Insulator

Abstract

The invention discloses an insulator, which relates to an electrical tool and an electrical insulation technology, and comprises a core rod which is a glass fiber reinforced epoxy resin core rod, and a hard sheath and a hard umbrella skirt are formed outside the core rod; the hard umbrella skirt and the hard sheath are of an integrated structure, and the hard umbrella skirt and the hard sheath are hard resin sheaths; the hardware fitting comprises a high-voltage end hardware fitting and a low-voltage end hardware fitting, two sections of accommodating cavities with different diameters are arranged in the hardware fitting, the diameter of the first accommodating cavity is larger than that of the second accommodating cavity, the first accommodating cavity is used for accommodating the hard sheath, and the second accommodating cavity is used for accommodating the core rod. According to the end connection structure of the insulator provided by the embodiment of the invention, the hard sheath is prevented from wrapping the periphery of the hardware fitting, so that the problem that the hard sheath is easy to crack due to inconsistent deformation of the hard sheath and the hardware fitting under temperature or tensile load caused by the end connection structure in the prior art can be well solved.

Description

Technical Field

[0001] This application relates to the technical fields of electrical tools and electrical insulation, and particularly to an insulator. Background Art

[0002] With the continuous advancement of the industrialization process, electricity has become an indispensable key energy source for driving industrial development. In order to ensure the effective transmission of electricity from resource-rich areas to industrial concentration areas, insulators, as key components for ensuring external insulation in the power transmission system, play a crucial role.

[0003] Currently, the insulator market is mainly composed of three categories: glass insulators, ceramic insulators, and composite insulators. Among them, composite insulators exhibit unique advantages in high-voltage transmission lines and heavily polluted environments due to their light weight, easy manufacturability, and excellent anti-pollution performance. However, with the widespread application of composite insulators, a series of problems have gradually emerged, and the most prominent one is the bird damage problem. The long-term pecking behavior of birds can directly cause the soft protective layer of composite insulators to be penetrated, thereby exposing the internal core body. The core body exposed to the harsh environment for a long time is vulnerable to corrosion and brittle fracture, which may lead to serious power failures. This problem has attracted great attention from the power sector and has prompted them to try various physical protection measures, such as installing anti-bird spikes, adopting ultrasonic bird repellent technology, and adding a hard protective shell outside the soft protective layer. However, due to factors such as complex installation, inconvenient processing and maintenance, these measures have not achieved the desired protection effect.

[0004] To address this challenge, the industry has proposed a solution, that is, using a hard sheath material to replace the original soft sheath of composite insulators. This hard sheath is usually made of alicyclic epoxy resin. Although it has high hardness, it also has a certain degree of brittleness. During processing and use, especially at the contact end of the hard sheath and the fitting, due to the significant differences in the thermal expansion coefficient and elastic modulus between the two, the hard sheath is extremely prone to cracking under temperature changes or load effects. Especially in the existing hard insulator designs, the hard sheath is usually tightly wrapped around the fitting by direct casting or injection molding (as shown in Figure 1 and Figure 2 ). This connection method, during processing or use, due to the significant differences in the thermal expansion coefficient and elastic modulus between the hard alicyclic epoxy resin sheath and the metal fitting, makes the hard sheath wrapped around the fitting extremely prone to cracking under the influence of thermal expansion and contraction or tensile load. Summary of the Invention

[0005] The embodiments of this application provide an insulator to solve the problem that the hard sheath is prone to cracking due to inconsistent deformation between the hard sheath and the fitting under temperature or tensile load caused by the end connection structure of the prior art.

[0006] An embodiment of the present application provides an insulator, including: a core rod 5, a rigid umbrella skirt 2, a rigid sheath 3, and fittings, where,

[0007] The core rod 5 is an epoxy resin core rod reinforced with glass fiber, and the rigid sheath 3 and the rigid umbrella skirt 2 are formed outside the core rod 5;

[0008] The rigid umbrella skirt 2 and the rigid sheath 3 are of an integral structure, and the rigid umbrella skirt 2 and the rigid sheath 3 are rigid resin sheaths;

[0009] The fittings include a high-voltage end fitting 1 and a low-voltage end fitting 4. Two accommodation cavities with different diameters are arranged inside the fittings, where the diameter of the first accommodation cavity is larger than that of the second accommodation cavity. The first accommodation cavity is used to accommodate the rigid sheath 3, and the second accommodation cavity is used to accommodate the core rod 5.

