A 35 kV insulating intermediate joint

Abstract

The present application relates to cable joint technical field, specifically to a kind of 35kV insulation intermediate joint, including positioning plate, conductor positioning assembly and joint box.Several conductor positioning assembly is linearly arranged and evenly distributed along positioning plate, and conductor positioning assembly is composed of slide plate seat, occlusion positioner, screw sleeve block and screw rod.Occlusion positioner uses left intersection block and right intersection block arranged in cross, and synchronous deflection is realized by the double-section reverse thread drive of screw rod, so that occlusion groove is multi-angle occlusion compression to cable joint, and the mechanical stability of conductor connection is improved.Positioning plate is provided with sensor positioning groove, and monitoring sensor can be embedded, to realize the real-time monitoring of joint operating state.Joint box adopts two-limb structure, and electric shielding net layer and sealing perfusion passage are arranged in inner side, to carry out overall closure and waterproof and moisture-proof treatment to conductor positioning assembly.The present application has high degree of structure modularization, high precision, and can improve the compression effect, insulation reliability and operation monitoring capability of cable joint.

Description

Technical Field

[0001] This invention relates to the field of cable joint technology, specifically a 35kV insulated intermediate joint. Background Technology

[0002] With the widespread application of 35kV cable lines in urban and industrial power grids, cable joints, as crucial connection nodes, directly impact the operational safety of the entire line due to their mechanical stability, sealing reliability, and electrical performance. Existing high-voltage cable joints typically employ an integral sealed structure combined with crimped conductor connections, using external heat-shrink or cold-shrink tubing for structural encapsulation. However, in practical engineering applications, various cable joints still suffer from problems such as difficulty in modularizing their structure, complex installation, limited crimping methods, and insufficient monitoring capabilities, failing to fully meet the demands of modern power grids in terms of intelligence, reliability, and long-term operation.

[0003] Traditional cable joints often employ integral seals or one-piece molded insulation structures. Their internal components are typically non-removable and lack modular configuration capabilities, significantly limiting the installation, adjustment, and maintenance of the joints. For cables of different diameters and structures, existing solutions often require different models or specifications of encapsulation configurations, resulting in poor adaptability and insufficient versatility. Furthermore, they hinder the replacement and upgrading of internal positioning components.

[0004] In terms of conductor positioning and clamping structures, traditional intermediate joints mostly employ single-point clamping, radial tension, or metal sleeve-type fixing methods. These structures have a single mechanical path and lack the ability to perform multi-angle, multi-contact engagement of the cable joint. Their clamping effect often relies on manual operation or external heat shrinking processes, resulting in uneven clamping force. This can lead to problems such as eccentric clamping, excessive localized stress, or loosening, thereby affecting the mechanical stability and long-term reliability of the cable conductor connection section.

[0005] Existing cable joints are often encapsulated entirely by external sleeves, lacking multiple positioning structures distributed along the cable's axial direction. During installation, due to the limited number or uneven distribution of clamping units, insufficient alignment and discontinuous clamping can easily occur at the joint, leading to uneven stress distribution in the connection area and affecting its insulation performance and long-term operational stability. Furthermore, insufficient clamping at multiple points can cause micro-displacement of the cable due to thermal expansion and contraction during operation, potentially leading to loose connections or localized overheating.

[0006] In summary, current 35kV cable intermediate joints have significant shortcomings in terms of insufficient adaptability of modular structure, lack of multi-angle linkage capability in conductor clamping method, and discontinuous arrangement of clamping components. There is an urgent need for a technical solution that can achieve modular sealing, staggered deflection interlocking clamping, and linear arrangement of multiple components to improve overall alignment accuracy, thereby solving the defects in the existing technology and improving the installation quality and operational reliability of cable intermediate joints. Summary of the Invention

[0007] The present invention aims to solve one of the technical problems existing in the prior art or related technologies.

[0008] Therefore, the technical solution adopted in this invention is: a 35kV insulated intermediate joint, which solves the problems of insufficient mechanical clamping reliability, cable joint alignment accuracy, electrical monitoring capability, and overall sealing performance of existing 35kV cable intermediate joints. This invention proposes a 35kV insulated intermediate joint with adjustable structure, stable locking effect, multi-parameter monitoring capability, and suitability for high-voltage operating environments. Through an innovative cross-interlocking positioning structure, bidirectional threaded drive mechanism, embeddable sensor interface, and electrically shielded sealing structure, this invention establishes a synergistic system for the installation, clamping, monitoring, and protection of the cable joint, thereby effectively improving the mechanical stability, electrical safety, and environmental adaptability of the intermediate joint.

