35kV environment-friendly aluminum alloy inner cone terminal

Abstract

The invention relates to the technical field of power transmission and distribution, in particular to a 35kV environment-friendly aluminum alloy inner cone terminal which comprises a conductive core body, a connector body, an equipment end and an outer insulation sheath, and a stress control tube is arranged in the outer insulation sheath and used for improving electric field distribution. The connector body is composed of a conductive sleeve, a sliding disc, a rotating wheel seat and a lock mother disc, a ratchet meshing structure is arranged between the sliding disc and the lock mother disc, a guide pin is arranged in the rotating wheel seat and used for guiding the lock mother disc to move axially, and a threaded sleeve hole is formed in the inner side of the lock mother disc and matched with a drilling and inserting rod and a spiral groove of the drilling and inserting rod on the end of equipment. And the joint body automatically generates spiral sleeving and self-locking actions under the action of insertion force, so that a stable mechanical locking and conductive path is formed. A deflectable power connection clamping piece is adopted for cable access, and the clamping force is adjusted by controlling a screw rod, so that reliable conductor contact is realized. The terminal has the characteristics of quick plugging, automatic locking, rotary unlocking, high conductive stability and the like, and the terminal installation efficiency and the outdoor operation reliability are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of power transmission and distribution technology, specifically a 35kV environmentally friendly aluminum alloy inner cone terminal. Background Technology

[0002] In 35kV power systems, cable terminals are commonly used as connection units between equipment and cable ends. Their installation typically requires reliable mechanical locking and stable electrical contact. Currently, outdoor medium- and high-voltage cable terminals are often fixed using threaded crimping, bolt locking, or external mechanical clamps. These structures usually require tools for installation and disassembly, making the installation process complex and time-consuming. This makes it difficult to meet the needs of rapid replacement or on-site emergency repairs, resulting in low overall terminal assembly and disassembly efficiency.

[0003] Regarding the connection structure between cables and equipment, existing technologies mostly employ methods such as metal conical fittings, threaded connectors, or crimp sleeves. Taking threaded connections as an example, the connector body needs to be manually tightened to the specified torque; taking conical crimping structures as an example, additional axial pressure or locking bolts are required. These traditional structures all suffer from drawbacks such as cumbersome insertion actions, difficulty in achieving self-guided insertion, and high dependence on tools, failing to meet the application requirements for rapid insertion / removal or automatic alignment.

[0004] Furthermore, existing technologies for mechanical locking between terminals and devices mostly rely on external nuts, annular grooves, or independent locking components, lacking a screw-in / screw-out built-in locking structure similar to a screw-nut. This necessitates first removing external fasteners before pulling out the bolt, a complex process with significant disassembly resistance, hindering routine maintenance. In complex outdoor environments, bolt-locking structures are susceptible to rust, mud, and dirt, causing jamming and further increasing the difficulty of disassembly and assembly.

[0005] Therefore, existing technologies generally suffer from low terminal assembly efficiency, lack of self-guiding structures for direct plug-in connection, and cumbersome disassembly operations. There is an urgent need for a new structure with quick plug-in, stable self-locking, and rotatable unlocking capabilities to improve the installation efficiency, maintenance convenience, and operational reliability of medium and high voltage cable terminals. Summary of the Invention

[0006] This invention aims to solve the problems of low installation efficiency, complex insertion and disassembly, and reliance on external fasteners for locking structures in existing 35kV outdoor cable terminals. This invention proposes an environmentally friendly aluminum alloy inner cone terminal, which achieves rapid insertion, adaptive locking, and rotational unlocking of the terminal by setting up a drill rod guiding structure, a screw sleeve hole self-spinning structure, a ratchet-type one-way locking structure, and a guide pin-guided axial movement mechanism, thereby significantly improving the assembly efficiency and operational reliability of the terminal system.

[0007] The overall solution of the present invention mainly includes a conductive core, a connector body, an equipment end, and an outer insulating sleeve. An internal movable locking mechanism is formed by a sliding plate, a locking nut plate, a rotating wheel seat, and a conductive sleeve, which enables the terminal to be automatically guided, automatically fitted, and form a reliable conductive path during the insertion process, avoiding the installation complexity and maintenance difficulties caused by the traditional bolt locking structure.

