CN115346741A - Manufacturing method of post insulator - Google Patents

Abstract

The invention discloses a method for manufacturing a post insulator, which comprises the following steps: step (1): providing a hollow insulating pipe and two flanges, wherein the inner diameter of each flange is slightly smaller than the outer diameter of the hollow insulating pipe; step (2): the hollow insulating pipe is externally and integrally coated with an umbrella skirt; and (3): the two flanges are respectively fixed with the two ends of the hollow insulating pipe in a press fit manner through interference fit; and (4): and sealing the gap between the flange and the hollow insulating pipe with glue to obtain the post insulator. The method for manufacturing the post insulator is simple and convenient, convenient to manufacture, low in manufacturing cost and high in production efficiency, and the connection strength of all parts of the post insulator is improved.

Description

Manufacturing method of post insulator

Technical Field

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

Background

The existing industry inner post insulator comprises the following technical routes: (1) coating room temperature vulcanized silicone Rubber (RTV) paint on the porcelain insulator; (2) the porcelain core composite post insulator, namely the umbrella skirt adopts silicon rubber, and the core rod adopts a porcelain insulator; (3) the solid composite post insulator adopts a composite material solid core body; (4) filling a solid insulating medium in the hollow composite insulator; (5) the hollow composite insulator is filled with pressure gas, and the outer insulating umbrella covers of the last three types are all made of silicon rubber materials.

In order to improve the mechanical properties of the post insulator, it is necessary to provide a method for manufacturing the post insulator to reinforce the connection between the components of the post insulator.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a manufacturing method of a post insulator, which has the advantages of simple manufacturing process, low manufacturing cost and high production efficiency, and improves the connection strength between all parts of the post insulator.

In order to achieve the purpose, the technical means adopted by the invention are as follows: a method for manufacturing a post insulator comprises the following steps: step (1): providing a hollow insulating pipe and two flanges, wherein the inner diameter of each flange is slightly smaller than the outer diameter of the hollow insulating pipe; step (2): the hollow insulating pipe is externally and integrally coated with an umbrella skirt; and (3): the two flanges are respectively fixed with the two ends of the hollow insulating pipe in a press fit manner through interference fit; and (4): and sealing the gap between the flange and the hollow insulating pipe with glue to obtain the post insulator.

Preferably, the flange comprises a flange cylinder and a flange disc, and one end of the flange cylinder is sealed by the flange disc, so that two ends of the hollow insulating pipe are in a closed state, and impurities such as water vapor and the like are prevented from entering the inside of the post insulator. The flange plate is a closed flange plate, does not need to be punched, and is convenient to process and good in sealing property.

Preferably, the flange plate is provided with a first sealing groove on the disc surface facing the hollow insulating tube, and before the step (3), a first sealing element is arranged in the first sealing groove to prevent a gap from being left between the hollow insulating tube and the flange cylinder, so that external water vapor is prevented from entering the hollow insulating tube, and the sealing between the hollow insulating tube and the flange is influenced.

Preferably, the width of the first sealing groove is kept constant or gradually reduced in the direction close to the hollow insulating pipe, and an adhesive is coated in the first sealing groove and/or on the first sealing element to prevent the first sealing element from falling.

Preferably, before the step (3), a drying device is arranged on the disc surface of the flange plate facing the hollow insulating tube and used for removing moisture in the post insulator, the drying device comprises a cage-shaped drying agent box and drying agents arranged in the drying agent box, and through holes are formed in the periphery of the drying agent box and used for absorbing moisture.

Preferably, the desiccant is placed directly in the cage desiccant container and the drying means is fixed to the flange.

Preferably, the desiccant is packaged in a cloth bag.

Preferably, before the step (3), an adhesive is coated on the outer wall of the hollow insulating pipe and/or the inner wall of the flange cylinder.

Preferably, in the step (3), the two flanges are directly sleeved at two ends of the hollow insulating pipe, and the insulating medium in the hollow insulating pipe is ambient air.

Preferably, after the step (3), heating, solidifying and cooling the area where the hollow insulating pipe and the flange are fixed in a press-fitting manner.

