properties.

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