CN114582572B - Composite insulator - Google Patents
Composite insulator Download PDFInfo
- Publication number
- CN114582572B CN114582572B CN202210187817.9A CN202210187817A CN114582572B CN 114582572 B CN114582572 B CN 114582572B CN 202210187817 A CN202210187817 A CN 202210187817A CN 114582572 B CN114582572 B CN 114582572B
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- insulator
- groove
- flange
- adhesive
- glue
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- 239000012212 insulator Substances 0.000 title claims abstract description 189
- 239000002131 composite material Substances 0.000 title claims abstract description 72
- 239000000853 adhesive Substances 0.000 claims abstract description 91
- 230000001070 adhesive effect Effects 0.000 claims abstract description 71
- 239000003292 glue Substances 0.000 claims description 78
- 238000007789 sealing Methods 0.000 claims description 36
- 229920000715 Mucilage Polymers 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 13
- 238000005253 cladding Methods 0.000 claims description 2
- 238000010008 shearing Methods 0.000 abstract description 25
- 230000008569 process Effects 0.000 description 11
- 239000007789 gas Substances 0.000 description 10
- 238000012545 processing Methods 0.000 description 9
- 238000005452 bending Methods 0.000 description 7
- 238000009413 insulation Methods 0.000 description 7
- 238000004026 adhesive bonding Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 229920002379 silicone rubber Polymers 0.000 description 5
- 239000003822 epoxy resin Substances 0.000 description 4
- 229920000647 polyepoxide Polymers 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000012790 adhesive layer Substances 0.000 description 3
- 229920006231 aramid fiber Polymers 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 239000004945 silicone rubber Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 239000004944 Liquid Silicone Rubber Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 229910018503 SF6 Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000009422 external insulation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 238000005246 galvanizing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- UFMBFIIJKCBBHN-MEKJRKEKSA-N myelin peptide amide-16 Chemical compound C([C@@H](C(=O)N[C@@H](CC(C)C)C(=O)N[C@@H](C)C(=O)N[C@@H](CO)C(=O)N[C@@H](C)C(N)=O)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CO)NC(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](CO)NC(=O)[C@H]1N(CCC1)C(=O)[C@H](CCCNC(N)=N)NC(=O)[C@H](CCCCN)NC(=O)[C@H](CCC(N)=O)NC(=O)[C@H](C)NC(=O)[C@H](C)NC(C)=O)C1=CC=C(O)C=C1 UFMBFIIJKCBBHN-MEKJRKEKSA-N 0.000 description 1
- 108010074682 myelin peptide amide-16 Proteins 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000013464 silicone adhesive Substances 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/38—Fittings, e.g. caps; Fastenings therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B17/00—Insulators or insulating bodies characterised by their form
- H01B17/56—Insulating bodies
- H01B17/60—Composite insulating bodies
Landscapes
- Insulators (AREA)
Abstract
The application discloses a composite insulator, which comprises an insulator, umbrella skirts and flanges, wherein the umbrella skirts are fixedly coated and fixed on the periphery of the insulator, the flanges are fixedly connected with the end parts of the insulator, the flanges comprise flange cylinders, the flange cylinders are arranged to be hollow structures along the axial direction of the composite insulator and sleeved at the end parts of the insulator, a plurality of first adhesive binding grooves are arranged on the inner wall of each flange cylinder at intervals along the axial direction to be filled with adhesive, the interval between every two adjacent first adhesive binding grooves is a first bulge, the widths of the first adhesive binding grooves are equal, and the ratio of the widths of the first adhesive binding grooves to the widths of the first bulges is equal to the ratio of the shearing strength of the insulator to the shearing strength of the adhesive. The ratio of the width of the first adhesive groove to the width of the first bulge on the inner wall of the flange cylinder is equal to the ratio of the shearing strength of the insulator to the shearing strength of the adhesive.
Description
Technical Field
The application relates to the technical field of power transmission and transformation insulating equipment, in particular to a composite insulator.
Background
At present, the composite insulator is widely applied to the technical field of power transmission and transformation insulating equipment. However, the glue binding structure of the existing composite insulator is generally as follows: a plurality of one-to-one glue grooves are formed between the flange and the insulator, glue is injected into the glue grooves for fixation, when the glue structure bears bending load, peeling stress is easily generated at the interface between the insulator and the adhesive at the opening of the tension side of the flange, inside the adhesive and the interface between the adhesive and the flange, namely, the glue has an opening trend, meanwhile, the bulge of the adhesive, the bulge of the flange cylinder and the bulge of the insulator are easily subjected to shearing stress, and the pipe performance and the adhesive performance cannot be designed in a balanced mode.
