A high-voltage resistant and corrosion-proof composite insulator

Abstract

The application relates to the technical field of insulators, and discloses a high-voltage endurance and corrosion-resistant composite insulator, which comprises a core rod 2, detachable top-end fittings 1 and bottom fittings 3 are connected to the upper and lower ends of the core rod 2, a plurality of umbrella skirt groups are sleeved outside the core rod 2, each umbrella skirt group comprises an upper umbrella skirt 4, a first opening 41 is arranged at the upper edge of the upper umbrella skirt 4, the umbrella skirt group further comprises a lower umbrella skirt 5 arranged below the upper umbrella skirt 4, the outer diameter of the lower umbrella skirt 5 is larger than that of the upper umbrella skirt 4, a second opening 51 is arranged on the lower umbrella skirt 5, and the positions of the first openings 41 and the second openings 51 are staggered. The high-voltage endurance and corrosion-resistant composite insulator has the advantages of anti-tearing, double protection and strong waterproof performance, and solves the problems that the umbrella skirt is prone to cracking and tearing in the prior art.

Description

Technical Field

[0001] This invention relates to the field of insulator technology, specifically to a high-voltage, corrosion-resistant composite insulator. Background Technology

[0002] In 110kV and above high-voltage power transmission and transformation systems, composite insulators must simultaneously meet the requirements of electrical stability under strong electric fields, mechanical endurance under heavy loads, and corrosion resistance in complex environments. However, traditional products have significant shortcomings. Strong electric fields concentrate the electric field at the edges of the skirts and other parts, easily triggering corona discharge and causing galvanic corrosion of the silicone rubber, resulting in decreased hydrophobicity and insulation failure. In 500kV and above lines, this problem accounts for 40% of all insulator failures after 10 years of operation. High-voltage lines bear heavy mechanical loads. Under alternating stress and corrosion from acid rain and salt spray, the mechanical strength of traditional core rods decreases by 5% to 8% annually, with a decrease of over 30% in coastal areas over 5 years, posing a risk of breakage. Anti-corrosion measures are also limited in effectiveness. Thickening the sheath increases the load, and the coating is prone to peeling and forming dirt spots. Corrosion is rapid at the connection between the fittings and the core rod, easily leading to interface insulation failure. At the same time, high-voltage lines pass through areas with large temperature differences and strong corrosion, making silicone rubber brittle or hardened, and sealing prone to failure, creating a vicious cycle of performance degradation. Traditional products can no longer meet the requirements of high-voltage lines for "large capacity, long life, and high reliability," and there is an urgent need for new insulators that combine strong durability and full corrosion resistance. Traditional composite insulators mostly use an integral ring structure for their skirts, which can provide continuous insulation and waterproof barrier, but the following key problems have gradually been exposed in actual operation.

[0003] The risk of tearing due to thermal expansion and contraction is significant. Composite insulator skirts are made of silicone rubber, whose coefficient of thermal expansion is much higher than that of the glass fiber composite material of the internal core rod. In environments with large diurnal temperature differences, strong sunlight, or extreme low temperatures, the outer and inner rings of the skirt experience significant stress due to the difference in their expansion and contraction. The outer ring expands and contracts greatly due to temperature changes, while the inner ring, constrained by its connection to the core rod, endures tensile or compressive stress at the base and edges of the skirt for extended periods. After prolonged cycles, the skirt is prone to cracking and tearing, especially in areas with large temperature differences. Such faults directly threaten the safe operation of the power line. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a high-voltage, corrosion-resistant composite insulator with advantages such as tear resistance, dual protection, and strong waterproof performance, thus solving the problem of easy cracking and tearing of the skirts in existing technologies.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] A high-voltage, corrosion-resistant composite insulator includes a core rod with detachable top and bottom fittings at its upper and lower ends, respectively. Multiple skirt assemblies are sleeved on the outer side of the core rod. Each skirt assembly includes an upper skirt with a first opening at its upper edge. The skirt assembly also includes a lower skirt positioned below the upper skirt, with the outer diameter of the lower skirt being larger than that of the upper skirt. A second opening is provided on the lower skirt, and the first and second openings are staggered.

