Post insulators and composite crossarms

Abstract

The present application discloses a post insulator and a composite cross arm, the post insulator comprising: an insulator; an umbrella skirt, covering the outer periphery of the insulator; a first connection hardware, the two ends of the insulator are respectively connected with the first connection hardware to realize the installation of the post insulator, the first connection hardware comprising: a flange tube, which is arranged as a hollow structure along the axial direction and is sleeved on the end of the insulator; a flange, which covers the end of the flange tube away from the insulator; a first connecting plate, in the axial direction of the insulator, the first connecting plate extends outward from the side of the flange away from the flange tube, and in the radial direction of the insulator, the first connecting plate extends to the opposite sides of the flange tube and is connected to the flange tube; a second connecting plate, the side of the second connecting plate abuts against the plate surface of the first connecting plate and extends from the first connecting plate to the outer peripheral surface of the flange tube, so that a space for installation is formed between the first connecting plate and the second connecting plate. The above-mentioned configuration of the present application can improve the strength of the post insulator.

Description

Technical Field

[0001] The present application relates to the field of power transmission technology, and in particular to a post insulator and a composite crossarm. Background Art

[0002] Composite materials are one of the ideal materials for building transmission tower structures due to their advantages such as light weight, high strength, corrosion resistance, easy processing, designability and good insulation performance. Towers made of composite materials have the advantages of light weight, small tower head size, light structure, easy processing and molding, low transportation and assembly costs, corrosion resistance, high and low temperature resistance, high strength, low possibility of theft and low line maintenance costs.

[0003] The inventors of the present application have discovered that the performance of transmission towers currently made of composite materials needs to be improved, especially the strength of the support insulators in the composite crossarms needs to be improved. Summary of the invention

[0004] The purpose of the present application is to provide a post insulator and a composite crossarm, which can improve the strength of the post insulator.

[0005] To solve the above technical problems, a technical solution adopted in the present application is: to provide a post insulator, comprising: an insulator; an umbrella skirt, covering the periphery of the insulator; a first connecting hardware, both ends of the insulator are respectively connected to the first connecting hardware to achieve the installation of the post insulator, the first connecting hardware comprising: a flange tube, which is axially arranged as a hollow structure and sleeved on the end of the insulator; a flange disc, covering the end of the flange tube away from the insulator; a first connecting plate, in the axial direction of the insulator, the first connecting plate extends outward from the side of the flange disc away from the flange tube, and in the radial direction of the insulator, the first connecting plate extends to the opposite sides of the flange tube and is connected to the flange tube; a second connecting plate, the side of the second connecting plate abuts against the plate surface of the first connecting plate and extends from the first connecting plate to the outer peripheral surface of the flange tube, so that a space for installation is formed between the first connecting plate and the second connecting plate.

[0006] On the one hand, the flange covering the end of the flange tube away from the insulator in the first connecting fitting can prevent corrosion of the insulator by external moisture and the like, protect the insulator, and extend the service life of the post insulator. On the other hand, the first connecting fitting also includes a first connecting plate and a second connecting plate, which can improve the strength of the first connecting fitting and thereby improve the strength of the post insulator.

[0007] Wherein, the two first connecting plates at two ends of the insulator are arranged non-parallel.

[0008] The non-parallel arrangement of the two first connecting plates at both ends of the insulator enables the post insulator to be installed and used in different scenarios.

[0009] The inner wall of the flange cylinder is provided with a plurality of glue grooves spaced apart along the axial direction and a flow groove connecting the plurality of glue grooves, wherein the glue grooves and the flow grooves are filled with adhesive to fix the flange cylinder and the insulator.

[0010] The above-mentioned arrangement of the flow groove connecting to the glue installation groove can increase the glue injection rate and improve the anti-torsion performance of the composite cross arm without replacing the adhesive with better bonding performance.

[0011] There are multiple circulation grooves, and the multiple circulation grooves are arranged at intervals along the circumference of the flange tube; or, the bottom surface of the circulation groove is a plane or a curved surface.

[0012] When the bottom surface of the circulation groove is arranged to be a plane, the torsional strength of the composite cross arm can be improved.

[0013] Among them, the widths of the multiple glue grooves are equal, and the width of the glue groove is smaller than the width of the interval between two adjacent glue grooves; or, the width of the glue groove does not exceed 12mm; or, the ratio of the length of the contact part between the inner wall of the flange tube and the insulator to the outer diameter of the insulator is in the range of 0.8 to 1.2.

[0014] The above-mentioned setting that the width of the glue-fitting groove is smaller than the width of the interval between two adjacent glue-fitting grooves can improve the bending strength of the post insulator.

[0015] Wherein, the disk 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 member is provided in the first sealing groove; and the inner wall of the flange tube is provided with a second sealing groove adjacent to the flange, and the second sealing groove and the plurality of glue grooves are arranged in sequence at intervals in a direction away from the flange, and a second sealing member is provided in the second sealing groove; wherein the width of the first sealing groove and / or the second sealing groove remains unchanged or gradually decreases in the direction approaching the insulator.

[0016] The arrangement of the second sealing groove and the second sealing member can prevent the adhesive from entering the first sealing groove during the gluing process and corroding the first sealing member, thereby causing the first sealing member to fail. At the same time, the width of the first sealing groove and / or the second sealing groove gradually decreases in the direction close to the insulator, which can prevent the first sealing member and / or the second sealing member from falling off during the installation process.

[0017] Wherein, the insulator is a hollow insulating tube, the flange is provided with a sink groove on the disk surface away from the insulator, and a self-sealing valve is sunk in the sink groove; and / or, a drying device is provided in the insulator, and the drying device is installed on the disk surface of the flange close to the insulator.

