Environment-friendly aluminum alloy inner cone cable terminal

Abstract

The utility model discloses an environmental protection aluminum alloy inner cone cable terminal, including cable sleeve head, terminal cover, expansion sleeve, spring, epoxy sleeve and a plurality of deformation strips, and the expansion sleeve is slidably connected to the outer surface of the terminal cover, and the inner side inclined surface of a plurality of metal deformation strips is slidably contacted, and the surface of terminal cover is equipped with the sliding slot, and the inner wall of expansion sleeve is equipped with the joint in the sliding slot, and one end of cable sleeve head is equipped with the taper head part matched with the joint, the spring is arranged between the terminal cover and expansion sleeve, and is used for pushing the expansion sleeve forward during the assembly process. When assembling, the taper head part is embedded with the joint and is positioned, and the expansion sleeve drives the deformation strip to expand outward under the spring pushing, and then the sealing expansion of the epoxy sleeve is realized. The structure can realize the automatic locking, reliable conduction and high -efficient sealing between the cable and the terminal, has the characteristics such as simple assembly, compact structure, reliable sealing, excellent insulation protection performance, is suitable for the terminal connection scene of medium -high voltage cable.

Description

Technical Field

[0001] This utility model relates to the field of cable connection technology, specifically to an environmentally friendly aluminum alloy inner cone cable terminal. Background Technology

[0002] Cable terminals, as transitional connection components between cables and equipment / lines in power systems, play a crucial role in ensuring electrical continuity, safe insulation, and structural sealing. Especially in high-voltage or medium-voltage systems, cable terminals not only bear the function of conducting electricity but also must possess good pressure resistance, sealing performance, and mechanical strength to meet the connection requirements of long-term operation and complex environments.

[0003] Common cable termination connection structures currently include: Threaded locking connection structure: This structure uses a metal connector with threaded ends to crimp the cable, and then uses an external housing or sealing ring to achieve structural fixation and sealing protection. However, this structure has a complex assembly process, requires high installation accuracy, and is prone to loosening of the threads due to thermal expansion and contraction or vibration during long-term operation, affecting the stability of the electrical connection.

[0004] Adhesive-sealed cold-shrink terminals: These use heat-shrink or cold-shrink tubing and filler adhesive to wrap the cable ends, achieving waterproof insulation. While suitable for outdoor environments, the adhesive is prone to aging, operation is greatly affected by temperature and humidity, long-term reliability is insufficient, and disassembly and maintenance are inconvenient.

[0005] Split-type internal plug-in structure: Some structures achieve contact and fit with the cable core through the plug-in of a metal conical sleeve, but it mostly relies on manual positioning and screw tightening, resulting in problems such as poor assembly consistency, loose structure, and poor sealing.

[0006] Regarding the existing cable termination products mentioned above, the following main problems still exist in practical applications: The locking structure is complex and the installation operation is cumbersome: Traditional cable connectors mostly rely on mechanical clamping or screw fixing, which requires multiple assembly steps and precise alignment, resulting in low installation efficiency and large operational errors. The sealing effect is greatly affected by human factors: the sealant or heat shrink tubing seal depends on the construction process and is easily affected by environmental humidity, operation methods, etc., which can lead to problems such as poor sealing and water ingress and corrosion. Poor connection reliability and insufficient vibration fatigue resistance: Common connection types are prone to loosening, poor contact, breakdown discharge and other hidden dangers during long-term operation, which affect the stability of the system. Non-reusable and difficult to maintain and replace: Some structures are designed to be molded in one piece, making disassembly and repair difficult and increasing operating costs.

[0007] In summary, existing cable terminal structures still have significant room for improvement in terms of installation efficiency, structural stability, airtightness, and operational reliability. Therefore, there is an urgent need to propose a cable terminal structure that is simple in structure, automatically locks, reliably seals, and is easy to install and maintain, in order to meet the engineering application requirements of modern power distribution systems in terms of high reliability and adaptability. Utility Model Content

[0008] This utility model aims to solve one of the technical problems existing in the prior art or related technologies.