[0010] Optionally, the edge thickness of the rigid umbrella skirt 2 is 1 mm to 3 mm, and the root thickness of the rigid umbrella skirt 2 is 3 mm to 8 mm;

[0011] The thickness of the rigid sheath 3 is 4 mm to 8 mm;

[0012] The rigid umbrella skirt 2 and the rigid sheath 3 are of an integrally injection-molded structure;

[0013] The glass transition temperature of the rigid umbrella skirt 2 and the rigid sheath 3 is not lower than 20 °C, and the surface hardness is not lower than Shore hardness 90A.

[0014] Optionally, at least two annular sealing grooves are provided in the first accommodation cavity of the fittings, and sealing washers are arranged in the annular sealing grooves.

[0015] Optionally, the fittings are divided into a crimping area and a non-crimping area in the length direction. The crimping area is the length section of the fittings corresponding to the second accommodation cavity, and the non-crimping area is the length section of the fittings corresponding to the first accommodation cavity.

[0016] Optionally, the length of the non-crimping area is 10 mm to 30 mm, and the length of the crimping area is 20 mm to 80 mm.

[0017] Optionally, the inner diameter of the first accommodation cavity is 28 mm to 40 mm, the depth is 5 mm to 20 mm, the inner diameter of the second accommodation cavity is 20 mm to 32 mm, and the depth is 20 mm to 80 mm.

[0018] Optionally, the rigid umbrella skirt 2 adopts an equal-diameter umbrella skirt; or,

[0019] The rigid umbrella skirt 2 adopts a double-umbrella skirt structure with large umbrella skirts and small umbrella skirts arranged alternately; or,

[0020] The hard umbrella skirt 2 adopts a three-umbrella skirt structure with large umbrella skirts, small umbrella skirts, and small umbrella skirts arranged alternately.

[0021] Optionally, the diameter of the core rod is 20 mm to 60 mm.

[0022] The end connection structure of the insulator in the embodiment of the present application can well solve the problem that the hard sheath is prone to cracking due to inconsistent deformation between the hard sheath and the fitting under temperature or tensile load caused by the end connection structure of the prior art, because it avoids the wrapping of the hard sheath around the fitting.

[0023] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the following specifically illustrates the specific embodiments of the present application. Description of the Drawings

[0024] By reading the following detailed description of the preferred embodiments, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. And throughout the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0025] Figure 1 It is a schematic diagram of the overall structure and a partial cross-sectional view of a hard insulator in the prior art;

[0026] Figure 2 It is a partially enlarged view of the end connection structure of a hard insulator in the prior art;

[0027] Figure 3 It is a schematic diagram of the structure and a partial cross-sectional view of the insulator in the embodiment of the present application;

[0028] Figure 4 It is an enlarged view of the end connection structure of the insulator in the embodiment of the present application. Detailed Embodiments

[0029] Hereinafter, the exemplary embodiments of the present disclosure will be described in more detail with reference to the drawings. Although the exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be fully conveyed to those skilled in the art.

[0030] Composite insulators with a hard sheath material, as one of the current solutions to the problem of bird pecking, are typically represented by sheaths made of alicyclic epoxy resins. However, while this material provides sufficient hardness, it also brings the problem of brittleness, especially at the contact ends between the insulator and the fitting, where the problem is particularly prominent. In the prior art, the fitting ends of hard insulators generally adopt a connection method of directly casting or injecting the hard sheath around the fitting. In the processing or use of this design, due to the significant mismatch in thermal expansion coefficients and elastic properties between the alicyclic epoxy resin sheath and the fitting, when the two are subjected to thermal expansion and contraction or tensile loads, the hard sheath is extremely prone to cracking around the fitting.

[0031] As Figure 1 and 2 shown, in the prior art, the connection ends of the hard insulators between the fittings 1, 4 and the hard sheath 3 adopt a connection structure of directly wrapping the hard sheath 3 around the fitting 1 or 4. When using this structure, the requirement for the deformation coordination between the fitting and the hard sheath 3 wrapped around it is very high. In actual applications, since the insulator needs to be placed in an outdoor environment, it is inevitable to withstand the thermal shock brought by the environmental temperature. However, because the fitting 1 (or 4) made of metal material and the hard sheath 3 made of resin material often have very different thermal expansion coefficients, and the thermal expansion coefficient of the resin material is often lower than that of the metal material, the direct problem brought about is that the deformation caused by the thermal expansion and contraction of the metal will be restricted by the hard sheath 3 on the periphery, and this restriction will also be converted into a load applied to the hard sheath 3. And because the hard sheath 3 is a hard and brittle material, it is very easy to crack under the action of this load. At the same time, in addition to withstanding the thermal shock brought by the environmental temperature change, the insulators applied outdoors often also need to withstand the tensile load applied through both ends of the fitting. Under the action of this tensile load, the overall insulator will produce axial deformation due to the tensile force. At this time, there will also be a problem of inconsistent deformation between the metal fitting 1 (or 4) and the hard resin hard sheath 3, and their elastic moduli are very different. Therefore, the consequence is the cracking of the outer hard sheath due to the inconsistent internal and external deformation capabilities.