[0009] Preferably, the upper umbrella skirt has two symmetrically arranged first openings, and the lower umbrella skirt has two symmetrically arranged second openings, with any second opening and any first opening located at a 90-degree angle on the circumference of the mandrel.

[0010] Preferably, the upper umbrella skirt has a first opening, and the lower umbrella skirt has a second opening. The first opening and the second opening are located symmetrically on the circumference. The lower surface of the upper umbrella skirt is provided with multiple support plates and multiple support columns. Each support column and support plate is arranged on the same spiral line. The minimum radius of the inner circle of the spiral line is greater than the inner radius of the upper and lower umbrella skirts, and the maximum radius of the outer circle of the spiral line is smaller than the outer radius of the upper umbrella skirt. The spiral line has more than four spirals. Each support plate is located on the side closer to the second opening, and each support column is located on the side closer to the first opening.

[0011] The number of support plates is four, including two inner ring support plates and two outer ring support plates. The inner ring support plates are located on the second ring of the vortex line counting from the inside out, and the outer ring support plates are located on the second ring of the vortex line counting from the outside in. The airflow blown into the interlayer between the upper and lower umbrella skirts from the first opening is guided to both sides by the core rod. The inner ring support plates guide the airflow blown to both sides to the side closer to the second opening, and the corresponding outer ring support plates guide the airflow blown to the side of the second opening to be discharged at the second opening.

[0012] Preferably, the number of support columns is four, including two inner ring support columns and two outer ring support columns. The inner ring support columns are located on the second ring of the spiral line counting from the inside out, and the outer ring support columns are located on the second ring of the spiral line counting from the outside in.

[0013] Within any given support column, the support column is composed of multiple columns, with gaps between adjacent columns.

[0014] Preferably, the lower umbrella skirt is also provided with waist holes at the positions corresponding to the support plates, and each waist hole is located on the outer side of the corresponding support plate. The outer side of the support plate refers to the side of the support plate away from the axis of the mandrel.

[0015] Preferably, the support plate is a straight plate structure, and the inner side of each support plate is tangent to the arc corresponding to the vortex line; or, the support plate is an arc plate structure, and the inner side of each support plate coincides with the arc corresponding to the vortex line.

[0016] Preferably, the center of the column on each support column is located on the spiral line.

[0017] Preferably, the support plate has a chamfered bevel at the end near the lower skirt, and the chamfered bevel is located on the outer side near the support plate.

[0018] Preferably, the top fitting and the bottom fitting are fixed to the core rod by threads. The bottom fitting is a threaded rod used to fix the insulator to the base, and the top fitting is a clamp used to support and fix the cable.

[0019] Preferably, the opening widths of the first opening and the second opening gradually increase from the side closer to the mandrel to the side farther away from the mandrel.

[0020] (III) Beneficial Effects

[0021] Compared with the prior art, the present invention provides a high-voltage, corrosion-resistant composite insulator with the following advantages:

[0022] 1. This high-voltage, corrosion-resistant composite insulator enhances its durability by utilizing a first and a second opening to eliminate the expansion stress caused by thermal expansion and contraction of the upper and lower sheds. Simultaneously, the presence of two upper and lower sheds, with the first and second openings staggered, ensures that water droplets passing through the first opening fall onto the lower shed, thus resolving the issue of reduced waterproofing performance caused by the openings. Finally, the presence of two upper and lower sheds, with the outer radius of the lower shed being larger than that of the upper shed, creates a double-layer protection.

