A composite insulator

Abstract

The present application discloses a composite insulator, comprising a core rod, a sheath covering the outer periphery of the core rod, and a hardware fixedly sleeved on the end of the core rod, wherein the hardware is provided with a first cavity and a second cavity connected to each other near the end of the core rod, the diameter of the second cavity is larger than the diameter of the first cavity, the end of the core rod is fixed in the first cavity, and the end of the core rod abuts against the bottom wall of the first cavity, a sealing ring is provided in the second cavity, the sealing ring abuts against the bottom wall of the second cavity, the end face of the hardware near the sheath is a curved surface, the remaining part of the second cavity is filled with sealant, the sealant covers the curved surface and is connected to the sheath, so that the hardware and the sheath are sealed. The composite insulator adopting the above-mentioned end sealing structure can effectively improve the sealing performance of the three-point interface of the hardware, the sheath, and the air.

Description

Technical Field

[0001] The present application relates to the technical field of insulators, and in particular to a composite insulator. Background Art

[0002] Composite insulators are an important component of high-voltage transmission lines, carrying electrical and mechanical properties. During the operation of composite insulators, the sealing problem at the end of the composite insulator directly affects the safety of the core rod, and thus affects the operating stability and service life of the composite insulator. When composite insulators operate under long-term harsh working conditions, if the sealing structure design is poor, the interface adhesion between the high-temperature vulcanized silicone rubber and the end hardware will decrease, and then water vapor will easily enter the sealing surface to corrode the internal structure of the end hardware or corrode the core rod, eventually leading to power safety accidents such as flashover of the composite insulator. Utility Model Content

[0003] In view of the deficiencies in the prior art, the purpose of this application is to provide a composite insulator with excellent structural design and good sealing performance, thereby increasing its service life and operating stability and reducing the accident rate.

[0004] To achieve the above-mentioned purpose, the technical means adopted in the present application are as follows: a composite insulator, comprising a core rod, a sheath covering the outer periphery of the core rod, and a hardware fixedly sleeved on the end of the core rod, the hardware having a first cavity and a second cavity connected to each other near the end of the core rod, the diameter of the second cavity being larger than the diameter of the first cavity, the end of the core rod being fixed in the first cavity, and the end of the core rod abutting the bottom wall of the first cavity, a sealing ring being arranged in the second cavity, the sealing ring abutting the bottom wall of the second cavity, the end face of the hardware near the sheath being a curved surface, the remaining part of the second cavity being filled with sealant, the sealant covering the curved surface and being connected to the sheath, so that the hardware and the sheath are sealed.

[0005] The sealing ring tightly abuts against the side wall of the sheath and the second cavity at the same time, forming an interference fit and producing appropriate elastic deformation. The setting of the sealing ring seals the connection interface between the core rod and the hardware to prevent the entry of external water vapor and cause corrosion and brittle fracture of the core rod.

[0006] Among them, the sealant is room temperature vulcanized silicone rubber, the sealing process is simple and the sealing performance is good.

[0007] The sheath is in close contact with the bottom wall of the second cavity, and can play a certain sealing role at the position where the core rod, the hardware and the sheath are connected.

[0008] Wherein, at least one first sealing groove is arranged around the end surface of the hardware close to the sheath to form a curved surface.

[0009] The cross section of the first sealing groove is rectangular, which is convenient for processing.

[0010] Among them, the side wall of the second cavity is provided with a concave-convex sealing interface, which can increase the contact area between the sealing ring and the side wall of the second cavity, increase the friction force, reduce the risk of movement of the sealing ring, and can further extend the sealing path to prevent external water vapor from entering and enhance the sealing effect.

[0011] Among them, a second sealing groove is arranged on the side wall of the second cavity, and the second sealing groove clamps the sealing ring, which can effectively prevent the sealing ring from shifting, extend the sealing path, prevent the external water vapor from entering, and enhance the sealing effect.

[0012] The edge of the end face of the fitting is surrounded by a protrusion, and the end of the protrusion is an arc surface to form a curved surface. The arc surface can effectively reduce the tip structure of the fitting and effectively optimize the electric field. The sealant covers the curved surface and is connected to the sheath, further increasing the contact area and improving the sealing performance.

