Insulating ring and intermediate joint
By employing a mechanical interlocking structure combining a metal nest and an epoxy resin-based insulator in the intermediate joint, the problem of brittle fracture under short-circuit explosions in traditional intermediate joints is solved, achieving improved insulation performance and impact resistance, and simplifying the installation process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 深圳市沃尔电力技术有限公司
- Filing Date
- 2025-04-02
- Publication Date
- 2026-05-12
AI Technical Summary
The epoxy resin insulation of traditional intermediate joints is prone to brittle fracture under short-circuit explosion, leading to insulation failure. Furthermore, existing improvement solutions suffer from complex processes, high costs, or reduced insulation performance.
A mechanically interlocking structure is formed by combining a first metal nest and a second metal nest with an epoxy resin-based insulator to enhance impact resistance, and the connection is improved by fixing it with a threaded blind hole.
It improves the safety and mechanical strength of the insulating ring, reduces installation costs, simplifies the operation process, and enhances insulation performance and safety.
Smart Images
Figure CN224233324U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power equipment safety protection technology, and in particular to an insulating ring and an intermediate joint. Background Technology
[0002] In power systems, cable joints are critical nodes prone to failure. Traditional joints often use pure epoxy resin insulation for their outer protective shell, connected to a metal flange via threaded inserts. However, epoxy resin is a brittle material, and under the high impact loads generated by short-circuit explosions, the threaded connection is prone to brittle fracture due to stress concentration, leading to insulation failure and endangering surrounding personnel and equipment. While enhancing the toughness of the epoxy resin or adding a metal bushing can partially alleviate the problem, these methods have drawbacks such as complex manufacturing processes, high costs, or reduced insulation performance. Therefore, there is an urgent need for a new structure that can maintain high insulation performance while significantly improving explosion resistance. Utility Model Content
[0003] This utility model discloses an insulating ring and an intermediate joint, aiming to provide an insulating ring that enhances the structural resistance to load impact and provides good insulation.
[0004] To achieve the above objectives, the present invention proposes an insulating ring comprising an insulator body, wherein the insulator body is an annular structure, and the insulator body includes a first surface and a second surface perpendicular to the axial direction, wherein a first groove is formed on the first surface and a second groove is formed on the second surface.
[0005] A first metal nest, the first metal nest having a first annular mounting portion, the first annular mounting portion having a first abutting surface facing the first surface and a first mounting surface facing away from the first surface, the first abutting surface having an axially protruding first annular fitting portion, the first annular fitting portion being tightly connected to the first groove.
[0006] The second metal nest has a second annular mounting portion, which has a second abutting surface facing the second surface and a second mounting surface facing away from the second surface. The second abutting surface has an axially protruding second annular fitting portion, which is tightly connected to the second groove.
[0007] Preferably, the first surface and the second surface are annular surfaces, and the annular surfaces of the first surface and the second surface have the same annular width; the first abutting surface and the first mounting surface are annular surfaces, and the annular surfaces of the first abutting surface and the first mounting surface have the same annular width; the second abutting surface and the second mounting surface are annular surfaces, and the annular surfaces of the second abutting surface and the second mounting surface have the same annular width; the annular surfaces of the first surface, the first abutting surface, and the second abutting surface have the same annular width.
[0008] Preferably, the depth of the first groove is less than the height of the insulator body; the depth of the second groove is less than the height of the insulator body; and the first groove and the second groove are arranged radially apart.
[0009] Preferably, the insulator body is an epoxy resin-based insulator.
[0010] Preferably, the first mounting surface of the first annular mounting portion is provided with a plurality of first fixing holes, and the second mounting surface of the second annular mounting portion is provided with a plurality of second fixing holes.
[0011] Preferably, the first fixing hole and the second fixing hole are threaded blind holes.
[0012] Preferably, the diameter of the first fixing hole and / or the second fixing hole is 10mm-24mm.
[0013] Preferably, the ratio of the thread depth to the thread diameter of the first fixing hole and / or the second fixing hole is 1.8:1 to 2.5:1.