Disclosure of Invention
Aiming at the defects of the prior art, the application aims to provide the composite insulator, which balances the performance of a pipe body and the performance of an adhesive, improves the mechanical performance and reduces the production cost.
In order to solve the technical problems, the application adopts the following technical scheme: the utility model provides a composite insulator, including the insulator, cladding is fixed in the umbrella skirt of insulator periphery, with insulator end connection's flange, the flange includes a flange section of thick bamboo, the flange section of thick bamboo sets up to hollow structure along the axial of composite insulator, the cover is established in the tip of insulator, wherein the inner wall of a flange section of thick bamboo is equipped with a plurality of first mucilage binding grooves that set up along axial interval in order to pack the gluing agent, the interval between two adjacent first mucilage binding grooves is first arch, the width of a plurality of first mucilage binding grooves equals, and the ratio of the width of first mucilage binding groove and the width of first arch equals the ratio of the shearing strength of insulator and the shearing strength of gluing agent; the end outside of insulator is equipped with a plurality of second mucilage binding grooves that set up along axial interval, and the interval between two adjacent second mucilage binding grooves is the second arch, and the second mucilage binding groove is the same just to setting with first mucilage binding groove specification, and the second arch just sets up with first protruding specification the same.
The ratio of the width of the first adhesive groove to the width of the first bulge is equal to the ratio of the shearing strength of the insulator to the shearing strength of the adhesive, so that the bending strength and the shearing resistance of the composite insulator can be improved.
Wherein the cross section of the first protrusion is rectangular. The rectangular bulge and the rectangular groove can ensure even stress and are not easy to generate stress concentration.
Wherein the sum of the width of the first glue groove and the width of the first bulge is 16mm-32mm. The width is too narrow and difficult to process, and the adhesive layer with too long width is easy to generate oblique fracture, so that the shearing resistance of the composite insulator is poor.
Wherein, the ratio of the length of the insulator sleeved on the inner wall part of the flange cylinder to the outer diameter of the insulator is 0.4-1.2. The strength of the composite insulator can be ensured, and the processing time and the processing cost of the composite insulator can be ensured to be within a reasonable range.
Wherein, in the radial direction of the composite insulator, the distance between the outer wall of the insulator and the inner wall of the flange cylinder is 0.25mm-0.75mm. The distance between the outer wall of the insulator and the inner wall of the flange cylinder is too short, the bonding strength of the flange and the insulator is insufficient, the distance is too long, and the strength of the composite insulator is insufficient.
Preferably, the insulator is a hollow insulating tube, insulating gas is sealed in the insulator, and the absolute pressure value of the insulating gas ranges from 0.1Mpa to 0.15Mpa.
The inner wall of the flange cylinder is further provided with a circulation groove communicated with the plurality of first glue grooves, and the first glue grooves, the second glue grooves, the circulation groove and gaps between the outer wall of the insulator and the inner wall of the flange cylinder are filled with adhesive. The circulation groove is communicated with the first glue groove, so that the glue injection speed can be increased, and the torsion resistance of the composite insulator can be improved on the premise that the adhesive with better adhesive property is not replaced.
Wherein the bottom surface of the circulation groove is a plane or a curved surface. When the bottom surface of the circulation groove is set to be a plane, the torsion resistance of the composite insulator can be improved.
The flange also comprises a flange plate, and one end of the flange cylinder far away from the insulator is covered; the surface of the flange, facing the insulator, is provided with a first sealing groove facing the end face of the insulator, and a first sealing piece is arranged in the first sealing groove; and the inner wall of the flange cylinder is provided with a second sealing groove adjacent to the flange plate, the second sealing groove and the plurality of first adhesive binding grooves are sequentially arranged at intervals along the direction away from the flange plate, and a second sealing piece is arranged in the second sealing groove. The end, far away from the insulator, of the flange disc sealing cover flange cylinder is arranged, so that corrosion of external water vapor and the like to the insulator can be avoided, the insulator is protected, and the service life of the composite insulator is prolonged; the second seal groove and the second seal piece can avoid that the adhesive in the gluing process enters the first seal groove to corrode the first seal piece and cause the failure of the first seal piece.
Wherein the width of the first seal groove and/or the second seal groove is kept unchanged or gradually becomes smaller in a direction approaching the insulator. The width of the first sealing groove and/or the second sealing groove gradually becomes smaller in the direction close to the insulator, so that the first sealing piece and/or the second sealing piece can be prevented from falling off in the installation process.
