Composite insulator and composite cross arm

Abstract

The composite insulator comprises an insulator, a sheath wrapping the periphery of the insulator and flanges arranged at the two ends of the insulator in a sleeving mode, each flange comprises a flange cylinder and a flange plate, each flange cylinder comprises a first end and a second end which are oppositely arranged in the axial direction of the flange cylinder, and the flange plates seal the first ends of the flange cylinders; the end portion of the insulator is inserted into the inner wall of the flange cylinder from the second end of the flange cylinder and abuts against the flange plate. A connecting groove is formed in the second end of the flange cylinder and extends outwards in the radial direction of the flange cylinder on the inner wall of the flange cylinder, a first step face is formed between the connecting groove and the inner wall of the flange cylinder, and a sealing ring and a sealing structure are arranged in a cavity formed between the outer wall of the sheath and the peripheral wall of the connecting groove. And the sealing structure extends to cover the periphery of the flange and the periphery of the sheath. The utility model further discloses a composite cross arm comprising the composite insulator.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission insulation equipment, in particular to a composite insulator and a composite cross arm. BACKGROUND

[0002] In the operation process of the composite insulator in the existing composite cross arm, if the end sealing fails, external moisture and water will enter the inside of the composite insulator along the end sealing position, causing partial discharge and gradually developing into an arc connecting the high and low end flanges, resulting in non-self-recovery damage to the internal insulation of the composite insulator, and even causing explosion cracking and tripping of the composite insulator due to the rapid increase of internal pressure.

[0003] The sealing glue structure of the flange end of the existing composite insulator has the problems of short interface length and poor aging resistance. If the sealing glue is used in a high-humidity environment for a long time, especially in the plum rain season, there is a risk of external water entering along the sealing glue surface, the inner surface of the flange, and the inner wall of the composite insulator tube. Therefore, it is necessary to design a flange end sealing reinforcement structure for the existing composite insulator product. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, the purpose of the present application is to provide a composite insulator and a composite cross arm, which has good flange end sealing effect and avoids internal flashover accidents of the composite insulator due to long-term sealing failure.

[0005] To achieve the above-mentioned purpose, the technical means adopted by the present application is as follows: a composite insulator, comprising an insulator, a sheath wrapped around the outer periphery of the insulator, and a flange sleeved on both ends of the insulator, the flange comprising a flange cylinder and a flange disc, the flange cylinder comprising a first end and a second end arranged opposite along the axial direction, the flange disc covering the first end of the flange cylinder, and the end of the insulator being inserted into the inner wall of the flange cylinder from the second end of the flange cylinder and abutting against the flange disc; the second end of the flange cylinder is provided with a connecting groove, the connecting groove extends outward along the radial direction of the flange cylinder on the inner wall of the flange cylinder, a first step surface is formed between the connecting groove and the inner wall of the flange cylinder, a sealing ring and a sealing structure are arranged in the cavity formed between the outer wall of the sheath and the peripheral wall of the connecting groove, and the sealing structure extends to wrap around the outer periphery of the flange and the outer periphery of the sheath.

[0006] In an embodiment, the sealing structure is made of high-temperature vulcanized silicone rubber.

[0007] In an embodiment, the sheath is made of high-temperature vulcanized silicone rubber, and the outer peripheral surface of the sealing structure and the sheath is smoothly transitioned.

[0008] In an embodiment, the sealing ring is located between the outer wall of the sheath and the peripheral wall of the connecting groove.

[0009] In an embodiment, the sealing ring is located between the end of the sheath and the first step surface.

[0010] In an embodiment, the sealing ring comprises a first sealing ring located between the outer wall of the sheath and the peripheral wall of the connecting groove, and a second sealing ring located between the end surface of the sheath and the first step surface.

[0011] In an embodiment, in the axial direction of the composite insulator, the sealing structure extends to a distance of 7mm-12mm between the farthest position of the outer periphery of the flange and the second end of the flange barrel.

[0012] In an embodiment, in the axial direction of the composite insulator, the sealing structure extends to a distance of 12mm-15mm between the farthest position of the outer periphery of the sheath and the second end of the flange barrel.

[0013] In an embodiment, in the axial direction of the composite insulator, the sealing structure comprises a first sealing region, a second sealing region and a third sealing region, the first sealing region covers the outer periphery of the flange, the second sealing region covers the outer periphery of the sheath, and the third sealing region is filled between the outer wall of the sheath and the peripheral wall of the connecting groove.