The beneficial effect of this application is: different from the situation of the prior art, the post insulator is of a hollow structure, namely, a core body of the post insulator is a hollow insulating pipe, and ambient air is filled in the hollow insulating pipe, so that on one hand, the problems of crack defects and interfaces of the post insulator caused by solid filling are avoided, and the electrical performance of the post insulator is further influenced; on the other hand, because ambient air is not filled through the aerating device, then the step of aerifing has been removed from, therefore also need not to set up aerating device on its flange, for example inflation valve etc. simplified the structure, the cost is reduced, compare in traditional structure, the overall cost has reduced 30% at least, reduced gas leakage, the risk point of technology defect simultaneously, the post insulator can not produce negative pressure state in the operation process, consequently need not to set up monitoring devices, and ambient air also need not to carry out special treatment (for example drying process etc.), the wholeness can be promoted. Meanwhile, compared with the prior art, the interference fit connection process can improve the connection strength between the hollow insulating pipe 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 automatic manufacturing level of subsequent products.

Drawings

Fig. 1 is a schematic cross-sectional view of a post insulator 10 according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a flange 130 according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a flange 130 according to another embodiment of the present invention;

FIG. 4 is an enlarged schematic view of portion A of FIG. 1 in one implementation scenario;

fig. 5 is an enlarged schematic view of a portion a of fig. 1 in another implementation scenario.

Detailed Description

As required, detailed embodiments of the present invention are disclosed herein. However, it is to be understood that the disclosed embodiments are merely exemplary of the invention, which may be embodied in various forms. Therefore, specific details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed manner, including employing various features disclosed herein in combination with features that may not be explicitly disclosed herein.

The term "connected", as used herein, unless otherwise expressly specified or limited, is to be construed broadly, as meaning either directly or through an intermediate connection. In the description of the present invention, it is to be understood that the directions or positional relationships indicated by "upper", "lower", "end", "one end", etc. are based on the directions or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific direction, be constructed in a specific direction and operate, and thus, should not be construed as limiting the present invention.

As shown in fig. 1, the post insulator 10 includes a hollow insulating tube 110, a shed 120 and two flanges 130, the shed 120 covers the periphery of the hollow insulating tube 110, and the two flanges 130 respectively seal and cover two ends of the hollow insulating tube 110. The hollow insulating tube 110 is a hollow insulating tube formed by pultrusion and winding glass fiber or aramid fiber impregnated epoxy resin, a glass steel tube formed by pultrusion and curing glass fiber impregnated epoxy resin, or an aramid fiber tube formed by pultrusion and curing aramid fiber impregnated epoxy resin, and is not limited herein.

The umbrella skirt 120 is made of a silicon rubber material and is wrapped around the hollow insulating tube 110 in an integral vacuum injection manner, so that the external insulating performance and the service life of the post insulator 10 are integrally improved. Of course, the umbrella skirt may also be made of other rubber materials or insulating materials, and the umbrella skirt may also be fixed on the outer circumferential surface of the hollow insulating tube in other forms such as die pressing, and the like, which is not limited herein.

In an application scenario, the flange 130 includes a flange barrel 131 and a flange 132, the flange barrel 131 is a hollow structure along an axial direction, and the flange 132 covers one end of the flange barrel 131, so that the flange 130 is a structure with one side open and the other side closed. The open sides of the two flange cylinders 131 are respectively sleeved at two ends of the hollow insulating tube 110, and the flanges 130 are sealed and cover the two ends of the hollow insulating tube 110, that is, the post insulator 10 is in a fully closed state, so as to prevent external water vapor and other impurities from entering the interior of the post insulator 10. The flange plate 132 is closed, does not need to be punched, is convenient to process and has good sealing property. 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 production ambient air pressure value in the process of preparing the post insulator 10. Therefore, the post insulator 10 can be directly packaged in a production environment, the production is convenient, other treatments on insulating media are not needed, the insulating property meets the requirement, the production efficiency is high, and the processing cost is low.

In an application scene, compared with the traditional solid post insulator and the traditional hollow inflatable post insulator, the post insulator 10 with the ambient air as the internal insulation medium is adopted, so that on one hand, the problems of crack defects and interfaces of the post insulator caused by solid filling are avoided, and the electrical performance of the post insulator is influenced; on the other hand, because the ambient air is not filled through the air charging device, the air charging step is omitted, an air charging valve structure, the air charging device, air and the like are omitted, the structure is simplified, the cost is reduced, the overall cost is reduced by at least 30%, air leakage and process defects are reduced, a negative pressure state cannot be generated in the operation process of the post insulator, a monitoring device does not need to be arranged, the ambient air does not need to be specially treated (such as drying treatment and the like), and the overall performance is improved.

