A quick wiring type cable branch box

Abstract

This application relates to the field of cable branch box manufacturing technology, specifically disclosing a quick-connect cable branch box, which includes a box body, a connecting assembly, and a quick-connect protection assembly. A mating sleeve is provided inside the box body. The connecting assembly includes a plug-in head and conductive terminals. The quick-connect protection assembly includes an inner support member and a cleaning member. The inner support member includes an inner support tube and a liquid reservoir. The inner support tube is installed inside the plug-in head and is used for radial expansion support of the plug-in head. The liquid reservoir is installed on the inner support tube and contains pre-stored insulating medium. The cleaning member is used to adsorb and clean the surface of the cable's conductive terminals when they are inserted. The cleaning member and the inner support member can be torn apart sequentially by a pulling operation, simultaneously releasing the insulating medium to fill the gap between the cable and the plug-in head. This application has the effect of improving the stability of conductive connections and long-term operational reliability.

Description

Technical Field

[0001] This application relates to the field of cable branch box manufacturing technology, and in particular to a quick-connect cable branch box. Background Technology

[0002] Currently, with the continuous development of urban power distribution networks, industrial plant power supply systems, and building electrical engineering, the demand for branch connections of cable lines is increasing. Especially in scenarios such as urban underground integrated pipe corridors, temporary power supply construction areas, emergency repair power distribution networks, and modular equipment installations, cable branch boxes are widely used to achieve multi-path power distribution within limited space and time. These devices not only undertake the functions of conducting and distributing power between main cables and branch cables, but also must possess reliable insulation, protection, dustproof, moisture-proof, and heat dissipation capabilities to ensure the long-term stable operation of the power system in complex outdoor or semi-outdoor environments. In these application scenarios, the construction space is usually very narrow, and the operation time window is strictly limited. This requires that the wiring operation of cable branch boxes be extremely fast and convenient, while ensuring a high degree of reliability in connection quality. Any increase in contact resistance due to poor connection may lead to serious faults such as overheating, arcing, or even fire.

[0003] Existing technologies for achieving rapid cable connections mainly fall into two categories. The first is the traditional bolt-press branch box, which uses terminals on copper busbars. Operators insert the stripped cable conductor into the terminal hole and then tighten the bolt with a torque wrench to press the conductor onto the terminal. The second is the quick-connect technology developed in recent years. This typically includes an insulating shell and a conductive connection assembly inside. This assembly has multiple insertion holes, each equipped with a spring-loaded or crown-spring-type elastic conductive contact. After the cable end has its insulation stripped and the conductive pin crimped, the pin is simply inserted into the insertion hole, and the elastic contact clamps it with radial clamping force, simultaneously completing the mechanical connection and electrical conduction. For ease of operation, this type of quick-connect structure is often equipped with locking clips or threaded locking sleeves to quickly prevent axial disengagement. This design significantly improves wiring speed and reduces reliance on operator skills and tools.

[0004] While quick-connect technology solves the problem of ease of operation, in the emergency repair of power distribution networks, construction often needs to be completed within a limited time. Most existing quick-connect structures lock directly after conductor insertion. During the clamping process, if foreign objects are trapped between the conductive interfaces, they can easily be pressed into the conductive contact area under increasing clamping force, leading to increased local contact resistance and potential localized overheating. This is especially problematic in humid or outdoor environments, where it is extremely difficult to ensure that the main components involved in the installation remain clean throughout the entire process. Therefore, how to ensure quick-connect efficiency while actively removing foreign objects from the conductive contact area during clamping and preventing them from remaining trapped inside the conductive interface, thereby improving the stability of the conductive connection and long-term operational reliability, has become a pressing technical problem in the current cable distribution box field. Summary of the Invention

[0005] This application provides a quick-connect cable branch box, which enables quick cable plug-in installation while pre-cleaning, isolating foreign objects, and sealing and filling the plug-in area, thereby improving the reliability and installation efficiency of cable terminal connections.

[0006] This application provides a quick-connection type cable branch box, which adopts the following technical solution: A quick-connect cable branch box, comprising: The enclosure contains a connecting sleeve for cable connection. A connection assembly is installed inside the housing. The connection assembly includes a plug head and conductive terminals. The plug head is provided with a front connector, a rear connector, and a lower connector. The front connector is used to connect and communicate with the mating sleeve. The lower connector is used to connect with a cable on which the conductive terminals are installed. The conductive terminals are fixedly connected to the cable core and are connected and communicate with the mating sleeve. A quick-connect protective assembly is installed inside the plug head. The quick-connect protective assembly includes an inner support and a cleaning component. The inner support includes an inner support tube and a liquid reservoir. The inner support tube is removably inserted into the inner cavity of the lower plug head and is used to radially expand and support the lower plug head. The liquid reservoir is fixedly sleeved on the inner support tube and contains an insulating medium. The cleaning component includes a mounting cylinder and a guide sleeve. The mounting cylinder is fixedly covered to the end of the lower connector, and the guide sleeve is disposed inside the mounting cylinder. The guide sleeve is used to adsorb and clean the surface of the conductive terminal of the cable when it is inserted. The cleaning component and the inner support component are configured to be torn apart sequentially by a traction operation after the conductive terminal is plugged in, so that the lower connector shrinks to cover the cable and simultaneously releases the insulating medium to fill the gap between the cable and the lower connector.