The beneficial effects of the application are as follows: the ratio of the width of the first adhesive groove to the width of the first bulge on the inner wall of the flange barrel in the flange is equal to the ratio of the shearing strength of the insulator to the shearing strength of the adhesive.
Meanwhile, the circulation grooves communicated with the two adjacent first glue grooves are formed in the inner wall of the flange barrel, so that the glue injection rate can be improved, the bubble retention risk is reduced, the combination of the flange and the insulator is firmer, and the anti-torsion performance of the composite insulator can be improved on the premise that the adhesive with better adhesive performance is not replaced.
In addition, the second sealing groove and the second sealing piece are arranged on the inner wall of the flange cylinder, so that the first sealing piece is prevented from being invalid due to the fact that adhesive in the gluing process enters the first sealing groove to corrode the first sealing piece.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a schematic structural view of a composite insulator 100;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a schematic cross-sectional view of flange 130;
FIG. 4 is an enlarged schematic view at A in FIG. 3;
FIG. 5 is an enlarged schematic view at B in FIG. 2;
FIG. 6 is an enlarged schematic view of FIG. 2 at C in an application scenario;
FIG. 7 is an enlarged schematic view of FIG. 2 at C in another application scenario;
fig. 8 is an enlarged schematic view at D in fig. 5.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In an embodiment, referring to fig. 1 to 5, the composite insulator 100 includes an insulator 110, a shed 120 wrapped and fixed on the periphery of the insulator 110, and a flange 130 connected to an end of the insulator 110, where the flange 130 includes a flange cylinder 131, and the flange cylinder 131 is arranged in a hollow structure along an axial direction of the composite insulator 100 and sleeved on the end of the insulator 110, and the axial direction of the flange cylinder 131, the axial direction of the insulator 110, and the axial direction of the composite insulator 100 are in the same direction. The inner wall of the flange cylinder 131 is provided with a plurality of first glue grooves 1311 which are arranged at intervals along the axial direction of the composite insulator 100 so as to be filled with adhesive, the interval between two adjacent first glue grooves 1311 is a first protrusion 1312, the length of the first glue grooves 1311 along the axial direction of the flange cylinder 131 is defined as the width of the first glue grooves 1311, the length of the first protrusion 1312 along the axial direction of the flange cylinder 131 is defined as the width of the first protrusion 1312, the widths of the plurality of first glue grooves 1311 are equal, and the ratio of the width of the first glue grooves 1311 to the width of the first protrusion 1312 is equal to the ratio of the shear strength of the insulator 110 to the shear strength of the adhesive. The outer side of the end part of the insulator 110 is provided with a plurality of second glue grooves 111 which are arranged along the axial direction of the composite insulator 100 at intervals, the interval between two adjacent second glue grooves 111 is a second bulge 112, the second glue grooves 111 and the first glue grooves 1311 are identical in specification and are opposite to each other, and the second bulge 112 and the first bulge 1312 are identical in specification and are opposite to each other. The ratio of the width of the first glue groove 1311 to the width of the first protrusion 1312 on the inner wall of the flange cylinder 131 is equal to the ratio of the shear strength of the insulator 110 to the shear strength of the adhesive, and compared with the first glue groove 1311 and the first protrusion 1312 with the widths set according to other ratios, the setting can ensure the strength and the shear resistance of the composite insulator 100.
The composite insulator 100 may be a hollow insulator, or may be a post insulator, that is, the insulator 110 may be a solid insulating core, or may be a hollow insulating tube, where when the insulator 110 is a solid insulating core, it may be a solid core rod formed by winding glass fiber or aramid fiber impregnated epoxy resin, or formed by pultrusion, and when the insulator 110 is a hollow insulating tube, it may be a hollow pultrusion tube formed by winding glass fiber or aramid fiber impregnated epoxy resin, or may be a glass fiber reinforced plastic tube formed by winding glass fiber impregnated epoxy resin, or an aromatic fiber tube formed by winding aramid fiber impregnated epoxy resin, or formed by pultrusion, which is not limited herein.
The insulator 110 may be cylindrical as shown in fig. 1, conical or other shape (e.g., drum-shaped), without limitation.
In an application scenario, when the insulator 110 is a hollow insulating tube, the insulator 110 is sealed with an insulating gas, and the absolute pressure of the insulating gas ranges from 0.1Mpa to 0.15Mpa, for example, 0.1Mpa, 0.12Mpa, or 0.15Mpa.
The gas sealed in the hollow insulating tube can be high-purity nitrogen gas, air or sulfur hexafluoride gas subjected to drying treatment, and the like, and the gas is not limited herein.