[0018] The setting of the self-sealing valve can realize the extraction and filling of gas inside the insulator on the one hand, and can realize the sealing measurement and micro-water value measurement of the product before leaving the factory on the other hand; the setting of the drying device can keep the insulator dry.

[0019] The insulator is a solid insulating core, or the insulator is a hollow insulating tube, insulating gas is sealed in the hollow insulating tube, and the absolute pressure value of the insulating gas ranges from 0.1 to 0.15 MPa.

[0020] The insulator is set as a hollow insulating tube, and the insulating gas with an absolute pressure value ranging from 0.1 to 0.15 MPa is sealed inside the insulator, which can avoid daily maintenance and monitoring of the post insulator.

[0021] The umbrella skirt includes a plurality of identical umbrella bodies which are arranged at intervals, and the umbrella bodies are radially symmetrical relative to the insulator.

[0022] The radial symmetry of the umbrella body relative to the insulator is beneficial to the self-cleaning of the umbrella skirt and makes the post insulator resistant to dirt, rain flashover and ice flashover.

[0023] In order to solve the above technical problem, another technical solution adopted in the present application is: to provide a composite crossarm, including the above-mentioned post insulator.

[0024] The beneficial effects of the present application are as follows: on the one hand, the present application sets a flange plate in the first connecting hardware to cover the end of the flange tube away from the insulator, which can avoid corrosion of the insulator by external moisture and the like, protect the insulator, and extend the service life of the post insulator; on the other hand, the first connecting hardware also includes a first connecting plate and a second connecting plate, which can improve the strength of the first connecting hardware, and thus improve the strength of the post insulator.

[0025] At the same time, the present application also provides two first connecting plates at both ends of the insulator in a non-parallel manner so that the post insulator can be installed and used in different scenarios.

[0026] In addition, the present application also provides a flow groove connecting two adjacent glue grooves on the inner wall of the flange tube, which can increase the injection rate, reduce the risk of bubble retention, and make the connection between the first connecting hardware and the insulator more firmly, thereby improving the torsional resistance of the composite crossarm without replacing the adhesive with better bonding performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0028] Figure 1 It is a structural schematic diagram of an implementation method of a transmission tower;

[0029] Figure 2 yes Figure 1 Schematic diagram of the structure of the middle composite cross arm;

[0030] Figure 3 yes Figure 2 Schematic diagram of part of the structure of the composite cross arm;

[0031] Figure 4 yes Figure 2 A schematic diagram of the structure when the middle pillar insulator and the first connecting fitting are connected;

[0032] Figure 5 yes Figure 4 Schematic cross-section of the structure along section BB;

[0033] Figure 6 yes Figure 5 The enlarged schematic diagram of the center C;

[0034] Figure 7 yes Figure 4 A schematic diagram of the structure of the first connecting hardware;

[0035] Figure 8 yes Figure 7 A schematic diagram of the first connecting fitting at another angle;

[0036] Fig. 9 yes Figure 7 A schematic diagram of the first connecting fitting at another angle;

[0037] Fig.10 yes Figure 7 A cross-sectional schematic diagram of a first connecting fitting;

[0038] Fig.11 yes Fig.10 The enlarged schematic diagram of F in the middle;

[0039] Fig.12 yes Figure 5 The enlarged schematic diagram of point D in the middle;

[0040] Fig.13 yes Fig.12 An enlarged schematic diagram of point G in an application scenario;

[0041] Fig.14 yes Fig.12 An enlarged schematic diagram of point G in another application scenario;

[0042] Fig.15 yes Figure 5 The enlarged schematic diagram of point E in the middle;

[0043] Fig.16 yes Figure 2 Schematic diagram of the structure of the middle end fitting;

[0044] Fig.17 yes Fig.16 Schematic diagram of the end fitting at another angle;

[0045] Fig.18 yes Figure 3 The enlarged schematic diagram of point A in the middle;

[0046] Fig.19 It is a structural schematic diagram of an implementation method of a composite cross arm of the present application. DETAILED DESCRIPTION

[0047] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] See also Figures 1 to 5 The transmission tower 1000 includes a tower body 1100 and a composite cross arm 1200 connected to the tower body 1100 , and the composite cross arm 1200 includes a post insulator 1210 and a diagonal insulator 1220 .

[0049] There are two post insulators 1210 and two diagonal insulators 1220. One end of the two post insulators 1210 and the two diagonal insulators 1220 are connected to the tower body 1100 of the transmission tower 1000, and the other ends are connected together to form a composite cross arm 1200 for hanging the end of the transmission line, wherein the two diagonal insulators 1220 are located on the same side of the two post insulators 1210 and are respectively arranged adjacent to the two post insulators 1210, and the angle between the two post insulators 1210 ranges from 20° to 50°, for example, 20°, 30°, 40°, 45° or 50°, and the angle between the post insulator 1210 and the adjacent diagonal insulator 1220 ranges from 15° to 45°, for example, 15°, 30° or 45°.

[0050] Specifically, the tower body 1100 may be a transmission tower structure of common structures such as a lattice iron tower, a pole body or a composite pole tower. In the present embodiment, the tower body 1100 is a lattice iron tower, wherein the accompanying drawings only show part of its structure.

[0051] At the same time, the arrangement of the two post insulators 1210 and the two inclined insulators 1220 allows a stable triangular structure to be formed between the composite cross arm 1200 and the tower body 1100, which can greatly improve the stability of the composite cross arm 1200.

