Sectional composite insulator

Abstract

The present application relates to the technical field of insulator, in particular to a sectional composite insulator, which comprises an insulator body and a cover sheet. The insulator body comprises an insulator disc and a steel cap arranged at the upper end of the insulator disc; the cover sheet is sleeved outside the steel cap; the cover sheet comprises: a deformation sheet having a bistable structure and capable of generating a mutation between a positive conical barrel-shaped stable structure and a reverse conical barrel-shaped stable structure in response to changes in ambient temperature; and an insulating shell covering the outer periphery of the deformation sheet. The deformation sheet is composed of two layers of materials with different thermal expansion coefficients. The deformation sheet comprises a superimposed upper layer and a lower layer, and the thermal expansion coefficient of the lower layer is greater than that of the upper layer. It has good anti-pollution performance and can effectively prevent the adhesion and accumulation of bird droppings, dust and other pollutants.

Description

Technical Field

[0001] This invention relates to the field of insulator technology, specifically to a segmented composite insulator. Background Technology

[0002] Insulators are key components in power transmission and distribution systems used to support conductors and electrical equipment and keep them insulated from the ground. Their performance directly affects the safety and reliability of the entire power grid.

[0003] In actual operation, insulators are exposed to the complex and ever-changing outdoor environment for extended periods. Their surfaces easily accumulate pollutants such as bird droppings, dust, and salt, gradually forming a conductive contamination layer. Under humid weather conditions such as fog, dew, and drizzle, this contamination layer becomes moist, leading to a significant decrease in the insulation resistance of the insulator surface, an increase in leakage current, and potentially inducing localized electric arcs. If the arc develops further, it can cause severe flashover accidents, resulting in line tripping or even large-scale power outages, posing a significant threat to the stable operation of the power system.

[0004] Furthermore, in cold and humid environments, insulator surfaces may become covered with ice or snow. Ice and snow cover not only significantly shortens the effective creepage distance of insulators, but also, during the melting process, can cause ice to locally bridge the insulator skirts, forming a highly conductive meltwater film. This further exacerbates the deterioration of insulation performance, increases the risk of ice flashover accidents, and becomes another prominent hidden danger to the safe operation of the power grid. Summary of the Invention

[0005] In order to solve the technical problems existing in the background art, the present invention provides a segmented composite insulator, which has good anti-pollution performance and can effectively prevent the adhesion and accumulation of bird droppings, dust and other dirt.

[0006] The technical solution adopted by this invention to solve its technical problem is:

[0007] A segmented composite insulator includes an insulator body and a cover plate;

[0008] The insulator body includes an insulating disc and a steel cap disposed on the upper end of the insulating disc;

[0009] The cover is fitted over the outside of the steel cap;

[0010] Cover slip includes:

[0011] The deformable plate has a bistable structure and can respond to changes in ambient temperature by abruptly changing between a positive cone-shaped steady-state structure and a negative cone-shaped steady-state structure.

[0012] An insulating shell is used to cover the outer periphery of the deformable sheet.

[0013] Furthermore, the deformation sheet is composed of two layers of materials with different coefficients of thermal expansion.

[0014] Furthermore, the deformable sheet comprises an upper layer and a lower layer stacked together, with the lower layer having a higher coefficient of thermal expansion than the upper layer.

[0015] Furthermore, the upper layer of the deformation sheet is made of Invar alloy, and the lower layer of the deformation sheet is made of manganese-nickel-copper alloy.

[0016] Furthermore, a rotatable flap is provided at the upper end of the cover plate;

[0017] Rotary plates include:

[0018] Rotary hole, which can be rotatably fitted onto the cover plate;

[0019] The blade is located on the outer periphery of the rotating hole.

[0020] Furthermore, when the deformable blade has a reverse cone-shaped steady-state structure, the lower edge of the blade can be matched with the upper end face of the cover plate.