[0023] 2. This high-voltage, corrosion-resistant composite insulator has a support plate positioned near the second opening. Airflow blown into the interlayer between the upper and lower sheds from the first opening is guided to both sides by the core rod. The inner ring support plate guides the airflow blown to both sides to the side near the second opening, while the corresponding outer ring support plate guides the airflow blown to the side near the second opening to be discharged at the second opening. The vortex-like layout improves airflow within the interlayer, enhancing dust removal. Furthermore, the circumferential layout of the vortex-like lines also increases the support force of the lower shed on the upper shed. The support column is positioned near the first opening and is composed of multiple columns with gaps. While providing support force through the distribution of the vortex-like lines, the support column does not obstruct airflow or rainwater.

[0024] 3. This high-voltage, corrosion-resistant composite insulator features waist holes on the lower umbrella skirt. When airflow blows upwards to the area below the lower umbrella skirt, the airflow passes through the waist holes and flows upwards to the upper umbrella skirt, thus sharing the pressure of the lower umbrella skirt. This prevents the umbrella skirt from breaking due to tension when the airflow blows upwards. At the same time, the waist holes are located on the lower umbrella skirt at the position corresponding to the outer side of the support plate. The support plate covers the waist holes, reducing the possibility of water flowing through them or dust clogging them. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0026] Figure 2 This is an exploded view of Embodiment 1 of the present invention.

[0027] Figure 3 This is a front view of Embodiment 1 of the present invention.

[0028] Figure 4 This is a cross-sectional perspective view of Embodiment 1 of the present invention.

[0029] Figure 5 This is an exploded view of the upper umbrella skirt 4 and the lower umbrella skirt 5 in Embodiment 1 of the present invention.

[0030] Figure 6 This is a bottom view of the upper umbrella skirt 4 in Embodiment 1 of the present invention.

[0031] Figure 7 This is a top view of the upper umbrella skirt 4 and the lower umbrella skirt 5 in Embodiment 1 of the present invention. The part of the lower umbrella skirt 5 that is covered is shown with a dashed line, and a spiral line 6 that does not exist on the product is also shown with a dashed line.

[0032] Figure 8 The following is a lower view of the umbrella skirt 5 according to an embodiment of the present invention.

[0033] Figure 9 This is a schematic diagram of the upper umbrella skirt 4 and the lower umbrella skirt 5 in Embodiment 1 of the present invention.

[0034] Figure 10 This is Embodiment 1 of the present invention. Figure 9 A magnified view of a portion of point A in the middle.

[0035] Figure 11 This is a top view of the upper umbrella skirt 4 and the lower umbrella skirt 5 in Embodiment 2 of the present invention. The part of the lower umbrella skirt 5 that is covered is shown in dashed lines.

[0036] In the diagram: 1. Top fitting; 2. Core rod; 3. Bottom fitting; 4. Upper umbrella skirt; 5. Lower umbrella skirt; 41. First opening; 42. Support column; 43. Support plate; 431. Chamfered bevel; 51. Second opening; 52. Waist hole; 6. Spiral line. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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. Therefore, they should not be construed as limitations on this invention.

[0039] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0041] Example 1:

[0042] This embodiment provides a high-voltage, corrosion-resistant composite insulator with the following technical features.

[0043] Please see Figure 1-10 A high-voltage, corrosion-resistant composite insulator includes a core rod 2. The top and bottom ends of the core rod 2 are detachably connected to a top fitting 1 and a bottom fitting 3, respectively. Multiple umbrella skirt groups are sleeved on the outside of the core rod 2. Each umbrella skirt group includes an upper umbrella skirt 4. The upper edge of the upper umbrella skirt 4 is provided with a first opening 41. The umbrella skirt group also includes a lower umbrella skirt 5 located below the upper umbrella skirt 4. The outer diameter of the lower umbrella skirt 5 is larger than the outer diameter of the upper umbrella skirt 4. The lower umbrella skirt 5 is provided with a second opening 51. The positions of the first opening 41 and the second opening 51 are staggered.