[0014] This utility model also proposes an intermediate joint, which includes an insulating ring as described in any of the above claims, wherein the first metal nest and the second metal nest are fixedly connected to the flange structure of the intermediate joint protective housing.
[0015] The beneficial effects of this utility model are:
[0016] This utility model is composed of a first metal nest, a second metal nest, and an insulator body nested together. The first metal nest is interlocked above the insulator body, which can prevent the high impact load generated by the short circuit explosion above the insulator body, has good structural strength, and avoids stress concentration causing cracks and brittle fracture. The second metal nest is interlocked below the insulator body, which can prevent the high impact load generated by the short circuit explosion below the insulator body, has good structural strength, and avoids stress concentration causing cracks and brittle fracture, thus improving the safety of the insulating ring. The first metal nest, the insulator body, and the second metal nest form a mechanical interlock, ensuring the mechanical structural strength of the connection, reducing installation costs, improving production efficiency, simplifying operation, and making it safer and more reliable. Attached Figure Description
[0017] 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.
[0018] Figure 1 This is a schematic diagram of the structure of an insulating ring according to an embodiment of the present invention;
[0019] Figure 2 This is a schematic diagram of the structure of the insulator body according to an embodiment of the present invention;
[0020] Figure 3 This is a schematic diagram of the structure of the first metal nesting body according to an embodiment of the present invention;
[0021] Figure 4 This is a schematic diagram of the structure of the second metal nesting body according to an embodiment of the present invention;
[0022] Figure 5 This is a cross-sectional view of the insulator body according to an embodiment of the present invention;
[0023] Figure 6 This is a cross-sectional view of the structure of the first metal nesting body according to an embodiment of the present invention;
[0024] Figure 7 This is a cross-sectional view of the structure of the second metal nesting body according to an embodiment of the present invention.
[0025] Figure 8 This is a partial cross-sectional view of the insulator body according to an embodiment of the present invention;
[0026] Figure 9 This is a partial cross-sectional view of the first metal nesting body according to an embodiment of the present invention;
[0027] Figure 10 This is a partial cross-sectional view of the second metal nesting body according to an embodiment of the present invention.
[0028] In the above figures: 1. Insulator body; 10. Through hole; 11. First surface; 111. First groove; 12. Second surface; 121. Second groove; 13. Third surface; 14. Fourth surface; 2. First metal nest; 21. First annular mounting part; 211. First through hole; 212. First abutting surface; 213. First mounting surface; 214. First inner annular surface; 215. First outer annular surface; 22. First annular fitting part; 23. First fixing hole; 3. Second metal nest; 31. Second annular mounting part; 311. Second through hole; 312. Second abutting surface; 313. Second mounting surface; 314. Second inner annular surface; 315. Second outer annular surface; 32. Second annular fitting part; 33. Second fixing hole.
[0029] 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
[0030] 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.
[0031] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure), and are not intended to indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific way. Therefore, they should not be construed as limitations on this utility model. If the specific posture changes, the directional indication will also change accordingly.
[0032] like Figure 1As shown, this utility model provides an insulating ring, including an insulator body 1, which has a ring-shaped structure. The insulator body 1 includes a first surface 11 and a second surface 12 perpendicular to the axial direction. A first groove 111 is formed on the first surface 11, and a second groove 121 is formed on the second surface 12. A first metal nest 2 has a first annular mounting portion 21, which has a first abutting surface 212 facing the first surface 11 and a first mounting surface 213 facing away from the first surface 11. The first abutting surface 212 has an axially protruding first annular fitting portion 22, which is correspondingly and tightly connected to the first groove 111. A second metal nest 3 has a second annular mounting portion 31, which has a second abutting surface 312 facing the second surface 12 and a second mounting surface 313 facing away from the second surface 12. The second abutting surface 312 has an axially protruding second annular fitting portion 32, which is correspondingly and tightly connected to the second groove 121.
