Miniaturized cable heads

Abstract

This utility model belongs to the field of cable connection technology, and particularly relates to miniaturized cable heads; one type of miniaturized cable head includes: an intermediate joint, which is hollow inside; a shielding tube located on the inner wall of the intermediate joint, and the inner wall is provided with several contact points; a connecting tube, the two ends of which are respectively sleeved at the connection of two cable cores, and the outer wall abuts against the contact points; the shielding tube and the connecting tube adopt an equipotential design to effectively extend the electrical creepage distance; by setting several contact points in the shielding tube and the equipotential design of the shielding tube and the connecting tube, the electrical creepage distance is effectively extended, creepage accidents are greatly reduced, and the resistance to electrical breakdown is enhanced, forming a basic safety improvement.

Description

Technical Field

[0001] This utility model belongs to the field of cable connection technology, and in particular relates to miniaturized cable heads. Background Technology

[0002] In high-voltage cable systems, the cable head is a key component connecting the cable and the equipment, and its reliability and performance directly affect the safety and efficiency of power transmission.

[0003] In related technologies, traditional cable heads (such as...) Figure 1 As shown, cable head accidents are mainly divided into two categories: electrical breakdown and creepage. Electrical breakdown is limited by the breakdown strength of the insulation material, but creepage accidents are more common, where current leaks from the shielding tube port of the intermediate joint along the mating interface between the cable head and the cable to the stress cone port. Since the breakdown strength of the mating interface is only 1 / 5 to 1 / 3 of the breakdown strength of the insulation material, creepage accidents account for a higher proportion.

[0004] To address the risk of creepage, traditional designs require increasing the horizontal distance between the stress cone and the shielding tube to extend the creepage path. However, this results in an excessively large overall cable head size, increasing material costs and space requirements, and is also unsuitable for compact on-site construction environments.

[0005] Therefore, there is an urgent need to develop a miniaturized cable head to solve the above-mentioned technical problems.

[0006] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute information related to the technology. Utility Model Content

[0007] This disclosure provides at least one miniaturized cable head.

[0008] In a first aspect, embodiments of this disclosure provide a miniaturized cable head, comprising: In one alternative implementation, the intermediate joint is hollow inside; The shielding tube is located on the inner wall of the intermediate joint, and several contact points are provided on the inner wall; The connecting tube has its two ends respectively fitted onto the connection point of the two cable cores, and its outer wall abuts against the contact point; The shielding tube is designed to be at the same potential as the connecting tube through several contact points on its inner wall, so as to effectively extend the electrical creepage distance.

[0009] In one alternative embodiment, at least two of the contact points are axially arranged along the inner wall of the shielding tube.

[0010] In one alternative implementation, each of the contact points is circumferentially surrounded by the inner wall of the shielding tube in a 360° radius.

[0011] In one alternative embodiment, a plurality of the contact points are arranged at equal intervals along the circumferential direction of the inner wall of the shielding tube.

[0012] In one alternative embodiment, the axial length of the shielding tube is 3-4 times the protruding length of the cable core.

[0013] In one alternative embodiment, a cavity is provided between the plurality of contact points to reduce the clamping force during cable core assembly.

[0014] In one alternative implementation, several of the contact points help prevent structural deformation during the production of the shielding tube.

[0015] The beneficial effects of this utility model are that it provides a miniaturized cable head. By setting several contact points inside the shielding tube and the equipotential design of the shielding tube and the connecting tube, the creepage distance of electrical appliances is effectively extended, creepage accidents are greatly reduced, and the resistance to electrical breakdown is enhanced, thus improving basic safety.

[0016] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention are realized and obtained through the structures particularly pointed out in the description and the accompanying drawings.

[0017] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the cable head connection status in the prior art; Figure 2 A front view of a miniaturized cable head provided in an embodiment of this disclosure; Figure 3 A front axial sectional view of an intermediate joint provided in an embodiment of this disclosure; Figure 4 A radial sectional front view of an intermediate joint provided in an embodiment of this disclosure; Figure 5 A front cross-sectional view of a cable head provided in an embodiment of this disclosure.

[0020] In the picture: 1. Intermediate joint; 11. Joint insulation; 12. Joint external shield; 13. Joint stress cone; 2. Shielding tube; 20. Contact point; 3. Connecting pipe; 4. Cable head; 41. Semiconductor layer; 42. Cable insulation; 43. Cable core. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0023] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify the entire list of elements when following a list of elements, rather than individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0024] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0025] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0026] Research has revealed that in high-voltage cable systems, the cable head is a critical component connecting the cable and the equipment, and its reliability and performance directly affect the safety and efficiency of power transmission.

[0027] In related technologies, traditional cable heads (such as...) Figure 1 As shown, cable head accidents are mainly divided into two categories: electrical breakdown and creepage. Electrical breakdown is limited by the breakdown strength of the insulation material, but creepage accidents are more common, where current leaks from the shielding tube port of the intermediate joint along the mating interface between the cable head and the cable to the stress cone port. Since the breakdown strength of the mating interface is only 1 / 5 to 1 / 3 of the breakdown strength of the insulation material, creepage accidents account for a higher proportion.

[0028] To address the risk of creepage, traditional designs require increasing the horizontal distance between the stress cone and the shielding tube to extend the creepage path. However, this results in an excessively large overall cable head size, increasing material costs and space requirements, and is also unsuitable for compact on-site construction environments.