[0009] Therefore, the technical solution adopted by this utility model is: an environmentally friendly aluminum alloy inner cone cable terminal, including: cable end cap, terminal sleeve, expansion sleeve, spring, epoxy sleeve and several deformation strips. The various structures cooperate with each other, and achieve adaptive locking and sealing fixation through elastic automatic advancement and inclined structure collaboration. The overall structure is compact, easy to assemble and has excellent sealing performance.

[0010] In a preferred embodiment, the environmentally friendly aluminum alloy inner tapered cable terminal includes: a cable end cap, a terminal sleeve, an epoxy sleeve, an expansion sleeve, and several deformation strips. Specifically: the expansion sleeve is slidably fitted onto the outer surface of the terminal sleeve; the deformation strips are fixed to the surface of the terminal sleeve, and one end of the expansion sleeve slides against the inner inclined surface of the deformation strip; the surface of the terminal sleeve has several grooves, and the inner side of the expansion sleeve has multiple engagement ports arranged through the grooves; the front end of the cable end cap has a tapered head that can engage with the engagement ports; a spring is fitted onto the outer surface of the terminal sleeve and pushes the expansion sleeve axially towards the tapered head during assembly.

[0011] Specifically, the above structure automatically pushes the expansion sleeve to lock the cone head through the spring, and drives the deformation strip to open, so as to realize the mechanical clamping, electrical connection and structural sealing of the end, avoiding the problem of relying on manual force and screw positioning in the traditional structure, and improving assembly efficiency and connection reliability.

[0012] In a preferred example, the cable sleeve is an aluminum hollow sleeve structure that can precisely fit with the cable core during the press-fitting process; its front end forms a cone-shaped head with an annular groove on the cone surface for reliable engagement with the joint of the inner wall of the expansion sleeve.

[0013] Specifically, an inner cone locking relationship is formed between the cone head and the joint, which ensures accurate positioning of the cable end, reliable conduction, and prevents it from loosening under vibration or temperature changes, thus improving the safety of long-term operation.

[0014] In a preferred example, the deformation strip is a metal spring structure, one end of which is fixed to the front end face of the terminal sleeve by welding or screws, and multiple deformation strips are evenly distributed along the circumference of the terminal sleeve.

[0015] The inner side of each deformation strip forms a beveled structure that contacts the outer wall of the end of the expansion sleeve; During axial movement, the expansion sleeve pushes the deformation strip to expand radially outward.

[0016] Specifically, the structure uses a sloped force transmission method to automatically unfold and tighten the metal deformation strips to achieve mechanical clamping and sealing, thereby enhancing the support effect on the outer protective structure (such as epoxy sleeve).

[0017] In a preferred embodiment, a locking relationship is formed between the engagement port and the conical head. The conical head is inserted into the engagement port to form a limiting fit, preventing axial slippage; the annular groove provides a stable locking point, ensuring reliable connection retention.

[0018] Specifically, this structure achieves precise positioning and high-strength locking of the cable sleeve and expansion sleeve without the need for screws or welding, reducing assembly difficulty and improving the tensile strength of the connection.

[0019] In a preferred example, the spring is a helical compression spring, with one end abutting against the limiting boss of the end sleeve and the other end abutting against the tail of the expansion sleeve.

[0020] Specifically, the spring structure provides a stable axial thrust during assembly, enabling the expansion sleeve to move forward automatically and engage in positioning, while simultaneously tightening the deformation strip, effectively improving assembly efficiency and reliability, and making it particularly suitable for mass industrial pre-assembly.

[0021] In a preferred example, the groove is an axially extending strip structure, preferably three or more, arranged symmetrically along the circumference of the end sleeve.

[0022] Specifically, this structure provides accurate guidance for the expansion sleeve to slide, ensuring that it slides smoothly and accurately along the end sleeve, avoiding offset and jamming, and improving assembly accuracy.

[0023] In a preferred example, the outer surface of the terminal sleeve is provided with a plurality of radially arranged locking screw holes for installing fastening screws for connection with the equipment interface board, and the end of the terminal sleeve is also provided with through holes or sleeve holes adapted to electrical connectors.