[0014] In an embodiment, the first sealing region covers the outer periphery of the flange with a thickness of 3mm-5mm, and the second sealing region covers the outer periphery of the sheath with a thickness equal to the sum of the thickness of the first sealing region and the radial distance from the outer wall of the sheath to the outer wall of the flange.

[0015] To achieve the above-mentioned purpose, another technical means adopted by the present application is as follows: a composite cross arm comprising the composite insulator described above.

[0016] The beneficial effects of the present application are: Different from the prior art, the composite insulator of the present application sets a high-performance sealing structure on the end surface at the connection between the insulator and the flange, i.e. adopts the form of high-temperature vulcanized silicone rubber encapsulation, which on the one hand effectively prolongs the sealing length of the sealing structure between the flange and the sheath, increases the safety distance of preventing water vapor from entering the inner wall of the flange, and maximizes the sealing effect; on the other hand, it ensures the consistency of the sealing structure material and the sheath material, thereby effectively improving the interface sealing effect and aging resistance of the sealing structure. At the same time, it can also shorten the preparation time, improve the production efficiency, and improve the performance and quality of the finished product. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic diagram of a composite insulator 100 according to an embodiment of the present application;

[0018] Figure 2 is a partial schematic diagram of the sealing part of the flange 130 and the sheath 120 according to an embodiment of the present application;

[0019] Figure 3 is a partial view of the sealing position between the flange 130 and the sheath 120 according to another embodiment of the present application;

[0020] Figure 4 is a partial view of the sealing position between the flange 130 and the sheath 120 according to yet another embodiment of the present application. DETAILED DESCRIPTION

[0021] In accordance with the requirements, the specific embodiments of the present application will be disclosed here. However, it should be understood that the embodiments disclosed here are only typical examples of the present application, which can be embodied in various forms. Therefore, the specific details disclosed here are not considered to be limiting, but only as a representative basis for teaching those skilled in the art to apply the present application differently in any appropriate manner in practice, including the use of various features disclosed here and in combination with features that can not be explicitly disclosed here.

[0022] As Figure 1 shown, the present application provides a composite insulator 100, which comprises an insulator 110, a sheath 120 wrapped around the outer periphery of the insulator 110, and flanges 130 sleeved on both ends of the insulator 110, the sheath 120 has a plurality of sheds 140 extending radially therefrom, the plurality of sheds 140 are arranged at intervals along the axial direction of the composite insulator 100, the flange 130 comprises a flange barrel 131 and a flange plate 132, the flange barrel 131 comprises a first end 1311 and a second end 1312 arranged oppositely along the axial direction, the flange plate 132 covers the first end 1311 of the flange barrel 131, the end portion of the insulator 110 is inserted into the inner wall of the flange barrel 131 from the second end 1312 of the flange barrel 131 and abuts against the flange plate 1321, thereby making the flange 130 sleeved and fixed on the end portion of the insulator 110. Wherein, the flange 130 is provided in two, which are respectively sleeved and fixed on both ends of the insulator 110, for connecting the composite insulator 100 to other devices and equipment.

[0023] The insulator 110 can be a solid insulating core or a hollow insulating tube, wherein when the insulator 110 is a solid insulating core, it can be a solid core rod formed by winding or pultrusion of glass fiber or aramid fiber impregnated with epoxy resin, when the insulator 110 is a hollow insulating tube, it can be a hollow pultrusion tube formed by pultrusion and winding of glass fiber or aramid fiber impregnated with epoxy resin, it can also be a glass steel tube formed by winding and curing or pultrusion of glass fiber impregnated with epoxy resin, and it can also be an aramid fiber tube formed by winding and curing of aramid fiber impregnated with epoxy resin, which is not limited here. At the same time, the sheath 120 and the shed 140 are made of high temperature vulcanized silicone rubber.

