Oil-filled cable accessory stress cone sealing structure

Abstract

The utility model discloses a stress cone sealing structure of an oil-filled cable accessory. The stress cone sealing structure comprises an insulating sleeve, a cable, a stress cone, a positioning fitting and a fixing ring, a mounting cavity is formed in the insulating sleeve, and insulating filler is filled in the mounting cavity. The cable, the stress cone and the positioning fitting are all arranged in the mounting cavity, the stress cone and the positioning fitting are sleeved outside the cable, and the positioning fitting is arranged at the lower end of the stress cone. The outer wall of the stress cone is sleeved with a fixing ring, and the fixing ring is in sealed connection with the positioning fitting, so that the problem of sealing failure caused by uncertainty of environment, personnel and materials can be effectively prevented.

Description

Technical Field

[0001] This utility model relates to the field of cable accessory technology, specifically to an oil-filled cable accessory stress cone sealing structure. Background Technology

[0002] With the continuous development of power systems, the safety and reliability of cable terminals have become crucial issues in power transmission. Oil-filled cable terminals are widely used due to their excellent insulation performance, but their sealing performance has always been a technical challenge. The external insulation of oil-filled cable terminals typically uses porcelain bushings or composite bushings, with the interior filled with liquid insulating filler. The stress cone and its positioning hardware are immersed in insulating oil. Currently, the sealing between the stress cone and the positioning hardware mainly uses wrapping sealing tape. However, in low ambient temperatures, the tensile strength of the sealing tape weakens, making it difficult to achieve a full sealing effect after wrapping. Furthermore, prolonged high-temperature immersion of the sealing tape in liquid insulating filler can easily lead to tape aging and chemical reactions with the insulating filler, resulting in unstable sealing performance. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a structurally stable oil-filled cable accessory stress cone sealing structure.

[0004] This utility model proposes an oil-filled cable accessory stress cone sealing structure, comprising:

[0005] Insulating sleeve with mounting cavity;

[0006] A cable is inserted into the mounting cavity, and an insulating filler is filled between the outer wall of the cable and the inner wall of the mounting cavity.

[0007] A stress cone is fitted onto the outer wall of the cable and located between the outer wall of the cable and the insulating filler.

[0008] Positioning fittings are fitted onto the outer wall of the cable and installed below the stress cone;

[0009] A retaining ring is fitted onto the outer wall of the stress cone near the end of the positioning hardware, and the retaining ring is sealed to the positioning hardware.

[0010] In one embodiment, the bottom end of the stress cone extends downward and is fitted onto the outer wall of the positioning hardware near one end of the stress cone.

[0011] In one embodiment, the stress cone includes a semiconductive portion and an insulating portion fixedly connected; the upper end of the semiconductive portion is flared and open upwards; the insulating portion is sleeved outside the semiconductive portion.

[0012] In one embodiment, the positioning hardware has a support base that abuts against the bottom end of the stress cone.

[0013] In one embodiment, the lower surface of the fixing ring abuts against the upper end of the support base; the support base has a sealing groove on the side facing the fixing ring, and a sealing ring is provided in the sealing groove.

[0014] In one embodiment, the support base has a fixing hole for installing a fastener, and the fixing ring is fixedly installed to the support base by the fastener.

[0015] In one embodiment, the stress cone and the retaining ring are fixedly connected by an adhesive.

[0016] In one embodiment, the retaining ring is made of metal.

[0017] In one embodiment, the outer wall of the insulating sleeve has a plurality of outwardly protruding skirts distributed along the axial direction.

[0018] In one embodiment, the umbrella skirt and the insulating sleeve are integrally formed, and a plurality of the umbrella skirts are arranged in an alternating pattern of large and small sizes.

[0019] This utility model discloses an oil-filled cable accessory stress cone sealing structure, comprising an insulating sleeve, a cable, a stress cone, a positioning fitting, and a retaining ring. The insulating sleeve has an installation cavity filled with insulating filler. The cable, stress cone, and positioning fitting are all housed within the installation cavity, with the stress cone and positioning fitting fitted over the cable. The positioning fitting is located at the lower end of the stress cone. A retaining ring is fitted onto the outer wall of the stress cone, and the retaining ring is sealed to the positioning fitting, effectively preventing sealing failure due to uncertainties in environment, personnel, or materials. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional schematic diagram of an embodiment of the stress cone sealing structure for oil-filled cable accessories of this utility model;

[0022] Figure 2 yes Figure 1 A magnified view of section I in the middle.

[0023] Explanation of icon numbers:

[0024]

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0030] With the continuous development of power systems, the safety and reliability of cable terminals have become crucial issues in power transmission. Oil-filled cable terminals are widely used due to their excellent insulation performance, but their sealing performance has always been a technical challenge. The external insulation of oil-filled cable terminals typically uses porcelain bushings or composite bushings, with the interior filled with liquid insulating filler. The stress cone and its positioning hardware are immersed in insulating oil. Currently, the sealing between the stress cone and the positioning hardware mainly uses wrapping sealing tape. However, in low ambient temperatures, the tensile strength of the sealing tape weakens, making it difficult to achieve a full sealing effect after wrapping. Furthermore, prolonged high-temperature immersion of the sealing tape in liquid insulating filler can easily lead to tape aging and chemical reactions with the insulating filler, resulting in unstable sealing performance.