[0007] By adopting the above technical solution, a quick-connect protective component is installed inside the plug head, and the lower plug head is pre-expanded and supported by the inner support component. This allows the lower plug head to maintain a large insertion space during the insertion of the conductive terminal, thereby reducing insertion resistance, improving the efficiency of rapid cable connection, and effectively preventing damage to the inner wall of the plug head during installation, which would affect the insulation and shielding performance of the plug head. At the same time, by setting a guide sleeve to pre-clean the surface of the conductive terminal, dust and other small foreign objects on the surface can be actively adsorbed during the insertion of the conductive terminal, preventing foreign objects from directly entering the conductive contact area, thereby reducing the risk of increased contact resistance at the conductive interface. Furthermore, after the conductive terminal is inserted, the cleaning component and the inner support component are torn off in sequence by a traction operation. After the lower plug head loses its support, it radially shrinks to cover the outer periphery of the cable, and the insulating medium is released simultaneously to fill the connection gap. This not only improves the sealing, insulation, and moisture-proof performance of the connection area, but also reduces air residue and moisture intrusion, thereby improving the stability of the conductive connection and the reliability of long-term operation.

[0008] Optionally, the inner support tube is configured as a thin-walled conical tube, and a continuous spiral first guiding groove is formed on the inner wall of the inner support tube. A traction part is fixed at one end of the inner support tube. When the traction part is pulled, the inner support tube can be torn along the first guiding groove and transformed into a strip structure.

[0009] By adopting the above technical solution, and setting the inner support tube as a thin-walled conical tube, the radial expansion effect of the inner support tube on the lower connector is gradually distributed along the axial direction. Since the lower connector is a high-voltage insulating component made of EPDM material, its overall wall thickness is large and its structural rigidity is high. After being in an expanded state for a long time, the elastic rebound ability of its thick-walled area is relatively limited. Therefore, if a uniform cylindrical inner support structure is used, it is easy to cause the overall expansion of the lower connector to be uniform, and then it is difficult to form sufficient radial clamping force on the cable after the inner support is removed. However, by adopting a conical structure, the thin-walled area near the end of the lower connector can obtain a larger radial expansion. After the inner support tube is removed, the thin-walled area can preferentially shrink inward due to its high elastic recovery ability, thereby forming a more stable radial covering and clamping effect on the outer periphery of the cable, so as to improve the sealing stability and mechanical fixation reliability of the connection area.

[0010] Meanwhile, by setting a continuous spiral-shaped first induction groove on the inner wall of the inner support tube, the inner support tube can be continuously torn along a preset spiral trajectory after being subjected to traction force, thereby avoiding the thick-walled insulation structure from forming a local clamp on the inner support tube and reducing the risk of jamming during the dismantling process; in addition, after being torn, the inner support tube transforms into a strip structure, which can significantly reduce the contact area and frictional resistance between it and the lower connector, thereby facilitating rapid removal and improving the efficiency of rapid wiring operations on site.

[0011] Optionally, a continuous spiral second guiding groove is formed on the inner outer peripheral wall of the liquid storage bladder. The pitch and direction of the first guiding groove and the second guiding groove are the same. The inner outer peripheral wall of the liquid storage bladder is fixedly connected to the outer peripheral wall of the inner support tube. The liquid storage bladder is filled with silicone grease.

[0012] By adopting the above technical solution, and by setting a second induction groove on the liquid storage bladder with the same rotation direction and pitch as the first induction groove, the liquid storage bladder can be continuously torn along the same trajectory during the tearing process of the inner support tube, thereby ensuring that the insulating medium can be released evenly and avoiding local residues. At the same time, by using silicone grease to fill the connection gap, air and moisture can be effectively isolated from entering the conductive connection area, reducing the risk of oxidation and moisture absorption at the conductive interface, and a stable insulating protective layer can be formed in the conductive contact area, thereby improving the long-term conductivity stability and environmental resistance of the cable connection part.

[0013] Optionally, the mounting cylinder is inserted into the inner support tube, and one end of the mounting cylinder is fixedly provided with an annular extension. The mounting cylinder is fixedly covered to the end of the lower connector through the extension. The outer diameter of the mounting cylinder is smaller than the inner diameter of the inner support tube, and a buffer gap is formed between the mounting cylinder and the inner support tube to accommodate the traction part.

[0014] By adopting the above technical solution, the mounting cylinder is inserted into the inner support tube and fixedly covered by the extension at the end of the lower connector, thus providing a stable mounting base for the guide sleeve. This allows the guide sleeve to be stably maintained at the entrance position of the lower connector, ensuring that the conductive terminal can always be guided and cleaned through the guide sleeve during insertion, thereby improving the stability and reliability of the cleaning process. At the same time, after installation, the mounting cylinder can also seal and isolate the inner support component located inside the lower connector, keeping the entire lower connector cavity relatively closed, thereby reducing the possibility of external dust, moisture, and foreign objects entering the interior, which is conducive to maintaining the cleanliness of the inner support component and the liquid storage bladder.

[0015] Furthermore, since the mounting cylinder is located inside the inner support tube and forms a buffer gap between them, it can also provide space for the traction unit. Therefore, before the cleaning component is removed, the operator cannot directly contact and pull the traction unit, thereby preventing the inner support component from being removed in advance. This prevents the lower connector from losing its radial support function before the conductive terminal is fully inserted, thereby reducing the risk of connection failure or insertion misalignment due to misoperation and improving the operational reliability and process sequence stability of the overall connection process.