[0024] In combination Figure 2As shown, in an embodiment, the flange 130 further comprises a first connecting groove 133 located at the second end 1312 of the flange barrel 131, the first connecting groove 133 extends along the radial direction of the flange barrel 131 on the inner wall of the flange barrel 131, the diameter of the first connecting groove 133 is greater than the diameter of the inner wall of the flange barrel 131 and less than the diameter of the outer wall of the flange barrel 131, and then a first step surface 134 is formed between the first connecting groove 133 and the inner wall of the flange barrel 131. When the insulator 110 is inserted into the inner wall of the flange barrel 131 and abuts against the flange plate 132, the end surface of the sheath 120 abuts against the first step surface 134, thereby ensuring the stable connection between the insulator 110 and the flange 130.

[0025] Continuing to refer to Figure 2 , the outer diameter of the sheath 120 is less than the diameter of the first connecting groove 133, so that a cavity is formed between the outer wall of the sheath 120 and the peripheral wall of the first connecting groove 133, and the first sealing ring 150 is arranged in the cavity, i.e., the first sealing ring 150 is located between the outer wall of the sheath 120 and the peripheral wall of the first connecting groove 133, and the first sealing ring 150 simultaneously abuts against the outer wall of the sheath 120, the peripheral wall of the first connecting groove 133 and the first step surface 134, thereby fully sealing the sheath 120 and the flange 130 and preventing external contaminants, water vapor and the like from entering the flange 130. In other embodiments, the first sealing ring can also be arranged between the end surface of the sheath and the first step surface, which is not limited herein.

[0026] Meanwhile, the remaining part of the cavity between the outer wall of the sheath 120 and the peripheral wall of the first connecting groove 133 after the first sealing ring 150 is arranged in the cavity is covered with a sealing structure 160, and the sealing structure 160 extends and covers the outer periphery of the flange 130 and the outer periphery of the sheath 120. In the axial direction of the composite insulator 100, the sealing structure 160 comprises a first sealing region 161, a second sealing region 162 and a third sealing region, the first sealing region 161 covers the outer periphery of the flange 130, the second sealing region 162 covers the outer periphery of the sheath 120, and the third sealing region is filled between the outer wall of the sheath 120 and the peripheral wall of the first connecting groove 133. Among them, in the radial direction of the composite insulator 100, the thickness of the first sealing region 161 covering the outer periphery of the flange 130 is 3mm-5mm; the thickness of the second sealing region 162 covering the outer periphery of the sheath 120 is equal to the sum of the thickness of the first sealing region 161 and the radial distance from the outer wall of the sheath 120 to the outer wall of the flange 130, so that the outer peripheral surfaces of the first sealing region 161 and the second sealing region 162 coincide, and the first sealing region 161 and the second sealing region 162 are both circular rings, so that the thickness of the sealing structure 160 is uniform, thereby ensuring the overall mechanical strength of the sealing structure 160; the thickness of the third sealing region is equal to the radial distance between the outer wall of the sheath 120 and the peripheral wall of the first connecting groove 133.

[0027] Further, in the axial direction of the composite insulator 100, the distance L1 between the farthest position of the outer periphery of the flange 130 and the second end 1312 of the flange cylinder 131 is the length of the first sealing area 161, and the range of L1 is 7mm-12mm; the distance L2 between the farthest position of the outer periphery of the sheath 120 and the second end 1312 of the flange cylinder 131 is the length of the second sealing area 162, and the range of L2 is 12mm-15mm. In this way, the interface sealing length between the flange 130 and the sheath 120 is long, which improves the safety distance of preventing water vapor from entering the inner wall of the flange 130, maximizes the sealing effect, and prevents the sealing structure 160 from aging after long-term operation, resulting in sealing failure. The sealing structure 160 in the embodiment is suitable for the process of vertical gluing of the insulator 110 and the flange 130. During the vertical gluing process, the glue injection situation can be observed from the top.

[0028] In the sealing structure 160, high-temperature vulcanized silicone rubber is used. After the flange 130 is sleeved on the end of the insulator 110, an injection mold is sleeved on the outer periphery of the connection between the flange 130 and the sheath 120. The injection mold is filled with silicone rubber compound. After heating and pressurizing for a certain period of time, the silicone rubber compound in the injection mold is vulcanized to form the sealing structure 160 of high-temperature vulcanized silicone rubber. The injection-molded sealing structure 160 is trimmed to make the sealing structure 160 and the outer periphery of the sheath 120 smoothly transition.