[0052] In addition, considering that the larger the angle between the two post insulators 1210, the greater the mechanical strength that the composite cross arm 1200 can withstand, but the length of the composite cross arm 1200 and the width of the tower body 1100 also need to be increased accordingly, the angle between the two post insulators 1210 is controlled within a range of 20° to 50°, which not only meets the force requirements of the composite cross arm 1200, but also optimizes the length of the composite cross arm 1200 and the width of the tower body 1100. Similarly, controlling the angle between the post insulator 1210 and the adjacent diagonal insulator 1220 within a range of 15° to 45° can also achieve the same purpose.

[0053] Specifically, Figure 1 As shown, three groups of composite cross arms are arranged on the tower body 1100 from bottom to top, specifically, composite cross arm 1200, composite cross arm 1300 and composite cross arm 1400. The lengths of composite cross arms 1200, composite cross arms 1300 and composite cross arms 1400 extending out of the tower body 1100 are decreasing or increasing or in other forms. That is to say, the lengths of the post insulators are decreasing or increasing or in other forms from bottom to top, and the longer the length of the post insulator 1210 is, the smaller the angle between the two post insulators 1210 is. Figure 2 , assuming that the angle between the two post insulators 1210 is α, the lengths of the two post insulators 1210 are both L, and the width of the tower body 1100 in the horizontal direction perpendicular to the symmetry axis of the two post insulators 1210 is D, it can be obtained from the trigonometric formula:

[0054]

[0055] In an application scenario, taking a 500kV transmission tower 1000 as an example, the range of L is 4000mm to 8000mm, and the range of D is 2500mm to 3500mm. It can be calculated that the minimum value of α is 18°, and the maximum value of α is 51.8°. Therefore, the angle range between the two post insulators 1210 can be controlled within 20° to 50°.

[0056] Likewise, combining Figure 3, assuming that the angle between the post insulator 1210 and the adjacent diagonal insulator 1220 is β, and assuming that the distance between the connection point of the post insulator 1210 on the tower body 1100 and the connection point of the adjacent diagonal insulator 1220 on the tower body 1100 is H, the trigonometric formula can be obtained:

[0057]

[0058] Taking a 500kV transmission tower 1000 as an example, H is generally set to 2500mm, from which it can be calculated that the minimum value of β is 14.2° and the maximum value of β is 43°. Since the size of H can be adjusted again, the angle range between the post insulator 1210 and the adjacent inclined insulator 1220 is controlled within 15° to 45°.

[0059] At the same time, setting the angle range between the two post insulators 1210 to 20° to 50° can also provide favorable conditions for setting the first equalizing ring 12101 on the high-voltage end (the end away from the tower body 1100) of the post insulator 1210 and setting the end hardware 1240 (described in detail below) to connect the post insulator 1210 and the inclined insulator 1220. Specifically, it can ensure that the first equalizing rings 12101 on the two post insulators 1210 do not interfere with each other, and that the first equalizing ring 12101 and the umbrella skirt 1212 (described in detail below) and the end hardware 1240 of the post insulator 1210 do not interfere with each other.

[0060] And setting the angle range between the post insulator 1210 and the adjacent diagonal insulator 1220 to 15° to 45° can provide favorable conditions for installing the first equalizing ring 12101 on the high-voltage end of the post insulator 1210 and the second equalizing ring 12201 on the high-voltage end (the end away from the tower body 1100) of the diagonal insulator 1220. Specifically, it can ensure that the first equalizing ring 12101 and the second equalizing ring 12201 do not interfere with each other when they are installed in an offset manner.

[0061] Continue reading Figure 1 In this embodiment, the installation heights of the two post insulators 1210 are the same, and the installation heights of the two oblique-pull insulators 1220 are the same. At the same time, the two oblique-pull insulators 1220 are both located above or below the two post insulators 1210 (the figure illustrates that the two oblique-pull insulators 1220 are both located above the two post insulators 1210).

[0062] The two post insulators 1210 may be arranged horizontally ( Figure 1 The horizontal setting is used as an illustration), or the tilted setting is also possible.

[0063] At the same time, in this embodiment, the angles between the two post insulators 1210 and the adjacent oblique insulators 1220 are equal, that is, the composite crossarm 1200 is a symmetrical structure to ensure that the composite crossarm 1200 is uniformly stressed, but the present application is not limited to this. For example, in other embodiments, the angle between one post insulator 1210 and the adjacent oblique insulator 1220 is 20°, and the angle between the other post insulator 1210 and the adjacent oblique insulator 1220 is 45°.

[0064] See also Figure 4 and Figure 5 In this embodiment, the post insulator 1210 includes an insulator 1211 and an umbrella skirt 1212 wrapped around the outer periphery of the insulator 1211 .

[0065] Specifically, the insulator 1211 can be a solid insulating core or a hollow insulating tube. When the insulator 1211 is a solid insulating core, it can be a solid core rod formed by glass fiber or aramid fiber impregnated with epoxy resin and wound or pultruded or pultruded and wound. When the insulator 1211 is a hollow insulating tube, it can be a hollow pultruded tube formed by glass fiber or aramid fiber impregnated with epoxy resin and pultruded and wound. It can also be a glass fiber reinforced plastic tube formed by glass fiber impregnated with epoxy resin and wound and cured or pultruded. It can also be an aramid fiber tube formed by aramid fiber impregnated with epoxy resin and wound and cured. There is no limitation here.

[0066] The insulator 1211 may be cylindrical (the figure shows a cylindrical shape), conical or other shapes (such as drum shape), without limitation. When the insulator 1211 is conical, its conical end (the end with a smaller diameter) is connected to the end fitting 1240, and the other end is connected to the tower body 1100.