[0009] The overall technical solution of the present invention is as follows: the 35kV insulated intermediate joint includes a positioning plate, at least two conductor positioning components and a joint box. The centering and stable clamping of the cable joint are achieved through a series of mechanical linkage structures. Real-time monitoring of the cable operation status is achieved through the embedded installation of monitoring sensors. The sealing structure of the joint box and the electric shielding mesh layer achieve isolation and protection from the external environment and high-voltage electric field, thereby meeting the long-term operation requirements of the power system.

[0010] For ease of understanding, the main technical solutions of this invention can be elaborated as follows:

[0011] In a preferred embodiment, the present invention provides a 35kV insulated intermediate joint, comprising a positioning plate, conductor positioning components, and a joint box. Several conductor positioning components are linearly distributed along the surface of the positioning plate, providing symmetrical and continuous compression support for the cable joint. The joint box forms an integral enclosed protective structure for the positioning plate and conductor positioning components, protecting the cable joint from moisture, water immersion, and contamination. Specifically, by providing sensor positioning slots and shaft hole structures on the positioning plate, a monitoring module can be embedded therein, improving the operational monitoring capability and installation consistency of the intermediate joint.

[0012] In a preferred example, the conductor positioning assembly includes a sliding plate, a clamping positioner, a threaded sleeve block, and a screw; wherein the sliding plate and the clamping positioner are hinged via sliding lugs to form a deflectable structure. Specifically, the sliding plate can slide along the positioning plate to adjust its installation position, thereby accommodating connector lengths of different specifications and improving installation compatibility; the clamping positioner consists of cross-arranged left and right interlocking blocks, enabling it to form a three-dimensional clamping path around the cable connector, and achieves controllable rotation via a pin and positioning plate, ensuring the cable connector maintains centering stability during the clamping process.

[0013] In a preferred example, the left and right interlocking blocks of the engagement positioner have identical structures, both featuring a bite groove and a ball-and-socket sleeve. The bite groove employs a polygonal structure, creating multi-angle engagement points during deflection, thereby achieving a directional clamping effect on the outer layer of the cable. The ball-and-socket sleeve structure forms a spherical fit with the threaded sleeve block, ensuring smooth and stable engagement during deflection and clamping. Specifically, through the linkage structure between the threaded sleeve block and the screw, the left and right interlocking blocks can achieve synchronous relative rotation, providing a stable locking force for the cable joint.

[0014] In a preferred example, the outer periphery of the threaded sleeve block is spherically curved and rotates onto the ball socket sleeve. The screw passes through the threaded sleeve block and has two sections with opposite spiral directions. Specifically, when the screw is tightened, it can simultaneously drive the left and right interlocking blocks to deflect in opposite directions, thereby achieving synchronous clamping. This ensures that the action path of the cable joint locking structure remains consistent, effectively avoiding eccentricity and uneven pressure caused by unilateral clamping, and improving the mechanical stability and clamping firmness of the joint connection.

[0015] In a preferred example, the positioning plate, left junction block, and right junction block are all made of metallic conductor material, and a conductive reinforcement area is formed on the surface of the positioning plate. Specifically, this structure ensures that a stable electrical extension path is formed in the cable joint area under compressed conditions, improves the electrical consistency of the cable connection segment, reduces the risk of heat generation caused by local resistance, and improves the quality of monitoring signal transmission.

[0016] In a preferred example, an electrical shielding mesh layer is embedded inside the junction box and arranged in a wrapping manner along the inner wall of the box. Specifically, the electrical shielding mesh layer is used to continue the electric field distribution of the cable body, so that the electric field in the joint area remains uniform, avoiding stress concentration that could cause partial discharge. At the same time, it connects with the grounding electrode to form a reliable grounding path, improving overall insulation safety and anti-interference capability.

[0017] The beneficial effects achieved by this invention are as follows:

[0018] 1. In this invention, the modular design of the sealing assembly and conductor positioning assembly makes the installation process of the cable joint more standardized and convenient. The modular structure can adapt to the installation requirements of cables of different specifications, and makes the layout of each functional unit within the joint clearer, facilitating maintenance and replacement, while significantly improving the sealing integrity and environmental adaptability of the joint area.

[0019] 2. In this invention, the novel conductor positioning assembly utilizes an interleaved deflection engagement mechanism to achieve stable multi-contact engagement through the synchronous deflection of the left and right interleaving blocks, enabling the cable joint to simultaneously obtain clamping force in both the radial and axial directions. This structure effectively improves the mechanical stability of the cable conductor connection, reduces the risk of eccentric force and loosening that may occur with traditional clamping methods, thereby enhancing the overall mechanical locking reliability of the joint.