[0029] The connection between the flange and the sheath in the prior art uses room-temperature vulcanized silicone rubber for sealing. However, room-temperature vulcanized silicone rubber is far inferior to high-temperature vulcanized silicone rubber in terms of aging resistance, especially in long-term high-temperature and high-humidity conditions, which can easily lead to sealing failure, resulting in the intrusion of external water vapor and accelerating the corrosion and aging of the composite insulator. Therefore, the sealing structure 160 made of high-temperature vulcanized silicone rubber can further strengthen the sealing between the flange 130 and the sheath 120. Compared with the traditional manual operation method for room-temperature vulcanized silicone rubber sealing, the present application can effectively avoid the performance differences of the composite insulator 100 caused by different personnel operation levels. At the same time, after the room-temperature vulcanized silicone rubber is coated on the connection between the sheath and the flange, it needs to be left at room temperature for 8-12 hours to completely cure. However, high-temperature vulcanized silicone rubber only needs to be heated and pressurized for about 2 hours to cure. Therefore, the sealing structure 160 made of high-temperature vulcanized silicone rubber can also shorten the preparation time, thereby improving the production efficiency. Since the sheath 120 also uses high-temperature vulcanized silicone rubber, the material of the sealing structure 160 is consistent with that of the sheath 120, which further ensures the excellent interface sealing effect and aging resistance between the flange 130 and the sheath 120, and greatly improves the insulation life of the composite insulator 100.

[0030] In combinationFigure 3 As shown, in another embodiment, the flange barrel 131 is further provided with a second connecting groove 135 extending along the radial direction of the flange barrel 131 on the inner wall of the flange barrel 131, and the second connecting groove 135 is arranged adjacent to the first connecting groove 133 on the side away from the second end 1312 of the flange barrel 131. The diameter of the second connecting groove 135 is greater than that of the inner wall of the flange barrel 131 and less than that of the first connecting groove 133, and then a first step surface 134 is formed between the second connecting groove 135 and the inner wall of the flange barrel 131, and a second step surface 136 is formed between the second connecting groove 135 and the first connecting groove 133.

[0031] The outer diameter of the sheath 120 is slightly smaller than the diameter of the second connecting groove 135, and the sheath 120 is directly inserted into the second connecting groove 135. A second sealing ring 170 is arranged between the end face of the sheath 120 and the first step surface 134. When the insulator 110 is inserted into the inner wall of the flange barrel 131 and abuts against the flange plate 132, the end face of the sheath 120 directly presses the second sealing ring 170, so that the second sealing ring 170 is fully compressed. At this time, the second sealing ring 170 simultaneously abuts against the end face of the sheath 120, the peripheral wall of the second connecting groove 135, the outer wall of the insulator 110 and the first step surface 134, so as to fully seal the sheath 120 and the flange 130, and prevent external dirt, water vapor and the like from entering the flange 130. At the same time, the cavity formed between the outer wall of the sheath 120 and the peripheral wall of the first connecting groove 133 is also covered with a sealing structure 160, and the sealing structure 160 extends and covers the outer periphery of the flange 130 and the outer periphery of the sheath 120. The material, structure and size of the sealing structure 160 are consistent with the foregoing, and will not be described again.

[0032] In this embodiment, the second sealing ring 170 is arranged between the first step surface 134 and the end face of the sheath 120, which can fully extrude the second sealing ring 170 during the assembly of the insulator 110 and the flange 130, so as to fully compress the second sealing ring 170 and then fully seal the sheath 120 and the flange 130. At the same time, this mode is suitable for the process of using horizontal glue assembly for the insulator 110 and the flange 130, so as to avoid the overflow of glue between the contact surfaces of the insulator 110 and the flange 130. Otherwise, the overflowed glue will fill into the cavity between the flange 130 and the sheath 120, so as to cause the sealing structure 160 to be unable to firmly cover.

[0033] In combination with Figure 4As shown, in still another embodiment, the inner wall of the flange sleeve 131 is provided with a first connecting groove 133 and a second connecting groove 135, and a sealing ring is arranged between the sheath 120 and the flange 130, which includes a first sealing ring 150 and a second sealing ring 170, the first sealing ring 150 is located between the outer wall of the sheath 120 and the peripheral wall of the first connecting groove 133, and the second sealing ring 170 is located between the end face of the sheath 120 and the first step face 134, thereby two sealing lines are arranged between the sheath 120 and the flange 130, which better plays a sealing role, and is also suitable for the process of horizontally gluing the insulator 110 and the flange 130, which is consistent with the foregoing and will not be repeated.