[0044] Through the above improvements, the expansion stress caused by thermal expansion and contraction of the upper and lower umbrella skirts 4 and 5 is eliminated by the first opening 41 and the second opening 51, thereby enhancing the insulator's endurance performance. At the same time, because two upper umbrella skirts 4 and 5 are provided, and the first opening 41 and the second opening 51 are staggered, water droplets passing through the first opening 41 will fall onto the lower umbrella skirt 5, solving the problem of reduced waterproof performance caused by the openings. Finally, because two upper umbrella skirts 4 and 5 are provided, and the outer radius of the lower umbrella skirt 5 is larger than the outer radius of the upper umbrella skirt 4, double-layer protection is formed by the two umbrella skirts.

[0045] It should be noted that each skirt in the skirt assembly is individually fitted onto the core rod 2; or, each skirt in the skirt assembly is a single piece, fitted onto the core rod 2 by cold shrinking or heat shrinking.

[0046] In an optional embodiment, the upper umbrella skirt 4 is provided with a first opening 41, and the lower umbrella skirt 5 is provided with a second opening 51. The first opening 41 and the second opening 51 are located symmetrically on the circumference. The lower surface of the upper umbrella skirt 4 is provided with a plurality of support plates 43 and a plurality of support columns 42. Each support column 42 and support plate 43 is arranged on the same spiral line 6. The minimum radius of the inner circle of the spiral line 6 is greater than the inner hole radius of the upper umbrella skirt 4 and the lower umbrella skirt 5. The maximum radius of the outer circle of the spiral line 6 is smaller than the outer circle radius of the upper umbrella skirt 4. The spiral line 6 has more than four circles. Each support plate 43 is arranged on the side closer to the second opening 51, and each support column 42 is arranged on the side closer to the first opening 41.

[0047] The number of support plates 43 is four, including two inner ring support plates 43 and two outer ring support plates 43. The inner ring support plates 43 are located on the second ring from the inside out of the vortex line 6, and the outer ring support plates 43 are located on the second ring from the outside in of the vortex line 6. The airflow blown into the interlayer between the upper umbrella skirt 4 and the lower umbrella skirt 5 from the first opening 41 is guided to both sides by the core rod 2. The inner ring support plates 43 guide the airflow blown to both sides to the side closer to the second opening 51, and the corresponding outer ring support plates 43 guide the airflow blown to the side of the second opening 51 to be discharged at the second opening 51.

[0048] With the above improvements, the support plate 43 is positioned on the side close to the second opening 51. The airflow blown into the interlayer between the upper umbrella skirt 4 and the lower umbrella skirt 5 from the first opening 41 is guided to both sides by the core rod 2. The inner ring support plate 43 guides the airflow blown to both sides to the side close to the second opening 51. The corresponding outer ring support plate 43 guides the airflow blown to the side of the second opening 51 to the second opening 51 for discharge. The layout of the vortex line 6 improves the airflow in the interlayer, improves the cleaning of dust, and the circumferential layout of the vortex line 6 can also improve the support force of the lower umbrella skirt 5 on the upper umbrella skirt 4.

[0049] In an optional embodiment, the number of support columns 42 is four, including two inner ring support columns 42 and two outer ring support columns 42. The inner ring support columns 42 are located on the second ring of the spiral line 6 from the inside out, and the outer ring support columns 42 are located on the second ring of the spiral line 6 from the outside in.

[0050] Within any one of the support columns 42, the support column 42 is composed of multiple columns, with gaps between adjacent columns.

[0051] With the above improvements, the support column 42 is set on the side close to the first opening 41, and the support column 42 is set to be composed of multiple columns with gaps. While providing support by utilizing the distribution of vortex lines, the support column 42 will not block airflow and rainwater.