[0031] This utility model proposes a stress cone sealing structure for oil-filled cable accessories. Please refer to... Figures 1 to 2 The device includes: an insulating sleeve 1 having an installation cavity 1a; a cable 3 passing through the installation cavity 1a, with an insulating filler 2 filling the space between the outer wall of the cable 3 and the inner wall of the installation cavity 1a; a stress cone 4 fitted onto the outer wall of the cable 3 and located between the outer wall of the cable 3 and the insulating filler 2; a positioning hardware 5 fitted onto the outer wall of the cable 3 and installed below the stress cone 4; and a fixing ring 6 fitted onto the outer wall of the stress cone 4 near the positioning hardware 5, with the fixing ring 6 and the positioning hardware 5 being sealed together.

[0032] In this embodiment, the insulating sleeve 1 is a porcelain sleeve or a composite sleeve, with a hollow structure and an installation cavity 1a. The insulating filler 2 is an insulating liquid, preferably insulating oil. The cable 3 passes through the installation cavity 1a along the axial direction of the insulating sleeve 1. The cable 3 has a shielding layer 31 exposed after stripping. The stress cone 4 is made of silicone rubber and is fitted over the outside of the cable 3 to make the electric field distribution more uniform, avoid excessive local electric field strength, and improve the stability and reliability of the cable terminal. Preferably, the stress cone 4 is interference-fitted with the cable 3. This ensures that the stress cone 4 and the cable 3 fit tightly, avoids partial discharge in the air gap, and effectively improves the electrical performance and mechanical stability of the cable terminal. The positioning hardware 5 has a through hole for the cable 3 to pass through. The positioning hardware 5 is installed below the stress cone 4 and between the outer wall of the cable 3 and the insulating filler 2 to install and position the stress cone 4. A fixing ring 6 is fitted on the outer wall of the end of the stress cone 4 near the positioning hardware 5. Preferably, the retaining ring 6 is made of metal, which can effectively prevent material aging caused by long-term immersion in high temperature and improve the sealing connection stability of the overall structure. The retaining ring 6 is sealed to the positioning hardware 5, preventing the insulating filler 2 from seeping into the positioning hardware 5 and flowing out along the cable 3, effectively solving the leakage problem of the insulating filler 2 at the cable terminal.

[0033] This utility model provides an embodiment, please refer to it. Figure 1The bottom end of the stress cone 4 extends downward and is fitted onto the upper outer wall of the positioning hardware 5.

[0034] Specifically, the stress cone 4 extends downward at its bottom end to form a first connecting part, and the positioning hardware 5 has a second connecting part at its upper end. The first connecting part is fitted over the second connecting part, and the inner wall of the first connecting part is adapted to and fits the outer wall of the second connecting part to ensure the tight connection between the stress cone 4 and the positioning hardware 5.

[0035] Further, please refer to Figure 1 The stress cone 4 includes a semi-conductive part 41 and an insulating part 42 that are fixedly connected; the upper end of the semi-conductive part 41 is in the shape of an upward-opening trumpet; the insulating part 42 is sleeved on the outside of the semi-conductive part 41.

[0036] Specifically, the insulating part 42 is entirely sleeved on the outside of the semi-conductive part 41. The upper end of the semi-conductive part 42 is disposed inside the insulating part 42; the lower end of the semi-conductive part 42 is flush with the insulating part 42, or the lower end of the semi-conductive part 42 is located inside the insulating part 42. It can be understood that the lower end of the semi-conductive part 42 is in contact with the outer wall of the second connecting part of the positioning hardware 5.

[0037] Further, please refer to Figure 1 and Figure 2 The positioning hardware 5 has a support base 51, which abuts against the bottom end of the stress cone 4.

[0038] Specifically, a support seat 51 protrudes outward from the outer wall of the positioning hardware 5 near the stress cone 4. The support seat 51 is located below the first connecting part of the stress cone 4, and its upper end face abuts against the lower end face of the first connecting part. Understandably, the lower end face of the insulating part 42 abuts against the upper end face of the support seat 51. This effectively prevents the insulating filler 2 from entering the positioning hardware 5 through the tiny gap at the connection between the stress cone 4 and the positioning hardware 5, ensuring that the insulating filler 2 does not flow out of the insulating sleeve 1 along the gap between the cable 3 and the positioning hardware 5, effectively sealing the insulating filler 2 within the insulating sleeve 1.

[0039] Further, please refer to Figure 1 The lower surface of the fixing ring 6 abuts against the upper end of the support base 51; a sealing groove is provided on the side of the support base 51 facing the fixing ring 6, and a sealing ring 8 is provided in the sealing groove.