[0013] The end surface of the metal fitting close to the sheath is smoothly connected to the outer peripheral surface thereof, which can reduce the tip structure of the metal fitting and effectively optimize the electric field.

[0014] The beneficial effect of the present application is that, different from the prior art, the composite insulator of the present application forms a multiple sealing structure at the interface between the sheath and the hardware by means of sealant, sealing ring and curved surface, which can prevent the entry of external water vapor and cause corrosion and brittle fracture of the core rod, thereby reducing the risk of sealing failure.

[0015] At the same time, the present application can further extend the sealing path by setting a concave-convex sealing interface or a second sealing groove on the side wall of the second cavity of the hardware, prevent the entry of external water vapor, and enhance the sealing effect; and can further limit the position of the sealing ring to prevent the sealing ring from shifting, making the sealing effect more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a partial structure of a composite insulator 100;

[0017] Figure 2 is a cross-sectional view of a hardware fitting 130 in one embodiment of the present application;

[0018] Figure 3 In one embodiment of the present application Figure 1 The enlarged view of point A in the middle;

[0019] Figure 4 is an enlarged view of the connection between the hardware and the mandrel in another embodiment of the present application;

[0020] Figure 5 It is an enlarged view of the connection between the hardware and the core rod in another embodiment of the present application. DETAILED DESCRIPTION

[0021] Upon request, specific embodiments of the present application will be disclosed herein. However, it should be understood that the embodiments disclosed herein are merely typical examples of the present application, which may be embodied in various forms. Therefore, the specific details disclosed herein are not considered to be restrictive, but only as a basis for the claims and as a representative basis for teaching those skilled in the art to apply the present application in various ways in practice in any appropriate manner, including using the various features disclosed herein and combining features that may not be explicitly disclosed herein.

[0022] In one embodiment, see Figure 1 The composite insulator 100 includes a core rod 110, a sheath 120 covering and fixed to the outer periphery of the core rod 110, and a hardware 130 fixedly sleeved on the end of the core rod 110. The core rod 110 is a solid structure with a circular cross-section, specifically a solid rod formed by pultrusion of glass fiber impregnated with epoxy resin, and has good mechanical properties and electrical insulation properties. In other embodiments, the cross-section of the core rod can also be any other shape, such as rectangular, elliptical, I-shaped, T-shaped, etc. The core rod can also be pultruded by other materials such as aramid fiber impregnated with epoxy resin, and can be designed according to actual needs, and no specific restrictions are made here.

[0023] At least one shed 121 is provided on the sheath 120, and the shed 121 is provided on the outer wall of the sheath 120. The sheath 120 is entirely covered and fixed on the outer periphery of the core rod 110, but does not cover the portion of the core rod 110 inserted into the hardware 130 and tightly connected to the inner wall of the hardware 130. The sheath 120 and the shed 121 are both made of high-temperature vulcanized silicone rubber, and are covered and fixed on the outer periphery of the core rod 110 by overall vacuum injection molding. The overall injection molding of high-temperature vulcanized silicone rubber can ensure that there are no bubbles inside the sheath 120 and the shed 121, and ensure the reliability of interface bonding, thereby improving the external insulation performance and service life of the composite insulator 100 as a whole. In other embodiments, the sheath and the shed can also be made of other rubber materials or insulating materials, and can also be covered and fixed on the outer periphery of the core rod by other processes such as molding, or the sheath and the shed can also be made separately and then combined together by an adhesive.

[0024] The hardware 130 is an end fitting that can be used to connect the composite insulator 100 to a supporting structure, a conductor, a device, or another composite insulator. In the present embodiment, the hardware 130 is a foot ball type hardware, which is made of high-strength alloy steel 40Cr steel profile and has reliable mechanical properties. In other embodiments, the hardware can also be a socket type hardware, a slot type hardware, a flat angle type hardware, a Y type hardware and a ring type hardware, or any other metal accessories with a connecting function, and can also be made of other metal materials. It can be designed according to actual needs, and no specific restrictions are made here. It should be noted that no matter what type of hardware 130 is, the connection method between it and the core rod 110 and the sheath 120 is universal.

