A method for manufacturing a post insulator

Abstract

The present invention discloses a method for manufacturing a post insulator, comprising the following steps: step ①: providing a hollow insulating tube and two flanges, wherein the inner diameter of the flanges is slightly larger than the outer diameter of the hollow insulating tube; step ②: integrally covering the hollow insulating tube with an umbrella skirt; step ③: respectively fixing the two flanges to the two ends of the hollow insulating tube by gluing; step ④: gluing the gap between the flange and the hollow insulating tube to obtain the post insulator. The method for manufacturing a post insulator of the present invention is simple, convenient to manufacture, low in manufacturing cost, high in production efficiency, and improves the connection strength between the various components of the post insulator.

Description

Technical Field

[0001] The present invention relates to the technical field of power transmission and transformation and offshore wind power new energy insulation equipment, and in particular to a method for manufacturing a post insulator. Background Art

[0002] Currently, the post insulators in the industry include the following technical routes: ① Room temperature vulcanized silicone rubber (RTV) coating on porcelain insulators; ② Porcelain core composite post insulators, that is, the shed is made of silicone rubber and the core rod is made of porcelain insulators; ③ Solid composite post insulators, that is, a solid core of composite materials; ④ Hollow composite insulators filled with solid insulating medium; ⑤ Hollow composite insulators filled with pressurized gas, and the outer insulating sheds of the latter three types are all made of silicone rubber materials.

[0003] In order to improve the mechanical properties of the post insulator, it is necessary to propose a method for manufacturing the post insulator and strengthen the connection between the various components of the post insulator. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a method for manufacturing a post insulator, which has a simple manufacturing process, low manufacturing cost, high production efficiency, and improves the connection strength between the various components of the post insulator.

[0005] To achieve the above-mentioned purpose of the invention, the technical means adopted by the present invention are as follows: a method for manufacturing a post insulator, comprising the following steps: step ①: providing a hollow insulating tube and two flanges, the inner diameter of the flange being slightly larger than the outer diameter of the hollow insulating tube; step ②: wrapping an umbrella skirt around the hollow insulating tube as a whole; step ③: fixing the two flanges to the two ends of the hollow insulating tube respectively by gluing; step ④: sealing the gap between the flange and the hollow insulating tube with glue to obtain a post insulator.

[0006] Preferably, the flange includes a flange tube and a flange plate, and the flange plate covers one end of the flange tube, so that both ends of the hollow insulating tube are in a closed state to prevent impurities such as water vapor from entering the post insulator. The flange plate is a closed flange plate, which does not require drilling, is easy to process, and has good sealing performance.

[0007] Preferably, the inner wall of the flange cylinder is provided with a plurality of inner annular grooves spaced apart along the axial direction of the flange cylinder, and the flange cylinder is connected and fixed to the hollow insulating tube by filling the inner annular grooves with adhesive.

[0008] Preferably, a flow groove connecting several inner annular grooves is also provided on the inner wall of the flange cylinder. The inner annular grooves and the flow grooves are filled with adhesive to fix the flange cylinder and the hollow insulating tube. The adhesive filled in the inner annular grooves and the flow grooves forms a cross structure after curing, which can further fix the flange cylinder and the hollow insulating tube, and allow the adhesive injected between the flange cylinder and the hollow insulating tube to flow between adjacent inner annular grooves, thereby increasing the injection rate and reducing the risk of bubble retention.

[0009] Preferably, a first sealing groove is provided on the disk surface of the flange disk facing the hollow insulating tube. Before step ③, a first sealing member is arranged in the first sealing groove to prevent a gap from being left between the hollow insulating tube and the flange tube, thereby preventing external water vapor from entering the hollow insulating tube and affecting the seal between the hollow insulating tube and the flange.

[0010] Preferably, the width of the first sealing groove remains unchanged or gradually decreases in the direction approaching the hollow insulating tube, and an adhesive is coated in the first sealing groove and / or on the first sealing member to prevent the first sealing member from falling off.

[0011] Preferably, before step ③, a drying device is provided on the flange surface facing the hollow insulating tube to remove moisture inside the post insulator.

[0012] Preferably, a boss is provided on the disk surface of the flange facing the hollow insulating tube, and before step ③, a drying device is arranged on the boss. The arrangement of the boss avoids the use of a thicker flange, reduces material waste, and lowers manufacturing costs.

[0013] Preferably, in step ③, the two flanges are directly sleeved on both ends of the hollow insulating tube, and the insulating medium in the hollow insulating tube is ambient air.

[0014] Preferably, in step ③, a glue injection hole is provided on the flange, and adhesive is injected into the glue injection hole, and the flange is fixed to both ends of the hollow insulating tube after curing.