[0032] Based on this, an embodiment of the present application provides an insulator, as Figure 3 , Figure 4 shown, including: a core rod 5, a hard petticoat 2, a hard sheath 3 and a fitting, wherein,

[0033] The core rod 5 is a glass fiber-reinforced epoxy resin core rod, and the hard sheath 3 and the hard petticoat 2 are formed outside the core rod 5;

[0034] The hard petticoat 2 and the hard sheath 3 are of an integral structure, and the hard petticoat 2 and the hard sheath 3 are hard resin sheaths;

[0035] The fitting includes a high-voltage terminal fitting 1 and a low-voltage terminal fitting 4. There are two accommodation cavities with different diameters inside the fitting. The diameter of the first accommodation cavity is larger than that of the second accommodation cavity. The first accommodation cavity is used to accommodate the hard sheath 3, and the second accommodation cavity is used to accommodate the core rod 5.

[0036] In some embodiments, the edge thickness of the hard umbrella skirt 2 is 1 mm to 3 mm, and the root thickness of the hard umbrella skirt 2 is 3 mm to 8 mm; the thickness of the hard sheath 3 is 4 mm to 8 mm; the hard umbrella skirt 2 and the hard sheath 3 are an integrally injection-molded structure;

[0037] The hard umbrella skirt 2 and the hard sheath 3 have a glass transition temperature of not less than 20 °C and a surface hardness of not less than Shore hardness 90A.

[0038] In some embodiments, at least two annular sealing grooves are provided in the first accommodation cavity of the fitting, and sealing washers are arranged in the annular sealing grooves, that is, the number of sealing grooves is more than two, and sealing washers are arranged in all the sealing grooves.

[0039] In some embodiments, the fitting is divided into a crimping area and a non-crimping area in the length direction. The crimping area is the length section of the fitting corresponding to the second accommodation cavity, and the non-crimping area is the length section of the fitting corresponding to the first accommodation cavity.

[0040] In some embodiments, the length of the non-crimping area is 10 mm to 30 mm, and the length of the crimping area is 20 mm to 80 mm.

[0041] In some embodiments, the inner diameter of the first accommodation cavity is 28 mm to 40 mm, and the depth is 5 mm to 20 mm. The inner diameter of the second accommodation cavity is 20 mm to 32 mm, and the depth is 20 mm to 80 mm.

[0042] In some embodiments, the hard umbrella skirt 2 adopts an equal-diameter umbrella skirt; or, the hard umbrella skirt 2 adopts a double-umbrella skirt structure with large umbrella skirts and small umbrella skirts arranged alternately; or, the hard umbrella skirt 2 adopts a triple-umbrella skirt structure with large umbrella skirts, small umbrella skirts, and small umbrella skirts arranged alternately.

[0043] In some embodiments, the diameter of the core rod is 20 mm to 60 mm.

[0044] Specifically, such as Figure 3 and Figure 4The insulator of the present application and its end connection structure are shown. In the insulator of the present application, the hard sheath 3 extends into the fitting 1 (or 4) internally. Moreover, a first accommodation cavity 8 and a second accommodation cavity 7 with different hole diameters are arranged in the fitting, so as to better realize the connection between the hard sheath and the core rod. The inner diameter of the second accommodation cavity 7 is the same as the outer diameter of the insulator core rod 5 and is used for inserting the core rod 5. The inner diameter of the first accommodation cavity 8 is larger than that of the second accommodation cavity 7, and the inner diameter of the first accommodation cavity 8 is consistent with the outer diameter of the hard sheath 3 and is used for accommodating the hard sheath 3. The advantage of this structural arrangement is that it can well separate the crimping section and the non-crimping section of the fitting. During the processing of the insulator, only the fitting section corresponding to the second accommodation cavity 7 needs to be loaded for crimping to realize the reliable connection between the fitting and the insulator, without applying load to the fitting section corresponding to the first accommodation cavity 8 with the hard sheath 3 inside, which can avoid the cracking of the hard sheath caused by the fitting crimping.