[0020] 3. In this invention, several conductor positioning components are arranged in a straight line along the positioning plate to form a distributed clamping system, ensuring that the cable joint receives uniform clamping force throughout the entire connection area. This linear arrangement not only improves the consistency of the clamping effect but also ensures that the cable joint maintains good alignment during installation, thereby further enhancing electrical performance and long-term operational stability. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the installation structure of a conductor positioning assembly according to an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of a junction box structure according to an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the positioning plate structure according to an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the bite positioner structure according to an embodiment of the present invention;

[0026] Figure 6 This is an exploded structural diagram of an bite positioner according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the surface structure of the right intersecting block according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the screw surface structure according to an embodiment of the present invention.

[0029] Figure label:

[0030] 100. Positioning plate; 110. Shaft hole; 101. Sensor positioning slot;

[0031] 200. Conductor positioning assembly; 210. Slide plate seat; 220. Engaging positioner; 230. Screw sleeve block; 240. Screw; 211. Slide lug; 221. Left interlocking block; 222. Right interlocking block; 223. Ball socket sleeve; 224. Engaging groove;

[0032] 300. Junction box; 301. Locking lug; 302. Sealing port; 303. Filling valve head. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0034] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0035] The following describes, with reference to the accompanying drawings, some embodiments of a 35kV insulating intermediate joint provided by the present invention.

[0036] Combination Figures 1-8 As shown, the present invention provides a 35kV insulating intermediate joint, comprising a positioning plate 100, a conductor positioning assembly 200, and a joint box 300. Several conductor positioning assemblies 200 are linearly distributed along the surface of the positioning plate 100, and the joint box 300 is used to seal and protect the positioning plate 100 and the conductor positioning assemblies 200. The conductor positioning assembly 200 includes a sliding plate seat 210, a snap-fit ​​positioner 220, a threaded sleeve block 230, and a screw 240. A sliding lug 211, hinged to the end of the snap-fit ​​positioner 220, is slidably mounted on the surface of the sliding plate seat 210, allowing the snap-fit ​​positioner 220 to be deflected and adjusted with the sliding plate seat 210 as a fulcrum. The snap-fit ​​positioner 220 consists of a left intersecting block 221 and a right intersecting block 222 arranged in a crisscross pattern. Both have the same structure, and each has a pin on one side that is rotatably connected to the surface of the shaft hole 110 of the positioning plate 100. Both the left intersecting block 221 and the right intersecting block 222 have grooves 224 on their surfaces, and each has a ball socket sleeve 223 at one end. A threaded sleeve block 230 is rotatably fitted inside the ball socket sleeve 223. A screw 240 passes through and is fitted inside the threaded sleeve block 230 on the surfaces of the left intersecting block 221 and the right intersecting block 222. Through the tightening action of the screw 240, synchronous relative deflection movement of the left intersecting block 221 and the right intersecting block 222 can be achieved. The surface of the positioning plate 100 has a sensor positioning groove 101 for installing a cable monitoring sensor assembly. The inner side of the connector box 300 has slots for the positioning plate 100 and the slide block 210. The surface of the connector box 300 has a filling valve head 303 for filling sealant into its interior.

[0037] In this embodiment, the sensor group can be configured as a multi-type monitoring unit for monitoring the operating status of the cable joint, including but not limited to temperature sensors, current sensors, voltage sensors, partial discharge detection sensors, humidity sensors, and pressure sensors. The temperature sensor is used to collect real-time temperature rise data in the joint area; the current and voltage sensors are used to collect cable load operating information; the partial discharge detection sensor is used to monitor partial discharge signals that may occur within the insulation structure to provide early warning of insulation aging or defects; the humidity sensor is used to detect humidity changes inside the joint box; and the pressure sensor is used to monitor pressure stability within the sealed cavity. The above sensor group can be arbitrarily combined and configured according to actual operating requirements, and installed on the positioning plate 100 through corresponding sensor positioning slots, enabling continuous monitoring of the cable joint's operating status.

[0038] In this embodiment, there are at least two engagement positioners 220, which are evenly distributed along the surface of the positioning plate 100 to form a symmetrical clamping structure, thereby ensuring that the cable connector receives balanced clamping force on both sides. The positioning plate 100 is symmetrically distributed on both sides of the engagement positioners 220, making the overall clamping structure symmetrically arranged. The surface of the positioning plate 100 is provided with shaft holes 110 for engaging with pins on the surfaces of the left interlocking block 221 and the right interlocking block 222, so that a stable connection is formed between the monitoring sensor and the mechanical positioning structure.