In an application scenario, the relative value of the air pressure inside the hollow insulating tube 110 is set to 0MPa.

It should be noted that, in this embodiment, the flanges 130 at both ends of the hollow insulating tube 110 are completely the same, and in other embodiments, the flanges at both ends of the hollow insulating tube may be provided as two different flanges, for example, in order to adapt to different connection strengths, the heights of the two flanges are not set to be the same, or in order to adapt to different connection modes, the positions and the number of the connection holes provided on the flange are not the same, and the like, which is not limited herein.

And, in this embodiment, the flange 130 is made of an aluminum alloy material, and the flange cylinder 131 and the flange 132 are integrally formed, that is, formed by integral casting, and thus the structure is relatively simple and easy to manufacture. Of course, in other embodiments, the flange may be made of steel or other metal materials, and the flange cylinder and the flange may also be formed separately and then fixedly connected by welding, which is not limited herein.

In an application scenario, as shown in fig. 1 and 2, the hollow insulating tube 110 and the two flanges 130 are fixed by glue. Specifically, the outer diameter of the hollow insulating tube 110 is slightly smaller than the inner diameter of the flange cylinder 131. A plurality of inner annular grooves 1311 are axially arranged on the inner wall of the flange barrel 131 at intervals along the flange barrel 131, a plurality of outer annular grooves (not shown) are axially arranged on the outer wall of the hollow insulating tube 110 at intervals along the hollow insulating tube 110, the inner annular grooves 1311 and the outer annular grooves are uniform in size and number, the hollow insulating tube 110 is sleeved in the flange barrel 131, and when one end of the hollow insulating tube 110 abuts against the disc surface of the flange plate 132 facing the hollow insulating tube 110, the inner annular grooves 1311 correspond to the outer annular grooves in position matching. Furthermore, a glue injection hole (not shown) is formed in the flange 130, and an adhesive is filled between the outer wall of the hollow insulating tube 110 and the flange 130, specifically, after the glue injection hole is formed in the outer wall of the flange cylinder 131, the adhesive is injected into the glue injection hole, so that the adhesive is filled in a cavity formed by the inner annular groove 1311 and the outer annular groove, and the hollow insulating tube 110 and the flange 130 are connected and fixed through the adhesive. 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 cylinder 131 may be coated with an adhesive and then glued.

Continuing to refer to fig. 2, a circulation groove 1312 communicated with the inner annular grooves 1311 is further formed in the inner wall of the flange cylinder 131, the circulation groove 1312 is filled after the adhesive is injected into the flange cylinder 131, the inner annular grooves 1311 and the circulation groove 1312 are solidified to form a cross structure, the flange cylinder 131 and the hollow insulating pipe 110 can be further fixedly connected, the adhesive injected between the flange cylinder 131 and the hollow insulating pipe 110 can circulate between the adjacent inner annular grooves 1311, the adhesive injection rate can be increased, the risk of air bubble retention is reduced, the flange 130 and the hollow insulating pipe 110 are combined more firmly, and the torsion resistance of the post insulator 10 is improved on the premise that the adhesive with better bonding property is not replaced.

Here, the number of the flow grooves 1312 may be one, or may be plural (for example, two, four, six, or even more), and when the number of the flow grooves 1312 is plural, the plural flow grooves 1312 are provided at intervals in the circumferential direction of the flange cylinder 131. One flow groove 1312 may communicate with only two adjacent inner annular grooves 1311, or may communicate with three, four or even all adjacent inner annular grooves 1311, which is not limited herein.

The bottom surface of the flow channel 1312 is a flat surface or a curved surface. Specifically, when the radial depth and width of the flow channel 1312 relative to the flange 130 are fixed, the flow channel 1312 with the flat bottom surface has more complicated and expensive processing, but higher torsional strength than the flow channel 1312 with the curved bottom surface, because the contact area between the adhesive in the flat channel and the inner wall of the flange cylinder 131 is larger, that is, the flow channel 1312 with the curved bottom surface has more convenient processing and lower processing cost than the flow channel 1312 with the flat bottom surface, but the torsional strength is slightly lower.