[0045] The insulator of the present application also has a sealing groove opened inside the first accommodation cavity 8 of the fitting, and a sealing gasket 6 is arranged in the sealing groove. In terms of the design of structural dimensions, in combination with the needs of actual engineering applications, the overall dimensions of the hard insulator of the present application are also optimized. The optimized hard insulator uses a glass fiber reinforced epoxy resin core rod with a diameter of 24 mm to 40 mm. The thickness of the hard sheath around the core rod is selected to be 4 to 8 mm, and the hard umbrella skirt adopts a structure of alternating large umbrellas and small umbrellas or a structure of alternating large umbrellas, small umbrellas and small umbrellas.

[0046] As Figure 4 shown, since the end connection structure of the present application avoids the wrapping of the hard sheath around the fitting, it can well solve the problem that the hard sheath is prone to cracking due to inconsistent deformation between the hard sheath and the fitting under temperature or tensile load caused by the end connection structure of the prior art.

[0047] Since the end connection structure of the insulator in the embodiment of the present application avoids the wrapping of the hard sheath around the fitting, it can well solve the problem that the hard sheath is prone to cracking due to inconsistent deformation between the hard sheath and the fitting under temperature or tensile load caused by the end connection structure of the prior art. The insulator implemented in the present application can withstand the trampling of line maintenance workers by virtue of its high surface hardness and mechanical strength, and this characteristic significantly improves the convenience of maintenance and repair work.

[0048] The integrally formed design of the hard sheath and the hard umbrella skirt of the insulator of the present application not only enhances the structural integrity of the product but also improves its overall mechanical and electrical performance.

[0049] The insulator of the present application adopts a special connection structure to replace the traditional wrapping method, effectively solving the problem of cracking of the hard sheath due to thermal expansion and contraction or tensile load, and improving the reliability and durability of the insulator.

[0050] The design of extending the hard sheath into the fitting in the present application enables that even if there are some defects at the interface where the fitting is combined with the hard sheath, serious problems will not be caused by partial discharge and heating, effectively enhancing the tolerance of the insulator to interface defects and improving the safety and stability of the product.

[0051] It should be noted that in each embodiment of the present application, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0052] The serial numbers of the embodiments of the present application above are only for description and do not represent the superiority or inferiority of the embodiments.

[0053] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of these fall within the protection scope of the present application.

Claims

1. An insulator, characterized in that: include: A core rod (5), a hard shed (2), a hard sheath (3) and hardware, wherein: The core rod (5) is a glass fiber reinforced epoxy resin core rod, and the core rod (5) is externally molded with the hard sheath (3) and the hard shed (2); The hard shed (2) and the hard sheath (3) are an integrated structure, and the hard shed (2) and the hard sheath (3) are hard resin sheaths; The hardware comprises a high-voltage end hardware (1) and a low-voltage end hardware (4), wherein two accommodating cavities with different diameters are arranged inside the hardware, wherein the diameter of the first accommodating cavity is larger than the diameter of the second accommodating cavity, the first accommodating cavity is used to accommodate the hard sheath (3), and the second accommodating cavity is used to accommodate the core rod (5).

2. The insulator according to claim 1, characterized in that: The edge thickness of the hard shed (2) is 1 mm to 3 mm, and the root thickness of the hard shed (2) is 3 mm to 8 mm; The thickness of the hard sheath (3) is 4 mm to 8 mm; The hard shed (2) and the hard sheath (3) are an integral structure formed by injection molding; The hard shed (2) and the hard sheath (3) have a glass transition temperature of not less than 20° C. and a surface hardness of not less than 90A Shore A hardness.

3. The insulator according to claim 2, characterized in that: The first accommodating cavity of the hardware is provided with at least two annular sealing grooves, and sealing gaskets are arranged in the annular sealing grooves.

4. The insulator according to claim 1, characterized in that: The hardware is divided into a crimping area and a non-crimping area in the length direction. The crimping area is the hardware length section corresponding to the second accommodating cavity, and the non-crimping area is the hardware length section corresponding to the first accommodating cavity.

5. The insulator according to claim 4, characterized in that: The length of the non-crimping area is 10 mm to 30 mm, and the length of the crimping area is 20 mm to 80 mm.

6. The insulator according to claim 1, characterized in that: The inner diameter of the first accommodating cavity is 28 mm to 40 mm, and the depth is 5 mm to 20 mm. The inner diameter of the second accommodating cavity is 20 mm to 32 mm, and the depth is 20 mm to 80 mm.

7. The insulator according to claim 1, characterized in that: The hard shed (2) is a shed of equal diameter; or The hard shed (2) adopts a double shed structure in which a large shed and a small shed are alternately arranged; or, The hard umbrella skirt (2) adopts a three-umbrella skirt structure in which a large umbrella skirt, a small umbrella skirt and a small umbrella skirt are alternately arranged.

8. The insulator according to claim 1, characterized in that: The diameter of the core rod is 20 mm to 60 mm.

Images