The absolute pressure value range of the insulating gas sealed in the insulator 110 is set to be 0.1-0.15 Mpa, so that the insulating gas is not easy to leak from the hollow insulating tube, daily maintenance and monitoring of the composite insulator 100 are avoided, and different pressure use requirements between different regions and altitudes can be met, so that the hollow insulating tube is ensured to be in a non-negative pressure state when being used in different regions, and meanwhile, the hollow insulating tube can be provided with a larger micro-water control margin, and the difficulty of micro-water control is effectively reduced.
In other applications, when the insulator 110 is a hollow insulating tube, the inside of the insulating tube may be sealed with an inert gas or a solid material such as polyurethane, liquid silicone rubber, etc., which is not limited herein.
Referring to fig. 1 and 2, in the present embodiment, the composite insulator 100 is horizontally used, that is, the composite insulator 100 is axially horizontally disposed, and the umbrella skirt 120 includes a plurality of umbrella bodies 121 disposed at intervals and identical, that is, all the umbrella bodies 121 are identical, each umbrella body 121 completely surrounds the outer circumference of the insulator 110, and the umbrella bodies 121 are axially symmetrical with respect to the insulator 110. Meanwhile, the umbrella body 121 comprises two surfaces which are oppositely arranged, and the two surfaces which are oppositely arranged have opposite inclination directions and the same inclination angle, namely, the umbrella body 121 is also symmetrical relative to the radial direction of the insulator 110. The umbrella body 121 is arranged to be radially symmetrical relative to the insulator 110, on one hand, compared with the prior art, two surfaces of the umbrella body, which are arranged on the back of the umbrella body, are inclined towards the same direction, so that rainwater can flow down along the umbrella body (if the two surfaces of the umbrella body, which are arranged on the back of the umbrella body, are inclined towards the same direction, rainwater is easy to accumulate in an included angle between the composite insulator and the umbrella body), thereby a water film is not formed on the surface of the umbrella skirt 120, self-cleaning of the umbrella skirt 120 is facilitated, and on the other hand, two sides of the umbrella skirt 120, which are arranged on the back of the umbrella body, have the same mechanical properties, so that the composite insulator 100 has the characteristics of pollution resistance, rain flash resistance, ice flash resistance, economy and the like.
In an application scenario, in order to avoid bridging caused by turbulence and dirt accumulation between two adjacent umbrella bodies 121, the distance between two adjacent umbrella bodies 121 is greater than 40mm and not more than 60mm, for example, the distance is 45mm, 50mm or 60mm. Of course, the distance between two adjacent umbrella bodies 121 should be reduced as much as possible, so that the distribution density of the umbrella bodies 121 can be increased, and birds are not convenient to stand on the umbrella skirt, thereby preventing bird damage accidents. Meanwhile, under the requirement of ensuring the minimum creepage distance, the height of the side, protruding from the insulator 110, of the umbrella body 121 is not more than 80mm, and is generally set to be 50 mm-80 mm, for example, 50mm, 60mm, 70mm or 80 mm.
In other embodiments, the umbrella skirt may have other structures, for example, two adjacent umbrella bodies have different sizes, or two surfaces of the umbrella bodies disposed on the back of the umbrella bodies incline in the same direction, and in summary, the specific structure of the umbrella skirt is not limited.
In this embodiment, the umbrella skirt 120 is made of a high-temperature vulcanized silicone rubber material, and is fixed on the outer periphery of the insulator 110 by integral vacuum injection molding, so that the high-temperature vulcanized silicone rubber integral injection molding can ensure no bubble in the umbrella skirt 120, ensure the reliability of interface bonding, and integrally improve the external insulation performance and the service life of the composite insulator 100. Of course, in other embodiments, the umbrella skirt may be made of other rubber materials or insulating materials, such as liquid silicone rubber or room temperature vulcanized silicone rubber, or may be fixed around the core rod by molding or other processes, or the sheath and the umbrella skirt may be made separately and combined together by an adhesive.
With continued reference to fig. 1, the composite insulator 100 further includes flanges 130, and the flanges 130 are connected to two ends of the composite insulator 100 respectively to implement the installation of the composite insulator 100, and in this embodiment, the flanges include a flange barrel 131 and a flange plate 132. In other embodiments, flanges of different structures may be replaced to connect with different devices according to the applicable scenarios of the composite insulator, for example, a plate-type flat welding flange is used on the hollow insulator, and when the composite insulator 100 is a post insulator and is used as a composite cross arm, a flange with a connecting plate or the like is used in order to enable the composite insulator to be installed and applied in different scenarios, which is not limited herein. It should be noted that, the connection between the flange 130 and the insulator 110 is universal regardless of the type of flange.