[0008] This invention proposes a combined structure comprising a conductive core, a connector body, an equipment end, and an outer insulating sheath. The outer insulating sheath contains a stress control tube for equalizing the electric field stress at the cable end under high-voltage conditions. The connector body is installed at the bottom of the conductive core and internally consists of a conductive sleeve, a sliding plate, a rotating wheel seat, and a locking nut disc. The locking nut disc and the drill rod are guided into a screw-in fit through a threaded hole and a helical groove. The rotating wheel seat guides the locking nut disc to move axially, and the sliding plate and the locking nut disc form a one-way locking mechanism through a ratchet structure. This ensures that the terminal automatically locks after insertion and forms a stable conductive path, giving the terminal the comprehensive capabilities of direct insertion, automatic locking, and stable conductivity, significantly improving assembly efficiency.

[0009] In a preferred embodiment, the present invention is further configured as follows: the electrical clamping member includes two clamping rods rotatably connected to each other and a control screw for controlling the deflection of the clamping rods. The clamping rods are provided with screw sleeves and are sleeved on the outside of the control screw, so that the two clamping rods can generate synchronous deflection under the rotation of the control screw, thereby clamping and fixing the outer layer of the cable conductor, ensuring stable electrical contact between the cable conductor and the conductive core, and improving the stability of current conduction.

[0010] In a preferred embodiment, the slide and the wheel seat are arranged in a ring shape and have a central ring hole for the drill rod to pass through. A spring is provided between the bottom end of the slide and the inner wall of the conductive sleeve. By providing a continuous upward thrust, the slide is kept in contact with the lock nut, ensuring that the ratchet structure remains tightly closed during the insertion process, thereby enhancing the reliability of one-way locking.

[0011] In a preferred example, the locking ratchet on the surface of the slide plate and the abutting plate on the bottom surface of the lock nut plate are both circumferentially distributed ratchet structures. Each ratchet has a right-angled triangular cross section and extends radially, so that the rotation direction of the lock nut plate during insertion can slide through the ratchet, while the rotation in the opposite direction is restricted by the ratchet locking, ensuring that the lock nut plate has a unidirectional locking capability and maintaining a long-term stable connection of the terminal.

[0012] In a preferred embodiment, a piston ring is further configured to be provided on the outer periphery of the slide and slide against the inner wall of the conductive sleeve to control the radial stability of the slide during axial movement, reduce slide wobble, maintain the engagement stability of the locking structure, and improve the overall locking reliability of the terminal.

[0013] In a preferred embodiment, the conductive sleeve is further configured such that a sealing cap is provided at the bottom, the sealing cap has a through hole for the drill rod to pass through, and an adhesive film or aluminum foil film is attached to the inside of the through hole to seal and protect the connector structure when the terminal is not in use, preventing dust, moisture and impurities from entering the interior of the connector, thereby improving the service life and environmental adaptability of the terminal.

[0014] In a preferred embodiment, the guide pins on the surface of the rotary seat are arranged vertically, and the surface of the lock nut disc has a groove that matches the guide pins. This allows the lock nut disc to slide axially under the restriction of the guide pins during insertion and to cooperate with the spiral groove of the drill rod to form a screw-in action. This ensures that the lock nut disc has a stable and controllable spiral assembly path, improving the smoothness and reliability of the insertion action.

[0015] In a preferred embodiment, the wheel seat is further configured such that a bearing is provided on its surface, and the wheel seat is rotatably mounted inside the conductive sleeve via the bearing, ensuring smooth rotation of the wheel seat during assembly and locking. This reduces rotational friction and improves the stability of the engagement process between the threaded sleeve hole and the helical groove.

[0016] In a preferred example, the conductive base is further configured as follows: it is made of a highly conductive metal material and is connected to the slide, lock nut, conductive sleeve and conductive core to form a continuous conductive path, ensuring that the terminal has low impedance and high reliability conductivity after insertion, which is suitable for high voltage and high current scenarios.

[0017] The beneficial effects achieved by this invention are as follows: 1. In this invention, by constructing an actively guided plug-in structure between the connector body and the equipment end, the terminal can be quickly assembled without additional tools during installation and disassembly. Because the conductive sleeve, locking nut, and rotating wheel seat utilize an axial sliding and one-way ratchet structure, the operator only needs to push the connector body in along the drill rod direction to automatically complete locking and conductive connection, significantly reducing installation time and improving on-site work efficiency.