[0067] In one application scenario, when the insulator 1211 is a hollow insulating tube, insulating gas is sealed in the insulator 1211, and the absolute pressure value of the insulating gas ranges from 0.1 to 0.15 MPa, for example, 0.1 MPa, 0.12 MPa or 0.15 MPa.

[0068] Specifically, the gas sealed in the hollow insulating tube can be high-purity nitrogen, air, sulfur hexafluoride or other gases that have been dried, and there is no limitation here.

[0069] At the same time, setting the absolute pressure range of the insulating gas to 0.1-0.15Mpa can prevent the insulating gas from leaking from the hollow insulating tube, avoiding the daily maintenance and monitoring of the post insulator 1210, and meeting the different pressure usage requirements in different regions and altitudes, thereby ensuring that the internal gas of the hollow insulating tube is in a non-negative pressure state when used in different regions. At the same time, it can also enable the hollow insulating tube to have a larger micro-water control margin, effectively reducing the difficulty of micro-water control.

[0070] In other application scenarios, when the insulator 1211 is a hollow insulating tube, its interior may also be sealed with an inert gas or a solid material such as polyurethane, liquid silicone rubber, etc., which is not limited here.

[0071] Meanwhile, the umbrella skirt 1212 can be made of materials such as high temperature vulcanized silicone, liquid silicone rubber or room temperature vulcanized silicone rubber, and there is no limitation here.

[0072] Combination Figure 5 and Figure 6 In this embodiment, the umbrella skirt 1212 includes a plurality of identical umbrella bodies 12121 that are spaced apart from each other, that is, all the umbrella bodies 12121 are identical, and at the same time, the umbrella bodies 12121 are radially symmetrical relative to the insulator 1211, that is, the inclination directions of the two surfaces of the umbrella bodies 12121 that are arranged opposite to each other are opposite and the inclination angles are the same. Specifically, the umbrella body 12121 is arranged to be radially symmetrical relative to the insulator 1211. On the one hand, compared with the prior art in which the two surfaces of the umbrella body 12121 arranged opposite to each other are inclined in the same direction, rainwater can flow down along the umbrella skirt 1212 (if the two surfaces of the umbrella body 12121 arranged opposite to each other are inclined in the same direction, rainwater is easily accumulated in the angle between the support insulator 1210 and the umbrella body 12121), so that no water film is formed on the surface of the umbrella skirt 1212, and the umbrella skirt 1212 is beneficial to self-cleaning. On the other hand, the two sides of the umbrella body 12121 arranged opposite to each other can have the same mechanical properties, so that the support insulator 1210 has the characteristics of resistance to dirt, rain flash resistance, ice flash resistance and more economical.

[0073] In one application scenario, in order to avoid turbulence and dirt accumulation between two adjacent parachute bodies 12121 and cause bridging, the spacing between two adjacent parachute bodies 12121 is greater than 40 mm and does not exceed 60 mm, for example, 45 mm, 50 mm or 60 mm. Of course, the distance between two adjacent parachute bodies 12121 should be minimized, so that the distribution density of the parachute bodies 12121 can be increased, making it inconvenient for birds to stand on the sheath, thereby preventing bird damage accidents. At the same time, under the requirement of ensuring the minimum creepage distance, the height of the parachute body 12121 protruding from the side of the insulator 1211 is set to be no more than 80 mm, generally set to 50 mm to 80 mm, for example, 50 mm, 60 mm or 70 mm, etc.

[0074] It should be noted that, in other embodiments, the umbrella skirt 1212 can also be other structures. For example, two adjacent umbrella bodies 12121 are of different sizes, or two oppositely disposed surfaces of the umbrella body 12121 are inclined in the same direction. In short, the present application does not limit the specific structure of the umbrella skirt 1212.

[0075] Continue reading Figure 4 In this embodiment, the post insulator 1210 further includes a first connection fitting 1230, and both ends of the post insulator 1210 are respectively connected with the first connection fittings 1230 to realize the installation of the post insulator 1210, that is, the first connection fitting 1230 connected to one end of the post insulator 1210 is used to connect the post insulator 1210 to the tower body 1100, and the first connection fitting 1230 connected to the other end of the post insulator 1210 is used to connect the post insulator 1210 to the inclined insulator 1220, and at the same time Figure 7 , Figure 8 and Fig. 9 The first connecting fitting 1230 includes: a flange tube 1231, a flange plate 1232, a first connecting plate 1233 and a second connecting plate 1234.

[0076] Among them, the flange cylinder 1231 is set as a hollow structure in the axial direction and is sleeved on the end of the insulator 1211; the flange plate 1232 covers the end of the flange cylinder 1231 away from the insulator 1211, wherein the flange cylinder 1231 and the flange plate 1232 can be integrally formed, or can be separately formed and then connected together by means such as welding; the first connecting plate 1233 extends from the side of the flange plate 1232 away from the flange cylinder 1231 to the opposite sides of the flange cylinder 1231 and is connected to the flange cylinder 1231, that is, in the axial direction of the post insulator 1210, the first connecting plate 1233 extends outward from the side of the flange plate 1232 away from the flange cylinder 1231, and in the radial direction of the post insulator 1210, the first connecting plate 1233 The connecting plate 1233 extends to the opposite sides of the flange tube 1231 and is connected to the flange tube 1231; the side of the second connecting plate 1234 abuts against the plate surface of the first connecting plate 1233 and extends from the first connecting plate 1233 to the outer peripheral surface of the flange tube 1231, so that an installable space is formed between the first connecting plate 1233 and the second connecting plate 1234. The installable space can be used to place locking parts (such as bolts, etc.) that lock the post insulator 1210 with the tower body 1100 or the inclined insulator 1220. It can be understood that the setting of the second connecting plate 1234 can indirectly increase the contact area between the first connecting plate 1233 and the flange tube 1231, thereby improving the strength of the first connecting hardware 1230.