[0015] The beneficial effects of the present application are as follows: Different from the prior art, the post insulator of the present application is a hollow structure, that is, the core of the post insulator adopts a hollow insulating tube, and the interior of the hollow insulating tube is ambient air. On the one hand, it avoids the crack defects and interface problems of the post insulator caused by filling solids, thereby affecting the electrical performance of the post insulator; on the other hand, since the ambient air is not filled through the inflation device, the inflation step is eliminated, so there is no need to set an inflation device on its flange, such as an inflation valve, etc., which simplifies the structure and reduces the cost. Compared with the traditional structure, the overall cost is reduced by at least 30%, and the risk points of leakage and process defects are reduced. The post insulator will not produce a negative pressure state during operation, so there is no need to set a monitoring device, and the ambient air does not need to be specially treated (such as drying treatment, etc.), and the overall performance is improved. At the same time, the glue connection process and the glue structure on the flange, including the setting of the inner annular groove and the flow groove, can improve the connection strength between the hollow insulating tube and the flange, improve the reliability and convenience of the assembly process, improve the overall mechanical strength of the post insulator, and further improve the level of automated manufacturing of subsequent products. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a cross-sectional schematic diagram of a post insulator 10 according to an embodiment of the present invention;

[0017] Figure 2 is a cross-sectional schematic diagram of a flange 130 according to an embodiment of the present invention;

[0018] Figure 3 is a cross-sectional schematic diagram of a flange 130 according to another embodiment of the present invention;

[0019] Figure 4 In an implementation scenario Figure 1 A magnified schematic diagram of part A;

[0020] Figure 5 In another implementation scenario Figure 1 Enlarged schematic diagram of part A. DETAILED DESCRIPTION

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

[0022] The "connection" described in the present invention should be understood in a broad sense, unless otherwise clearly specified or limited, and can be directly connected or connected through an intermediate medium. In the description of the present invention, it should be understood that the orientation or position relationship indicated by "upper", "lower", "end", "one end", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0023] like Figure 1 As shown, the post insulator 10 includes a hollow insulating tube 110, an shed 120 and two flanges 130. The shed 120 is entirely covered on the outer periphery of the hollow insulating tube 110, and the two flanges 130 respectively seal and cover the two ends of the hollow insulating tube 110. The hollow insulating tube 110 is a hollow insulating tube formed by pultrusion and winding of glass fiber or aramid fiber impregnated with epoxy resin, or a glass fiber reinforced plastic tube formed by winding and curing of glass fiber impregnated with epoxy resin or pultrusion, or an aromatic fiber tube formed by winding and curing of aramid fiber impregnated with epoxy resin, which is not limited here.

[0024] The shed 120 is made of silicone rubber material, and is coated on the outer periphery of the hollow insulating tube 110 by vacuum injection, thereby improving the outer insulation performance and service life of the post insulator 10. Of course, the shed can also be made of other rubber materials or insulating materials, and the shed can also be fixed on the outer periphery of the hollow insulating tube by molding or other forms, which are not limited here.

[0025] In one application scenario, the flange 130 includes a flange tube 131 and a flange plate 132. The flange tube 131 is a hollow structure along the axial direction, and the flange plate 132 covers one end of the flange tube 131, so that the flange 130 is a structure with one side open and the other side closed. The two open sides of the two flange tubes 131 are respectively sleeved on the two ends of the hollow insulating tube 110, and the flange 130 seals and covers the two ends of the hollow insulating tube 110, that is, the post insulator 10 is in a fully closed state, preventing external impurities such as water vapor from entering the interior of the post insulator 10. The flange plate 132 is closed, does not need to be punched, is easy to process, and has good sealing. At this time, the insulating medium in the hollow insulating tube 110 is ambient air, and the air pressure value in the hollow insulating tube 110 is consistent with the air pressure value of the production environment when the post insulator 10 is prepared. In this way, the post insulator 10 can be directly packaged in the production environment, which is convenient for production, does not require other treatments of the insulating medium, and the insulation performance meets the requirements, and the production efficiency is high and the processing cost is low.

[0026] In one application scenario, compared with traditional solid post insulators and hollow air-filled post insulators, the post insulator 10 that uses ambient air as the internal insulating medium, on the one hand, avoids crack defects and interface problems in the post insulator caused by filling solids, thereby affecting the electrical performance of the post insulator; on the other hand, since the ambient air is not filled through an inflation device, the inflation step is eliminated, the inflation valve structure, inflation device, gas, etc. are omitted, the structure is simplified, and the cost is reduced. The overall cost is reduced by at least 30%, and the risk points of leakage and process defects are reduced. The post insulator will not produce a negative pressure state during operation, so there is no need to set up a monitoring device, and the ambient air does not need to be specially treated (such as drying, etc.), and the overall performance is improved.

[0027] In one application scenario, the relative value of the air pressure in the hollow insulating tube 110 is set to 0 MPa.