In the present embodiment, the flange cylinder 131 is provided in a hollow structure along the axial direction of the composite insulator 100 and is sleeved on the end of the insulator 110; the flange 132 covers an end of the flange cylinder 131 away from the insulator 110, wherein the flange cylinder 131 and the flange 132 may be integrally formed, or may be separately formed and then connected together by welding or the like.
Specifically, the flange 132 is arranged to cover one end of the flange barrel 131 far away from the insulator 110, so that corrosion of external water vapor and the like to the insulator 110 can be avoided, the insulator 110 is protected, and the service life of the composite insulator 100 is prolonged.
In order to avoid the flange 130 from being corroded by moisture, etc., the surface of the flange 130 is treated by hot galvanizing, and meanwhile, the internal material of the flange 130 may be cast aluminum, cast iron or alloy steel, etc., which is not limited herein.
As shown in fig. 1 and 3, in the present embodiment, the inner wall of the flange cylinder 131 is further provided with a circulation groove 1313 communicating with a plurality of first glue grooves 1311, and the glue fills the first glue grooves 1311, the second glue grooves 111, the circulation groove 1313, and the gap between the outer wall of the insulator 110 and the inner wall of the flange cylinder 131, thereby fixedly connecting the flange cylinder 131 and the insulator 110.
In the production process, the flange 130 and the insulator 110 are connected together by adopting a horizontal cementing process or a vertical cementing process, and the specific steps are as follows: the adhesive is injected between the flange cylinder 131 and the insulator 110 through the glue injection holes on the flange cylinder 131, then the flange cylinder 131 is heated through the heating equipment, and after a certain time, the adhesive is cured at a high temperature so that the flange 130 and the insulator 110 are fixedly connected together.
The arrangement of the circulation groove 1313 can enable the adhesive between the injection flange barrel 131 and the insulator 110 to circulate between the adjacent first adhesive grooves 1311, so that the adhesive injection rate can be improved, the bubble retention risk is reduced, the combination of the flange 130 and the insulator 110 is firmer, and the anti-torsion performance of the composite insulator 100 can be improved on the premise that the adhesive with better adhesive performance is not replaced.
The number of the circulation grooves 1313 may be one or plural (for example, two, four, six or more), and when the number of the circulation grooves 1313 is plural, the plurality of the circulation grooves 1313 are arranged at intervals in the circumferential direction of the flange cylinder 131. One circulation groove 1313 may be only connected to two adjacent first glue grooves 1311, or may be connected to three, four or even all first glue grooves 1311 adjacent to each other, which is not limited herein.
The bottom surface of the flow channel 1313 is flat or curved. Specifically, when the radial depth and width of the circulation groove 1313 relative to the flange cylinder 131 are constant, the circulation groove 1313 having a planar bottom surface is complicated to process and has a higher processing cost than the circulation groove 1313 having a curved bottom surface, but has a higher torsional strength because the contact area between the adhesive in the planar groove and the inner wall of the flange cylinder 131 is larger, that is, the circulation groove 1313 having a curved bottom surface has a lower processing cost than the circulation groove 1313 having a planar bottom surface, but has a slightly lower torsional strength.
As shown in fig. 5 and 8, after the bending force is applied to the composite insulator 100, the shearing force applied to each of the second protrusions 112 of the insulator 110 and the shearing force applied to the adhesive filled in each of the first and second adhesive grooves 1311 and 111 are appliedThe forces being an interaction force of equal magnitude and opposite direction, i.e. F Insulation body ＝F Adhesive agent 。
According to f=ts (τ: shear strength, S: force area);
then τ Insulation body S Insulation body ＝τ Adhesive agent S Adhesive agent ；
Because s=wl (W: width of the stress surface, L: circumference of the stress surface), and the stress surface of the insulator 110 is a section of the second protrusion 112 along the axial direction of the insulator 110, the stress surface of the adhesive is a section of the first adhesive groove 1311 or the second adhesive groove 111 along the axial direction of the insulator 110;
namely S Insulation body ＝W Second protrusion L Second protrusion ，S Adhesive agent ＝W Second glue groove L Second glue groove ；
Then τ Insulation body W Second protrusion L Second protrusion ＝τ Adhesive agent W Second glue groove L Second glue groove ；
Due to L Second protrusion ＝L Second glue groove Outer surface perimeter of insulator 110;
can be given τ Insulation body /τ Adhesive agent ＝W Second glue groove /W Second protrusion I.e. the ratio of the width of the second glue groove 111 to the width of the second protrusion 112 is equal to the ratio of the shear strength of the insulator 110 to the shear strength of the adhesive.