[0016] Optionally, the guide sleeve is disposed at one end of the mounting cylinder where the extension is provided. The inner wall of the guide sleeve is coated with a layer of high-cohesion, low-exudation silicone micro-adhesion layer. The guide sleeve is respectively provided with a first cleaning section and a second cleaning section. The first cleaning section is shaped like a flared mouth, and the open end of the first cleaning section is fixedly connected to the inner wall of the mounting cylinder. The second cleaning section is disposed on the constricted end of the first cleaning section. The second cleaning section is provided with a cavity that matches the outer contour of the conductive terminal, and the cavity is smaller than the outer contour of the conductive terminal. An exhaust hole is provided through the center of the second cleaning section.

[0017] By adopting the above technical solution, a high-cohesion, low-exudation silicone micro-adhesion layer is coated on the inner wall of the guide sleeve, enabling the guide sleeve to adsorb and clean foreign objects such as dust and metal particles adhering to its surface during the insertion of the conductive terminal. At the same time, due to the high cohesion and low exudation characteristics of this micro-adhesion layer, it is not easy for colloidal transfer to contaminate the conductive interface. Furthermore, by setting a funnel-shaped first cleaning section, the conductive terminal can be guided and initially scraped and cleaned, while the second cleaning section uses a cavity smaller than the outer contour of the conductive terminal to press and clean the conductive terminal, thereby further improving the surface foreign object removal effect. In addition, by setting an exhaust hole, internal air can be released during the insertion of the conductive terminal, avoiding the formation of air pressure obstruction and improving the smoothness of insertion.

[0018] Optionally, the guide sleeve is provided with a first guide line and a second guide line. Both the first and second guide lines are set as discontinuous cuts that do not penetrate the guide sleeve. A long strip-shaped weakening guide area is formed between the first and second guide lines. One end of the weakening guide area is provided with a connecting part, and a traction rope is fixedly connected to the connecting part. The outer peripheral wall of the mounting cylinder is provided with a first guide line and a second guide line. Both the first and second guide lines are discontinuous cuts that completely penetrate the wall of the mounting cylinder. A long strip-shaped weakening guide area is formed between the first and second guide lines. One end of the weakening guide area is provided with a tearing part. The tearing part is fixedly connected to the end of the weakening guide area away from the connecting part, so that when the traction rope is pulled, the guide sleeve and the mounting cylinder can be torn sequentially and directionally.

[0019] By adopting the above technical solution, and by setting corresponding induction lines and guide lines on the guide sleeve and the mounting cylinder respectively, the guide sleeve and the mounting cylinder can be directionally torn along a predetermined path when subjected to traction, thereby avoiding random breakage that could lead to structural residue or dismantling failure, and improving dismantling reliability. At the same time, by setting weakened induction zones and weakened guide zones, the tearing initiation resistance can be reduced, allowing operators to complete the dismantling action with less pulling force. Furthermore, by using a traction rope to achieve sequential tearing of the guide sleeve and the mounting cylinder, it can be ensured that the clean structure is dismantled only after the conductive terminals have been inserted, thus ensuring both the cleaning effect during the insertion process and preventing long-term residue of clean parts from affecting the stability of the conductive connection.

[0020] Optionally, the mounting cylinder has a first clearance groove at one end away from the extension, and a second clearance groove is provided on the extension. One end of the weakening guide area is connected to the first clearance groove, and the other end of the weakening guide area is connected to the second clearance groove. The end of the traction rope away from the connecting part extends out of the mounting cylinder through the first clearance groove and the second clearance groove.

[0021] By adopting the above technical solution and setting the first and second clearance grooves, a stable guiding path can be provided for the traction rope, thereby avoiding bending, jamming or friction entanglement of the traction rope inside the installation cylinder and improving the stability of the traction action; at the same time, the weakened guide area is connected to the first and second clearance grooves respectively, which is conducive to forming a continuous tear initiation path, thereby improving the controllability and integrity of the directional tear of the installation cylinder.

[0022] Optionally, a sealing film is fixed on the end face of the mounting cylinder where the extension is provided, and the sealing film is used to form a sealed cavity inside the guide sleeve.

[0023] By adopting the above technical solution, a sealing film is set on the end face of the mounting cylinder to form a closed chamber inside the guide sleeve. This effectively reduces the entry of external dust, moisture and impurities into the guide sleeve, thereby maintaining the cleanliness of the micro-adhesion layer on the inner wall of the guide sleeve and improving its cleaning effect on the conductive terminals. At the same time, the closed structure can also reduce the risk of external environment contamination of the internal structure during transportation and storage, thereby improving the reliability of the device in field use.

[0024] Optionally, a buffer strip is also provided on the inner wall of the inner support tube. The buffer strip is made of silicone rubber and is wound into a conical shape along the spiral trajectory of the first induction groove.

[0025] By adopting the above technical solution, a silicone rubber buffer strip wound along the spiral trajectory of the first induction groove is set on the inner wall of the inner support tube. This allows the conductive terminal to form flexible contact with the elastic silicone rubber buffer strip during insertion and positioning, thereby effectively reducing the rigid friction and local impact force between the conductive terminal and the inner support tube. This prevents scratches, wear, or coating damage to the conductive terminal surface, improving the structural integrity and electrical contact reliability of the conductive terminal. At the same time, during the outward withdrawal of the inner support tube, the buffer strip maintains close contact with the conductive terminal and the outer periphery of the cable, allowing for accompanying wiping and cleaning of the upper surface of the cable and the connection transition area. This removes residual dust, metal debris, or moisture contaminants, further improving the cleanliness of the conductive connection area, reducing contact resistance fluctuations, and improving long-term conductivity stability and environmental adaptability.