Further, the ratio (i.e., the cementing ratio) of the length of the portion of the inner wall of the flange cylinder 131 contacting the hollow insulating tube 110 to the outer diameter of the hollow insulating tube 110 in the axial direction of the post insulator 10 is in the range of 0.2 to 1.0, for example, 0.2, 0.5, 0.8, 1.0, or the like. Specifically, as the binding ratio decreases, the strength of the post insulator 10 decreases significantly, for example, when the binding ratio decreases to 0.15, the strength of the post insulator 10 decreases by 20% compared to 0.2, and when the binding ratio increases to 1.2, the cost of the post insulator 10 increases significantly compared to 1.0, so that the post insulator 10 can have advantages such as low cost and high strength at the same time by setting the binding ratio in the range of 0.2 to 1.0.

With reference to fig. 1 and fig. 2, a first sealing groove 133 is disposed on a disk surface of the flange 132 facing the hollow insulating tube 110, the first sealing groove 133 is located inside the flange 131, and a first sealing element (not shown) is disposed inside the first sealing groove 133. Specifically, the first sealing element is disposed in the first sealing groove 133, and when one end of the hollow insulating tube 110 abuts against the disk face of the flange 132 facing the hollow insulating tube 110, the first sealing element is clamped between the disk face of the flange 132 and the end face of the hollow insulating tube 110, so as to perform a sealing function, prevent a gap from being left between the hollow insulating tube 110 and the flange barrel 130, prevent external water vapor from entering the hollow insulating tube 110, and prevent a micro water value in the hollow insulating tube 110 from being too high.

In one embodiment, when the hollow insulating tube 110 and the two flanges 130 are fixed by gluing, the inner wall of the flange barrel 131 is further provided with a second sealing groove 134 adjacent to the flange 132, and a second sealing member (not shown) is provided in the second sealing groove 134. Specifically, the second sealing element has a different function from the first sealing element, and the second sealing element is used to prevent an adhesive in the process of cementing the flange 130 and the hollow insulating tube 110 from entering the first sealing groove 133 to corrode the first sealing element, so that the first sealing element is prevented from failing, and the sealing between the hollow insulating tube 110 and the flange 130 is prevented from being affected.

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 element may not be provided, as long as the flange 130 is sleeved on the end of the hollow insulating tube 110, the flange 132 is in sufficient contact with the end of the hollow insulating tube 110, so that the first sealing element is sufficiently compressed, and then the flange 132 and the end of the hollow insulating tube 110 are in a sealed state, and an adhesive in the gluing process cannot enter a contact surface between the flange 132 and the hollow insulating tube 110.

Referring to fig. 1, 4 and 5, the width of the first sealing groove 133 is constant (as shown in fig. 4) or gradually decreases (as shown in fig. 5) in a direction approaching the hollow insulating tube 110. Specifically, the first sealing groove 133, the width of which remains unchanged in the direction approaching the hollow insulating tube 110, is convenient to machine, but the first sealing element therein may slide or even fall off, and in this case, in order to avoid the first sealing element from sliding relatively in the first sealing groove 133, the first sealing element is further fixed in the first sealing groove 133 by an adhesive, and the adhesive may be resin or silica gel; compared with the first sealing groove 133 with the width being unchanged in the direction close to the hollow insulating tube 110, the first sealing groove 133 with the width gradually decreasing in the direction close to the hollow insulating tube 110 can ensure that the first sealing element cannot easily fall off although the processing process is more complicated, and certainly, the first sealing element can be bonded and fixed in the first sealing groove through the adhesive, so that the first sealing element is further prevented from falling off. The width of the first sealing groove 133 may be linearly smaller in a direction approaching the hollow insulating tube 110 (as shown in fig. 4), or may be curved smaller (not shown), which is not limited herein.

The second sealing groove 134 has the same structure as the first sealing groove 133, and will not be described herein.

In another application scenario, referring to fig. 1 and fig. 2, the hollow insulating tube 110 is fixedly connected to the two flanges 130 through interference fit, at this time, the outer diameter of the hollow insulating tube 110 is slightly larger than the inner diameter of the flange barrel 131, and the hollow insulating tube 110 is press-fitted into the flange barrel 131 through a pressure device, so that the end surface of the hollow insulating tube 110 abuts against the disk surface of the flange 132.

A first sealing groove 133 is disposed on a disk surface of the flange 132 facing the hollow insulating tube 110, the first sealing groove 133 is located inside the flange barrel 131, and a first sealing member (not shown) is disposed in the first sealing groove 133. Specifically, the first sealing element is disposed in the first sealing groove 133, and 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 element is clamped between the disk surface of the flange 132 and the end surface of the hollow insulating tube 110, so as to perform a sealing function, prevent a gap from being left between the hollow insulating tube 110 and the flange barrel 130, and 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.