[0021] Furthermore, a striking ring is provided along the outer edge of the insulating shell;

[0022] When the deformable plate abruptly changes from a reverse cone-shaped steady-state structure to a forward cone-shaped steady-state structure, the striking ring is driven and strikes the insulating disk.

[0023] Furthermore, the cover plate is provided with locking holes that engage with the steel cap.

[0024] Furthermore, the insulating shell is made of silicone rubber.

[0025] The beneficial effects of this invention are:

[0026] (1) The deformation sheet adopts a bistable structure, which can change abruptly between a positive cone-shaped steady-state structure and a negative cone-shaped steady-state structure with changes in ambient temperature. During the abrupt change, the cover sheet generates instantaneous deformation and vibration, which effectively shakes off bird droppings, dust and other pollutants attached to the surface, preventing them from accumulating for a long time, helping to keep the surface of the insulator clean, and also preventing ice and snow from adhering.

[0027] (2) When the deformation plate has a reverse cone-shaped steady-state structure, the lower edge of the blade matches the upper surface of the cover plate. During the rotation of the blade, its lower edge will scrape the upper surface of the cover plate, thereby effectively removing the attached dirt and reducing the risk of dirt accumulation.

[0028] (3) When the deformation plate changes abruptly from a reverse cone shape to a forward cone shape, the striking ring is driven and strikes the insulating disc, generating mechanical vibration. The mechanical vibration generated by the striking can effectively shake off dirt from the surface of the insulator, thereby achieving automatic cleaning. This function not only keeps the insulator clean during daily operation, but also prevents ice and snow from adhering to its surface.

[0029] (4) The blade structure can prevent birds from perching on the insulating disc of the insulator, thus reducing bird droppings pollution at the source.

[0030] (5) The deformation sheet is based on a composite design of materials with different coefficients of thermal expansion, which has good stability and long service life. The overall structure is compact and easy to install and maintain.

[0031] (6) The entire device does not require external energy to drive it. It can trigger self-cleaning and anti-icing functions by utilizing changes in the external environment. It is energy-saving, environmentally friendly, and highly reliable. Attached Figure Description

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0034] Figure 2 This is an exploded view of Embodiment 1 of the present invention;

[0035] Figure 3 This is a schematic diagram of the cover plate structure;

[0036] Figure 4 This is a schematic diagram of the deformable sheet structure;

[0037] Figure 5 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0038] Figure 6 This is an exploded view of Embodiment 2 of the present invention;

[0039] Figure 7 This is a schematic diagram of the rotary blade structure;

[0040] Figure 8 This is a schematic diagram of the second embodiment of the present invention in the first working state;

[0041] Figure 9 This is a schematic diagram of the second working state of Embodiment 2 of the present invention.

[0042] In the picture:

[0043] 1. Insulator body, 2. Cover plate, 3. Rotary plate;

[0044] 101. Insulating disc; 102. Steel cap;

[0045] 201. Insulating shell; 202. Clip hole; 203. Deformation plate; 204. Striking ring;

[0046] 301. Rotary hole; 302. Blade. Detailed Implementation

[0047] The present invention will be further described in detail below with reference to the accompanying drawings.

[0048] Example 1

[0049] like Figure 1 , 2 As shown, a segmented composite insulator comprises an insulator body 1 and a cover plate 2. The insulator body 1 includes an insulating disc 101 and a steel cap 102 disposed on the upper end of the insulating disc 101. The insulating disc 101 is made of glass or ceramic. The insulator body 1 is existing technology. The cover plate 2 is fixedly sleeved on the outside of the steel cap 102. The cover plate 2 can cover the upper surface of the insulating disc 101.

[0050] like Figure 3 As shown, the specific structure of the cover plate 2 includes a deformation plate 203. The deformation plate 203 has a bistable structure, which can respond to changes in ambient temperature by abruptly changing between a forward conical steady-state structure and a reverse conical steady-state structure. During the abrupt change, the cover plate 2 can generate instantaneous deformation and vibration, thereby effectively shaking off bird droppings, dust, and other contaminants adhering to the surface, preventing their long-term accumulation, helping to keep the insulator surface clean, and also preventing ice and snow from adhering.