[0028] It should be noted that in the present embodiment, the flanges 130 at both ends of the hollow insulating tube 110 are exactly the same. In other embodiments, the flanges at both ends of the hollow insulating tube can also be set to two different flanges. For example, in order to adapt to different connection strengths, the heights of the two flanges are set inconsistently, or in order to adapt to different connection methods, the positions and numbers of the connection holes set on the flange are inconsistent, etc., which are not limited here.

[0029] In addition, in this embodiment, the flange 130 is made of aluminum alloy material, and the flange cylinder 131 and the flange plate 132 are integrally formed, that is, integrally cast, and the structure is relatively simple and easy to manufacture. Of course, in other embodiments, the flange can also be made of steel or other metal materials, and the flange cylinder and the flange plate can also be separately formed and then fixedly connected by welding, which is not limited here.

[0030] Combination Figure 1 and Figure 2As shown, in an application scenario, the hollow insulating tube 110 is fixed to the two flanges 130 by gluing. Specifically, the outer diameter of the hollow insulating tube 110 is slightly smaller than the inner diameter of the flange tube 131. A plurality of inner annular grooves 1311 are arranged on the inner wall of the flange tube 131 at intervals along the axial direction of the flange tube 131, and a plurality of outer annular grooves (not shown) are arranged on the outer wall of the hollow insulating tube 110 at intervals along the axial direction of the hollow insulating tube 110. The size and number of the inner annular grooves 1311 and the outer annular grooves are consistent. After the hollow insulating tube 110 is inserted into the flange tube 131 and one end of the hollow insulating tube 110 abuts against the disk surface of the flange 132 facing the hollow insulating tube 110, the positions of the inner annular grooves 1311 and the outer annular grooves match and correspond. Furthermore, a glue injection hole (not shown) is opened on the flange 130 to fill adhesive between the outer wall of the hollow insulating tube 110 and the flange 130. Specifically, after opening a glue injection hole on the outer wall of the flange tube 131, the adhesive is injected into the glue injection hole to fill the cavity formed by the inner annular groove 1311 and the outer annular groove, so that the hollow insulating tube 110 and the flange 130 are connected and fixed by the adhesive. Among them, the above-mentioned gluing method can adopt horizontal gluing or vertical gluing, as long as the flange 130 and the hollow insulating tube 110 can be fixed by gluing. In another application scenario, the outer wall of the hollow insulating tube 110 and / or the inner wall of the flange tube 131 can be coated with adhesive before gluing.

[0031] Continue reading Figure 2 A flow groove 1312 connecting a plurality of inner annular grooves 1311 is further provided on the inner wall of the flange cylinder 131. After the adhesive is injected into the flange cylinder 131, the flow groove 1312 is filled. After the adhesive in the inner annular grooves 1311 and the flow grooves 1312 is cured, a cross structure is formed, which can further fix the flange cylinder 131 and the hollow insulating tube 110, and can make the adhesive injected between the flange cylinder 131 and the hollow insulating tube 110 flow between adjacent inner annular grooves 1311, thereby improving the injection rate, reducing the risk of bubble retention, and making the flange 130 and the hollow insulating tube 110 more firmly bonded, thereby improving the anti-torsion performance of the post insulator 10 without replacing the adhesive with better bonding performance.

[0032] The number of the flow grooves 1312 may be one or more (for example, two, four, six or even more), and when the number of the flow grooves 1312 is more than one, the plurality of flow grooves 1312 are arranged at intervals along the circumference of the flange cylinder 131. One flow groove 1312 may only connect two adjacent inner annular grooves 1311, or may connect three, four or even all adjacent inner annular grooves 1311, which is not limited here.

[0033] The bottom surface of the flow groove 1312 is a plane or a curved surface. Specifically, when the radial depth and width of the flow groove 1312 relative to the flange 130 are constant, the flow groove 1312 with a plane bottom surface is more complicated to process and has a higher processing cost than the flow groove 1312 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 131 is larger, that is, the flow groove 1312 with a curved bottom surface is easier to process and has a lower processing cost than the flow groove 1312 with a plane bottom surface, but has a slightly lower torsional strength.

[0034] Furthermore, along the axial direction of the post insulator 10, the ratio of the length of the contact portion between the inner wall of the flange tube 131 and the hollow insulating tube 110 to the outer diameter of the hollow insulating tube 110 (i.e., the glue ratio) ranges from 0.2 to 1.0, for example, 0.2, 0.5, 0.8, or 1.0. Specifically, as the glue ratio decreases, the strength of the post insulator 10 will decrease significantly. For example, compared with a glue ratio of 0.2, when the glue ratio decreases to 0.15, the strength of the post insulator 10 will decrease by 20%, and compared with a glue ratio of 1.0, when the glue ratio increases to 1.2, the strength of the post insulator 10 will increase slightly, but the cost will increase significantly. Therefore, setting the glue ratio range to 0.2 to 1.0 can make the post insulator 10 have the advantages of low cost and high strength at the same time.