[0026] In summary, this application includes at least one of the following beneficial technical effects: 1. By incorporating a quick-connect protective component inside the plug head and pre-expanding the lower plug head with an internal support, a larger insertion space is maintained during the insertion of the conductive terminal, thereby reducing insertion resistance, improving the efficiency of rapid cable connection, and effectively preventing damage to the inner wall of the plug head during installation, which could affect the insulation and shielding performance of the plug head. Simultaneously, a guide sleeve pre-cleans the surface of the conductive terminal, actively adsorbing dust and other small foreign objects during insertion, preventing them from directly entering the conductive contact area and reducing the risk of increased contact resistance at the conductive interface. Furthermore, a traction operation sequentially tears and removes the cleaning component and internal support, simultaneously releasing the insulating medium to fill the connection gap. This not only improves the sealing, insulation, and moisture-proof performance of the connection area but also reduces residual air and moisture intrusion, thereby enhancing the stability of the conductive connection and long-term operational reliability. 2. Since the mounting cylinder is located inside the inner support tube and forms a buffer gap between them, it can also provide space for the traction unit. Therefore, before the cleaning parts are removed, the operator cannot directly contact and pull the traction unit, thereby avoiding the premature removal of the inner support parts and preventing the lower connector from losing its radial support function before the conductive terminals are fully inserted. This reduces the risk of connection failure or insertion misalignment due to misoperation and improves the operational reliability and process sequence stability of the overall connection process. 3. By setting a silicone rubber buffer strip wound along the spiral trajectory of the first induction groove on the inner wall of the inner support tube, the conductive terminal can form a flexible contact with the elastic silicone rubber buffer strip during the insertion and positioning process. This effectively reduces the rigid friction and local impact force between the conductive terminal and the inner support tube, avoids scratches, wear or coating damage on the surface of the conductive terminal, and improves the structural integrity and electrical contact reliability of the conductive terminal. At the same time, during the outward withdrawal of the inner support tube, the buffer strip maintains close contact with the conductive terminal and the outer periphery of the cable, which can perform accompanying wiping and cleaning of the upper surface of the cable and the connection transition area, thereby removing residual dust, metal debris or moisture contaminants, further improving the cleanliness of the conductive connection area, reducing contact resistance fluctuations, and improving long-term conductivity stability and environmental adaptability. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the cable branch box in the embodiments of this application.

[0028] Figure 2 This is a half-sectional structural diagram of the plug-in head in the embodiments of this application.

[0029] Figure 3 This is an exploded view of the quick-connect protective assembly in the embodiments of this application.

[0030] Reference numerals: 1. Housing; 11. Connecting sleeve; 2. Connecting assembly; 21. Plug-in head; 211. Front connector; 212. Rear connector; 213. Lower connector; 22. Conductive terminal; 23. Stress cone; 3. Quick-connect protective assembly; 31. Inner support component; 311. Inner support tube; 3111. First guide groove; 3112. Traction part; 312. Liquid storage bladder; 3121. Second guide groove; 32. Cleaning component; 321. Mounting cylinder; 3211. Extension; 3212. First guide line; 3213. Second guide line; 3214. Tear-off part; 3215. First clearance groove; 3216. Second clearance groove; 322. Guide sleeve; 3221. First cleaning section; 3222. Second cleaning section; 3223. First guide line; 3224. Second guide line; 3225. Connecting part; 323. Weakened guide area; 324. Traction rope; 325. Weakened guide area; 326. Sealing film; 33. Buffer strip. Detailed Implementation

[0031] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail below.

[0032] This application discloses a quick-connect cable branch box.

[0033] Reference Figure 1 and Figure 2 A quick-connect cable branch box includes a box body 1, a connecting component 2, and a quick-connect protection component 3. The connecting component 2 is installed inside the box body 1, and the quick-connect protection component 3 is installed on the connecting component 2. The connecting component 2 is used to realize the quick connection of the cable to the cable branch box, and the quick-connect protection component 3 is used to provide isolation protection for the outer periphery of the cable conductor when the cable conductor is installed into the inner cavity of the plug 21, so as to avoid the inner wall of the plug 21 being scratched and to keep the inner cavity clean.

[0034] Reference Figure 1 In this embodiment, the enclosure 1 is made of stainless steel plate. The enclosure 1 has doors on both the front and rear sides, forming a two-way opening structure, which facilitates bidirectional entry and exit for construction and maintenance personnel. The top of the enclosure 1 has ventilation holes and a metal heat sink (not shown in the attached drawings) is installed. The lower side of the enclosure 1 has ventilation windows, which create an air convection channel inside the enclosure to ensure good heat dissipation.

[0035] The enclosure 1 is equipped with a partition made of stainless steel, which is horizontally fixed to the middle of the inner wall of enclosure 1. The partition divides the interior space of enclosure 1 into an upper busbar compartment and a lower cable compartment. The busbar compartment has a vertically fixed mounting plate with at least three mating sleeves 11 evenly spaced horizontally along its sides, with a spacing of 180mm between adjacent sleeves. A stainless steel cable joint bracket is located at the top of the busbar compartment, connecting to and providing stable support for the sleeve fixing plate. All live parts in the busbar compartment are rigorously insulated with silicone rubber to ensure fully insulated operation.

[0036] The cable compartment is located below the busbar compartment. A cable inlet is provided on the enclosure 1, serving as the main channel for cable entry and exit. The cable compartment contains cable fixing components, including cable supports and clamps. The upper end of the cable is inserted into the plug-in head 21, and the cable body is clamped and fixed by the cable supports and clamps, effectively preventing the cable from sagging due to gravity. The bottom of the cable compartment further features adjustable cable clamps and a grounding bar, along with a sealing plate to facilitate cable fixing and sealing.