[0033] In this embodiment, as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the insulating ring is formed by nesting a first metal nest 2, a second metal nest 3, and an insulator body 1. The first metal nest 2 is interlocked above the insulator body 1. The first metal nest 2 can prevent the high impact load generated by the short circuit explosion above the insulator body 1, has good structural strength, and avoids stress concentration causing cracks that lead to brittle fracture. The second metal nest 3 is interlocked below the insulator body 1. The second metal nest 3 can prevent the high impact load generated by the short circuit explosion below the insulator body 1, has good structural strength, and avoids stress concentration causing cracks that lead to brittle fracture, thus improving the safety of the insulating ring. The first metal nest 2, the insulator body 1, and the second metal nest 3 form a mechanical interlock, ensuring the mechanical structural strength of the connection, reducing installation costs, improving production efficiency, simplifying operation, and making it safer and more reliable.
[0034] Preferably, the first metal nest 2 and / or the second metal nest 3 are made of metal, preferably austenitic stainless steel, titanium alloy or forged aluminum alloy.
[0035] In actual implementation, the insulator body 1 has a ring-shaped structure with a through hole 10 in the middle. The first surface 11 and the second surface 12 are perpendicular to the axial direction of the through hole 10. The insulator body 1 also includes a third surface 13 near the through hole 10 and a fourth surface 14 away from the through hole 10. It can be understood that the first metal nest 2 has a ring-shaped structure with a first through hole 211 in the middle. The first mounting surface 213 and the first abutting surface 212 are perpendicular to the axial direction of the first through hole 211. The first metal nest 2 includes a first inner ring surface 214 near the first through hole 211 and a first outer ring surface 215 away from the first through hole 211. The first surface 11 of the insulator body 1 and the first ring-shaped structure... The first abutting surface 212 of the mounting portion 21 abuts tightly to make the first annular fitting portion 22 tightly embedded in the first groove 111; it can be understood that the second metal nest 3 is an annular structure with a second through hole 311 in the middle, the second mounting surface 313 and the second abutting surface 312 are perpendicular to the axial direction of the second through hole 311, the second metal nest 3 includes a second inner annular surface 314 close to the second through hole 311 and a second outer annular surface 315 away from the second through hole 311, the second surface 12 of the insulator body 1 abuts tightly with the second abutting surface 312 of the second annular mounting portion 31 to make the second annular fitting portion 32 tightly embedded in the second groove 121.
[0036] In one embodiment, the first surface 11 and the second surface 12 are annular surfaces, and the annular surfaces of the first surface 11 and the second surface 12 have the same annular width; the first abutting surface 212 and the first mounting surface 213 are annular surfaces, and the annular surfaces of the first abutting surface 212 and the first mounting surface 213 have the same annular width; the second abutting surface 312 and the second mounting surface 313 are annular surfaces, and the annular surfaces of the second abutting surface 312 and the second mounting surface 313 have the same annular width; the annular surfaces of the first surface 11, the first abutting surface 212 and the second abutting surface 312 have the same annular width.
[0037] In this embodiment, as Figure 1 , Figure 5 , Figure 6 and Figure 7 As shown, the annular widths of the first surface 11, the first abutting surface 212, and the second abutting surface 312 are the same, ensuring that the annular widths of the first surface 11, the second surface 12, the first abutting surface 212, the first mounting surface 213, the second abutting surface 312, and the second mounting surface 313 are all the same, making the insulating ring a hollow cylinder with a consistent upper and lower diameter, thus improving the overall safety of the insulating ring.
[0038] In actual implementation, the annular width of the first surface 11 and the second surface 12 is determined according to the actual installation requirements, and no specific restrictions are imposed here.
[0039] In one embodiment, the depth of the first groove 111 is less than the height of the insulator body 1; the depth of the second groove 121 is less than the height of the insulator body 1; the first groove 111 and the second groove 121 are arranged radially spaced apart.