[0035] Continue to combine Figure 1 and Figure 2 As shown, a first sealing groove 133 is provided on the disk surface of the flange 132 facing the hollow insulating tube 110, and the first sealing groove 133 is located on the inner side of the flange cylinder 131. A first sealing member (not shown) is provided in the first sealing groove 133. Specifically, the first sealing member is provided in the first sealing groove 133. When one end of the hollow insulating tube 110 abuts against the disk surface of the flange 132 facing the hollow insulating tube 110, the first sealing member is sandwiched between the disk surface of the flange 132 and the end surface of the hollow insulating tube 110, and plays a sealing role to prevent a gap from being left between the hollow insulating tube 110 and the flange cylinder 130, and to prevent external water vapor from entering the hollow insulating tube 110, thereby preventing the micro-water value in the hollow insulating tube 110 from being too high.

[0036] In one embodiment, when the hollow insulating tube 110 and the two flanges 130 are fixed by gluing, the inner wall of the flange cylinder 131 is further provided with a second sealing groove 134 adjacent to the flange plate 132, and a second sealing member (not shown) is provided in the second sealing groove 134. Specifically, the second sealing member has a different function from the first sealing member, and the second sealing member is used to prevent the adhesive during the gluing process of the flange 130 and the hollow insulating tube 110 from entering the first sealing groove 133 to corrode the first sealing member and cause the first sealing member to fail, thereby avoiding affecting the seal between the hollow insulating tube 110 and the flange 130.

[0037] It should be noted that, in other embodiments, when the hollow insulating tube 110 and the two flanges 130 are fixed by gluing, the second sealing groove and the second sealing member may not be provided, as long as the flange 130 is inserted into the end of the hollow insulating tube 110, the flange 132 is in full contact with the end of the hollow insulating tube 110, so that the first sealing member is fully compressed, and then the flange 132 and the end of the hollow insulating tube 110 reach a sealed state, and the adhesive in the gluing process cannot enter the contact surface between the flange 132 and the hollow insulating tube 110.

[0038] Combination Figure 1 , Figure 4 and Figure 5 The width of the first sealing groove 133 remains unchanged in the direction close to the hollow insulating tube 110 (eg Figure 4 as shown) or gradually decreases (as shown Figure 5 As shown). Specifically, the first sealing groove 133 whose width remains unchanged in the direction close to the hollow insulating tube 110 is easy to process, but the first seal therein may slide or even fall off. At this time, in order to avoid the relative sliding of the first seal in the first sealing groove 133, the first seal is also bonded and fixed in the first sealing groove 133 by an adhesive, and the adhesive can be resin or silicone, etc.; compared with the first sealing groove 133 whose width remains unchanged in the direction close to the hollow insulating tube 110, the first sealing groove 133 whose width gradually decreases in the direction close to the hollow insulating tube 110 has a more complicated processing process, but it can ensure that the first seal will not fall off easily. Of course, this solution can also use an adhesive to bond and fix the first seal in the first sealing groove to further prevent the first seal from falling off. Among them, the width of the first sealing groove 133 can be linearly reduced in the direction close to the hollow insulating tube 110 (such as Figure 4 It can also be a curve that decreases (not shown), and is not limited here.

[0039] The structure of the second sealing groove 134 is consistent with that of the first sealing groove 133 , and will not be further described herein.

[0040] In another application scenario, combined with Figure 1 and Figure 2 The hollow insulating tube 110 is fixedly connected to the two flanges 130 by interference fit. At this time, the outer diameter of the hollow insulating tube 110 is slightly larger than the inner diameter of the flange tube 131. The hollow insulating tube 110 is pressed into the flange tube 131 by a pressure device, so that the end face of the hollow insulating tube 110 abuts against the disk surface of the flange 132.

[0041] Among them, a first sealing groove 133 is provided on the disk surface of the flange 132 facing the hollow insulating tube 110, and the first sealing groove 133 is located on the inner side of the flange cylinder 131. A first sealing member (not shown) is provided in the first sealing groove 133. Specifically, the first sealing member is provided in the first sealing groove 133. When one end of the hollow insulating tube 110 abuts against the disk surface of the flange 132 facing the hollow insulating tube 110, the first sealing member is sandwiched between the disk surface of the flange 132 and the end surface of the hollow insulating tube 110, and plays a sealing role to prevent a gap from being left between the hollow insulating tube 110 and the flange cylinder 130, and to prevent external water vapor from entering the hollow insulating tube 110, thereby preventing the micro-water value in the hollow insulating tube 110 from being too high.