The adhesive is coated on the outer wall of the hollow insulating tube 110 and/or the inner wall of the flange barrel 131, so that the connection strength between the hollow insulating tube 110 and the flange 130 is further improved, and the adhesive further seals the tightly combined hollow insulating tube 110 and the flange barrel 131, so that other sealing structures do not need to be arranged between the outer wall of the hollow insulating tube 110 and the inner wall of the flange barrel 131, that is, the second sealing groove and the second sealing element do not need to be arranged.

Specifically, when hollow insulating tube 110 and two flanges 130 pass through interference fit fixed connection, hollow insulating tube 110 and flange 130 complex interference magnitude make between the two can combine closely, then need not to set up the second seal groove again, can also paint the gluing agent between hollow insulating tube 110 and a flange section of thick bamboo 131 in addition, further improve the joint strength between hollow insulating tube 110 and a flange section of thick bamboo 131, gluing agent between hollow insulating tube 110 and a flange section of thick bamboo 131 can form further sealedly simultaneously, guarantees sealed effect.

Further, when the hollow insulating tube 110 is fixedly connected with the two flanges 130 through interference fit, the adhesive is directly coated between the hollow insulating tube 110 and the flange barrel 131, and the inner wall of the flange barrel 131 does not need to be provided with the inner annular groove and the circulation groove, so that the structure of the flange 130 is further simplified, the process steps are reduced, the production efficiency is improved, and the cost is reduced. Of course, in other embodiments, the inner wall of the flange cylinder 131 may still be provided with an inner annular groove and a flow channel, so that the adhesive is fully filled between the hollow insulating tube 110 and the flange cylinder 131, thereby improving the connection strength.

With continued reference to fig. 1, the disk surface of the flange 132 facing the hollow insulating tube 110 is further provided with a drying device 140 for removing moisture inside the post insulator 10, and the drying device 140 is located inside the hollow insulating tube 110 and includes a drying agent box 141 and a drying agent 142 disposed inside the drying agent box 141, which is simple in structure and convenient to manufacture. Specifically, the desiccant container 141 has a cage shape, the desiccant container 141 is reversely fastened to the flange 130, and the desiccant is disposed in the desiccant container 141. A connecting lug (not shown) perpendicular to the drying agent box 141 extends from the opening of the drying agent box 141, and a plurality of connecting holes (not shown) are formed in the connecting lug and are used for being fixedly connected with the disk surface of the flange 130 facing the hollow insulating tube 110.

It should be noted that, in other embodiments, the drying device may also have other structures, for example, the drying agent box is not provided with a connecting lug, and the drying agent box is fixed on the flange by welding, which is not limited herein. Simultaneously, drying device also can all set up a plurality of on two flanges.

The drying agent box 141 may be made of a conductive material, such as a metal material. And the through holes with the same size and uniform distribution are arranged on the periphery of the drying agent box 141 to form a shielding cage, and the principle of the shielding cage is utilized to ensure that the drying agent box 141 does not influence the internal electric field of the hollow insulating tube 110. Of course, the desiccant cartridge may also be made of a non-conductive material, such as plastic.

In other embodiments, the material and shape of the drying agent box are not limited to this embodiment, and the distribution and size of the through holes are not limited to this embodiment as long as the requirements of the shielding cage can be satisfied. And, in the axial of the post insulator 10, the height of the drying device is set to be less than that of the flange cylinder, so that the drying device made of metal is prevented from influencing the electric field distribution near the flange. Of course, the height of the drying device may also be set to be the same as the height of the flange cylinder or slightly higher than the height of the flange cylinder, as long as the drying device can satisfy the shielding cage principle, i.e. the electric field inside the hollow insulating tube 110 is not affected.

Wherein, the desiccant is packed in the cloth bag and bound up to prevent the desiccant from scattering.

In an application scenario, the cloth bag packed with the drying agent is fixed in the drying agent box 141, and in order to avoid the cloth bag from being knocked and damaged due to external force during transportation and installation of the post insulator 10, the cloth bag can be fixed by means of bundling and the like.