[0025] Combination Figure 1 , Figure 2 and Figure 3 As shown, the end of the composite insulator 100 adopts a multiple sealing structure of a sealing ring 140, a sealing glue 180, and a curved surface. Specifically, the end of the metal fitting 130 close to the core rod 110 is provided with a first cavity 150 and a second cavity 160 connected to each other, the diameter of the second cavity 160 is larger than the diameter of the first cavity 150, the end of the core rod 110 is fixed in the first cavity 150, and the end of the core rod 110 abuts against the bottom wall of the first cavity 150. The sheath 120 extends into the second cavity 160 and abuts against the bottom wall of the second cavity 160. A sealing ring 140 is arranged around the sheath 120 in the second cavity 160. The sealing ring 140 abuts against the bottom wall of the second cavity 160 and the side wall of the second cavity 160. The end face of the hardware 130 close to the sheath 120 is a curved surface. The remaining part of the second cavity 160 is filled with sealant 180. The sealant 180 covers the curved surface and is connected to the sheath 120, so that the hardware 130 and the sheath 120 are sealed. The sealant 180 extends from the second cavity 160 to the curved surface and the sheath 120. The setting of the curved surface can increase the contact area between the hardware 130 and the sealant 180, thereby further strengthening the sealing connection between the hardware 130 and the sheath 120. At the same time, the sealing ring 140 and the sealant 180 form a double seal at the connection between the sheath 120 and the hardware 130, which can prevent the entry of external water vapor and cause corrosion and brittle fracture of the core rod 110, thereby reducing the risk of sealing failure.

[0026] In this embodiment, the cross-sectional shape and size of the first cavity 150 match the cross-sectional shape of the mandrel 110, that is, the cross-sectional shapes of the first cavity 150 and the mandrel 110 are both circular, and the inner diameter of the first cavity 150 is equivalent to the diameter of the mandrel 110, that is, the inner diameter of the first cavity 150 can be slightly larger than or equal to the diameter of the mandrel 110, which is conducive to fixing the mandrel 110 in the first cavity 150 by crimping or the like, and ensuring the connection strength between the hardware 130 and the mandrel 110. In other embodiments, the cross-sectional shapes of the first cavity and the mandrel can also be correspondingly set to other shapes, such as rectangle, triangle, etc., or the cross-sectional shape of the first cavity can also be different from that of the mandrel, as long as the fixed connection between the hardware and the mandrel can be achieved, and no specific limitation is made here.

[0027] The mandrel 110 is fixed in the first cavity 150 of the hardware 130 by a crimping process, so that the end of the mandrel 110 abuts against the bottom wall of the first cavity 150. Since the diameter of the second cavity 160 is larger than the diameter of the first cavity 150, the end of the sheath 120 covering the periphery of the mandrel 110 can be tightly abutted against the bottom wall of the second cavity 160, which can play a certain sealing role on the interface connecting the mandrel 110, the hardware 130, and the sheath 120. In other embodiments, the mandrel can also be fixed by other methods such as gluing, as long as the hardware and the mandrel can be reliably connected, and no specific limitation is made here.

[0028] See also Figure 3 A sealing ring 140 is arranged around the sheath 120 in the second cavity 160, and the sealing ring 140 abuts against the bottom wall of the second cavity 160. After the core rod 110 covered with the sheath 120 is crimped into the first cavity 150 of the hardware 130, the sealing ring 140 is placed at the bottom of the second cavity 160 of the hardware 130 and is tightly abutted against the sheath 120 and the side wall of the second cavity 160 at the same time, forming an interference fit, generating appropriate elastic deformation, and playing the role of sealing the connection interface between the core rod 110 and the hardware 130, preventing the external water vapor from entering and causing the core rod 110 to corrode and fracture and the internal structure of the hardware 130 to corrode. Among them, the sealing ring 140 is a closed O-ring made of high-temperature vulcanized silicone rubber. The sealing ring 140 made of high-temperature vulcanized silicone rubber has excellent aging resistance and can maintain good sealing performance in a long-term harsh environment. In other embodiments, the sealing ring may also be in any other shape such as square, U-shaped, etc., the sealing ring may also be an open type sealing ring, or may also be made of other rubber materials or elastic insulating materials, which are not specifically limited here.