[0040] In this embodiment, as Figure 1 , Figure 5 and Figure 8 As shown, the depth of the first groove 111 is less than the height of the insulator body 1. It can be understood that the first groove 111 is located on the first surface 11 and between the first inner ring surface 214 and the first outer ring surface 215. By placing the first groove 111 between the first inner ring surface 214 and the first outer ring surface 215, the groove wall of the first groove 111 does not contact the first inner ring surface 214 and the first outer ring surface 215, ensuring the integrity of the first groove 111 and enabling the insulating ring to form a uniform first groove 111. The depth of the second groove 121 is less than the height of the insulator body 1. It can be understood that the second groove 121 is located on the second surface 12 and between the first inner ring surface 214 and the first outer ring surface 215. Two grooves 121 are disposed between the first inner ring surface 214 and the first outer ring surface 215 so that the groove wall of the second groove 121 does not contact the first inner ring surface 214 and the first outer ring surface 215, ensuring the integrity of the second groove 121 and enabling the insulating ring to form a uniform second groove 121, thereby improving the insulation performance of the insulating ring. The first groove 111 and the second groove 121 are arranged radially spaced so that the groove wall of the first groove 111 is spaced apart from the first inner ring surface 214, the first outer ring surface 215 and the groove wall of the second groove 121. Similarly, the groove wall of the second groove 121 is spaced apart from the first inner ring surface 214, the first outer ring surface 215 and the groove wall of the first groove 111, thereby improving the safety of the insulating ring.
[0041] In actual implementation, the depths of the first groove 111 and the second groove 121 are determined according to the actual installation requirements, and no specific restrictions are imposed here.
[0042] In one embodiment, the insulator body 1 is an epoxy resin-based insulator.
[0043] In this embodiment, as Figure 1 and Figure 2 As shown, the main body 1 of the insulator is an epoxy resin-based insulator, which has high tensile strength, flexural strength and hardness, as well as high volume resistivity and surface resistivity, ensuring the high insulation performance of the insulating ring.
[0044] In actual implementation, the insulator body 1 is preferably bisphenol A type epoxy resin.
[0045] In one embodiment, a plurality of first fixing holes 23 are provided on the first mounting surface 213 of the first annular mounting portion 21, and a plurality of second fixing holes 33 are provided on the second mounting surface 313 of the second annular mounting portion 31.
[0046] In this embodiment, as Figure 1 , Figure 6 and Figure 7 As shown, a plurality of first fixing holes 23 are provided on the first mounting surface 213, and a plurality of second fixing holes 33 are provided on the second mounting surface 313, so that the first metal nest 2 and the second metal nest 3 can be fixedly connected to the external components respectively, thereby improving the safety of the insulating ring.
[0047] In actual implementation, a plurality of first fixing holes 23 are provided on the first mounting surface 213. The number of first fixing holes 23 is preferably 16.
[0048] In actual implementation, a number of second fixing holes 33 are provided on the second mounting surface 315. The number of second fixing holes 33 is preferably 16.
[0049] In one embodiment, the first fixing hole 23 and the second fixing hole 33 are threaded blind holes.
[0050] In this embodiment, as Figure 1 , Figure 6 and Figure 7 As shown, the first fixing hole 23 and the second fixing hole 33 are blind holes with threads. When the first fixing hole 23 and the second fixing hole 33 are blind holes with threads, the first metal nest 2 and the second metal nest 3 can be fixed respectively by threaded fasteners (not shown), which facilitates maintenance and replacement.
[0051] In one embodiment, the diameter of the first fixing hole 23 and / or the second fixing hole 33 is 10mm-24mm.
[0052] In this embodiment, as Figure 1 , Figure 6 and Figure 7 As shown, the first fixing hole 23 is provided on the first mounting surface 213, and the second fixing hole 33 is provided on the second mounting surface 313. The diameter of the first fixing hole 23 and the second fixing hole 33 has an important influence on the tightness of the connection between the first annular mounting part and the threaded fastener (not shown). A suitable diameter can effectively improve the safety of the insulating ring.
[0053] In actual implementation, the diameter of the first fixing hole 23 and / or the second fixing hole 33 is preferably 10mm-24mm.
[0054] In actual implementation, the diameter of the first fixing hole 23 and / or the second fixing hole 33 is preferably 15 mm.