[0018] 2. In this invention, the mating structure between the drill rod and the locking nut disc adopts the guiding relationship between the threaded hole and the spiral groove, so that the locking nut disc automatically generates a spiral sleeve action under the action of insertion force, achieving an effect similar to "self-tapping insertion", enabling the terminal to be directly inserted and automatically lock, which is more efficient and reliable than the traditional threaded tightening structure.

[0019] 3. In this invention, the sliding plate, lock nut plate, ratchet structure, and the composite fit relationship of the screw sleeve hole and spiral groove are used to make the lock nut plate have working characteristics similar to the screw and nut structure. During the disassembly stage, the lock can be released by simply rotating the connector body in the opposite direction, avoiding the use of large wrenches or disassembly tools, thereby achieving quick unlocking and convenient maintenance, and improving the safety and reliability of use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention; Figure 2 This is an exploded structural diagram of an embodiment of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the conductive core and connector body according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the conductive core and its surface-connected clamping component according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the slide, wheel seat, and lock nut disc structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the drill rod and locking nut structure according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the surface structure of the lock nut disc according to an embodiment of the present invention.

[0021] Figure label: 100. Conductive core; 110. Outer insulating sheath; 111. Stress control tube; 120. Electrical clamp; 121. Clamping rod; 122. Control screw; 130. Conductive base; 200. Connector body; 210. Conductive sleeve; 220. Slide plate; 230. Rotary wheel seat; 240. Locking nut plate; 221. Spring; 222. Locking ratchet; 231. Guide pin; 241. Threaded sleeve hole; 242. Abutment plate; 300. Equipment end; 310. Drill rod; 311. Spiral groove. Detailed Implementation

[0022] 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.

[0023] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0024] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing a 35kV environmentally friendly aluminum alloy inner cone terminal.

[0025] Combination Figure 1 - Figure 7As shown, the present invention provides a 35kV environmentally friendly aluminum alloy inner cone terminal, comprising a conductive core 100, a connector body 200, an equipment end 300, and an outer insulating sheath 110 sleeved around the conductive core 100 and the connector body 200. A stress control tube 111 is provided inside the outer insulating sheath 110 to achieve electric field homogenization and stress reduction at the cable end, ensuring overall insulation performance.

[0026] The conductive core 100 is used to establish an electrical connection with the cable conductor. Its bottom end is fixedly connected to the connector body 200, and a conductive transition interface is formed in the conductive path through the conductive seat 130. The connector body 200 includes components such as a conductive sleeve 210, a slide 220, a rotating wheel seat 230, and a locking nut 240, which are used to realize the functions of insertion, locking, and conductive connection.

[0027] The conductive sleeve 210 serves as the main bearing cavity, with a rotating wheel seat 230 mounted inside. A spring 221 is fixedly connected to the bottom surface of the slide 220 for pushing the slide 220 upwards. The upper surface of the slide 220 is provided with a locking ratchet 222, and the bottom surface of the lock nut 240 is provided with a stop plate 242. The two form a ratchet meshing structure, which can achieve one-way locking.

[0028] The surface of the rotating wheel seat 230 is provided with multiple guide pins 231 to limit the controlled movement of the lock nut disc 240 in the axial direction under the action of insertion force. The inner side of the lock nut disc 240 is provided with a threaded sleeve hole 241, the cross-sectional shape of which is adapted to the drill rod 310 on the surface of the equipment end 300, for threaded guiding movement during installation.

[0029] The equipment end 300 is installed and fixed at the equipment interface, and the drill rod 310 is welded or fixedly connected to its surface. The surface of the drill rod 310 is provided with a spiral groove 311, which engages with the threaded sleeve hole 241 during the insertion process to form a spiral guide, so that the lock nut disc 240 is sleeved axially under the constraint of the guide pin 231.

[0030] To ensure a secure clamping of the cable end, the present invention also includes a power-connecting clamp 120. The power-connecting clamp 120 includes two clamping rods 121 rotatably connected to each other and a control screw 122 for controlling the deflection of the clamping rods 121. Screw sleeves mounted on the surface of the clamping rods 121 are fitted onto the outside of the control screw 122. When the operator rotates the control screw 122, the two clamping rods 121 clamp or loosen relative to each other around the control screw 122, thereby clamping and fixing the cable conductor externally and ensuring reliable conductive contact between the cable and the conductive core 100.