[0042] Among them, adhesive is coated on the outer wall of the hollow insulating tube 110 and / or the inner wall of the flange tube 131, which further improves the connection strength between the hollow insulating tube 110 and the flange 130, and the adhesive further forms a seal between the tightly combined hollow insulating tube 110 and the flange tube 131, so there is no need to set other sealing structures between the outer wall of the hollow insulating tube 110 and the inner wall of the flange tube 131, that is, there is no need to set the second sealing groove and the second sealing member as mentioned above.

[0043] Specifically, when the hollow insulating tube 110 is fixedly connected to the two flanges 130 by interference fit, the interference fit between the hollow insulating tube 110 and the flange 130 allows the two to be tightly combined, so there is no need to set a second sealing groove. In addition, adhesive can be applied between the hollow insulating tube 110 and the flange tube 131 to further improve the connection strength between the hollow insulating tube 110 and the flange tube 131. At the same time, the adhesive between the hollow insulating tube 110 and the flange tube 131 can form a further seal to ensure the sealing effect.

[0044] Furthermore, when the hollow insulating tube 110 and the two flanges 130 are fixedly connected by interference fit, since the adhesive is directly applied between the hollow insulating tube 110 and the flange tube 131, the inner wall of the flange tube 131 may not need to be provided with the aforementioned inner annular groove and flow groove, so as to further simplify the structure of the flange 130, reduce the process steps, improve production efficiency, and thus reduce costs. Of course, in other embodiments, the inner annular groove and flow groove may still be provided on the inner wall of the flange tube 131, so that the adhesive is fully filled between the hollow insulating tube 110 and the flange tube 131, and the connection strength is improved.

[0045] Continue reading Figure 1A drying device 140 is also provided on the surface of the flange 132 facing the hollow insulating tube 110 to remove moisture inside the post insulator 10. The drying device 140 is located inside the hollow insulating tube 110 and includes a desiccant box 141 and a desiccant 142 placed in the desiccant box 141. The structure is simple and easy to manufacture. Specifically, the desiccant box 141 is cage-shaped, the desiccant box 141 is inverted on the flange 130, and the desiccant is arranged in the desiccant box 141. A connecting ear (not shown) perpendicular to the desiccant box 141 is extended from the opening of the desiccant box 141, and a plurality of connecting holes (not shown) are provided on the connecting ear, which are used to be fixedly connected with the surface of the flange 130 facing the hollow insulating tube 110.

[0046] It should be noted that in other embodiments, the drying device may also be of other structures, for example, the desiccant box is not provided with a connecting ear, and the desiccant box is fixed to the flange by welding, which is not limited here. At the same time, the drying device may also be provided with several on both flanges.

[0047] The desiccant box 141 can be made of a conductive material, such as a metal material. The outer periphery of the desiccant box 141 is provided with through holes of uniform size and uniform distribution to form a shielding cage. By using the shielding cage principle, it is ensured that the desiccant box 141 will not affect the internal electric field of the hollow insulating tube 110. Of course, the desiccant box can also be made of a non-conductive material, such as plastic.

[0048] It should be noted that in other embodiments, the material and shape of the desiccant box are not limited to the present embodiment, and the distribution and size of the through holes are not limited to the present embodiment, as long as they can meet the requirements of the shielding cage. Also, in the axial direction of the post insulator 10, the height of the drying device is set to be less than the height of the flange tube to prevent the metal drying device from affecting the electric field distribution near the flange. Of course, the height of the drying device can also be set to be consistent with the height of the flange tube or slightly higher than the height of the flange tube, as long as the drying device can meet the principle of the shielding cage, that is, it will not affect the electric field inside the hollow insulating tube 110.

[0049] Among them, the desiccant is packed in a cloth bag and wrapped up to prevent the desiccant from scattering.

[0050] In one application scenario, a cloth bag packed with desiccant is fixed in the desiccant box 141. In order to prevent the cloth bag from being bumped or damaged due to external force during the transportation and installation of the post insulator 10, it can be fixed by bundling or other means.

[0051] In another application scenario, the cloth bag is made into a thin cloth bag so that the area where the cloth bag is laid on the disk surface of the flange 132 is as large as possible, so that the desiccant can be spread flat in the cloth bag to achieve the maximum area of ​​contact with the ambient air in the hollow insulating tube 110, effectively absorb moisture, and achieve better drying effect. Preferably, the area where the cloth bag is laid flat is equal to the cross-sectional area of ​​the desiccant box 141. Furthermore, a cross-grid quilting line or a cross-grid quilting line is quilted on the cloth bag to form a plurality of small grids on the cloth bag, and each small grid is filled with desiccant to ensure that the desiccant is evenly filled, and the area in contact with the ambient air in the hollow insulating tube 110 is uniform and stable, so as to better play the drying role, and at the same time avoid the desiccant from accumulating in a certain place in the cloth bag due to the influence of gravity, thereby affecting its adsorption efficiency.