[0055] In one embodiment, the ratio of the thread depth to the thread diameter of the first fixing hole 23 and / or the second fixing hole 33 is 1.8:1 to 2.5:1.
[0056] In this embodiment, as Figure 1 , Figure 6 and Figure 7 As shown, the ratio of thread depth to thread diameter of the first fixing hole 23 and / or the second fixing hole 33 is 1.8:1 to 2.5:1. This range ensures the stability and reliability of the threaded connection while avoiding connection instability caused by threads that are too deep or too shallow.
[0057] In actual implementation, the ratio of the thread depth to the thread diameter of the first fixing hole 23 is 1.8:1 to 2.5:1.
[0058] In actual implementation, the ratio of the thread depth to the thread diameter of the second fixing hole 33 is 1.8:1 to 2.5:1.
[0059] An intermediate joint includes an insulating ring as described above, a first metal nest 2 and a second metal nest 3 fixedly connected to a flange structure of an intermediate joint protective housing.
[0060] In practice, intermediate joints are used in composite explosion-proof cables.
[0061] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.
Claims
1. An insulating ring, characterized in that, include: The insulator body (1) is a ring structure. The insulator body (1) includes a first surface (11) and a second surface (12) perpendicular to the axial direction. A first groove (111) is provided on the first surface (11), and a second groove (121) is provided on the second surface (12). The first metal nest (2) has a first annular mounting portion (21), the first annular mounting portion (21) has a first abutting surface (212) facing the first surface (11) and a first mounting surface (213) facing away from the first surface (11), the first abutting surface (212) has an axially protruding first annular fitting portion (22), the first annular fitting portion (22) is correspondingly and tightly connected to the first groove (111); The second metal nest (3) has a second annular mounting portion (31), the second annular mounting portion (31) has a second abutting surface (312) facing the second surface (12) and a second mounting surface (313) facing away from the second surface (12), the second abutting surface (312) has an axially protruding second annular fitting portion (32), the second annular fitting portion (32) is correspondingly and tightly connected to the second groove (121).
2. The insulating ring as described in claim 1, characterized in that, The first surface (11) and the second surface (12) are annular surfaces, and the annular widths of the first surface (11) and the second surface (12) are the same; The first abutting surface (212) and the first mounting surface (213) are annular surfaces, and the annular widths of the first abutting surface (212) and the first mounting surface (213) are the same. The second abutting surface (312) and the second mounting surface (313) are annular surfaces, and the annular widths of the second abutting surface (312) and the second mounting surface (313) are the same. The annular surfaces of the first surface (11), the first contact surface (212), and the second contact surface (312) have the same width.
3. The insulating ring as described in claim 1, characterized in that, The depth of the first groove (111) is less than the height of the insulator body (1); The depth of the second groove (121) is less than the height of the insulator body (1); The first groove (111) and the second groove (121) are arranged radially apart.
4. The insulating ring as described in claim 1, characterized in that, The insulator body (1) is an epoxy resin-based insulator.
5. The insulating ring as described in claim 1, characterized in that, The first mounting surface (213) of the first annular mounting part (21) is provided with a plurality of first fixing holes (23), and the second mounting surface (313) of the second annular mounting part (31) is provided with a plurality of second fixing holes (33).
6. The insulating ring as described in claim 5, characterized in that, The first fixing hole (23) and the second fixing hole (33) are threaded blind holes.
7. The insulating ring as described in claim 6, characterized in that, The diameter of the first fixing hole (23) and / or the second fixing hole (33) is 10mm-24mm.
8. The insulating ring as described in claim 7, characterized in that, The ratio of the thread depth to the thread diameter of the first fixing hole (23) and / or the second fixing hole (33) is 1.8:1 to 2.5:
1.
9. An intermediate joint, characterized in that, The intermediate joint includes an insulating ring as described in any one of claims 1-8, wherein the first metal nest (2) and the second metal nest (3) are fixedly connected to the flange structure of the intermediate joint protective housing.