[0031] In this embodiment, both the slide 220 and the wheel seat 230 are arranged in a ring shape, with an annular through hole in the central area for the drill rod 310 to pass through, so that the insertion action can be performed along the same axis. The spring 221 is fixed to the bottom inner side of the conductive sleeve 210. By pushing the slide 220 upward, the slide 220 is kept in contact with the surface of the lock nut 240, thereby ensuring stable engagement of the ratchet structure.

[0032] In this embodiment, both the locking ratchet 222 and the abutment disc 242 are composed of multiple ratchet teeth distributed along the circumferential direction. Each ratchet tooth has a right-angled triangular cross-section and extends radially along the surfaces of the slide plate 220 and the locking nut disc 240. When the locking nut disc 240 is screwed into the drill rod 310, the ratchet structure allows it to screw in; in the opposite direction, the ratchet structure prevents the locking nut disc 240 from loosening through the right-angled side surfaces, thereby achieving unidirectional locking and ensuring the mechanical stability of the terminal connection.

[0033] In this embodiment, a piston ring is provided on the outer periphery of the slide 220. The outer side of the piston ring forms a sliding contact with the inner wall of the conductive sleeve 210, which can effectively control the radial stability of the slide 220 during axial movement, reduce movement vibration, and improve the working reliability of the locking structure.

[0034] In this embodiment, a sealing cap is provided on the bottom surface of the inner cavity of the conductive sleeve 210, and a through hole is formed on the sealing cap for the drill rod 310 to pass through. An adhesive film or aluminum foil film is attached to the inside of the through hole to achieve sealing protection when the connector body 200 is not in use, preventing dust, moisture and other substances from entering the interior of the connector body structure and extending the service life of the terminal component.

[0035] In this embodiment, the guide pin 231 is vertically arranged on the surface of the rotating wheel seat 230, and the surface of the lock nut disc 240 is provided with a sliding groove that matches the guide pin 231, so that the lock nut disc 240 slides stably along the trajectory specified by the guide pin 231 during the insertion process, realizing a combined action of axial movement and spiral screwing.

[0036] In this embodiment, the rotating seat 230 is mounted inside the conductive sleeve 210 by a bearing disposed on its surface, so that the rotating seat 230 can rotate smoothly relative to the conductive sleeve 210, which is beneficial to the rotation and sliding process of the locking nut disc 240 during the insertion process.

[0037] In this embodiment, the conductive base 130 is made of a highly conductive metal material, forming a key node in the conductive path. The slide plate 220, locking nut plate 240, conductive sleeve 210, conductive base 130, and conductive core 100 form a continuous conductive path. After the locking nut plate 240 is fitted onto the drill rod 310, a complete conductive link is formed between the equipment end and the cable end, realizing stable transmission of high current.

[0038] Working principle and usage process of this invention: The device end 300 and the drill rod 310 are pre-welded and fixed during the device manufacturing stage. The surface of the drill rod 310 is provided with a spiral groove 311 for mating with the threaded hole 241 of the locking nut 240. During installation, the operator holds the conductive core 100 and the connector body 200, aligns the bottom through hole of the conductive sleeve 210 with the drill rod 310, and inserts it. As the drill rod 310 gradually enters the connector body 200, the threaded hole 241 is passively rotated under the guidance of the spiral groove 311 and moves axially under the restriction of the guide pin 231, so that the locking nut 240 is spirally sleeved and fastened to the surface of the drill rod 310. The connection process keeps the slide plate 220 in contact with the locking nut plate 240 under the thrust of the spring 221, while the locking ratchet 222 engages with the abutment plate 242 to form a one-way locking structure, thereby creating a stable conductive path between the conductive sleeve 210, the conductive seat 130 and the conductive core 100.

[0039] The cable is secured by a power-connecting clamp 120. The power-connecting clamp 120 consists of a clamping rod 121 and a control screw 122. By adjusting the control screw 122, the clamping rod 121 is deflected, thereby applying a clamping force to the cable end and achieving reliable contact between the cable conductor and the conductive core 100.

[0040] During operation, the spring 221 continuously keeps the slide plate 220 and the lock nut plate 240 pressed together, and the locking ratchet 222 inhibits the reverse loosening of the lock nut plate 240, ensuring the long-term locking stability and electrical reliability of the terminal in outdoor environments.

[0041] During disassembly, the operator only needs to manually rotate the connector body 200 in the reverse direction. The locking ratchet 222 slips out during the reverse rotation, causing the locking nut disc 240 to gradually exit the engagement path of the threaded sleeve hole 241, thereby disengaging the locking nut disc 240 from the drill rod 310 and completing the quick disassembly of the connector body 200, which is convenient for maintenance and replacement.