[0037] In addition, all metal supports inside the enclosure 1 are reliably electrically connected to the grounding busbar, and the doors and partitions of the enclosure 1 are equipped with grounding connection components to ensure that all metal parts inside and outside the enclosure 1 are in an equipotential grounding state.

[0038] Reference Figure 1 and Figure 2In this embodiment, the connection component 2 includes a plug head 21, a conductive terminal 22, and a stress cone 23. The plug head 21 is configured as an elbow-shaped curved cylindrical structure, comprising an inner semiconducting layer, an insulating layer, and an outer semiconducting layer from the inside out. Both the inner and outer semiconducting layers are prefabricated using EPDM conductive rubber, and the insulating layer uses EPDM insulating rubber material, which has flame retardancy, self-extinguishing properties, and excellent heat resistance, enhancing the cable accessory's adaptability to electrical system fluctuations. The plug head 21 is prefabricated using high-quality silicone rubber or EPDM rubber, and has an outer shielding layer with a thickness of not less than 3mm and a grounding resistance of not more than 5KΩ, maintaining the cable connector's outer surface at zero potential and ensuring the connector's outer surface remains grounded and shielded.

[0039] The plug-in head 21 is provided with a front plug 211, a rear plug 212 and a lower plug 213 respectively. One end of the mating sleeve 11 is the front end and the other end of the mating sleeve 11 is the rear end. One end of the front plug 211 is plugged into the front end of the mating sleeve 11. The rear plug 212 is located at the tail of the front plug 211. The rear plug 212 is used to realize the expansion connection of the branch circuit. The rear plug 212 cannot be directly connected to the mating sleeve 11. Its rear end is blocked by an insulating plug or further connected in series with another rear plug 212.

[0040] The lower connector 213 is used to connect with the core of the power cable to form the terminal connection of the cable entry and exit. The conductive terminal 22 is fixedly sleeved on the upper end of the cable and connected to the cable core. After being connected to the cable, the conductive terminal 22 is inserted into the interior of the plug head 21 body through the lower connector 213. A conductor part is provided on the front end of the mating sleeve 11. A double-ended bolt is provided on the conductor part. One end of the double-ended bolt is threaded to the conductor part. The conductive terminal 22 overlaps on the end of the double-ended bolt away from the mating sleeve 11, and the conductive terminal 22 is fixedly connected to the front end of the mating sleeve 11 by the bolt.

[0041] The stress cone 23 is set in a conical curve and is made of EPDM rubber. The stress cone 23 is sleeved on the upper end of the cable and can be inserted and matched with the lower plug 213 of the plug head 21. One end of the stress cone 23 forms a complete potential gradient transition with the semiconducting layer and the insulating layer of the plug head 21, and the other end of the stress cone 23 forms a connection and conduction state with the outer shielding layer of the cable, so that the outer shielding layer of the accessory and the outer shielding layer of the cable are continuously grounded.

[0042] Reference Figure 2 and Figure 3In this embodiment, the quick-connect protective component 3 includes an inner support 31 and a cleaning component 32. The inner support 31 includes an inner support tube 311 and a liquid storage bladder 312. The inner support tube 311 is configured as a thin-walled conical tube. The constricted end of the inner support tube is inserted into the inner cavity of the lower connector 213. A continuous spiral first guide groove 3111 is provided on the inner wall of the inner support tube 311. A traction part 3112 is fixed at one end of the inner support tube 311. One end of the traction part 3112 extends out of the inner support tube 311. When the traction part 3112 is pulled forcefully to extend one end of the inner support tube 311, the inner support tube 311 will tear along the preset trajectory of the first guide groove 3111 and turn into a strip.

[0043] The liquid storage bladder 312 is configured as a cylindrical bladder and is fixedly sleeved on the inner support tube 311. The liquid storage bladder 312 is made of EPDM rubber and is filled with silicone grease. A continuous spiral second guiding groove 3121 is formed on the inner peripheral wall of the liquid storage bladder 312. The pitch and direction of the first guiding groove 3111 and the second guiding groove 3121 are the same. The inner peripheral wall of the liquid storage bladder 312 is fixedly bonded to the outer peripheral wall of the inner support tube 311.

[0044] An inner support tube 311 is disposed inside the lower connector 213. The inner support tube 311 is used to expand the inner diameter of the lower connector 213 and keep the lower connector 213 in an expanded state. At this time, the outer peripheral wall of the liquid storage bladder 312 is fixedly connected to the inner wall of the lower connector 213. In this embodiment, the length of the inner support tube 311 is slightly greater than the inner cavity depth of the lower connector 213, that is, one end of the inner support tube 311 extends out of the lower connector 213, and the length of the liquid storage bladder 312 is the same as the inner cavity depth of the lower connector 213.

[0045] Furthermore, a buffer strip 33 is provided on the inner wall of the inner support tube 311. The buffer strip 33 is made of methyl vinyl silicone rubber. The buffer strip 33 is spirally wound from one end of the inner support tube 311 to the other end of the inner support tube 311 into a conical shape. The spiral winding trajectory of the buffer strip 33 coincides with the spiral line of the first induction groove 3111.