[0051] The cover plate 2 has a locking hole 202 at its center, which engages with the steel cap 102. In the prior art, the steel cap 102 has a raised ring at its lower end, and the locking hole 202 is connected to the raised ring. In a specific embodiment, the locking hole 202 is made of engineering plastic, thereby making the engagement between the locking hole 202 and the steel cap 102 more secure.

[0052] An insulating shell 201 covers the outer periphery of the deformation sheet 203 and has a certain deformation capacity, thereby protecting and insulating the deformation sheet 203. In a specific embodiment, the insulating shell 201 is made of silicone rubber. A striking ring 204 is provided along the outer edge of the insulating shell 201, with its lower end face protruding from the lower end face of the insulating shell 201. In a specific embodiment, the striking ring 204 is made of engineering plastic. When the deformation sheet 203 abruptly changes from a reverse cone-shaped steady-state structure to a forward cone-shaped steady-state structure, the striking ring 204 is driven and strikes the upper end face of the insulating disc 101, generating mechanical vibration. The mechanical vibration generated by the striking can effectively shake off dirt from the surface of the insulator, thereby achieving automatic cleaning. Furthermore, this function not only keeps the insulator clean during daily operation but also prevents ice and snow from adhering to its surface.

[0053] like Figure 4As shown, the deformation plate 203 has a conical structure and is composed of two layers of materials with different coefficients of thermal expansion. Specifically, the deformation plate 203 includes an upper layer and a lower layer stacked together, with the lower layer having a higher coefficient of thermal expansion than the upper layer. In a specific embodiment, the upper layer of the deformation plate 203 is made of Invar alloy, and the lower layer is made of manganese-nickel-copper alloy. The deformation plate 203, based on a composite design of materials with different coefficients of thermal expansion, exhibits good stability and a long lifespan. Its overall structure is compact, easy to install and maintain. Furthermore, the entire device requires no external energy drive, utilizing only changes in the external environment to trigger self-cleaning and anti-icing functions, resulting in energy saving, environmental friendliness, and high reliability.

[0054] The specific working principle is as follows:

[0055] When the ambient temperature rises, the lower layer material of the deformable sheet 203, due to its larger coefficient of thermal expansion, attempts to produce a more significant linear expansion than the upper layer material. This free expansion tendency is constrained by the upper layer material, resulting in compressive stress within the lower layer material and tensile stress within the upper layer material. The stress coupling forces the entire deformable sheet 203 to undergo bending deformation, specifically, the lower layer expands more than the upper layer, causing the cone-shaped structure to tend to become flatter, or even bend in the opposite direction. If the initial state is a positive cone-shaped structure, this process causes it to develop into a negative cone-shaped structure. During this bending process, elastic potential energy continuously accumulates within the elastic body of the deformable sheet 203. This deformation is relatively continuous and slow before reaching a critical point. When the ambient temperature decreases, the contraction of the lower layer material is also greater than that of the upper layer material. Its free contraction tendency is constrained by the upper layer material, resulting in tensile stress in the lower layer and compressive stress in the upper layer. This stress state drives the deformable sheet 203 to bend towards the lower layer. If the initial state is a negative cone-shaped structure, this process causes it to develop into a positive cone-shaped structure. Similar to the heating process, this cooling bending process is also accompanied by the continuous accumulation of strain energy.

[0056] The key feature of this technical solution is that the pre-designed conical geometry of the deformable sheet 203 naturally gives it two stable equilibrium states: a forward conical shape and a reverse conical shape. An unstable equilibrium point exists between these two stable states.

[0057] As the temperature continues to change, the bending deformation of the deformation plate 203 gradually intensifies, and the strain energy stored within it also increases. When the temperature change reaches a certain critical point, the stored strain energy is sufficient to overcome the equilibrium point between two steady states. At this point, the deformation plate 203 no longer undergoes slow, continuous deformation, but instead experiences a rapid, transient elastic jump, quickly switching from one stable state to another. This process is completed suddenly and involves very high acceleration. The instantaneous dynamic impact and acceleration change give the deformation plate 203 itself and its connected or attached components significant kinetic energy, which triggers mechanical vibrations in the structure during the release of this kinetic energy.