[0039] In this embodiment, one end of the junction box 300 is provided with a hinge, allowing the two-part structure to open and close; the other end is provided with several locking lugs 301 for threaded screws to lock, ensuring that the junction box 300 forms a stable enclosure when closed. Both ends of the junction box 300 are provided with sealing ports 302, allowing cables to enter and exit the junction box 300 and form a sealed enclosure, thereby providing a closed, waterproof, moisture-proof, and insulating protective structure for the entire junction area.

[0040] In this embodiment, the pin structures of the left intersecting block 221 and the right intersecting block 222 are coaxially arranged, ensuring a stable geometric relationship during deflection. The pins and the bite groove 224 are located on the same axis, allowing the bite groove 224 to create a directional biting effect on the cable surface during deflection. The bite groove 224 is polygonal, providing multi-contact clamping at different angles, resulting in a higher degree of fit for the cable joint during deflection locking. When the two intersecting blocks 221 and 222 deflect relative to each other, a biting clamping force is formed on the surface of the cable joint, and an inclined pressure is applied along the cable axis, achieving a tighter compression and mechanical locking at the connection point.

[0041] In this embodiment, the outer periphery of the threaded sleeve block 230 is a spherical curved surface structure. This curved surface structure forms a rotational connection with the ball socket sleeve 223, enabling the threaded sleeve block 230 to perform angle adaptive compensation when the screw 240 is tightened, thereby ensuring smooth operation of the left interlocking block 221 and the right interlocking block 222 in the deflection path. The inner side of the threaded sleeve block 230 is provided with thread grooves adapted to the screw 240, enabling the screw 240 to stably engage with the threaded sleeve block 230.

[0042] In this embodiment, the surface thread of the screw 240 adopts a two-section structure, and the two sections of the thread have opposite directions of rotation, so that when the screw 240 is tightened, it can simultaneously drive the left interlocking block 221 and the right interlocking block 222 in opposite directions to achieve synchronous relative deflection movement, so that the biting positioning structure achieves synchronous pressing effect.

[0043] In this embodiment, the left junction block 221, the right junction block 222, and the positioning plate 100 are all made of metal conductor material, which enables the mechanism components to have good electrical continuity under the compression state. The surface of the positioning plate 100 is provided with a conductive enhancement treatment area, so that the left junction block 221 and the right junction block 222 form a stable electrical extension path when the cable is compressed, thereby improving the electrical consistency of the joint area and the stability of the monitoring signal transmission.

[0044] In this embodiment, an electrical shielding mesh layer is embedded and installed inside the junction box 300. This electrical shielding mesh layer is arranged in a wrapping manner along the inner wall of the junction box 300, allowing the original electric field distribution of the cable to continue in the junction area and preventing the appearance of electric fields at the tips. The electrical shielding mesh layer is fixed to the inner wall of the junction box 300, so that it maintains its complete structure after the sealant is poured in, and a grounding electrode is electrically connected to the end of the electrical shielding mesh layer.

[0045] In the process of using this invention, by peeling off the outer sheath of the cable, installing the positioning plate 100 and the conductor positioning assembly 200, rotating the screw 240 to drive the biting positioner 220 to achieve clamping, embedding the sensor group, sealing the junction box 300 and pouring sealant, a 35kV high-voltage cable intermediate joint structure with good sealing, waterproof and electrical stability can be finally formed, and it can be put into use after passing the withstand voltage and insulation tests.

[0046] Working principle and usage process of this invention:

[0047] The outer sheath, shielding layer, and part of the insulation layer of the two sections of cable to be connected are stripped according to the standard, the conductor positioning assembly 200 is inserted, and the conductor is crimped or mechanically connected to enable continuous conduction.

[0048] Positioning plate 100 is placed in the cable joint area, with shaft hole 110 and sensor positioning groove 101 facing the center of the cable, reserving structural interfaces for subsequent installation of engagement positioner 220 and monitoring sensor group.

[0049] Adjust the cable connector to the appropriate position of the conductor positioning assembly 200, and manually operate the screw 240 to rotate, so that the left interlocking block 221 and the right interlocking block 222 are synchronously deflected to contact the outer surface of the cable and gradually form a pressing state, so that the two cable connectors are axially pressed and locked.

[0050] The required cable monitoring sensor group, such as temperature sensing, current and voltage sensing sensors, is embedded in the sensor positioning slot 101 of the positioning plate 100 to realize real-time monitoring of the cable's operating status.