[0029] At least one first sealing groove 170 is arranged around the end surface of the fitting 130 close to the sleeve 120, and the end edge of the fitting 130 close to the sleeve is an arc surface, so that the end surface of the fitting 130 close to the sleeve is a curved surface with a concave-convex structure, and the remaining part of the second cavity 160 of the fitting 130 is filled with sealant 180, and the sealant 180 covers the above-mentioned curved surface and is connected to the sleeve 120, so that the fitting 130 and the sleeve 120 are sealed. The setting of the curved surface increases the contact area between the hardware 130 and the sealant 180, extends the sealing path, and has a better sealing effect. The sealant 180 covers the entire curved surface of the hardware 130 and extends to connect to the sheath 120, further strengthening the sealing connection between the hardware 130 and the sheath 120. The sealing ring 140, the sealant 180, and the curved surface with the sealing groove 170 cooperate with each other to form a multiple sealing structure at the interface where the sheath 120 and the hardware 130 are connected, which can prevent external water vapor from entering and corroding the internal structure of the hardware 130 and causing corrosion and brittle fracture of the core rod 110, thereby reducing the risk of sealing failure.

[0030] In one embodiment, the outer peripheral surface of the end of the hardware 130 close to the sheath 120 is a cylindrical surface, and the end surface of the hardware 130 close to the sheath 120 is smoothly connected to its outer peripheral surface. By setting the first sealing groove 170, the end surface of the hardware 130 close to the sheath 120 can be a curved surface, thereby enhancing the sealing effect between the sheath 120 and the hardware 130, and the end surface of the hardware 130 is smoothly connected to its outer peripheral surface, which can also reduce the tip structure of the hardware 130 and effectively optimize the electric field.

[0031] Furthermore, a protrusion 131 is connected around the edge of the end face of the hardware 130, and the end of the protrusion 131 is an arc surface, so that the end face of the hardware 130 close to the sheath 120 is a curved surface with a more complex structure. When the sealant 180 is filled in the remaining part of the second cavity 160 of the hardware 130 so that it covers the above-mentioned curved surface and is connected to the sheath 120, the contact area between the sealant 180 and the hardware 130 can be further increased, and the sealing path between the two can be extended, thereby enhancing the sealing effect between the sheath 120 and the hardware 130. In addition, the setting of the arc surface can also effectively reduce the tip structure of the hardware 130 and effectively optimize the electric field.

[0032] The cross section of the first sealing groove 170 is rectangular, which is convenient for processing. In other embodiments, the cross section of the first sealing groove may also be circular, triangular or any other shape, which is not specifically limited here.

[0033] The sealant 180 is room temperature vulcanized silicone rubber, which has a simple sealing process and good sealing performance, and has a certain bonding strength, which is helpful for the sealed connection between the hardware 130 and the sheath 120. In other embodiments, the sealant can be other rubber materials or insulating sealing materials, as long as it can seal the connection between the core rod and the hardware, and is not specifically limited here.

[0034] In another embodiment, see Figure 4 In order to further enhance the sealing effect of the end sealing structure of the composite insulator, the side wall of the second cavity of the hardware 230 is provided with a concavo-convex sealing interface. Specifically, the contact between the second cavity and the sealing ring 240 is provided with a concavo-convex shape. When the core rod 210 is crimped into the first cavity, the sealing ring 240 will closely contact the concavo-convex surface of the side wall of the second cavity, the bottom wall of the second cavity and the outer side of the sheath 220. The concavo-convex surface of the side wall of the second cavity can extend the sealing path, prevent the entry of external water vapor, and increase the contact area between the sealing ring 240 and the hardware 230, thereby increasing the friction between the sealing ring 240 and the hardware 230 and reducing the risk of movement of the sealing ring 240. In other embodiments, the concavo-convex sealing interface can also be located on the entire inner surface of the second cavity. When the sealant is filled into the remaining part of the second cavity, the sealant will be in full and close contact with the concavo-convex surface in the second cavity, further extending the sealing path, preventing the entry of external water vapor, and enhancing the sealing effect. The shape of the concave-convex interface may be wavy, sawtooth or irregular, etc., which is not specifically limited here. The other structures of the composite insulator are as described above, and will not be described in detail.