[0052] In an optional embodiment, the lower umbrella skirt 5 is further provided with waist holes 52 at the positions corresponding to the support plate 43. Each waist hole 52 is located on the outer side of the corresponding support plate 43. The outer side of the support plate 43 refers to the side of the support plate 43 away from the axis of the core rod 2.

[0053] Through the above improvements, by setting waist holes 52 on the lower umbrella skirt 5, when the airflow blows from bottom to top to the lower umbrella skirt 5, the airflow passes through waist holes 52 and is discharged to the upper umbrella skirt 4, so that the upper umbrella skirt 4 shares the pressure of the lower umbrella skirt 5, and avoids the umbrella skirt from being unable to withstand the tension and breaking when the airflow blows upward. At the same time, the waist holes 52 are set on the lower umbrella skirt 5 at the position corresponding to the outer side of the support plate 43, and the support plate 43 is used to cover the waist holes 52, reducing the possibility of water flowing through the waist holes 52 or dust clogging the waist holes 52.

[0054] In one optional embodiment, the support plate 43 is a straight plate structure, and the inner side of each support plate 43 is tangent to the arc at the corresponding position of the vortex line 6; or, the support plate 43 is an arc plate structure, and the inner side of each support plate 43 coincides with the arc at the corresponding position of the vortex line 6.

[0055] In an optional embodiment, the center of the column on each support column 42 is located on the spiral line 6.

[0056] In an optional embodiment, the support plate 43 is provided with a chamfered bevel 431 at the end near the lower umbrella skirt 5, the chamfered bevel 431 being located on the outer side near the support plate 43.

[0057] In an optional embodiment, the top fitting 1 and the bottom fitting 3 are threadedly fixed to the core rod 2, the bottom fitting 3 being a threaded rod for fixing the insulator to the base, and the top fitting 1 being a clamp for supporting and fixing the cable.

[0058] It should be noted that the base refers to cable support infrastructure such as utility poles.

[0059] In an optional embodiment, the opening widths of the first opening 41 and the second opening 51 gradually increase from the side closer to the core rod 2 to the side farther away from the core rod 2.

[0060] It should be noted that the opening width of the first opening 41 and the second opening 51 gradually increases from the side closer to the core rod 2 to the side farther away from the core rod 2, and the range of the opening width is 5 to 15 mm.

[0061] Through the above improvements, the gradient design of the opening width can more efficiently guide the airflow into the interlayer between the upper umbrella skirt 4 and the lower umbrella skirt 5, enhance the cleaning power of the airflow on the dust in the interlayer, and at the same time, the gradient structure can reduce stress concentration at the opening, further improving the durability of the umbrella skirt.

[0062] This high-voltage, corrosion-resistant composite insulator achieves enhanced durability, improved corrosion resistance, and a balanced performance through a multi-dimensional structural design. Its core working principle is as follows:

[0063] I. Principle of Stress Relief from Thermal Expansion and Contraction

[0064] The first opening in the upper shed and the second opening in the lower shed are crucial for stress relief. When the ambient temperature changes, the sheds will experience expansion stress due to thermal expansion and contraction. The opening structure provides a buffer space for this volume change, directly eliminating stress concentration and preventing the sheds from cracking or deforming due to long-term stress accumulation. This strengthens the insulator's durability and ensures structural stability under extreme temperature conditions.

[0065] II. Waterproofing and Double-Layer Protection Principle

[0066] Waterproof performance guaranteed: The first and second openings are staggered (e.g., symmetrically positioned). Even if rainwater seeps in through the first opening, it will be blocked by the lower umbrella skirt and cannot directly contact the core rod, thus solving the problem of reduced waterproof performance that may be caused by the opening design.

[0067] Enhanced double-layer protection: The outer diameter of the lower umbrella skirt is larger than that of the upper umbrella skirt, forming a double-layer umbrella skirt structure with a larger outer diameter and a smaller inner diameter. This design not only expands the protective area but also reduces the direct adhesion of external pollutants (such as dust and moisture) to the core rod surface through layered blocking, while delaying the erosion of the core rod by rainwater and fog, thus improving the overall corrosion resistance and weather resistance.