[0034] The application also provides a composite cross arm, which comprises the composite insulator 100 described above, one end of the composite insulator 100 is connected to the tower body of the power transmission tower, and the other end is used for hanging the conductor.

[0035] The application has the following beneficial effects: Different from the prior art, the composite insulator of the application sets a high-performance sealing structure on the end face of the connecting part between the insulator and the flange, that is, adopts the form of high-temperature vulcanized silicone rubber encapsulation, which on the one hand effectively prolongs the sealing length of the sealing structure between the flange and the sheath, improves the safety distance of preventing water vapor from entering the inner wall of the flange, and maximizes the sealing effect, and on the other hand ensures the consistency of the sealing structure material and the sheath material, thereby effectively improving the interface sealing effect and aging resistance of the sealing structure. At the same time, it can also shorten the preparation time, improve the production efficiency, and improve the performance and quality of the finished product.

[0036] The technical content and technical features of the application have been disclosed above, however, it can be understood that under the creative idea of the application, those skilled in the art can make various changes and improvements to the above structure and material, including the combination of technical features disclosed or claimed herein, obviously including other combinations of these features. These modifications and / or combinations all fall within the technical field involved by the application and fall within the protection scope of the claims of the application.

Claims

1. A composite insulator, characterized by, The composite insulator comprises an insulator, a sheath covering the outer periphery of the insulator, and flanges sleeved on both ends of the insulator, the flanges comprising a flange barrel and a flange plate, the flange barrel comprising a first end and a second end oppositely arranged along the axial direction of the flange barrel, the flange plate covering the first end of the flange barrel, the end of the insulator being inserted into the inner wall of the flange barrel from the second end of the flange barrel and abutting against the flange plate; the second end of the flange barrel is provided with a connecting groove extending outward along the radial direction of the flange barrel on the inner wall of the flange barrel, a first step surface being formed between the connecting groove and the inner wall of the flange barrel, a cavity being formed between the outer wall of the sheath and the peripheral wall of the connecting groove, a sealing ring and a sealing structure being arranged in the cavity, and the sealing structure extending to cover the outer periphery of the flange and the outer periphery of the sheath.

2. The composite insulator of claim 1, wherein The sealing structure is made of high-temperature vulcanized silicone rubber.

3. The composite insulator of claim 2, wherein The sheath is made of high-temperature vulcanized silicone rubber, and the outer peripheral surface of the sealing structure and the outer peripheral surface of the sheath are smoothly connected.

4. The composite insulator of claim 1, wherein The sealing ring is located between the outer wall of the sheath and the peripheral wall of the connecting groove.

5. The composite insulator of claim 1, wherein The sealing ring is located between the end surface of the sheath and the first step surface.

6. The composite insulator of claim 1, wherein The sealing ring comprises a first sealing ring and a second sealing ring, the first sealing ring being located between the outer wall of the sheath and the peripheral wall of the connecting groove, and the second sealing ring being located between the end surface of the sheath and the first step surface.

7. The composite insulator of claim 1, wherein In the axial direction of the composite insulator, the distance between the farthest position of the extension of the sealing structure to the outer periphery of the flange and the second end of the flange barrel is 7-12 mm.

8. The composite insulator of claim 1, wherein In the axial direction of the composite insulator, the distance between the farthest position of the extension of the sealing structure to the outer periphery of the sheath and the second end of the flange barrel is 12-15 mm.

9. The composite insulator of claim 1, wherein In the axial direction of the composite insulator, the sealing structure comprises a first sealing region, a second sealing region, and a third sealing region, the first sealing region covering the outer periphery of the flange, the second sealing region covering the outer periphery of the sheath, and the third sealing region being filled between the outer wall of the sheath and the peripheral wall of the connecting groove.

10. The composite insulator of claim 9, wherein The thickness of the first sealing region covering the outer periphery of the flange is 3-5 mm, and the thickness of the second sealing region covering the outer periphery of the sheath is equal to the sum of the thickness of the first sealing region and the radial distance from the outer wall of the sheath to the outer wall of the flange.

11. A composite cross arm, characterized by, The composite insulator as claimed in any one of claims 1-10.

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