And because the second glue groove 111 and the first glue groove 1311 have the same specification and are arranged opposite to each other, the second protrusion 112 and the first protrusion 1312 have the same specification and are arranged opposite to each other.
So that τ can be obtained by the same way Insulation body /τ Adhesive agent ＝W Second glue groove /W Second protrusion ＝W First mucilage binding groove /W First protrusion I.e., the ratio of the width of the first glue groove 1311 to the width of the first protrusion 1312 is equal to the ratio of the shear strength of the insulator 110 to the shear strength of the adhesive.
For ease of processing, the bottom surface of the first glue tank 1311 is curved.
The cross section of the first boss 1312 along the axial direction of the flange cylinder 131 is a cross section of the first boss 1312, and the cross section of the first boss 1312 is rectangular. On the premise that the cross section of the first protrusion 1312 is rectangular, the first glue groove 1311 is a rectangular groove, and the rectangular protrusion and the rectangular groove can ensure uniform stress and are not easy to generate stress concentration.
In some embodiments, the sum of the width of the first glue slot 1311 and the width of the first projection 1312 is 16mm-32mm. For ease of illustration, the sum of the width of the first glue slot 1311 and the width of the first projection 1312 is defined as a set of slot widths. When the width of the group of grooves is smaller than 16mm, the widths of the first adhesive binding groove 1311 and the second adhesive binding groove 111 are too small, and the processing difficulty of the first adhesive binding groove 1311 and the second adhesive binding groove 111 is high; and too small a width of the first and second protrusions 1312 and 112 may result in too small a strength of the first and second protrusions 1312 and 112 to be easily broken. When the width of the groove is greater than 32mm, the widths of the first adhesive groove 1311 and the second adhesive groove 111 are too large, and the adhesive filled between the first adhesive groove 1311 and the second adhesive groove 111 is easy to be broken obliquely after being stressed, namely, the adhesive is not broken along the axial direction of the flange barrel 131 when being broken, the breaking path is shortened, and the composite insulator 100 is easy to break, so that the shearing capacity of the composite insulator 100 is poor. Therefore, the width of the groove width of the set is not more than 32mm, for example, 32mm,24mm or 16mm, so that the strength of the composite insulator 100 can be ensured, and the processing time and the processing cost can be ensured to be within reasonable ranges.
The insulator 110 is fitted around the inner wall portion of the flange cylinder 131 and the ratio of the length in the axial direction of the insulator 110 to the outer diameter of the insulator 110 (i.e., the glue ratio) is in the range of 0.4 to 1.2, for example, 0.4, 1.0 or 1.2. Specifically, as the glue ratio decreases, the strength of the composite insulator 100 may decrease significantly, for example, when the glue ratio decreases to 0.35, the strength of the composite insulator 100 decreases by 20%, whereas when the glue ratio increases to 1.4, the strength of the composite insulator 100 increases slightly, but the cost increases significantly, so setting the glue ratio range to 0.4-1.2 may enable the composite insulator 100 to have advantages of low cost, high strength, and the like.
The distance between the outer wall of the insulator 110 and the inner wall of the flange cylinder 131 (i.e., the glue gap) is 0.25mm to 0.75mm in the radial direction of the composite insulator 100. When the distance between the outer wall of the insulator 110 and the inner wall of the flange cylinder 131 is too short, the adhesive layer is too thin, and the bonding strength between the flange 130 and the insulator 110 is insufficient; when the distance between the outer wall of the insulator 110 and the inner wall of the flange cylinder 131 is too large, the adhesive layer is too thick and has insufficient strength, so that the composite insulator 100 is easy to mechanically damage.
Table 1 is test data of the influence of the ratio of the first glue groove 1311 to the first protrusion 1312 on the glue structure strength under the conditions of the same glue ratio (0.785), the same glue gap (0.5 mm), the same glue type and the same set of groove widths (24 mm) for the hollow insulating tube having the inner diameter of 180mm and the outer diameter of 197mm of the insulator 110.