[0068] III. Principles of Airflow and Pressure Regulation

[0069] Airflow guidance and cleaning: The vortex distribution of the opening structure, support columns, and support plates forms an orderly airflow channel. The airflow entering from the first opening is guided to both sides by the core rod, then directed to one side of the second opening via the inner ring support plate, and finally discharged through the second opening. In the process, it can carry away dust in the umbrella skirt interlayer, reducing the impact of dirt accumulation.

[0070] Pressure balance: The waist hole design of the lower skirt allows airflow to enter the skirt interlayer from bottom to top, so that the upper skirt shares the airflow pressure borne by the lower skirt, avoiding tearing of a single skirt due to excessive pressure, and further enhancing structural stability.

[0071] IV. Auxiliary Principles of Support Structure

[0072] The vortex-shaped distribution of support columns and plates provides stable support for the upper and lower umbrella skirts without obstructing airflow and rainwater drainage. The support plate, located near the second opening, guides airflow towards the opening for discharge. The support columns, composed of multiple columns with gaps, ensure support strength while allowing space for airflow and rainwater flow, achieving compatibility between support and function.

[0073] In summary, this insulator, through a synergistic design of "open-type pressure relief + staggered waterproofing + double-layer protection + airflow regulation + support assistance," balances waterproofing, corrosion resistance, and structural stability while ensuring endurance performance, making it suitable for long-term reliable operation in high-voltage environments.

[0074] Example 2:

[0075] This embodiment provides a high-voltage, corrosion-resistant composite insulator with the following technical features.

[0076] like Figure 11 As shown, a high-voltage, corrosion-resistant composite insulator includes a core rod 2. The top and bottom ends of the core rod 2 are detachably connected to a top fitting 1 and a bottom fitting 3, respectively. Multiple skirt groups are sleeved on the outside of the core rod 2. Each skirt group includes an upper skirt 4. The upper edge of the upper skirt 4 is provided with a first opening 41. The skirt group also includes a lower skirt 5 located below the upper skirt 4. The outer diameter of the lower skirt 5 is larger than the outer diameter of the upper skirt 4. The lower skirt 5 is provided with a second opening 51. The positions of the first opening 41 and the second opening 51 are staggered.

[0077] In an optional embodiment, the upper umbrella skirt 4 is symmetrically provided with two first openings 41, and the lower umbrella skirt 5 is symmetrically provided with two second openings 51, wherein any second opening 51 and any first opening 41 are located at a 90-degree angle on the circumference of the core rod 2.

[0078] Through the above improvements, two first openings 41 and two second openings 51 are provided on the upper umbrella skirt 4 and the lower umbrella skirt 5, which are evenly distributed and staggered in the circumference. The two first openings 41 guide the air blown from both directions into the interlayer between the upper umbrella skirt 4 and the lower umbrella skirt 5, thereby improving the cleaning effect of the airflow on the dust in the interlayer.

[0079] It should be noted that the opening direction of any first opening 41 and any second opening 51 is opposite to the axis of the mandrel 2.