[0042] 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.

[0043] 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 35kV environmentally friendly aluminum alloy inner cone terminal, characterized in that, include: Conductive core (100), connector (200), equipment end (300) and outer insulating sleeve (110) sleeved around the outer periphery of the conductive core (100) and the connector (200). The connector body (200) is fixedly connected to the bottom end of the conductive core (100). The connector body (200) includes a conductive sleeve (210), a slide plate (220), a rotating wheel seat (230), and a lock nut plate (240). A spring (221) is fixedly installed on the bottom surface of the slide plate (220), and the top surface of the slide plate (220) and the bottom surface of the lock nut plate (240) are respectively provided with locking ratchet teeth (222) and abutting teeth disc (242) that abut against each other. The rotating wheel seat (230) is rotatably installed on the inner side of the conductive sleeve (210), and a threaded sleeve hole (241) is opened on the inner side of the lock nut plate (240). The device end (300) is installed and fixed at the device interface, and a drill rod (310) is fixedly connected to its surface. The surface of the drill rod (310) is provided with a spiral groove (311), and the shape and size of the screw sleeve hole (241) are adapted to the drill rod (310).

2. The 35kV environmentally friendly aluminum alloy inner cone terminal according to claim 1, characterized in that, The inner side of the outer insulating sheath (110) is provided with a stress control tube (111).

3. The 35kV environmentally friendly aluminum alloy inner cone terminal according to claim 1, characterized in that, It also includes an electrical clamp (120), which includes two clamp rods (121) rotatably connected to each other, and a control screw (122) for controlling the relative deflection of the two clamp rods (121). A screw sleeve is rotatably mounted on the surface of the clamp rods (121) and sleeved on the surface of the control screw (122).

4. A 35kV environmentally friendly aluminum alloy inner cone terminal according to claim 1, characterized in that, Both the slide (220) and the wheel seat (230) are annular structures, and their surfaces are provided with annular holes for the drill rod (310) to pass through. The bottom end of the spring (221) is fixed to the inner side of the conductive sleeve (210) to drive the slide (220) to move toward the lock nut disc (240). The surface of the wheel seat (230) is also provided with several guide pins (231) to guide the lock nut disc (240) to move axially.

5. A 35kV environmentally friendly aluminum alloy inner cone terminal according to claim 4, characterized in that, The guide pin (231) is vertically disposed on the surface of the wheel seat (230), and the surface of the lock nut disc (240) is provided with a sliding groove that is compatible with the guide pin (231) for guiding the lock nut disc (240) to move axially relative to the wheel seat (230).

6. A 35kV environmentally friendly aluminum alloy inner cone terminal according to claim 1, characterized in that, The locking ratchet (222) and the abutting plate (242) are both composed of several ratchets distributed along the circumferential direction. The cross-section of each ratchet is a right-angled triangle and extends radially along the slide plate (220) and the locking plate (240) to restrict the locking plate (240) from rotating in one direction.

7. A 35kV environmentally friendly aluminum alloy inner cone terminal according to claim 1, characterized in that, The outer periphery of the slide (220) is provided with a piston ring, and the piston ring slides against the inner side of the conductive sleeve (210).

8. A 35kV environmentally friendly aluminum alloy inner cone terminal according to claim 1, characterized in that, The bottom surface of the inner cavity of the conductive sleeve (210) is provided with a sealing cover, and the surface of the sealing cover is provided with a through hole for the drill rod (310) to pass through. The inner side of the through hole is covered with an adhesive film or aluminum foil film to achieve sealing protection when the connector body (200) is in the non-use stage.

9. A 35kV environmentally friendly aluminum alloy inner cone terminal according to claim 1, characterized in that, The surface of the rotating wheel seat (230) is provided with a bearing, and it is rotatably mounted on the inner side of the conductive sleeve (210) through the bearing.

10. A 35kV environmentally friendly aluminum alloy inner cone terminal according to claim 1, characterized in that, The surface of the connector body (200) is provided with a conductive seat (130) that is connected to the bottom end of the conductive core (100). The conductive seat (130) is a high conductivity metal component. The slide plate (220), lock nut plate (240), conductive sleeve (210), conductive seat (130) and conductive core (100) form a conductive connection path.

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