[0024] Specifically, this structure enhances the connection strength and maintainability between the terminal set and external equipment, and allows for flexible configuration of conductive terminals according to actual applications, thereby improving product versatility and engineering adaptability.

[0025] In a preferred example, the epoxy sleeve is a sleeve-shaped component made of epoxy resin composite material, which is fitted over the expansion sleeve and covers the entire deformation strip area.

[0026] Specifically, epoxy sleeves provide insulation protection and corrosion resistance, while forming a certain pre-tight seal after the deformation strip is stretched, which helps to improve the overall protection level and environmental resistance of the cable terminal.

[0027] The beneficial effects achieved by this utility model are as follows: 1. In this utility model, by setting an inner conical mating structure between the conical head and the joint, and combining the spring to push the expansion sleeve to slide along the axis, the automatic positioning and locking between the cable sleeve and the terminal component is realized, avoiding the defects of complex assembly and poor contact of traditional threaded or welded structures, and significantly improving the convenience of installation and the reliability of electrical contact.

[0028] 2. In this utility model, an expansion sleeve combined with a deformation strip structure is adopted to achieve radial support and expansion of the external epoxy sleeve. Highly reliable sealing can be achieved without the need for external tools or glue injection. At the same time, it takes into account good insulation and corrosion resistance, improving the protection level and long-term service performance of the entire cable terminal. It is particularly suitable for cable connection applications in harsh environments such as high humidity, high salt spray, and heavy pollution. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present utility model; Figure 2 This is a cross-sectional structural diagram of one embodiment of the present invention; Figure 3 This is a schematic diagram of the cable sleeve in a separated state according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the terminal sleeve, expansion sleeve, and deformation strip structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the expansion sleeve and deformation strip structure according to an embodiment of the present invention.

[0030] Figure label: 1. Cable sleeve; 11. Conical head; 2. Terminal sleeve; 21. Spring; 22. Slide groove; 3. Epoxy sleeve; 4. Expansion sleeve; 41. Joint; 5. Deformation strip. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 of the present utility model can be combined with each other.

[0032] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of this invention.

[0033] The following describes, with reference to the accompanying drawings, some embodiments of the present invention, providing an environmentally friendly aluminum alloy inner cone cable terminal.

[0034] Combination Figures 1-5 As shown, the present invention provides an environmentally friendly aluminum alloy inner cone cable terminal, comprising: a cable sleeve 1, a terminal sleeve 2, an epoxy sleeve 3, an expansion sleeve 4, and several deformation strips 5 fixed to the surface of the terminal sleeve 2.

[0035] The expansion sleeve 4 is a cylindrical structure, and its outer wall is in sliding contact with the inner side of the deformation strip 5, which can be pushed along the axial direction to cause the deformation strip to be radially outward. The outer surface of the terminal sleeve 2 is provided with several sliding grooves 22, and the inner side of the expansion sleeve 4 is provided with multiple joints 41, which pass through and are inserted into the sliding grooves 22, thereby guiding the expansion sleeve to slide axially on the surface of the terminal sleeve; the front end of the cable sleeve 1 is provided with a conical head 11, which engages with the joints 41; a spring 21 is sleeved on the surface of the terminal sleeve 2, one end of which abuts against the tail of the expansion sleeve 4, which is used to push the expansion sleeve forward during the assembly process to achieve automatic pre-tightening of the structure.

[0036] Technical effect: The above structure achieves self-locking clamping and conductive cooperation of cable sleeve, expansion sleeve and deformation strip through spring pushing, sliding groove guidance and cone head positioning, which improves the stability and reliability of terminal connection.

[0037] In this embodiment, the cable sleeve 1 is made of aluminum alloy and has a hollow structure. It is used to press and fix the cable conductor to the outer layer during installation to ensure conductivity and contact stability.

[0038] Its end is provided with a conical head 11, which expands outward into a conical structure; the outer surface of the conical head is provided with an annular groove structure, which is used to fit and lock with the joint 41 on the inner side of the expansion sleeve 4.

[0039] Technical benefits: The aluminum alloy material has good electrical conductivity, is lightweight and environmentally friendly. The annular groove structure of the cone head and the expansion sleeve can ensure that it will not loosen after pressing, thus improving the safety of long-term operation.