[0077] Specifically, a flange 1232 is provided to cover the end of the flange tube 1231 away from the insulator 1211, so as to prevent corrosion of the insulator 1211 by external moisture and the like, thereby protecting the insulator 1211 and extending the service life of the post insulator 1210. At the same time, the provision of the first connecting plate 1233 and the second connecting plate 1234 can improve the strength of the first connecting hardware 1230, thereby improving the strength of the post insulator 1210.

[0078] At the same time, in order to enable the post insulator 1210 to be installed and applied in different scenarios, the two first connecting plates 1233 at both ends of the post insulator 1210 are arranged non-parallel, wherein the relative angle of the two first connecting plates 1233 arranged non-parallel is determined by the actual conditions such as the connection structure on the tower body 1100 and the connection structure on the inclined insulator 1220, and is not limited here. In one embodiment, the two first connecting plates 1233 are arranged vertically, that is, the relative angle of the two first connecting plates 1233 is 90°.

[0079] In order to prevent the first connecting hardware 1230 from being corroded by water vapor, etc., the surface of the first connecting hardware 1230 is hot-dip galvanized. At the same time, the internal material of the first connecting hardware 1230 can be cast aluminum, cast iron or alloy steel, etc., which is not limited here.

[0080] At the same time, the various parts of the first connecting fitting 1230 can be connected together by welding or other methods.

[0081] See also Figure 4 and Fig.10 In this embodiment, the inner wall of the flange cylinder 1231 is provided with a plurality of glue grooves 12311 spaced apart along the axial direction and a flow groove 12312 connecting the plurality of glue grooves 12311 , wherein the glue grooves 12311 and the flow grooves 12312 are filled with adhesive to fix the flange cylinder 1231 and the insulator 1211 .

[0082] Specifically, during the production process, a horizontal gluing process or a vertical gluing process is used to connect the first connecting hardware 1230 and the support insulator 1210 together: during the production process, the adhesive is first injected between the flange tube 1231 and the insulator 1211 through the glue injection hole, and then after a certain period of high-temperature curing, the first connecting hardware 1230 and the support insulator 1210 can be fixedly connected together.

[0083] The setting of the circulation groove 12312 can make the adhesive injected between the flange tube 1231 and the insulator 1211 flow between adjacent glue grooves 12311, thereby increasing the injection rate and reducing the risk of bubble retention, making the combination of the first connecting hardware 1230 and the insulator 1211 more firmly, thereby improving the torsional resistance of the composite crossarm 1200 without replacing the adhesive with better bonding performance.

[0084] The number of the circulation grooves 12312 may be one or more (for example, two, four, six or even more), and when the number of the circulation grooves 12312 is more than one, the plurality of circulation grooves 12312 are arranged at intervals along the circumference of the flange cylinder 1231. One circulation groove 12312 may only connect two adjacent adhesive grooves 12311, or may connect three, four or even all adjacent adhesive grooves 12311, which is not limited here.

[0085] The bottom surface of the circulation groove 12312 is a plane or a curved surface. Specifically, when the radial depth and width of the circulation groove 12312 relative to the first connection fitting 1230 are constant, the circulation groove 12312 with a plane bottom surface is more complicated to process and has a higher processing cost than the circulation groove 12312 with a curved bottom surface, but has a higher torsional strength, because the contact area between the adhesive in the plane groove and the inner wall of the flange cylinder 1231 is larger, that is, the circulation groove 12312 with a curved bottom surface is easier to process and has a lower processing cost than the circulation groove 12312 with a plane bottom surface, but has a slightly lower torsional strength.

[0086] Among them, Fig.11 As shown, the widths of the plurality of glue grooves 12311 are equal, and the width of the glue groove 12311 is smaller than the width of the interval between two adjacent glue grooves 12311. Specifically, by setting the width of the glue groove 12311 to be smaller than the width of the interval between two adjacent glue grooves 12311, the glue matching groove 121101 (such as Fig.12 and Fig.13 As shown, the width of the glue matching groove 121101 on the insulator 1211 and the glue matching groove 12311 on the flange tube 1231 (which have the same specifications and are arranged opposite to each other) is also smaller than the width of the interval between two adjacent glue matching grooves 121101. Compared with the width of the glue matching groove 121101 being greater than or equal to the width of the interval between two adjacent glue matching grooves 121101, this arrangement can ensure the shear resistance of the post insulator 1210.

[0087] Specifically, the axial shear strength of the insulator 1211 itself is relatively low, and when it is damaged, the first damaged part is the part that is sleeved into the flange cylinder 1231 and is not bonded with adhesive, that is, the part of the insulator 1211 adjacent to the two adhesive matching grooves 121101. When the width of the flange tube 1231 is constant, if the width of the glue groove 12311 is reduced, the distance between two adjacent glue grooves 12311 will increase, that is, the distance between two adjacent glue matching grooves 121101 on the insulator 1211 will increase, and its strength against shear failure will increase, ultimately enhancing the shear resistance of the post insulator 1210 of the same specification. However, if the width of the glue groove 12311 is too small, it will lead to an increase in processing time and processing cost. Therefore, the width of the glue groove 12311 is set not to exceed 12mm, for example, 12mm, 10mm or 8mm, etc., which can not only ensure the strength of the composite crossarm 1200, but also ensure that the processing time and processing cost are within a reasonable range.