[0040] Specifically, the fixing ring 6 is installed on the upper end of the support base 51, with its lower end face abutting against the upper end face of the support base 51. The fixing ring 6 is sleeved on the outer wall of the stress cone 4, and its inner wall is tightly fitted against the outer wall of the insulation part 42. A sealing groove is provided on the end face of the support base 51 facing the fixing ring 6, and a sealing ring 8 is provided in the sealing groove to achieve a sealed connection between the fixing ring 6 and the positioning hardware 5. This effectively prevents the insulating filler 2 from entering the positioning hardware 5 from the tiny gap at the connection between the stress cone 4 and the positioning hardware 5, ensuring that the insulating filler 2 will not flow out of the insulating sleeve 1 along the gap between the cable 3 and the positioning hardware 5. The insulating filler 2 is effectively sealed inside the insulating sleeve 1, resulting in a good sealing effect, strong stability, and improved service life of the cable terminal.

[0041] Further, please refer to Figure 2 The support base 51 has a fixing hole for installing the fastener 7, and the fixing ring 6 is fixedly installed to the support base 51 by the fastener 7.

[0042] Understandably, fastener 7 can be a fastening bolt. Fastener 7 enables a detachable connection between the retaining ring 6 and the positioning hardware 5, simplifying the installation and disassembly of the cable accessory structure and improving the stability and reliability of the cable terminal.

[0043] Optionally, the stress cone 4 and the retaining ring 6 are fixedly connected using an adhesive. This ensures the tightness and stability of the connection between the stress cone 4 and the retaining ring 6.

[0044] Further, please refer to Figure 1 The outer wall of the insulating bushing 1 has several outwardly protruding skirts distributed along the axial direction. The skirts can increase the creepage distance of the insulating bushing 1, effectively prevent high-voltage discharge, and thus significantly improve the electrical performance and safety of the cable terminal.

[0045] Further, please refer to Figure 1 The umbrella skirt and the insulating sleeve 1 are integrally formed, and several umbrella skirts are arranged in an alternating pattern of large and small sizes, which effectively enhances the creepage effect and mechanical strength.

[0046] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the 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.

[0047] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A stress cone sealing structure for oil-filled cable accessories, characterized in that, include: Insulating sleeve (1), having mounting cavity (1a); The cable (3) is inserted into the mounting cavity (1a), and the space between the outer wall of the cable (3) and the inner wall of the mounting cavity (1a) is filled with insulating filler (2). Stress cone (4) is sleeved on the outer wall of the cable (3) and located between the outer wall of the cable (3) and the insulating filler (2); Positioning fittings (5) are sleeved on the outer wall of the cable (3) and installed below the stress cone (4); A fixing ring (6) is fitted onto the outer wall of the stress cone (4) near the positioning hardware (5), and the fixing ring (6) is sealed to the positioning hardware (5).

2. The oil-filled cable accessory stress cone sealing structure as described in claim 1, characterized in that, The bottom end of the stress cone (4) extends downward and is fitted onto the outer wall of the positioning hardware (5) near one end of the stress cone (4).

3. The oil-filled cable accessory stress cone sealing structure as described in claim 2, characterized in that, The stress cone (4) includes a semi-conductive part (41) and an insulating part (42) that are fixedly connected; the upper end of the semi-conductive part (41) is in the shape of an upward-opening trumpet; the insulating part (42) is sleeved on the outside of the semi-conductive part (41).

4. The oil-filled cable accessory stress cone sealing structure as described in claim 1, characterized in that, The positioning hardware (5) has a support base (51) that abuts against the bottom end of the stress cone (4).

5. The oil-filled cable accessory stress cone sealing structure as described in claim 4, characterized in that, The lower surface of the fixing ring (6) abuts against the upper end of the support base (51); a sealing groove is provided on the side of the support base (51) facing the fixing ring (6), and a sealing ring (8) is provided in the sealing groove.

6. The oil-filled cable accessory stress cone sealing structure as described in claim 4, characterized in that, The support base (51) has a fixing hole for installing the fastener (7), and the fixing ring (6) is fixedly installed to the support base (51) through the fastener (7).

7. The oil-filled cable accessory stress cone sealing structure as described in claim 1, characterized in that, The stress cone (4) and the fixing ring (6) are fixedly connected by an adhesive.

8. The oil-filled cable accessory stress cone sealing structure as described in claim 1, characterized in that, The fixing ring (6) is made of metal.

9. The oil-filled cable accessory stress cone sealing structure as described in claim 1, characterized in that, The outer wall of the insulating sleeve (1) has several outwardly protruding skirts distributed along the axial direction.

10. The oil-filled cable accessory stress cone sealing structure as described in claim 9, characterized in that, The umbrella skirt and the insulating sleeve (1) are integrally formed, and several of the umbrella skirts are arranged in an alternating pattern of large and small.

Images