[0035] In yet another embodiment, see Figure 5 In order to further enhance the sealing effect of the end sealing structure of the composite insulator, a second sealing groove 332 is provided on the side wall of the second cavity of the hardware 330, and the second sealing groove 332 is clamped with the sealing ring 340. Specifically, the second sealing groove 332 is provided at the contact point between the second cavity and the sealing ring 340. When the core rod 310 is crimped into the first cavity, the sealing ring 340 will be tightly clamped in the second sealing groove 332, and tightly abut the bottom wall of the second cavity of the hardware 330 and the outer side of the sheath 320, which can further extend the sealing path and prevent the entry of external water vapor. At the same time, the setting of the second sealing groove 332 limits the position of the sealing ring 340, which can prevent the sealing ring 340 from moving, and the sealing effect is more stable. The other structures of the composite insulator are as described above, and the details are not repeated here.

[0036] The cross section of the second sealing groove 332 is rectangular, which is convenient for processing. In other embodiments, in order to be clamped with sealing rings of different shapes, the cross section of the second sealing groove can also be any other shape such as circular, triangular, etc., which is not specifically limited here.

[0037] The present application also provides a method for manufacturing a composite insulator 100, which specifically includes the following steps:

[0038] S11: injecting a high temperature vulcanized silicone rubber molding sheath 120 on the central periphery of the core rod 110 to obtain a first insulator preform.

[0039] Prior to this step, step S01 is included: preparing the core rod 110 by pultrusion molding process. Specifically, firstly, a plurality of fiber yarns are impregnated with resin and enter the molding device to be cured at high temperature to form a core rod preform; then the core rod preform is pulled by the traction device to move along the pultrusion forward direction, and the core rod preform is continuously formed; finally, the core rod preform is cut according to the preset length by the cutting device to obtain the core rod 110 of corresponding specifications. Among them, the molding device includes a pultrusion die, which is used to solidify the fiber yarn impregnated with resin into a corresponding shape. The pultrusion die can be selected according to the specific structure of the core rod 110 required by the composite insulator 100; and the traction device and the cutting device can adopt the equipment in the prior art, as long as they can achieve the corresponding functions, and no specific restrictions are made here.

[0040] In this step, firstly, a coupling agent is coated on the middle periphery of the core rod 110 and dried; then, the core rod 110 is placed in an injection mold of an injection machine, silicone rubber raw material is added, and high-temperature vulcanized silicone rubber is injected on the middle periphery of the core rod 110, and a sheath 120 is formed after cooling, thereby obtaining a first insulator preform. Among them, the middle part of the core rod 110 refers to the part of the core rod 110 except the areas at both ends for connecting the hardware 130, so that the overall length of the sheath injection area in the middle of the core rod 110 must match its hardware connection area, otherwise if the injection area of ​​the sheath 120 on the core rod 110 is too long, the length of the connection area of ​​the hardware 130 on the core rod 110 will be shortened, resulting in the inability to connect the hardware 130 in place, affecting the mechanical strength of the composite insulator 100; if the injection area of ​​the sheath 120 on the core rod 110 is too short, when the hardware 130 is connected to the end of the core rod 110, a gap will be left between the sheath 120 and the hardware 130, affecting the sealing performance of the composite insulator 100.

[0041] In an application scenario, it is also necessary to prepare an shed 121 on the periphery of the sheath 120. Specifically, the sheath 120 and the shed 121 can be integrally formed, that is, after replacing and installing the corresponding injection mold in the injection machine, the core rod 110 is placed therein and the sheath 120 and the shed 121 are integrally injection molded on the periphery of the middle part of the core rod 110 to obtain a first insulator preform. The specific injection process is as described above and will not be repeated; or, the sheath 120 and the shed 121 can also be prepared in sequence, that is, the shed 121 is prepared by an extrusion and shed process on the periphery of the preformed sheath 120. The extrusion and shed process can be implemented by existing technology and is not specifically limited here.

[0042] S12: crimping fittings 130 at both ends of the core rod 110 to obtain a second insulator preform.