[0052] Combination Figure 1 and Figure 2 As shown, in one application scenario, the thickness of the flange 132 is uniform, and the drying device 140 is fixed on the disk surface of the flange 132 facing the hollow insulating tube 110. The drying device 140 can be fixed on the flange 132 by welding, gluing, screwing, etc. In addition, when the screw connection method is adopted, screw holes need to be set on the disk surface of the flange 132, and drilling holes will affect the mechanical properties of the flange 132 to a certain extent. Therefore, in another application scenario, the thickness of the flange 132 can also be thickened to achieve good mechanical properties.

[0053] Combination Figure 1 and Figure 3 As shown, in another application scenario, a boss 1321 is provided on one side of the flange 132 close to the hollow insulating tube 110, and the drying device 140 is fixedly connected to the boss 1321. It is not necessary to increase the thickness of the flange 132 as a whole, so that the setting of the screw hole 1322 can be avoided from affecting the mechanical properties of the flange 132, and the economic efficiency is more superior. Specifically, the boss 1321 is coaxially arranged with the flange 132, and the boss 1321 extends in the axial direction of the flange 130 in a direction away from the flange 132, and the outer diameter of the disk of the boss 1321 is smaller than the inner diameter of the flange tube 131. Specifically, the outer diameter of the disk of the boss 1321 only needs to be slightly larger than or equal to the outer diameter of the drying device 140 to facilitate the fixing of the drying device 140. In this way, a step surface is formed between the boss 1321 and the disk of the flange 132 facing the hollow insulating tube 110, which can reduce the material of the flange 130 as much as possible, save costs and reduce the weight of the flange 130. At this time, the screw hole 1322 is set on the boss 1321, that is, the drying device 140 is connected and fixed on the boss 1321. Assume that the height of the boss 1321 protruding from the flange 132 toward the disk surface of the hollow insulating tube 110 is H (such as Figure 3As shown), H is consistent with the depth of the screw hole 1322. On the one hand, it prevents the setting of the screw hole 1322 from affecting the mechanical properties of the flange 130, and on the other hand, it can avoid excessive waste of materials, which is economical. At the same time, the surface of the boss 1321 can be circular like the flange 132, or it can be in other shapes, such as square, diamond, etc., and the boss 1321 and the flange 132 can be integrally formed, or they can be fixedly connected by other means, which is not limited here. The screw hole 1322 set on the boss 1321 corresponds to the connecting hole. After the connecting hole and the screw hole 1322 match and correspond, screws are inserted to fix the drying device 140 to the flange 130.

[0054] Furthermore, in one implementation scenario, combined with Figure 1 to Figure 5 , a method for manufacturing the post insulator 10 is provided as follows:

[0055] S101 : providing a hollow insulating tube 110 and two flanges 130 , wherein the inner diameter of the flange 130 is slightly larger than the outer diameter of the hollow insulating tube 110 .

[0056] S102: Wrapping the hollow insulating tube 110 with the shed 120 as a whole.

[0057] S103: The two flanges 130 are fixed to the two ends of the hollow insulating tube 110 by gluing.

[0058] S104 : sealing the gap between the flange 130 and the hollow insulating tube 110 with glue to obtain the post insulator 10 .

[0059] Specifically, in S101, first, when manufacturing the hollow insulating tube 110, a release agent is coated on the surface of the core mold, and the composite material is wound and glue is applied at the same time. When the thickness of the hollow insulating tube 110 reaches a preset value, the winding is stopped, and then the tube is cured and turned to obtain the hollow insulating tube 110.

[0060] It should be noted that the composite material is glass fiber or aramid fiber impregnated with epoxy resin. In this embodiment, the hollow insulating tube 110 is formed by winding the composite material. In other embodiments, the composite material can also be pultruded and wound, or only pultruded, which is not limited here.

[0061] Secondly, the flange 130 is integrally cast by metal materials, which can be aluminum, steel, iron, etc. The flange 130 includes a flange cylinder 131 and a flange plate 132. The flange cylinder 131 and the flange plate 132 can also be formed separately and then fixed by welding to form the flange 130. There is no limitation here. The flange cylinder 131 is hollow along the axial direction, and the flange plate 132 covers one end of the flange cylinder 131, so that the flange 130 is a structure with one side open and the other side closed.

[0062] In addition, a drying device 140 is arranged on the disk surface of the flange 132 of one of the flanges 130 facing the hollow insulating tube 110, and the drying device 140 includes a cage-shaped desiccant box 141 and a desiccant 142 placed in the desiccant box 141. Alternatively, the drying device 140 is arranged on both flanges 130, as long as the interior of the post insulator 10 can be kept dry. The desiccant box 141 can be made of a conductive material and provided with through holes of uniform size and uniform distribution to form a shielding cage. The shielding cage principle is used to ensure that the desiccant box 141 does not affect the internal electric field of the hollow insulating tube 110. Of course, the desiccant box can also be made of a non-conductive material, such as plastic. It is sufficient to complete the setting of the drying device 140 before performing S103, and it is not limited to being completed in S101.