In another application scenario, the cloth bag is made into a thin cloth bag, so that the area of the cloth bag laid on the disc surface of the flange 132 is as large as possible, and further, the drying agent can be laid in the cloth bag to be in contact with the ambient air in the hollow insulating tube 110 in the largest area, so that the drying agent can effectively absorb moisture, and the drying effect is better. Preferably, the area of the flat spread of the cloth bag is equal to the cross-sectional area of the drying agent box 141. Further, sew with long stitches or the sew with long stitches of the criss-cross check of system cross on the sack etc. make and form a plurality of little check on the sack, all pack in every little check and have the drier, guarantee that the drier evenly fills, it is stable with the area homogeneous of the interior ambient air contact of hollow insulating tube 110, exert drying action better, avoid the drier simultaneously because gravity influences, pile up certain department in the sack and influence its adsorption efficiency.

Referring to fig. 1 and 2, in an application scenario, the flange 132 has an equal thickness, the drying device 140 is fixed on the surface of the flange 132 facing the hollow insulating tube 110, and the drying device 140 can be fixed on the flange 132 by welding, gluing, screwing, or the like. In addition, when adopting the spiro union mode, need set up the screw hole on the quotation of ring flange 132, punch and can influence the mechanical properties of ring flange 132 to a certain extent, consequently in another application scenario, also can thicken the thickness of ring flange 132 to realize good mechanical properties.

With reference to fig. 1 and fig. 3, in another application scenario, a boss 1321 is disposed 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, so that the mechanical property of the flange 132 can be prevented from being affected by the screw holes 1322 without increasing the thickness of the flange 132 as a whole, and the economy is more excellent. Specifically, the boss 1321 is disposed coaxially with the flange 132, the boss 1321 extends in the axial direction of the flange 130 in the direction away from the flange 132, and the disk outer diameter of the boss 1321 is smaller than the inner diameter of the flange barrel 131, specifically, the disk outer diameter of the boss 1321 only needs to be slightly larger than or equal to the outer diameter of the drying device 140 so as to fix the drying device 140, so that a step surface is formed between the boss 1321 and the disk surface of the flange 132 facing the hollow insulating tube 110, the material consumption of the flange 130 is reduced as much as possible, the cost can be saved, and the weight of the flange 130 can be reduced. At this time, the screw hole 1322 is provided in the boss 1321, that is, the drying device 140 is connected and fixed to the boss 1321. Assuming that the height of the protruding flange 132 of the boss 1321 toward the disk surface of the hollow insulating tube 110 is H (as shown in fig. 3), the depth of H is consistent with that of the screw holes 1322, so that the mechanical property of the flange 130 is prevented from being affected by the arrangement of the screw holes 1322, excessive material waste can be avoided, and the economical efficiency is good. Meanwhile, the surface of the boss 1321 may be circular as the flange 132, or may be in other shapes, such as square, diamond, etc., and the boss 1321 and the flange 132 may be integrally formed, or may be fixedly connected by other manners, which is not limited herein. The screw holes 1322 formed in the boss 1321 correspond to the coupling holes, and after the coupling holes are matched with the screw holes 1322, screws are inserted to fixedly couple the drying device 140 to the flange 130.

Further, in one implementation scenario, with reference to fig. 1 to 5, a method for manufacturing the post insulator 10 is provided as follows:

s101: a hollow insulating tube 110 and two flanges 130 are provided, the inner diameter of the flanges 130 being slightly smaller than the outer diameter of the hollow insulating tube 110.

S102: the hollow insulating tube 110 is integrally covered with an umbrella skirt 120.

S103: the two flanges 130 are respectively press-fitted and fixed with the two ends of the hollow insulating tube 110 by interference fit.

S104: and sealing the gap between the flange 130 and the hollow insulating tube 110 to obtain the post insulator 10.

Specifically, in S101, first, when the hollow insulating tube 110 is manufactured, a release agent is coated on the surface of the core mold, a composite material is wound, glue is sprayed, the winding is stopped when the thickness of the hollow insulating tube 110 reaches a preset value, and then, curing and turning are performed to obtain the hollow insulating tube 110.

The composite material is prepared by impregnating glass fiber or aramid fiber with epoxy resin. In the present embodiment, the hollow insulation tube 110 is formed by winding a composite material, but in other embodiments, it may be formed by pultrusion winding a composite material, or by pultrusion alone, which is not limited herein.

The flange 130 is formed by integrally casting a metal material, which may be aluminum, steel, iron, or the like, and the flange 130 includes a flange cylinder 131 and a flange 132, or the flange cylinder 131 and the flange 132 are formed separately and then fixed by welding to form the flange 130, which is not limited herein. The flange tube 131 is hollow along the axial direction, and the flange 132 covers one end of the flange tube 131, so that the flange 130 is open on one side and closed on the other side.