[0051] The junction box 300 is opened and fitted onto the junction area, so that the positioning slot corresponds to and limits the positioning plate 100 and the slide plate seat 210. After closing the junction box 300, it is locked by the screw through the locking lug hole 301, and the outer diameter of the cable is sealed at the sealing port 302.

[0052] As needed, sealant can be filled into the junction box 300 through the injection valve head 303 to create an impregnated seal, ensuring the junction area is protected from moisture, water immersion, and external contaminants. After installation, withstand voltage tests, insulation tests, and monitoring system calibrations are performed on the junction area. Once the operational performance is confirmed to meet the requirements of the 35kV power system, it can be put into use.

[0053] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0054] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A 35 kV insulating intermediate joint, characterized in that, The utility model relates to a kind of cable jointing device, including: Positioning plate (100), conductor positioning assembly (200) and joint box (300), several conductor positioning assembly (200) is linearly distributed along the surface of the positioning plate (100), and the joint box (300) is used to seal the protection of the positioning plate (100) and the conductor positioning assembly (200); The conductor positioning assembly (200) includes slide plate seat (210), occlusion positioner (220), screw sleeve block (230) and screw rod (240), the surface of the slide plate seat (210) is slidably installed with the slide ear (211) hinged with the end of the occlusion positioner (220);The occlusion positioner (220) includes left cross block (221) and right cross block (222) arranged with each other, the left cross block (221) and right cross block (222) are same structure, and one side is equipped with the pin shaft rotatably connected with the surface of the positioning plate (100);The surface of the left cross block (221) and right cross block (222) is provided with occlusion groove (224), and one end is provided with ball socket (223), the screw sleeve block (230) is rotatably sleeved on the inner side of the ball socket (223), and the screw rod (240) is penetrated and is sleeved on the inner side of the screw sleeve block (230) on the surface of the left cross block (221) and right cross block (222), and the relative deflection of the left cross block (221) and the right cross block (222) is realized under the action of screw rod (240) is tightened.

2. An insulating intermediate joint for 35 kV according to claim 1, characterized in that, The surface of the positioning plate (100) is provided with sensor positioning groove (101) for embedding and installing cable monitoring sensor group.

3. An insulating intermediate joint for 35 kV according to claim 1, characterized in that, The number of the occlusion positioner (220) is at least two, and is linearly and uniformly distributed along the surface of the positioning plate (100), the surface of the positioning plate (100) is provided with shaft hole (110) for sleeving with the pin shaft on the surface of the left cross block (221) and the right cross block (222).

4. An insulating intermediate joint for 35 kV according to claim 1, characterized in that, The joint box (300) is two-limb structure, one end is hingedly connected, the other end is provided with a plurality of lock ear holes (301) for penetrating screw rod and locking, the two ends of the joint box (300) are provided with sealing port (302), for cable joint inlet and sealing, the surface of the joint box (300) is provided with pouring valve head (303), for pouring sealant into the inside of the joint box (300).

5. An insulating intermediate joint for 35 kV according to claim 1, characterized in that, The pin shaft on the surface of the left cross block (221) and right cross block (222) is coaxially arranged, and the pin shaft is on the same axis as the occlusion groove (224), the occlusion groove (224) is polygonal, and is used for occluding the surface of cable joint under the inclination of the occlusion positioner (220).

6. An insulating intermediate joint for 35 kV according to claim 1, characterized in that, The outer periphery of the screw sleeve block (230) is spherical curved surface, and is rotatably sleeved on the inner side of the ball socket (223), the inner side of the screw sleeve block (230) is provided with screw thread groove matched with the screw rod (240).

7. An insulating intermediate joint for 35 kV according to claim 1, characterized in that, The screw thread on the surface of the screw rod (240) is two-section structure, and the rotation direction of two sections of screw thread is opposite, for driving the left cross block (221) and the right cross block (222) to move synchronously relative.

8. An insulating intermediate joint for 35 kV according to claim 1, characterized in that, The left cross block (221), the right cross block (222) and the positioning plate (100) are all metal conductor material members, and the positioning plate (100) is provided with a mounting area subjected to conductive strengthening treatment on the surface, for improving the conductive continuity of the left cross block (221) and the right cross block (222) during the pressing process.

9. An insulating intermediate joint for 35 kV according to claim 1, characterized in that, The inner side of the joint box (300) is provided with a slot for positioning the positioning plate (100) and the slide plate seat (210); an electric shielding net layer is embedded and mounted on the inner side of the joint box (300), the electric shielding net layer is arranged in a cladding mode and is fixed with the inner wall of the joint box (300), for forming a continuous and complete electric shielding structure.

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