[0046] Reference Figure 2 and Figure 3 In this embodiment, the cleaning component 32 includes a mounting cylinder 321 and a guide sleeve 322. The mounting cylinder 321 is inserted into the inner support tube 311. One end of the mounting cylinder 321 is fixedly provided with an annular extension 3211. The mounting cylinder 321 is fixedly covered to the end of the lower connector 213 through the extension 3211, thereby achieving the sealing of the end of the lower connector 213 by the cleaning component 32. The outer diameter of the mounting cylinder 321 is smaller than the inner diameter of the inner support tube 311. When the mounting cylinder 321 is installed in the inner support tube 311, a buffer gap is formed between the outer peripheral wall of the mounting cylinder 321 and the inner peripheral wall of the inner support tube 311. The traction part 3112 is disposed in the buffer gap.

[0047] The guide sleeve 322 is disposed at one end of the mounting cylinder 321 where the extension 3211 is provided. The guide sleeve 322 is disposed inside the mounting cylinder 321. The guide sleeve 322 is made of fiber-reinforced methyl vinyl silicone rubber. The inner wall of the guide sleeve 322 is provided with a frosted texture, and the inner wall of the guide sleeve 322 is coated with a high cohesion and low exudation type silicone micro-adhesion layer. In this embodiment, the silicone micro-adhesion layer is made of a high cross-linking silicone pressure-sensitive adhesive material. Its cohesive strength is greater than its interfacial adhesion strength. During the process of pulling out the conductive terminal 22, the adhesive layer rebounds and detaches as a whole, and it is not easy for residual adhesive to transfer. The guide sleeve 322 is provided with a first cleaning section 3221 and a second cleaning section 3222. The first cleaning section 3221 is shaped like a flared mouth, and the open end of the first cleaning section 3221 is fixedly connected to the inner wall of the mounting cylinder 321. The second cleaning section 3222 is located on the constricted end of the first cleaning section 3221. The second cleaning section 3222 can completely cover the conductive terminal 22. The second cleaning section 3222 is provided with a cavity that matches the outer contour of the conductive terminal 22, and the cavity is also slightly smaller than the outer contour of the conductive terminal 22. An exhaust hole is provided through the center of the second cleaning section 3222.

[0048] On one side of the guide sleeve 322 facing the inner cavity of the lower connector 213, a first guide line 3223 and a second guide line 3224 are provided along the radial direction of the guide sleeve 322. The first guide line 3223 is set as an intermittent cut, that is, an intermittent cut with a depth of 75% of the thickness of the guide sleeve 322 is made on the guide sleeve 322. The characteristic settings of the first guide line 3223 are the same as those of the second guide line 3224. The area enclosed between the two guide lines is the long strip-shaped weakening guide area 323. A short semi-circular protrusion extends outward from one end of this area facing the exhaust hole as a connecting part 3225. The first guide line 3223 and the second guide line 3224 are circumferentially distributed on the guide sleeve 322 with the axis of the mounting cylinder 321 as the center. A set of traction ropes 324 are fixed on each set of connecting parts 3225. When the traction rope 324 is pulled and torn along the weakening induction zone 323, the entire guide sleeve 322 is divided into several identical silicone rubber pieces, thereby achieving the peeling of the guide sleeve 322 from the conductive terminal 22.

[0049] Furthermore, a first clearance groove 3215 is provided at one end of the mounting cylinder 321 that extends into the lower connector 213, and a second clearance groove 3216 is provided through the extension portion 3211. A first guide line 3212 and a second guide line 3213 are arranged parallel to each other along the axial direction on the outer peripheral wall of the mounting cylinder 321. The first guide line 3212 is set as an intermittent cut, that is, an intermittent cut that completely penetrates the body of the mounting cylinder 321 on the outer peripheral wall of the mounting cylinder 321. The depth of the cut is equal to the thickness of the mounting cylinder 321 itself, forming a slit-like opening that is transparent in the initial state. The first guide line 3212 has the same feature configuration as the second guide line 3213. The area enclosed between the two guide lines is the elongated weakening guide area 325. One end of the weakening guide area 325 is connected to the first clearance groove 3215, and the other end of the weakening guide area 325 is connected to the second clearance groove 3216. A small semi-circular protrusion extends outward from the end of the weakening guide area 325 near the first clearance groove 3215 as a tearing part 3214. Multiple sets of the first guide line 3212 and the second guide line 3213 are provided on the mounting cylinder 321. The weakening guide area 325 corresponds one-to-one with the weakening induction area 323. Each set of tearing parts 3214 is fixedly connected to the end of the weakening induction area 323 away from the connecting part 3225.

[0050] The end of the traction rope 324 away from the connecting part 3225 extends to the outside of the mounting cylinder 321 via the first clearance groove 3215 and the second clearance groove 3216. At the same time, a sealing film 326 is additionally provided on the end face of the mounting cylinder 321 where the extension part 3211 is provided. The sealing film 326 is made of aluminum foil paper, and the sealing film 326 makes the entire guide sleeve 322 a sealed chamber.

[0051] Specifically, during the emergency repair of power distribution networks, the construction often needs to be completed within a limited timeframe. This makes it highly susceptible to foreign objects getting trapped inside the conductive contact areas during installation. For example, foreign objects can easily get stuck between the upper end of the cable and the plug 21, leading to increased local contact resistance and potential localized overheating. The guide sleeve 322, made of fiber-reinforced methyl vinyl silicone rubber, is installed so that the cable end with the conductive terminal 22 installed can be inserted into the guide sleeve 322. Because the inner wall of the guide sleeve 322 is coated with an organosilicon pressure-sensitive adhesive, the cable connection end can be cleaned, and the connection remains intact during subsequent tearing, preventing additional debris.