A first seal groove 133 is formed in a disk surface of the flange 132 facing the hollow insulating tube 110, and a first seal (not shown) is provided in the first seal groove 133. Meanwhile, the width of the first seal groove 133 is maintained constant (as shown in fig. 3) or gradually decreased (as shown in fig. 4) in a direction approaching the hollow insulating tube 110. The setting of the first sealing member may be completed before S103 is performed, so that sealing is ensured, and is not limited to being completed in S101.

It should be noted that, in other implementations, the inner wall of the flange barrel 131 may also be provided with the second sealing groove 134 and the second sealing member adjacent to the flange 132, and the inner wall of the flange barrel 131 may also be provided with the plurality of inner annular grooves 1311 and the flow grooves together with the plurality of inner annular grooves 1311, which are arranged at intervals along the axial direction of the flange barrel 131, so as to further improve the sealing between the flange 130 and the hollow insulating tube 110, which is not described in detail again. Further, a drying device 140 is disposed 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 drying agent box 141 and a drying agent 142 disposed in the drying agent box 141. Alternatively, the drying device 140 may be provided on both flanges 130, as long as the inside of the post insulator 10 can be dried. The desiccant box 141 may be made of a conductive material, and is provided with through holes with the same size and uniform distribution to form a shielding cage, and the desiccant box 141 is ensured not to affect the internal electric field of the hollow insulating tube 110 by using the shielding cage principle. Of course, the desiccant cartridge may also be made of a non-conductive material, such as plastic. The setting of the drying device 140 may be completed before S103 is performed, and is not limited to the completion in S101.

Wherein, the disk face of the flange plate 132 towards the hollow insulating tube 110 is further provided with a boss 1321, the drying device 140 is fixedly connected to the boss 1321, the boss 1321 and the flange plate 132 are coaxially arranged, the boss 1321 extends along the axial direction of the flange 130 towards the direction far away from the flange plate 132, and the disk face outer diameter of the boss 1321 is smaller than the inner diameter of the flange cylinder 131, so that a step surface is formed between the disk face of the boss 1321 and the disk face of the flange plate 132 towards the hollow insulating tube 110.

Finally, the outer diameter of the hollow insulating tube 110 is set to be slightly larger than the inner diameter of the flange barrel 131, so that the hollow insulating tube 110 and the flange barrel 131 are connected stably in an interference fit mode.

Further, in S102, an injection machine is provided, after coating the coupling agent on the outside of the hollow insulating tube 110, the hollow insulating tube is placed in a mold of the injection machine, and the shed 120 is integrally injected on the outer periphery of the hollow insulating tube 110 by adding the silicone rubber material.

The shed 120 of the present embodiment is fixed to the outer periphery of the hollow insulating tube 110 by injection, but in other embodiments, the shed may be fixed to the outer periphery of the hollow insulating tube 110 by other means such as molding, or the shed may be made of other rubber materials, and the invention is not limited thereto.

Before S103, an adhesive is applied to the outer wall of the hollow insulating tube 110 and/or the inner wall of the flange barrel 131, and then S103 is performed, specifically, a pressure device is provided, the hollow insulating tube 110 is press-fitted into the flange barrel 131 through the pressure device, that is, the hollow insulating tube 110 is fixedly connected with the two flanges 130 through interference fit, after S103, the region where the hollow insulating tube 110 and the flanges 130 are press-fitted and fixed is heated, cured and cooled, and finally the hollow insulating tube 110 is fixedly connected with the flanges 130, and after the adhesive applied to the outer wall of the hollow insulating tube 110 and/or the inner wall of the flange barrel 131 is cured, a seal is further formed between the tightly-combined hollow insulating tube 110 and the flange barrel 131, so that there is no need to provide another sealing structure between the outer wall of the hollow insulating tube 110 and the inner wall of the flange barrel 131, such as the second sealing groove 134 and the second sealing member adjacent to the flange 132 on the inner wall of the flange barrel 131. The open sides of the two flange cylinders 131 are respectively sleeved at two ends of the hollow insulating tube 110, so that the two flanges 130 respectively seal and cover the two ends of the hollow insulating tube 110, that is, the post insulator 10 is in a fully-closed state. At this time, the insulating medium in the hollow insulating tube 110 is untreated ambient air, that is, ambient air of the space where the post insulator 10 is produced, and the air pressure value in the hollow insulating tube 110 is consistent with the production ambient air pressure value when the post insulator 10 is prepared. Therefore, the post insulator 10 can be directly packaged in a production environment, the production is convenient, other treatments on insulating media are not needed, the insulating property meets the requirement, the production efficiency is high, and the processing cost is low.