[0088] In order to facilitate processing, the bottom surface of the glue groove 12311 is a curved surface.

[0089] Among them, the ratio of the length of the contact portion between the inner wall of the flange tube 1231 and the insulator 1211 to the outer diameter of the insulator 1211 (i.e., the gluing ratio) ranges from 0.8 to 1.2, for example, 0.8, 1.0 or 1.2. Specifically, as the gluing ratio decreases, the strength of the composite crossarm 1200 will decrease significantly. For example, compared with a gluing ratio of 0.8, when the gluing ratio decreases to 0.75, the strength of the composite crossarm 1200 will decrease by 20%, and compared with a gluing ratio of 1.2, when the gluing ratio increases to 1.4, the strength of the composite crossarm 1200 will increase slightly, but the cost will increase significantly. Therefore, setting the gluing ratio range to 0.8 to 1.2 can make the composite crossarm 1200 have the advantages of low cost and high strength at the same time.

[0090] It should also be noted that in other embodiments, the glue groove 12311 and the circulation groove 12312 can also be other sizes, which are not limited here.

[0091] In one application scenario, combined with Fig.12 and Fig.13The flange 1232 has a first sealing groove 12313 facing the end face of the insulator 1211 on its disk surface facing the insulator 1211, and a first sealing member 123131 is provided in the first sealing groove 12313. Specifically, the first sealing member 123131 is provided in the first sealing groove 12313 to prevent external water vapor or adhesive from entering the insulator 1211, thereby preventing gas leakage in the insulator 1211, and to prevent external water vapor or adhesive from entering the flange 1232, thereby affecting the seal between the insulator 1211 and the first connection fitting 1230.

[0092] Continue reading Fig.12 and Fig.13 The inner wall of the flange cylinder 1231 is also provided with a second sealing groove 12314 adjacent to the flange plate 1232. The second sealing groove 12314 and the plurality of gluing grooves 12311 are sequentially arranged in a direction away from the flange plate 1232. A second sealing member 123141 is provided in the second sealing groove 12314. Specifically, the second sealing member 123141 has a different function from the first sealing member 123131. The second sealing member 123141 is used to prevent the adhesive in the gluing process from entering the first sealing groove 12313 to corrode the first sealing member 123131 and cause the first sealing member 123131 to fail.

[0093] The width of the first sealing groove 12313 and / or the second sealing groove 12314 remains unchanged in the direction close to the insulator 1211 (eg Fig.13 as shown) or gradually decreases (as shown Fig.14 As shown). Specifically, the first sealing groove 12313 whose width remains unchanged in the direction close to the insulator 1211 is easy to process, but the first sealing component 123131 therein is prone to sliding or even falling off. At this time, in order to avoid the first sealing component 123131 from sliding relative to each other in the first sealing groove 12313, the first sealing component 123131 is fixed in the first sealing groove 12313 by bonding with resin or silicone. Compared with the first sealing groove 12313 whose width remains unchanged in the direction close to the insulator 1211, the first sealing groove 12313 whose width gradually decreases in the direction close to the insulator 1211 has a more complicated processing process, but it can ensure that the first sealing component 123131 will not fall off easily. Among them, the width of the first sealing groove 12313 and / or the second sealing groove 12314 can be linearly reduced in the direction close to the insulator 1211 (such as Fig.14 It can also be reduced in a curve, which is not limited here.

[0094] In one application scenario, combined with Figure 5 , Fig.12 and Fig.15When the insulator 1211 is a hollow insulating tube, a sink 12321 is provided on the surface of the flange 1232 away from the insulator 1211, and a self-sealing valve 12322 is sunk in the sink 12321. Specifically, the self-sealing valve 12322 is used for extracting and filling the gas in the insulator 1211, and for sealing measurement and micro-water value measurement before the product leaves the factory (after the product is tested and qualified, the self-sealing valve 12322 needs to be sealed with materials such as liquid silicone rubber or epoxy resin).

[0095] Meanwhile, when the insulator 1211 is a hollow insulating tube, a drying device 12111 is provided inside the insulator 1211, and the drying device 12111 is installed on the disk surface of the flange 1232 close to the insulator 1211. Specifically, the drying device 12111 is used to keep the inside of the insulator 1211 dry. Fig.12 As shown, the drying device 12111 is in the shape of a cage, which is inverted on the flange 1232, and the drying device 12111 is provided with through holes 121111 of uniform size and evenly distributed to form a shielding cage, so as to utilize the shielding cage principle to ensure that the drying device 12111 does not affect the internal electric field of the insulator 1211. At the same time, a desiccant is provided inside the drying device 12111, and the desiccant can be a molecular sieve desiccant, etc., which is not limited here.

[0096] It should be noted that the present application does not limit the specific structure and number of the drying devices 12111 , and the number of the drying devices 12111 may be one, two or more.

[0097] It should be noted that the flange 1232 of the first connection fitting 1230 can be installed with both the self-sealing valve 12322 and the drying device 12111, or can be installed with only one of the self-sealing valve 12322 and the drying device 12111 (for example, in combination with Figure 5 , Fig.12 and Fig.15 It can be seen that, of the two flanges 1232 at both ends of the support insulator 1210, one is only equipped with a drying device 12111, and the other is only equipped with a self-sealing valve 12322).

[0098] Combination Figure 2 , Fig.16 and Fig.17 In this embodiment, the composite crossarm 1200 also includes an end fitting 1240 for realizing the connection between the post insulator 1210 and the diagonal insulator 1220 , wherein the end fitting 1240 includes a connecting column 1241 , a post connecting plate 1242 , a diagonal connecting plate 1243 and a wire hanging plate 1244 .