[0052] For those skilled in the art, although the industry standard procedure for connecting cables and conductive terminals 22 requires cleaning the cable connection points and conductive terminals 22 with a professional cleaning cloth during connection, in actual emergency repair environments, the operating site is uncontrollable. Even with relevant cleaning operations, it is still impossible to guarantee a consistently thorough cleaning. Therefore, during the formal insertion of the plug-in head 21, a relatively enclosed cleaning chamber is set up independently. In this way, targeted cleaning can be carried out before the formal installation is completed.

[0053] Next, the conductive terminal 22 is inserted further into place, and the traction rope 324 is pulled to tear the guide sleeve 322 and the mounting cylinder 321 into several pieces of the same size along the pre-set guide line and guide line, thereby removing the cleaning part 32 from the plug head 21. As the cleaning part 32 is removed, the traction part 3112 temporarily stored in the buffer gap is exposed. At this time, the traction part 3112 is pulled forcefully to tear the inner support tube 311 along the preset first guide groove 3111 trajectory and turn it into a strip. After losing the support of the inner support tube 311, the inner cavity of the lower plug 213 will shrink inward, thereby tightly covering the cable and the stress cone 23 installed on the cable. Meanwhile, during this process, since there is a tight connection between the liquid reservoir 312 and the inner support tube 311, when the inner support tube 311 is torn into strips along the preset path, the inner side of the connection between the liquid reservoir 312 and the inner support tube 311 will also be torn into strips and discharged from the lower connector 213 along with it. The pre-filled silicone grease in the liquid reservoir 312 will automatically fill the gap between the cable and the lower connector 213 as the lower connector 213 contracts.

[0054] The implementation principle of the quick-connect cable branch box in this application embodiment is as follows: the plug-in head 21 in the connection assembly 2 forms a conductive connection with the docking sleeve 11 through the front plug 211, and the lower plug 213 is used to connect with the cable core on which the conductive terminal 22 is installed. The conductive terminal 22 is fixed and conductive to the conductor part of the docking sleeve 11 by a double-headed bolt, so that the cable and the busbar of the branch box form a stable electrical connection. At the same time, the stress cone 23, the semi-conductive layer and the insulating layer in the plug-in head 21 together constitute a continuous electric field control structure, so that the outer shielding layer of the cable and the outer shielding layer of the plug-in head 21 are kept in a continuous grounding state, thereby reducing the electric field concentration phenomenon and improving the insulation stability.

[0055] Before formal insertion, the quick-connect protective assembly 3 is pre-installed inside the lower connector 213. The inner support tube 311 is inserted into the inner cavity of the lower connector 213 to provide radial expansion support for the lower connector 213, so that the lower connector 213 is kept in a pre-expanded state, so that the conductive terminal 22 and stress cone 23 can be quickly inserted, while reducing scratches on the inner wall of the plug head 21 during forced insertion.

[0056] The mounting sleeve 321 and the guide sleeve 322 together form a relatively closed clean guide channel. When the cable end with the conductive terminal 22 is inserted into the guide sleeve 322, the frosted texture on the inner wall of the guide sleeve 322 and the silicone pressure-sensitive adhesive coating can adsorb and clean the dust, metal particles and impurities attached to the surface of the conductive terminal 22 and the cable connection area, thereby preventing foreign objects from entering the final conductive contact area.

[0057] After the conductive terminal 22 is inserted, the operator pulls the traction rope 324, causing the guide sleeve 322 to be directionally torn along the weakened guiding area 323 formed by the first guiding line 3223 and the second guiding line 3224. At the same time, the mounting cylinder 321 is separated along the weakened guiding area 325 formed by the first guiding line 3212 and the second guiding line 3213, thereby dividing the cleaning component 32 into several sheet-like structures and quickly removing it from the plug-in head 21, so as to ensure that the completed conductive connection is not affected during the disassembly process.

[0058] Subsequently, the traction part 3112 located in the buffer gap is exposed. When the traction part 3112 is pulled further, the first induction groove 3111 provided along the inner wall of the inner support tube 311 undergoes a spiral directional tear and gradually changes from a cylindrical structure to a strip structure. After losing the support of the inner support tube 311, the lower plug joint 213 shrinks inward by its own elastic restoring force, thereby forming a tight wrap around the outer periphery of the cable and the stress cone 23, improving the sealing performance and mechanical fixation stability of the connection part 3225.

[0059] Meanwhile, since the liquid storage bladder 312 is fixedly sleeved on the outer periphery of the inner support tube 311, and its inner peripheral wall is provided with a second guiding groove 3121 with the same pitch and direction of rotation as the first guiding groove 3111, the corresponding area of ​​the liquid storage bladder 312 also ruptures synchronously during the process of the inner support tube 311 being torn apart and pulled out. The silicone grease pre-stored inside is automatically released and fills the gap area between the outer periphery of the cable and the inner wall of the lower connector 213, thereby achieving the functions of lubrication, moisture prevention, insulation and air isolation of the connection area, further reducing the risk of partial discharge and increased contact resistance, and improving the long-term operational stability of the cable terminal connection.