[0040] like Figure 4 and Figure 5 As shown, the deformation strip 5 is a metal spring structure, with one end fixed to the end of the terminal sleeve 2 by welding, screws or slots, and the other end extending freely.

[0041] Several deformation strips 5 are symmetrically and evenly distributed along the circumference of the end sleeve; the inner side of each deformation strip forms an inclined contact surface for sliding contact with the front end of the expansion sleeve 4; when the expansion sleeve moves forward, it pushes the deformation strip to produce an elastic outward displacement.

[0042] Technical benefits: The deformable bar structure achieves radial expansion without the need for complex control mechanisms, while providing rebound force to form a continuous clamping state, effectively improving assembly convenience and contact reliability.

[0043] In this embodiment, the engagement port 41 is located on the inner wall of the expansion sleeve 4, and its size matches that of the conical head 11. During assembly, the conical head is inserted into the expansion sleeve and embedded in the engagement port; after engagement, an axial locking relationship is formed between the conical head and the engagement port to prevent loosening.

[0044] Technical benefits: The snap-fit ​​relationship between the joint and the cone head achieves high-strength positioning without the need for threads or welding, simplifying the process while ensuring safe use.

[0045] In this embodiment, the spring 21 is a helical compression spring, installed between the terminal sleeve 2 and the expansion sleeve 4. One end of the spring abuts against the limiting ring of the terminal sleeve, and the other end abuts against the tail of the expansion sleeve; during assembly, the spring force continuously pushes the expansion sleeve 4 forward.

[0046] Technical benefits: The spring structure provides automatic propulsion force, enabling automatic sliding and positioning of the expansion sleeve, eliminating the need for external tools and improving assembly efficiency and consistency.

[0047] In this embodiment, the terminal sleeve 2 preferably has three or more grooves 22, which are arranged to extend axially. Each groove is a strip-shaped opening used to accommodate the sliding guide of the joint 41; multiple grooves are symmetrically distributed in the circumferential direction to improve the stability and coaxiality of the expansion sleeve movement.

[0048] Technical benefits: The groove structure ensures that the expansion sleeve is accurately guided along the surface of the end sleeve, avoiding eccentric jamming and improving the fitting accuracy.

[0049] In this embodiment, the outer surface of the terminal sleeve 2 may be provided with multiple radially arranged locking screws for fixed connection with the equipment end flange, terminal block or structural component; the front end of the sleeve body is provided with a sleeve hole structure, which can be equipped with conductive terminals, threaded connectors and other interfaces to realize reliable docking of the electrical system.

[0050] Technical benefits: The end structure enhances the mechanical connection strength between the terminal and external equipment, improves vibration resistance and tensile strength, and meets the installation requirements of high-voltage cables.

[0051] In this embodiment, the epoxy sleeve 3 is fitted over the expansion sleeve 4 and covers the entire deformation strip 5 area. The material is a rubber composite material, which has good insulation and corrosion resistance and is deformable; the sleeve can produce a small amount of elastic deformation after the deformation strip is supported, so as to achieve an interference seal with the equipment end.

[0052] Technical benefits: This epoxy sleeve structure provides secondary protection for the entire terminal component, improving its environmental resistance, aging resistance and insulation safety, and is suitable for harsh application scenarios such as outdoor, humid and highly corrosive environments.

[0053] Working principle and usage process of this utility model: This utility model provides an environmentally friendly aluminum alloy inner cone cable terminal, which achieves stable connection and electrical reliability sealing between the cable and the terminal through the cooperation of the inner cone locking mechanism and the external expansion sleeve pressing structure. It is widely applicable to high voltage or medium voltage cable joint systems.

[0054] Preparation before assembly: First, the cable core is inserted into the cable sleeve 1. The cable sleeve is an aluminum hollow structure with a conical head 11 at the front end for positioning and locking with the expansion sleeve 4. The outer side of the conical head 11 has an annular groove for fitting and engaging with the inner joint 41 of the expansion sleeve 4.