[0099] The connecting column 1241 is cylindrical, and the side of the support connecting plate 1242 is in contact with the outer peripheral surface of the connecting column 1241, wherein the other ends of the two support insulators 1210 that are not connected to the tower body 1100 are installed on the support connecting plate 1242 along the axial interval of the connecting column 1241 (the two support insulators 1210 are installed on the same side or different sides of the support connecting plate 1242), and the number of the inclined connecting plates 1243 is two, and the two inclined connecting plates 1243 are both arranged on the same side of the support connecting plate 1242, and the inclined connecting plates 1243 are connected to the inclined connecting plates 124 The side edge adjacent to one end of the support connecting plate 1242 abuts against the outer peripheral surface of the connecting column 1241, and is used to respectively install the other ends of the two inclined insulators 1220 that are not connected to the tower body 1100. The wire hanging plate 1244 is located on the other side of the support connecting plate 1242 away from the inclined connecting plate 1243 and extends along the outer peripheral surface of the connecting column 1241 to form a semi-enclosed structure, and is used to hang the transmission line. The wire hanging plate 1244 is provided with a wire hanging portion 12441 for hanging the transmission line, wherein the wire hanging portion 12441 can be specifically a wire hanging hole, and the number of the wire hanging holes can be one or two ( Fig.17 Two are used for illustration) or more, and there is no limitation here. It can be understood that the hanging plate 1244 is also provided with a construction hole 12442 for construction lifting. One or more construction holes 12442 can be set, and there is no limitation here.

[0100] Continue reading Fig.17 There are two wire hanging plates 1244, and the two wire hanging plates 1244 are arranged at intervals along the axial direction of the connecting column 1241. In this way, an intermediate connecting piece (not shown) can be arranged in the space between the two wire hanging plates 1244, and the intermediate connecting piece can be connected to the wire hanging parts 12441 on the two wire hanging plates 1244 through a locking piece (such as a bolt), and then a wire hanging fitting is hung on the intermediate connecting piece to hang the power transmission line. In other words, at this time, the two wire hanging plates 1244 jointly bear the tension of the power transmission line, avoiding that one wire hanging plate 1244 is easily damaged when it bears the tension of the power transmission line alone, thereby improving the mechanical strength of the end fitting 1240 as a whole.

[0101] In one application scenario, the end fitting 1240 further includes a support plate 1246, which covers the end face of the connecting column 1241 and extends outward from the connecting column 1241 to connect with one side of the pillar connecting plate 1242, that is, the support plate 1246 simultaneously connects the end face of the connecting column 1241 and one side of the pillar connecting plate 1242, and the support plate 1246 is provided in two pieces, which respectively cover the two end faces of the connecting column 1241 and connect with the two sides of the pillar connecting plate 1242. On the one hand, the support plate 1246 can be used to cover the end face of the connecting column 1241, and on the other hand, the support plate 1246 connects the connecting column 1241 and the pillar connecting plate 1242 together, which can enhance the overall stability of the end fitting 1240.

[0102] In another application scenario, the end fitting 1240 further includes a reinforcement 1247, which is arranged on the outer peripheral surface of the connecting column 1241 along the axial direction of the connecting column 1241. Specifically, the reinforcement 1247 is a plate member, which connects the oblique connecting plate 1243 and the support plate 1246 at the same time, that is, the plate surface of the reinforcement 1247 is connected to the oblique connecting plate 1243, and the two sides of the reinforcement 1247 are connected to the plate surface of the support plate 1246 close to the connecting column 1241, thereby further strengthening the overall stability of the end fitting 1240 and improving the mechanical strength.

[0103] Similar to the first connecting fitting 1230, the surface of the end fitting 1240 is also hot-dip galvanized, and its internal material can also be cast aluminum, cast iron or alloy steel, and the various parts of the first connecting fitting 1230 can also be connected together by welding or the like.

[0104] In this embodiment, combined with Figure 2 and Fig.16 A third pressure-equalizing ring 1245 is also installed at both ends of the connecting column 1241. Specifically, a connecting hole (not shown) is provided on the support plate 126, and the third pressure-equalizing ring 1245 is fixedly connected to the end hardware 1240 through the connecting hole. The third pressure-equalizing ring 1245 can be a circular pressure-equalizing ring, a runway-shaped pressure-equalizing ring or other special-shaped pressure-equalizing ring, which is not limited here.

[0105] See also Fig.16 In this embodiment, the inclined connecting plate 1243 is provided with a through hole 12431, and a metal piece 12432 is embedded in the through hole 12431. The metal piece 12432 is axially arranged as a hollow structure for allowing a locking piece (such as a bolt) to pass through and install the inclined insulator 1220 on the inclined connecting plate 1243.

[0106] Specifically, the metal member 12432 is used to increase the connection strength of the oblique connecting plate 1243 to prevent the oblique connecting plate 1243 from cracking under long-term stress. The material of the metal member 12432 can be iron, aluminum, alloy steel and other materials, which are not limited here.

[0107] Combination Figure 3 and Fig.18 In this embodiment, the composite cross arm 1200 further includes a second connecting fitting 1250 for connecting the tower body 1100 and the inclined insulator 1220 , and the second connecting fitting 1250 includes a first sub-connecting fitting 1251 and a second sub-connecting fitting 1252 .