[0029] Therefore, there is an urgent need to develop a miniaturized cable head to solve the above-mentioned technical problems.

[0030] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] The following detailed description, with reference to the accompanying drawings, describes some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] like Figures 2 to 5 As shown, at least one embodiment provides a miniaturized cable head 4, comprising: Intermediate joint 1 is hollow inside. Intermediate joint 1 includes: joint insulation 11, an outer shielding layer 12, and joint stress cones 13. The joint insulation 11 is used to wrap and protect the internal components. The joint insulation 11 is located inside the outer shielding layer 12. There are two joint stress cones 13, respectively located on the inner rings at both ends of the joint insulation 11, to enhance insulation strength and the uniformity of electric field distribution. In traditional designs, excessively long joints can easily lead to deformation and installation difficulties. This embodiment reduces the axial length of the joint to 3-4 times the protruding length of the standard cable core 43 through miniaturization. This not only reduces material costs but also improves construction adaptability.

[0034] Reference Appendix Figure 5 The cable head 4 includes, from the inside out, a cable core 43, a cable insulation 42, and a semi-conductive layer 41. The cable core 43 is adapted to be inserted into the connecting tube 3.

[0035] Reference Appendix Figure 3 The shielding tube 2, located on the inner wall of the intermediate joint 1, is made of a semi-conductive material (such as a copper-nickel alloy) to provide electric field shielding. Several contact points 20 are provided on the inner wall. During the production of the cable head 4, rubber materials are prone to deformation; this embodiment uses multiple contact points 20 to ensure the structural stability of the intermediate joint 1 during production. The connecting tube 3 is fitted at both ends of the connection between the two cable cores 43, with its outer wall abutting against the contact points 20. The outer diameter of the connecting tube 3 is slightly smaller than the inner diameter of the shielding tube 2, forming multi-point electrical contact through the contact points 20, avoiding the electric field concentration problem of traditional single-point contact. The shielding tube 2 and the connecting tube 3 are designed to be at the same potential to effectively extend the electrical creepage distance. In industry practice, the equipotential design effectively extends the electrical creepage distance, allowing the axial length of the shielding tube 2 to be shortened to 3-4 times the protruding length of the cable core 43, which aligns with the industry's miniaturization trend.

[0036] In this embodiment, at least two points are arranged along the inner wall of the shielding tube 2 using multiple contact points 20, and each point surrounds the inner wall of the shielding tube 2 360° in the circumferential direction. In this embodiment, each contact point 20 surrounds the inner wall of the shielding tube 2 360 degrees.

[0037] In one optional embodiment, at least two of the plurality of contact points 20 are arranged along the axial direction of the inner wall of the shielding tube 2, and the plurality of contact points 20 are distributed at circumferential intervals along the inner wall of the shielding tube 2.

[0038] Reference Appendix Figure 3 A cavity is provided between the contact points 20 to reduce the clamping force during assembly. The cavity design is similar to the pressure relief groove in automotive seals, which reduces the pressing force required by the installer, which is crucial in industry operations with confined spaces.

[0039] The working principle is as follows: Equipotential bonding mechanism: The shielding tube 2 and the connecting tube 3 form an equipotential connection through contact point 20, which effectively extends the electrical creepage path. The traditional creepage path runs from the port of the shielding tube 2 along the mating interface to the stress cone port, which is prone to leakage. In this design, equipotential bonding allows the current to be directly shunted through contact point 20, extending the creepage path to 1.5-2 times that of the original design, significantly reducing the accident rate. Simultaneously, combined with multi-point contact, it enhances resistance to electrical breakdown.

[0040] The synergistic effect of contact point 20 and the cavity: The axial and circumferential arrangement of contact point 20 ensures stable electrical contact; the cavity provides elastic cushioning during assembly, reducing clamping force. In industrial installations, when the cable head 4 is interference-fitted with the cable, the cavity allows rubber deformation, avoiding stress concentration and improving sealing. During production, multi-point contact prevents the shielding tube 2 from deforming during vulcanization.

[0041] In the description of the embodiments of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as the second element, component, region, layer, or segment.

[0043] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A miniaturized cable head, characterized by include: Intermediate joint (1), which is hollow inside; The shielding tube (2) is located on the inner wall of the intermediate joint (1), and several contact points (20) are provided on the inner wall. The connecting tube (3) is fitted at both ends of the connection between the two cable cores (43), and its outer wall abuts against the contact point (20); The shielding tube (2) is designed to be at the same potential as the connecting tube (3) through several contact points (20) on the inner wall, so as to effectively extend the electrical creepage distance.

2. The miniaturized cable head as described in claim 1, characterized in that, At least two of the contact points (20) are axially arranged along the inner wall of the shielding tube (2).

3. The miniaturized cable head as described in claim 2, characterized in that, Each of the contact points (20) surrounds the inner wall of the shielding tube (2) 360° in the circumferential direction.

4. The miniaturized cable head as described in claim 2, characterized in that, Several of the contact points (20) are arranged at equal intervals along the circumferential direction of the inner wall of the shielding tube (2).

5. The miniaturized cable head as described in claim 1, characterized in that, The axial length of the shielding tube (2) is 3-4 times the protruding length of the cable core (43).

6. The miniaturized cable head as described in claim 2, characterized in that, A cavity is provided between several of the contact points (20).

7. The miniaturized cable head as described in claim 4, characterized in that, Several of the contact points (20) help prevent structural deformation of the shielding tube (2) during production.

Images