[0055] After the cable sleeve 1 is inserted into the terminal sleeve 2, the front end of its conical head 11 abuts against the joint 41 of the expansion sleeve 4, forming a nested structure. The joint 41 can slide inside the groove 22, thereby realizing the relative axial movement of the expansion sleeve 4 and the deformation strip 5.

[0056] Spring 21 is positioned between the terminal sleeve 2 and the expansion sleeve 4, with one end elastically abutting against the tail of the expansion sleeve 4. During assembly, the spring pushes the expansion sleeve to slide axially toward the conical head. As the expansion sleeve 4 is pushed forward, it supports several external deformation strips 5 outward. As the expansion sleeve 4 moves forward under force, it pushes the inner side of the deformation strips to expand outward, thereby achieving radial expansion of the epoxy sleeve 3 and improving the sealing effect with the equipment end.

[0057] After the entire assembly is completed, the cable sleeve 1 and the expansion sleeve 4 are firmly mechanically locked and electrically connected through the tapered fit and the pre-tightening force of the deformation strip; at the same time, the outer epoxy sleeve 3 is fitted around the expansion sleeve 4, which can provide good insulation and corrosion protection and adapt to complex operating environments.

[0058] The end of the terminal sleeve 2 can also be fitted with the equipment interface structure through a locking screw to achieve a fixed connection to the external equipment end; the sleeve hole structure can be equipped with conductive terminals or threaded fasteners according to wiring requirements.

[0059] 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.

[0060] Although embodiments of the present 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 present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An environmentally friendly aluminum alloy inner cone cable terminal, characterized in that, The cable sleeve (1), terminal sleeve (2), epoxy sleeve (3), expansion sleeve (4), and several deformation strips (5) fixed to the surface of the terminal sleeve (2); the expansion sleeve (4) is slidably sleeved on the surface of the terminal sleeve (2), and one end of it slides against the inner side of the deformation strip (5); several grooves (22) are opened on the surface of the terminal sleeve (2), and the inner side of the expansion sleeve (4) is provided with a joint (41) that passes through the groove (22); one end of the cable sleeve (1) is provided with a conical head (11) that engages with the joint (41); a spring (21) is sleeved on the surface of the terminal sleeve (2), and one end of the spring (21) elastically abuts against the end of the expansion sleeve (4).

2. The environmentally friendly aluminum alloy inner cone cable terminal according to claim 1, characterized in that, The cable sleeve (1) is an aluminum hollow sleeve structure, used to be sleeved on the end of the cable during the press fitting process; the cone head (11) is a cone-shaped structure with outward expansion at the end, and its outer surface is provided with an annular groove that matches the joint (41).

3. The environmentally friendly aluminum alloy inner cone cable terminal according to claim 1, characterized in that, The deformation strip (5) is a metal spring sheet structure, one end of which is fixedly connected to the end of the terminal sleeve (2). The several deformation strips (5) are evenly distributed along the circumference of the terminal sleeve (2), and their inner side has a sloping structure for sliding contact with the end of the expansion sleeve (4).

4. The environmentally friendly aluminum alloy inner cone cable terminal according to claim 1, characterized in that, The joint (41) and the cone head (11) form a locking fit, which can position the relative position of the expansion sleeve (4) and the cable sleeve (1) in the axial direction.

5. The environmentally friendly aluminum alloy inner cone cable terminal according to claim 1, characterized in that, The spring (21) is a helical compression spring, and its elasticity is used to push the expansion sleeve (4) to slide axially toward the cone head (11).

6. The environmentally friendly aluminum alloy inner cone cable terminal according to claim 1, characterized in that, The groove (22) is an axially extending strip-shaped groove, with no less than three, and is symmetrically arranged in the circumferential direction of the end sleeve (2).

7. The environmentally friendly aluminum alloy inner cone cable terminal according to claim 1, characterized in that, The surface of the terminal sleeve (2) is provided with a plurality of radially arranged locking screws, and the end of the terminal sleeve (2) is provided with a sleeve hole for connecting and fixing with the device end.

8. The environmentally friendly aluminum alloy inner cone cable terminal according to claim 1, characterized in that, The epoxy sleeve (3) is fitted over the outside of the expansion sleeve (4) to provide insulation and improve corrosion resistance.

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