[0060] The above are all optional embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A quick-connect cable branch box, characterized in that, include: The enclosure (1) is provided with a connecting sleeve (11) for cable connection. A connecting assembly (2) is installed inside the housing (1). The connecting assembly (2) includes a plug head (21) and conductive terminals (22). The plug head (21) is provided with a front connector (211), a rear connector (212), and a lower connector (213). The front connector (211) is used to connect and communicate with the mating sleeve (11). The lower connector (213) is used to connect with the cable on which the conductive terminal (22) is installed. The conductive terminal (22) is fixedly connected to the cable core and is connected and communicates with the mating sleeve (11). A quick-connect protective assembly (3) is installed inside the plug head (21). The quick-connect protective assembly (3) includes an inner support (31) and a cleaning component (32). The inner support (31) includes an inner support tube (311) and a liquid reservoir (312). The inner support tube (311) is removably inserted into the inner cavity of the lower plug head. The inner support tube (311) is used to radially expand and support the lower plug head (213). The liquid reservoir (312) is fixedly sleeved on the inner support tube (311). The liquid reservoir (312) contains an insulating medium. The cleaning component (32) includes a mounting cylinder (321) and a guide sleeve (322). The mounting cylinder (321) is fixedly covered to the end of the lower connector (213). The guide sleeve (322) is disposed inside the mounting cylinder (321). The guide sleeve (322) is used to adsorb and clean the surface of the conductive terminal (22) of the cable when it is inserted. The cleaning component (32) and the inner support component (31) are configured to be torn apart and removed sequentially by a traction operation after the conductive terminal (22) is plugged in, so that the lower connector (213) shrinks to cover the cable and simultaneously releases the insulating medium to fill the gap between the cable and the lower connector (213).

2. The quick-connect cable branch box according to claim 1, characterized in that: The inner support tube (311) is configured as a thin-walled conical tube. A continuous spiral first guiding groove (3111) is provided on the inner wall of the inner support tube (311). A traction part (3112) is fixed at one end of the inner support tube (311). When the traction part (3112) is pulled, the inner support tube (311) can be torn along the first guiding groove (3111) and transformed into a strip structure.

3. A quick-connect cable branch box according to claim 2, characterized in that: The inner outer peripheral wall of the liquid storage bladder (312) is provided with a continuous spiral second induction groove (3121). The pitch and direction of the first induction groove (3111) and the second induction groove (3121) are the same. The inner outer peripheral wall of the liquid storage bladder (312) is fixedly connected to the outer peripheral wall of the inner support tube (311). The liquid storage bladder (312) is filled with silicone grease.

4. A quick-connect cable branch box according to claim 2, characterized in that: The mounting cylinder (321) is inserted into the inner support tube (311). One end of the mounting cylinder (321) is fixedly provided with an annular extension (3211). The mounting cylinder (321) is fixedly covered to the end of the lower connector (213) through the extension (3211). The outer diameter of the mounting cylinder (321) is smaller than the inner diameter of the inner support tube (311). A buffer gap is formed between the mounting cylinder (321) and the inner support tube (311) to accommodate the traction part (3112).

5. A quick-connect cable branch box according to claim 4, characterized in that: The guide sleeve (322) is disposed at one end of the mounting cylinder (321) where the extension (3211) is located. The inner wall of the guide sleeve (322) is coated with a layer of high cohesion and low precipitation type organosilicon micro-adhesion layer. The guide sleeve (322) is respectively provided with a first cleaning section (3221) and a second cleaning section (3222). The first cleaning section (3221) is configured as a flared mouth shape, and the open end of the first cleaning section (3221) is fixedly connected to the inner wall of the mounting cylinder (321). The second cleaning section (3222) is disposed on the constricted end of the first cleaning section (3221). The second cleaning section (3222) is provided with a cavity that matches the outer contour of the conductive terminal (22), and the cavity is smaller than the outer contour of the conductive terminal (22). An exhaust hole is provided through the center of the second cleaning section (3222).

6. A quick-connect cable branch box according to claim 5, characterized in that: The guide sleeve (322) is provided with a first guide line (3223) and a second guide line (3224). Both the first guide line (3223) and the second guide line (3224) are set as discontinuous cuts that do not penetrate the guide sleeve (322). A long strip-shaped weakening guide area (323) is formed between the first guide line (3223) and the second guide line (3224). One end of the weakening guide area (323) is provided with a connecting part (3225), and a traction rope (324) is fixedly connected to the connecting part (3225). The outer peripheral wall of the mounting cylinder (321) is provided with a first guide line (3212) and a second guide line (3224). 3213), the first guide line (3212) and the second guide line (3213) are both discontinuous cuts that completely penetrate the wall of the mounting cylinder (321). A long strip-shaped weakened guide area (325) is formed between the first guide line (3212) and the second guide line (3213). One end of the weakened guide area (325) is provided with a tearing part (3214). The tearing part (3214) is fixedly connected to the end of the weakened guide area (323) away from the connecting part (3225), so that when the traction rope (324) is pulled, the guide sleeve (322) and the mounting cylinder (321) can be torn in sequence and directionally.

7. A quick-connect cable branch box according to claim 6, characterized in that: The mounting cylinder (321) has a first clearance groove (3215) at one end away from the extension (3211), and a second clearance groove (3216) is provided on the extension (3211). One end of the weakening guide area (325) is connected to the first clearance groove (3215), and the other end of the weakening guide area (325) is connected to the second clearance groove (3216). The end of the traction rope (324) away from the connecting part (3225) extends to the outside of the mounting cylinder (321) through the first clearance groove (3215) and the second clearance groove (3216).

8. A quick-connect cable branch box according to claim 7, characterized in that: A sealing membrane (326) is fixed on the end face of the extension (3211) of the mounting cylinder (321), and the sealing membrane (326) is used to form a sealed chamber inside the guide sleeve (322).

9. A quick-connect cable branch box according to claim 3, characterized in that: The inner wall of the inner support tube (311) is also provided with a buffer strip (33), which is made of silicone rubber and is wound into a cone shape along the spiral trajectory of the first induction groove (3111).

Images