[0043] In this step, first, a hardware fitting 130 is crimped on one end of the core rod 110. Specifically, a hardware fitting 130 is sleeved on one end of the core rod 110 manually or by equipment, so that one end of the core rod 110 abuts against the bottom wall of the first cavity 150, and one end of the sheath 120 abuts against the bottom wall of the second cavity 160; then the hardware fitting 130 is crimped and fixed to one end of the core rod 110 by a crimping machine. Then, the hardware fitting 130 is also crimped on the other end of the core rod 110, that is, the two ends of the core rod 110 are turned around, and another hardware fitting 130 is sleeved and crimped and fixed on the other end of the core rod 110 to obtain a second insulator preform. The specific sleeve and crimping process is as described above and will not be repeated. Among them, the crimping machine and the corresponding operation method can be implemented using existing technologies, and no specific restrictions are made here.

[0044] S13: performing sealing processing at the target contact area of ​​the core rod 110 , the sheath 120 and the hardware 130 to obtain the composite insulator 100 .

[0045] In this step, the specific steps of the sealing process include S131 and S132, which are as follows:

[0046] S131 : Dispose a sealing ring 140 around the sheath 120 in the second cavity 160 , so that the sealing ring 140 abuts against the bottom wall of the second cavity 160 and the side wall of the second cavity 160 .

[0047] In one application scenario, the sealing ring 140 is an open type sealing ring. In this step, the sealing ring 140 is first placed in the second cavity 160 of the hardware 130 at one end of the mandrel 110, and then the sealing ring 140 is moved and adjusted so that the sealing ring 140 is arranged around the sheath 120 and the open ends of the sealing ring 140 are neatly aligned or overlapped, and the sealing ring 140 is abutted against the bottom wall of the second cavity 160 and the side wall of the second cavity 160, thereby completing the installation of one sealing ring 140. The sealing ring 140 in the hardware 130 at the other end of the mandrel 110 is also installed according to the above steps, which will not be repeated here.

[0048] In another application scenario, the sealing ring 140 is a closed sealing ring. After step S11 and before step S12, step S111 is also included: first, two sealing rings 140 are respectively sleeved on the two ends of the sheath 120, so as to avoid that after the end of the mandrel 110 is crimped with the hardware 130, the sealing ring 140 cannot be sleeved on the outer periphery of the sheath 120 along the hardware 130 because the inner diameter of the sealing ring 140 is smaller than the outer periphery of the hardware 130. In step S131, the sealing ring 140 pre-sleeved on the outer periphery of one end of the sheath 120 is placed in the second cavity 160 of the corresponding hardware 130, and then the sealing ring 140 is moved and adjusted so that the sealing ring 140 abuts against the bottom wall of the second cavity 160 and the side wall of the second cavity 160, thereby completing the installation of one sealing ring 140. The sealing ring 140 at the other end of the sheath 120 is also installed according to the above steps, which will not be repeated here.

[0049] In another application scenario, a concave-convex sealing interface is set on the side wall of the second cavity of the hardware 230. Therefore, no matter what structure the sealing ring 240 adopts, in this step, it is necessary to move and adjust the sealing ring 240 so that the sealing ring 240 abuts against the bottom wall of the second cavity, the concave-convex surface of the side wall of the second cavity and the outer side of the sleeve 220. The remaining installation operations are as described above and will not be repeated here.

[0050] In another application scenario, a second sealing groove 332 is set on the side wall of the second cavity of the hardware 330. Therefore, no matter what structure the sealing ring 340 adopts, in this step, it is necessary to move and adjust the sealing ring 340 so that the sealing ring 340 is clamped in the second sealing groove 332 and abuts against the bottom wall of the second cavity and the outer side of the sleeve 320. The remaining installation operations are as described above and will not be repeated here.

[0051] S132 : Fill the remaining portion of the second cavity 160 with the sealant 180 , so that the sealant 180 covers the curved surface of the hardware 130 and is sealed and connected to the sheath 120 .