[0063] Among them, a boss 1321 is also provided on the disk surface of the flange 132 facing the hollow insulating tube 110, and the drying device 140 is fixedly connected to the boss 1321. The boss 1321 is coaxially arranged with the flange 132. The boss 1321 extends along the axial direction of the flange 130 in a direction away from the flange 132, and the outer diameter of the disk surface of the boss 1321 is smaller than the inner diameter of the flange tube 131. In this way, a step surface is formed between the boss 1321 and the disk surface of the flange 132 facing the hollow insulating tube 110.

[0064] Finally, the inner diameter of the flange 130 is set to be slightly larger than the outer diameter of the hollow insulating tube 110, so as to facilitate fixing the hollow insulating tube 110 and the flange 130 by gluing. Specifically, a plurality of inner annular grooves 1311 are arranged at intervals along the axial direction of the flange cylinder 131 on the inner wall of the flange cylinder 131, and a plurality of outer annular grooves (not shown) are arranged at intervals along the axial direction of the hollow insulating tube 110 on the outer wall of the hollow insulating tube 110. The size and number of the inner annular grooves 1311 and the outer annular grooves are consistent. After the hollow insulating tube 110 is inserted into the flange cylinder 131 and one end of the hollow insulating tube 110 abuts against the disk surface of the flange disk 132 facing the hollow insulating tube 110, the positions of the inner annular grooves 1311 and the outer annular grooves match and correspond.

[0065] Furthermore, a flow groove 1312 is provided on the inner wall of the flange cylinder 131 to connect with a plurality of inner annular grooves 1311. The number of the flow grooves 1312 may be one or more (for example, two, four, six or even more), and when the number of the flow grooves 1312 is more than one, the plurality of flow grooves 1312 are arranged at intervals along the circumference of the flange cylinder 131. One flow groove 1312 may only connect with two adjacent inner annular grooves 1311, or may connect with three, four or even all adjacent inner annular grooves 1311, which is not limited here. The bottom surface of the flow groove 1312 is a plane or a curved surface.

[0066] At the same time, the ratio of the length of the contact portion between the inner wall of the flange tube 131 and the hollow insulating tube 110 to the outer diameter of the hollow insulating tube 110 (ie, the gluing ratio) is set in the range of 0.2 to 1.0.

[0067] Furthermore, a first sealing groove 133 is provided on the surface of the flange 132 facing the hollow insulating tube 110, and a first sealing member (not shown) is provided in the first sealing groove 133; a second sealing groove 134 adjacent to the flange 132 is provided on the inner wall of the flange cylinder 131, and a second sealing member (not shown) is provided in the second sealing groove 134. At the same time, the width of the first sealing groove 133 and / or the second sealing groove 134 remains unchanged in the direction close to the hollow insulating tube 110 (such as Figure 3 as shown) or gradually decreases (as shown Figure 4 As shown). Before performing S203, the first sealing member and the second sealing member may be provided to ensure sealing, and the steps are not limited to being completed in S201.

[0068] It should be noted that in this embodiment, a second sealing groove 134 and a second sealing member are provided on the inner wall of the flange tube 131. In other embodiments, the second sealing groove and the second sealing member may not be provided. As long as the flange is inserted into the end of the hollow insulating tube, the flange plate is in full contact with the end of the hollow insulating tube, and the adhesive in the gluing process cannot enter the contact surface between the flange plate and the hollow insulating tube.

[0069] Furthermore, in S102 , an injection molding machine is provided, and after the coupling agent is coated on the outside of the hollow insulating tube 110 , the tube is placed in a mold of the injection molding machine, and the shed 120 is integrally injected around the outer periphery of the hollow insulating tube 110 by adding silicone rubber raw materials.

[0070] It should be noted that the umbrella skirt 120 of the present embodiment is fixed to the outer periphery of the hollow insulating tube 110 by injection. In other embodiments, the umbrella skirt can also be fixed to the outer peripheral surface of the hollow insulating tube 110 by molding or other forms. The umbrella skirt can also be made of other rubber materials, which is not limited here.

[0071] In S103, after a glue injection hole (not shown) is opened on the outer wall of the flange tube 131 of the flange 130 provided above, adhesive is injected into the gap between the inner wall of the flange tube 131 and the outer wall of the hollow insulating tube 110 through the glue injection hole, so that the adhesive fills the cavity formed by the inner annular groove 1311 and the outer annular groove, and after heating and curing and cooling, the hollow insulating tube 110 and the flange 130 are connected and fixed by the adhesive. Among them, the above-mentioned gluing method can be horizontal gluing or vertical gluing, as long as the flange 130 and the hollow insulating tube 110 can be fixed by gluing.