TABLE 1 flexural failure results for samples of different ratios
| W First mucilage binding groove ：W First protrusion | Breaking load/KN | Breaking stress/MPa |
| 16:8＝2 | 47.8 | 315.25 |
| 15:9＝1.7 | 50.6 | 333.46 |
| 14:10＝1.4 | 54.0 | 356.14 |
| 14:10＝1.4 | 53.0 | 349.55 |
| 14:10＝1.4 | 53.0 | 349.55 |
| 12:12＝1 | 52.4 | 345.59 |
| 8:16＝0.5 | 51.3 | 338.33 |
As can be seen from table 1, under the conditions that the glue ratio, the glue gap, the glue type, the group of groove widths, the specifications and the materials of the insulator 110 are the same, as the ratio of the width of the first glue groove 1311 to the width of the first protrusion 1312 is reduced from 2 to 0.5, the bending fracture stress that the composite insulator 100 can withstand is maximized at a ratio of 1.4, and thereafter, the bending fracture stress gradually decreases as the ratio is reduced again. The greater the flexural failure stress, i.e., the force exerted on the sample at the moment the sample breaks, the better the mechanical properties of the sample.
Theoretically, when the insulator 110 and the adhesive reach the shear strength failure values of the respective materials at the same time, the adhesive structure of the composite insulator 100 has the highest strength, i.e. the bending failure stress that the composite insulator 100 can withstand is the largest. Therefore, the T-shaped test block is sheared between the axial layers of the hollow insulating tube having the inner diameter of 180mm and the outer diameter of 197mm and the adhesive, and the shearing strength of each test block is measured, and the method for measuring the shearing strength is consistent with the prior art, and is not repeated herein, so that the shearing strength between the axial layers of the insulating tube 110 with the specification is 30.1MPa, the shearing strength of the adhesive is 21.5MPa, and at this time, the ratio of the shearing strength of the insulating tube 110 to the shearing strength of the adhesive is 1.4, which is the same as the ratio of the width of the first adhesive groove 1311 to the width of the first protrusion 1312 when the bending fracture stress is maximum in table 1.
It can be seen that the composite insulator 100 can withstand the maximum flexural failure stress when the ratio of the width of the first glue groove 1311 to the width of the first protrusion 1312 is equal to the ratio of the shear strength of the insulator 110 to the shear strength of the adhesive.
In an application scenario, referring to fig. 2 and 6, a first seal groove 1314 is provided on a surface of the flange 132 facing the insulator 110, and a first seal 13141 is provided in the first seal groove 1314. A first seal 13141 is provided in the first seal groove 1314 to prevent external moisture or adhesive from entering the insulator 110, thereby preventing gas in the insulator 110 from leaking, and to prevent external moisture or adhesive from entering the flange 132, thereby affecting the seal between the insulator 110 and the flange 130.
With continued reference to fig. 2 and 6, the inner wall of the flange barrel 131 is further provided with a second sealing groove 1315 adjacent to the flange 132, the second sealing groove 1315 and the plurality of first glue grooves 1311 are sequentially arranged at intervals along a direction away from the flange 132, and a second sealing member 13151 is arranged in the second sealing groove 1315. Specifically, the second seal 13151 functions differently than the first seal 13141, and the second seal 13151 is configured to avoid that during the gluing process, the adhesive enters the first seal groove 1314 to corrode the first seal 13141, thereby disabling the first seal 13141.
The width of the first seal groove 1314 and/or the second seal groove 1315 remains constant in a direction toward the insulator 110 (as shown in fig. 6) or tapers (as shown in fig. 7). Specifically, the first seal groove 1314, the width of which remains unchanged in the direction approaching the insulator 110, is easy to process, but the first seal 13141 therein is easily slid or even dropped, and at this time, in order to avoid the relative sliding of the first seal 13141 in the first seal groove 1314, the first seal 13141 is fixed in the first seal groove 1314 by resin or silicone adhesive; while the first sealing groove 1314, which is gradually smaller in width in the direction approaching the insulator 110, is more complicated in processing than the first sealing groove 1314, which is maintained in width in the direction approaching the insulator 110, it can be ensured that the first sealing member 13141 does not easily fall off. The width of the first seal groove 1314 and/or the second seal groove 1315 may be linearly smaller in the direction approaching the insulator 110 (as shown in fig. 7), or may be curved smaller, without limitation.
The beneficial effects of the application are as follows: the ratio of the width of the first glue groove 1311 to the width of the first protrusion 1312 on the inner wall of the flange barrel 131 is equal to the ratio of the shearing strength of the insulator 110 to the shearing strength of the adhesive, and compared with the first glue groove and the first protrusion in other proportions, the setting can ensure the strength and the shearing resistance of the composite insulator 100.
Meanwhile, the circulation grooves 1313 communicated with the adjacent two first glue grooves 1311 are arranged on the inner wall of the flange cylinder 131, so that the glue injection rate can be improved, the bubble retention risk is reduced, the combination of the flange 130 and the insulator 110 is firmer, and the anti-torsion performance of the composite insulator 100 can be improved on the premise that the adhesive with better bonding performance is not replaced.