[0080] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0081] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage, corrosion-resistant composite insulator, comprising a core rod (2), wherein the upper and lower ends of the core rod (2) are respectively detachably connected to a top fitting (1) and a bottom fitting (3), characterized in that: The core rod (2) is fitted with a plurality of umbrella skirt groups on the outside. Each umbrella skirt group includes an upper umbrella skirt (4). The upper edge of the upper umbrella skirt (4) is provided with a first opening (41). The umbrella skirt group also includes a lower umbrella skirt (5) provided below the upper umbrella skirt (4). The outer diameter of the lower umbrella skirt (5) is larger than the outer diameter of the upper umbrella skirt (4). The lower umbrella skirt (5) is provided with a second opening (51). The positions of the first opening (41) and the second opening (51) are staggered. The upper umbrella skirt (4) is provided with a first opening (41), and the lower umbrella skirt (5) is provided with a second opening (51). The first opening (41) and the second opening (51) are located symmetrically on the circumference. The lower surface of the upper umbrella skirt (4) is provided with multiple support plates (43) and multiple support columns (42). Each support column (42) and support plate (43) is provided on the same spiral line (6). The minimum radius of the inner circle of the spiral line (6) is greater than the inner hole radius of the upper umbrella skirt (4) and the lower umbrella skirt (5). The maximum radius of the outer circle of the spiral line (6) is smaller than the outer circle radius of the upper umbrella skirt (4). The spiral line (6) has more than four circles. Each support plate (43) is provided on the side close to the second opening (51), and each support column (42) is provided on the side close to the first opening (41). The number of support plates (43) is four, including two inner ring support plates (43) and two outer ring support plates (43). The inner ring support plates (43) are located on the second ring from the inside out of the vortex line (6), and the outer ring support plates (43) are located on the second ring from the outside in of the vortex line (6). The airflow blown into the interlayer between the upper umbrella skirt (4) and the lower umbrella skirt (5) from the first opening (41) is guided to both sides by the core rod (2). The inner ring support plates (43) guide the airflow blown to both sides to the side closer to the second opening (51), and the corresponding outer ring support plates (43) guide the airflow blown to the side of the second opening (51) to the second opening (51) for discharge.

2. The high-voltage, corrosion-resistant composite insulator according to claim 1, characterized in that, The upper umbrella skirt (4) is symmetrically provided with two first openings (41), and the lower umbrella skirt (5) is symmetrically provided with two second openings (51). Any second opening (51) and any first opening (41) are located at a 90-degree angle on the circumference of the core rod (2).

3. The high-voltage, corrosion-resistant composite insulator according to claim 1, characterized in that, The number of the support columns (42) is four, including two inner ring support columns (42) and two outer ring support columns (42). The inner ring support columns (42) are located on the second ring of the vortex line (6) from the inside out, and the outer ring support columns (42) are located on the second ring of the vortex line (6) from the outside in. Within any support column (42), the support column (42) is composed of multiple columns, with gaps between adjacent columns.

4. A high-voltage, corrosion-resistant composite insulator according to claim 3, characterized in that, The lower umbrella skirt (5) is also provided with waist holes (52) at the position of the corresponding support plate (43). Each waist hole (52) is located on the outside of the corresponding support plate (43). The outside of the support plate (43) refers to the side of the support plate (43) away from the axis of the core rod (2).

5. A high-voltage, corrosion-resistant composite insulator according to claim 1, characterized in that, The support plate (43) is a straight plate structure, and the inner side of each support plate (43) is tangent to the arc of the corresponding position of the vortex line (6); or, the support plate (43) is an arc plate structure, and the inner side of each support plate (43) coincides with the arc of the corresponding position of the vortex line (6).

6. A high-voltage, corrosion-resistant composite insulator according to claim 3, characterized in that, The center of the column on each support column (42) is located on the spiral line (6).

7. A high-voltage, corrosion-resistant composite insulator according to claim 4, characterized in that, The support plate (43) has a chamfered bevel (431) at the end near the lower umbrella skirt (5), and the chamfered bevel (431) is located on the outer side near the support plate (43).

8. A high-voltage, corrosion-resistant composite insulator according to claim 1, characterized in that, The top fitting (1) and bottom fitting (3) are fixed to the core rod (2) by threads. The bottom fitting (3) is a threaded rod used to fix the insulator to the base. The top fitting (1) is a clamp used to support and fix the cable.

9. A high-voltage, corrosion-resistant composite insulator according to claim 1, characterized in that, The opening widths of the first opening (41) and the second opening (51) gradually increase from the side closer to the core rod (2) to the side farther away from the core rod (2).

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