[0072] In S104, the end of the flange tube 131 away from the flange plate 132 is further provided with a sealing groove 1313. After the flange tube 131 is sleeved on the end of the hollow insulating tube 110, a gap (not shown) is formed between the flange tube 131 and the hollow insulating tube 110. A third sealing member (not shown) is placed in the gap and fixed by a sealing agent. In this way, the hollow insulating tube 110 and the flange 130 are sealed by three layers, that is, the first sealing member, the second sealing member, and the third sealing member form a three-layer sealing structure, which further improves the overall sealing performance of the post insulator 10 and prevents external water vapor from entering the interior of the post insulator 10.

[0073] The sealant may be room temperature vulcanized silicone rubber, or other materials that can be cured at room temperature, as long as the third sealing member can be sealed reliably.

[0074] The beneficial effects of the present application are as follows: different from the prior art, the post insulator 10 of the present application is a hollow structure, that is, the core of the post insulator 10 adopts a hollow insulating tube 110, and the interior of the hollow insulating tube 110 is ambient air. On the one hand, it avoids the occurrence of crack defects and interface problems in the post insulator 10 caused by filling solids, thereby affecting the electrical performance of the post insulator 10; on the other hand, since the ambient air is not filled through an inflation device, the inflation step is eliminated, and therefore, there is no need to set an inflation device on its flange 130, such as an inflation valve, etc., which simplifies the structure and reduces the cost. Compared with the traditional structure, the overall cost is reduced by at least 30%, and at the same time, the risk points of leakage and process defects are reduced. The post insulator 10 will not generate a negative pressure state during operation, so there is no need to set a monitoring device, and the ambient air does not need to be specially treated (such as drying treatment, etc.), and the overall performance is improved. At the same time, compared with the prior art, the gluing connection process and the gluing structure on the flange 130, including the setting of the inner annular groove 1311 and the flow groove 1312, can improve the connection strength between the hollow insulating tube 110 and the flange 130, improve the reliability and convenience of the assembly process, improve the overall mechanical strength of the post insulator 10, and further improve the level of automated manufacturing of subsequent products.

[0075] The technical content and technical features of the present invention have been disclosed above, but it is understood that under the creative ideas of the present invention, those skilled in the art can make various changes and improvements to the above structures and materials, including combinations of technical features disclosed or claimed separately herein, and obviously including other combinations of these features. These variations and / or combinations all fall within the technical field involved in the present invention and fall within the protection scope of the claims of the present invention.

Claims

1. A method for manufacturing a post insulator, characterized in that: The steps include: Step ①: providing a hollow insulating tube and two flanges, wherein the inner diameter of the flange is slightly larger than the outer diameter of the hollow insulating tube, the flange comprises a flange tube and a flange plate, the flange plate covers one end of the flange tube, a first sealing groove is provided on the disk surface of the flange plate facing the hollow insulating tube, the width of the first sealing groove gradually decreases in the direction approaching the hollow insulating tube, and a second sealing groove adjacent to the flange plate is further provided on the inner wall of the flange tube; Step ②: Wrapping the hollow insulating tube with an umbrella skirt as a whole; Step ③: The two flanges are respectively fixed to the two ends of the hollow insulating tube by gluing, wherein the insulating medium in the hollow insulating tube is ambient air, and the air pressure value in the hollow insulating tube is consistent with the air pressure value of the production environment when preparing the post insulator, so that the relative value of the air pressure in the hollow insulating tube is 0MPa; before this step, a first seal is arranged in the first sealing groove, and a second seal is arranged in the second sealing groove; and a plurality of inner annular grooves and a flow groove connecting the plurality of inner annular grooves are arranged on the inner wall of the flange tube along the axial direction of the flange tube, and along the axial direction of the post insulator, the ratio of the length of the contact portion between the inner wall of the flange tube and the hollow insulating tube to the outer diameter of the hollow insulating tube is set in the range of 0.2 to 1.0, and the inner annular groove and the flow groove are filled with adhesive to fix the flange tube and the hollow insulating tube; Step ④: seal the gap between the flange and the hollow insulating tube with glue to obtain the post insulator.

2. The method for manufacturing a post insulator according to claim 1, characterized in that: The width of the first sealing groove remains unchanged or gradually decreases in a direction approaching the hollow insulating tube, and an adhesive is coated in the first sealing groove and / or on the first sealing member.

3. The method for manufacturing a post insulator according to claim 1, characterized in that: Before step ③, a drying device is also provided on the disk surface of the flange disk facing the hollow insulating tube.

4. The method for manufacturing a post insulator according to claim 1, wherein: A boss is provided on the disk surface of the flange disk facing the hollow insulating tube, and a drying device is provided on the boss before step ③.

5. The method for manufacturing a post insulator according to claim 1, wherein: In step ③, a glue injection hole is provided on the flange, and adhesive is injected into the glue injection hole, and the flange is fixed to the two ends of the hollow insulating tube after curing.

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