[0058] Example 2

[0059] Based on Embodiment 1, a rotatable blade 3 is added, and a rotating connection structure adapted to the blade 3 is provided on the cover plate 2.

[0060] like Figure 5 , 6 As shown, a rotatable flap 3 is provided at the upper end of the cover plate 2. The flap 3 can prevent birds from perching on the insulating disc 101 of the insulator, thereby reducing bird droppings pollution at the source.

[0061] like Figure 7 , 8 As shown in Figure 9, the rotating plate 3 includes a rotating hole 301, which is rotatably fitted onto the cover plate 2. A blade 302 is disposed on the outer periphery of the rotating hole 301. When the deformable plate 203 is in a reverse cone-shaped stable structure, the lower edge of the blade 302 can be adapted to the upper end face of the cover plate 2. During rotation, the lower edge of the blade 302 scrapes against the upper surface of the cover plate 2, effectively removing attached dirt and reducing the risk of dirt accumulation. Furthermore, when the deformable plate 203 forms a reverse cone-shaped stable structure, the upper end face of the cover plate 2 collides with the lower edge of the blade 302, thereby generating mechanical vibration again. This effectively shakes off dirt from the surface of the insulator, achieving automatic cleaning. Moreover, this function not only keeps the insulator clean during daily operation but also prevents ice and snow from adhering to its surface.

[0062] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1.A sectional composite insulator, characterized in that, it comprises an insulator body (1) and a cover sheet (2) ; the insulator body (1) comprises an insulator disc (101) and a steel cap (102) arranged at the upper end of the insulator disc (101) ; the cover sheet (2) is sleeved outside the steel cap (102) ; the cover sheet (2) comprises: a deformation sheet (203) having a bistable structure and capable of generating a mutation between a forward conical barrel-shaped stable structure and a reverse conical barrel-shaped stable structure in response to changes in ambient temperature; an insulating shell (201) covering the outer periphery of the deformation sheet (203). 2.The sectional composite insulator according to claim 1, characterized in that, the deformation sheet (203) is composed of two layers of materials with different thermal expansion coefficients. 3.The sectional composite insulator according to claim 2, characterized in that, the deformation sheet (203) comprises a lower layer and an upper layer which are laminated and combined, and the thermal expansion coefficient of the lower layer is greater than that of the upper layer. 4.The sectional composite insulator according to claim 3, characterized in that, the upper layer of the deformation sheet (203) is made of Invar alloy, and the lower layer of the deformation sheet (203) is made of manganese-nickel-copper alloy. 5.The sectional composite insulator according to claim 1, characterized in that, a rotatable rotating sheet (3) is arranged at the upper end of the cover sheet (2) ; the rotating sheet (3) comprises: a rotating hole (301) which is rotatably sleeved on the cover sheet (2) ; a blade (302) arranged at the outer periphery of the rotating hole (301). 6.The sectional composite insulator according to claim 5, characterized in that, when the deformation sheet (203) is in a reverse conical barrel-shaped stable structure, the lower edge of the blade (302) is adapted to the upper end surface of the cover sheet (2). 7.The sectional composite insulator according to claim 1, characterized in that, a knocking ring (204) is arranged at the outer edge of the insulating shell (201) ; when the deformation sheet (203) generates a mutation from a reverse conical barrel-shaped stable structure to a forward conical barrel-shaped stable structure, the knocking ring (204) is driven and knocks the insulator disc (101). 8.The sectional composite insulator according to claim 1, characterized in that, a clamping hole (202) is arranged on the cover sheet (2), and the clamping hole (202) is clamped with the steel cap (102). 9.The sectional composite insulator according to claim 1, characterized in that, the insulating shell (201) is made of silicone rubber material.

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