In addition, the second sealing groove 1315 and the second sealing member 13151 are further arranged on the inner wall of the flange cylinder 131, so that the first sealing member 13141 is prevented from being invalid due to the fact that adhesive in the gluing process enters the first sealing groove 1314 to corrode the first sealing member 13141.
The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application or directly or indirectly applied to other related technical fields are included in the scope of the present application.
Claims (10)
1. The utility model provides a composite insulator, includes insulator, cladding are fixed in the umbrella skirt of insulator periphery, with insulator tip fixed connection's flange, its characterized in that: the flange comprises a flange cylinder, the flange cylinder is arranged to be of a hollow structure along the axial direction of the composite insulator and sleeved at the end part of the insulator, a plurality of first glue grooves are formed in the inner wall of the flange cylinder at intervals along the axial direction so as to be filled with adhesive, the interval between two adjacent first glue grooves is a first bulge, the widths of the plurality of first glue grooves are equal, and the ratio of the width of the first glue groove to the width of the first bulge is equal to the ratio of the shear strength of the insulator to the shear strength of the adhesive;
the end outside of insulator is equipped with a plurality of edges the second mucilage binding groove that axial interval set up, and adjacent two interval between the second mucilage binding groove is the second arch, the second mucilage binding groove with first mucilage binding groove specification is the same just sets up, the second arch with first protruding specification is the same just sets up.
2. The composite insulator of claim 1, wherein: the cross section of the first bulge is rectangular.
3. The composite insulator of claim 1, wherein: the sum of the width of the first glue groove and the width of the first bulge is 16-32 mm.
4. The composite insulator of claim 1, wherein: the ratio of the length of the insulator sleeved on the inner wall part of the flange cylinder to the outer diameter of the insulator is 0.4-1.2.
5. The composite insulator of claim 1, wherein: in the radial direction of the composite insulator, the distance between the outer wall of the insulator and the inner wall of the flange cylinder is 0.25-0.75 mm.
6. The composite insulator of claim 1, wherein: the insulator is a hollow insulating tube, insulating gas is sealed in the insulator, and the absolute pressure value of the insulating gas ranges from 0.1Mpa to 0.15Mpa.
7. The composite insulator of claim 1, wherein: the inner wall of the flange cylinder is also provided with a circulation groove communicated with the plurality of first glue grooves, and the first glue grooves, the second glue grooves, the circulation groove and gaps between the outer wall of the insulator and the inner wall of the flange cylinder are filled with adhesive.
8. The composite insulator of claim 7, wherein: the bottom surface of the circulation groove is a plane or a curved surface.
9. The composite insulator of claim 1, wherein: the flange also comprises a flange plate, and one end of the flange cylinder far away from the insulator is covered;
the flange plate is provided with a first sealing groove facing the end face of the insulator towards the disc face of the insulator, and a first sealing piece is arranged in the first sealing groove; the method comprises the steps of,
the inner wall of the flange cylinder is provided with a second sealing groove adjacent to the flange plate, the second sealing groove and the first glue grooves are sequentially arranged at intervals along the direction away from the flange plate, and a second sealing piece is arranged in the second sealing groove.
10. The composite insulator of claim 9, wherein: the width of the first seal groove and/or the second seal groove is kept constant or gradually becomes smaller in the direction approaching the insulator.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017166979A1 (en) * | 2016-03-29 | 2017-10-05 | 江苏神马电力股份有限公司 | Insulator and glue binding method therefor |
| CN110211751A (en) * | 2019-04-26 | 2019-09-06 | 江苏神马电力股份有限公司 | Insulator and its adhesive binding method |
| CN112885544A (en) * | 2021-02-24 | 2021-06-01 | 江苏神马电力股份有限公司 | Post insulator and composite cross arm |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA2936775A1 (en) * | 2014-03-26 | 2015-10-01 | Exxonmobil Upstream Resarch Company | Annulus design for pipe-in-pipe system |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017166979A1 (en) * | 2016-03-29 | 2017-10-05 | 江苏神马电力股份有限公司 | Insulator and glue binding method therefor |
| CN110211751A (en) * | 2019-04-26 | 2019-09-06 | 江苏神马电力股份有限公司 | Insulator and its adhesive binding method |
| CN112885544A (en) * | 2021-02-24 | 2021-06-01 | 江苏神马电力股份有限公司 | Post insulator and composite cross arm |
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