[0052] In this step, the second insulator preform is first placed vertically by manual labor or tooling equipment such as a bracket, and a hardware fitting 130 located below the second insulator preform is sealed with glue, that is, the remaining part of the second cavity 160 of the hardware fitting 130 is filled with sealant 180, so that the sealant 180 covers the curved surface of the hardware fitting 130 and is sealed and connected to the sheath 120, and then the sealant 180 is cured and formed by room temperature curing or heating curing; then the two ends of the second insulator preform are turned so that it is still placed in the vertical direction, and the above-mentioned sealing treatment is performed on another hardware fitting 130 located below the second insulator preform to obtain a composite insulator 100.

[0053] When the hardware 130 is sealed with glue, after a sufficient amount of sealant 180 is filled in the remaining part of the second cavity 160 of the hardware 130, a tool such as a right-angle scraper can be used to remove excess sealant 180. Specifically, one of the right-angled edges of the right-angle scraper is first set close to the core rod 110, and the other right-angled edge adjacent to it abuts against the end of the hardware 130 close to the sheath 120; then the right-angle scraper is horizontally rotated 360° with the core rod 110 as the center, so that the sealant 180 evenly covers the curved surface of the hardware 130 and is sealed with the sheath 120, effectively avoiding uneven distribution of the sealant 180 in the second cavity 160 and affecting the sealing effect of the composite insulator 100.

[0054] The composite insulator of the present application forms a multiple sealing structure at the interface between the sheath and the hardware by means of sealant, sealing ring and curved surface, which can prevent the entry of external water vapor and cause corrosion and brittle fracture of the core rod, thereby reducing the risk of sealing failure.

[0055] At the same time, the present application can further extend the sealing path by setting a concave-convex sealing interface or a second sealing groove on the side wall of the second cavity of the hardware, prevent the entry of external water vapor, and enhance the sealing effect; and can further limit the position of the sealing ring to prevent the sealing ring from shifting, making the sealing effect more stable.

[0056] In addition, in the manufacturing method of the composite insulator of the present application, the sealing ring installation and the sealing treatment are simple to operate, the production efficiency is high, and the sealing performance of the produced composite insulator can be guaranteed.

[0057] The technical content and technical features of the present application have been disclosed above. However, it is understood that, under the creative concept of the present application, those skilled in the art can make various changes and improvements to the above structures and materials, including combinations of technical features disclosed or claimed separately herein, and obviously including other combinations of these features. These variations and / or combinations all fall within the technical field involved in the present application and fall within the protection scope of the claims of the present application.

Claims

1. A composite insulator, comprising a core rod, a sheath covering the outer periphery of the core rod, and a hardware fixedly sleeved on the end of the core rod, characterized in that: The hardware fitting is provided with a first cavity and a second cavity connected to each other near the end of the mandrel, the diameter of the second cavity is larger than the diameter of the first cavity, the end of the mandrel is fixed in the first cavity, and the end of the mandrel abuts against the bottom wall of the first cavity, a sealing ring is provided in the second cavity, and the sealing ring abuts against the bottom wall of the second cavity, the end face of the hardware fitting near the sheath is a curved surface, and the remaining part of the second cavity is filled with sealant, the sealant covers the curved surface and is connected to the sheath, so that the hardware fitting and the sheath are sealed.

2. The composite insulator according to claim 1, characterized in that: The sealing ring tightly abuts against the sheath and the side wall of the second cavity at the same time.

3. The composite insulator according to claim 1, characterized in that: The sealant is room temperature vulcanized silicone rubber.

4. The composite insulator according to claim 1, characterized in that: The sheath is in close contact with the bottom wall of the second cavity.

5. The composite insulator according to claim 1, characterized in that: At least one first sealing groove is circumferentially arranged on the end surface of the hardware close to the sheath to form the curved surface.

6. The composite insulator according to claim 5, characterized in that: The cross section of the first sealing groove is rectangular.

7. The composite insulator according to claim 1, characterized in that: A concave-convex sealing interface is provided on the side wall of the second cavity.

8. The composite insulator according to claim 1, characterized in that: A second sealing groove is disposed on the side wall of the second cavity, and the second sealing groove is clamped with the sealing ring.

9. The composite insulator according to claim 1, characterized in that: The edge of the end surface of the hardware is surrounded by a protrusion, and the end of the protrusion is an arc surface to form the curved surface.

10. The composite insulator according to claim 1, characterized in that: The end surface of the hardware close to the sheath and its outer peripheral surface are smoothly connected.

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