[0108] The first sub-connection fitting 1251 is connected to the inclined insulator 1220; one end of the second sub-connection fitting 1252 is connected to the first sub-connection fitting 1251 in an adjustable position, and the other end is used to connect the tower body 1100, thereby realizing the connection between the inclined insulator 1220 and the tower body 1100. Specifically, the second sub-connection fitting 1252 is arranged to be connected to the first sub-connection fitting 1251 in an adjustable position, so that the structure of the composite cross arm 1200 can be varied and suitable for different application scenarios.

[0109] In an application scenario, such as Fig.18 As shown, the first sub-connection fitting 1251 is provided with a plurality of arc-shaped mounting portions 12511, and the second sub-connection fitting 1252 is selectively connected to a mounting portion 12511. Specifically, the plurality of mounting portions 12511 are arranged along an arc, so that the distance and relative angle between the tower body 1100 and the inclined insulator 1220 can be adjusted.

[0110] In an application scenario, such as Fig.18 As shown, the first sub-connecting fitting 1251 is a fan-shaped flat-foot fitting, and the second sub-connecting fitting 1252 is a slot fitting.

[0111] In other embodiments, the plurality of mounting portions 12511 may also be arranged in a straight line along the extension direction of the oblique-pull insulator 1220 , which is not limited here.

[0112] In other implementations, the second sub-connecting fitting 1252 may be connected to the inclined insulator 1220 , and the first sub-connecting fitting 1251 may be connected to the tower body 1100 , which is not limited here.

[0113] See also Fig.19 , Fig.19It is a structural schematic diagram of an embodiment of a composite cross-arm of the present application, wherein the composite cross-arm 2000 comprises two post insulators 2100 and two diagonal insulators 2200, wherein one end of the two post insulators 2100 and the two diagonal insulators 2200 are both used to be connected to the tower body of a transmission tower, and the other ends are connected together to form a composite cross-arm 2000 for hanging the end of a transmission line, wherein the two diagonal insulators 2200 are located on the same side of the two post insulators 2100 and are respectively arranged adjacent to the two post insulators 2100, and the angle between the two post insulators 2100 ranges from 20° to 50°, and the angle between the post insulator 2100 and the adjacent diagonal insulator 2200 ranges from 15° to 45°.

[0114] The composite cross arm 2000 in this embodiment has the same structure as the composite cross arm 1200 in any of the above embodiments. For details, please refer to the above embodiments, which will not be described again.

[0115] The above description is only an implementation method of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A post insulator, characterized in that: include: Insulator; An shed skirt is covered on the outer periphery of the insulator; A first connection fitting, with the first connection fittings being connected to both ends of the insulator to achieve installation of the post insulator, the first connection fitting comprising: A flange cylinder is axially arranged as a hollow structure and sleeved on the end of the insulator; A flange plate, covering an end of the flange tube away from the insulator; A first connecting plate, which extends outward from the flange plate away from the flange cylinder in the axial direction of the insulator, and extends to opposite sides of the flange cylinder in the radial direction of the insulator to be connected to the flange cylinder; A second connecting plate, the side of which abuts against the plate surface of the first connecting plate and extends from the first connecting plate to the outer peripheral surface of the flange tube, so that a space for installation is formed between the first connecting plate and the second connecting plate; The inner wall of the flange cylinder is provided with a plurality of glue grooves spaced apart along the axial direction, wherein the glue grooves are filled with adhesive to fix the flange cylinder and the insulator; The width of the adhesive groove does not exceed 12 mm, and the ratio of the length of the inner wall of the flange cylinder in contact with the insulator to the outer diameter of the insulator is in the range of 0.8 to 1.2; The flange plate is provided with a first sealing groove facing the end face of the insulator on its disk surface facing the insulator, and a first sealing member is provided in the first sealing groove; and the inner wall of the flange tube is provided with a second sealing groove adjacent to the flange plate, and the second sealing groove and the plurality of glue grooves are arranged in sequence at intervals in a direction away from the flange plate, and a second sealing member is provided in the second sealing groove.

2. The post insulator according to claim 1, characterized in that: The two first connecting plates at two ends of the insulator are arranged non-parallel.

3. The post insulator according to claim 1, characterized in that: The inner wall of the flange cylinder is also provided with a flow groove connecting the plurality of the adhesive grooves, wherein the flow groove is also filled with adhesive to fix the flange cylinder and the insulator.

4. The post insulator according to claim 3, characterized in that: There are multiple flow grooves, and the multiple flow grooves are arranged at intervals along the circumference of the flange tube; or, The bottom surface of the flow channel is a flat surface or a curved surface.

5. The post insulator according to claim 1, characterized in that: The widths of the plurality of glue-binding grooves are equal, and the width of the glue-binding groove is smaller than the width of the interval between two adjacent glue-binding grooves.

6. The post insulator according to claim 1, characterized in that: The width of the first sealing groove and / or the second sealing groove remains constant or gradually decreases in a direction approaching the insulator.

7. The post insulator according to claim 1, characterized in that: The insulator is a hollow insulating tube, the flange is provided with a sink groove on its surface away from the insulator, and a self-sealing valve is sunk in the sink groove; and / or, A drying device is provided in the insulator and is mounted on the disk surface of the flange disk close to the insulator.

8. The post insulator according to claim 1, characterized in that: The insulator is a solid insulating core, or the insulator is a hollow insulating tube, and insulating gas is sealed in the hollow insulating tube, and the absolute pressure value of the insulating gas ranges from 0.1 to 0.15 MPa.

9. The post insulator according to claim 1, characterized in that: The umbrella skirt includes a plurality of identical umbrella bodies which are arranged at intervals, and the umbrella bodies are radially symmetrical relative to the insulator.

10. A composite cross arm, characterized in that: The invention comprises a post insulator as claimed in any one of claims 1 to 9.

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