In S104, a sealant groove 1313 is further formed in the end portion of the flange tube 131 away from the flange 132, a gap (not shown) is formed between the end portion of the hollow insulating tube 110 and the flange tube 131 after being sleeved on the end portion of the hollow insulating tube 110, and a third sealing element (not shown) is placed in the gap and then fixed by a sealant. So, through three-layer seal between hollow insulating tube 110 and the flange 130, the gluing agent between first sealing member, hollow insulating tube 110 and the flange section of thick bamboo 131 is sealed, the third sealing member has formed three-layer seal structure promptly, has further improved the whole sealing performance of post insulator 10, prevents that outside steam from getting into inside the post insulator 10.

The sealant can be room temperature vulcanized silicone rubber or other materials capable of being cured at room temperature, as long as reliable sealing of the third sealing element can be ensured.

The beneficial effect of this application is: 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 is the hollow insulating tube 110, and the inside of the hollow insulating tube 110 is ambient air, on one hand, the problem that the post insulator 10 has crack defects and interface problems due to solid filling is avoided, so that the electrical performance of the post insulator 10 is affected; on the other hand, because the ambient air is not filled through the inflation device, the step of inflation is then removed from, therefore also need not to set up the inflation device on its flange 130, for example inflation valve etc. simplified the structure, the cost is reduced, compare in traditional structure, the overall cost has reduced 30% at least, reduced gas leakage, the risk point of technology defect simultaneously, post insulator 10 can not produce the negative pressure state in the operation process, consequently need not to set up monitoring devices, and the ambient air also need not to carry out special treatment (for example drying process etc.), and overall performance is promoted. Meanwhile, compared with the prior art, the connection process of interference fit 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 automatic manufacturing level of subsequent products.

While the invention has been described with reference to the above disclosure and features, it will be understood by those skilled in the art that various changes and modifications in the above constructions and materials can be made, including combinations of features disclosed herein either individually or in any combination, as appropriate, without departing from the spirit of the invention. Such variations and/or combinations are within the skill of the art to which the invention pertains and are within the scope of the following claims.

Claims (10)

1. A method for manufacturing a post insulator comprises the following steps:

step (1): providing a hollow insulating pipe and two flanges, wherein the inner diameter of each flange is slightly smaller than the outer diameter of the hollow insulating pipe;

step (2): the hollow insulating pipe is externally and integrally coated with an umbrella skirt;

and (3): the two flanges are respectively fixed with the two ends of the hollow insulating pipe in a press fit manner through interference fit;

and (4): and sealing the gap between the flange and the hollow insulating pipe with glue to obtain the post insulator.

2. The method of manufacturing a post insulator according to claim 1, wherein said flange includes a flange barrel and a flange plate, said flange plate covering an end of said flange barrel.

3. The method for manufacturing a post insulator according to claim 2, wherein a first sealing groove is formed on a disc surface of the flange facing the hollow insulating tube, and a first sealing member is disposed in the first sealing groove before the step (3).

4. The post insulator of claim 3, wherein the width of the first seal groove is constant or gradually reduced in a direction approaching the hollow insulating tube, and an adhesive is applied in the first seal groove and/or the first sealing member.

5. The post insulator of claim 2, wherein before step (3), a drying device is disposed on the disk surface of said flange facing said hollow insulating tube, said drying device comprising a cage-shaped desiccant container and a desiccant disposed in said desiccant container, and a through hole is disposed on the outer periphery of said desiccant container.

6. The post insulator of claim 5, wherein said desiccant is disposed directly in said caged desiccant container and said desiccant device is secured to said flange.

7. The method of manufacturing a post insulator according to claim 6, wherein said desiccant is packaged in a cloth bag.

8. The method for manufacturing a post insulator according to claim 2, wherein an adhesive is applied to an outer wall of said hollow insulating tube and/or an inner wall of said flange cylinder before said step (3).

9. The method according to claim 1, wherein in the step (3), the two flanges are directly sleeved on two ends of the hollow insulating tube, and the insulating medium in the hollow insulating tube is ambient air.

10. The method for manufacturing a post insulator according to claim 8, wherein after the step (3), the region where the hollow insulating tube and the flange are press-fitted and fixed is heated, solidified and cooled.

Images