CN215377081U - Insulating cross arm - Google Patents

Abstract

The utility model discloses an insulating cross arm which comprises at least one post insulator, wherein the post insulator comprises a hollow insulating pipe, an umbrella skirt positioned on the periphery of the hollow insulating pipe and two flanges arranged at two ends of the hollow insulating pipe, the two flanges seal and cover two ends of the hollow insulating pipe, and an insulating medium in the hollow insulating pipe is ambient air. The insulating cross arm comprises the hollow post insulator, and has the advantages of simple structure, simple and convenient manufacturing process, low manufacturing cost and no need of operation and maintenance monitoring.

Description

Insulating cross arm

Technical Field

The utility model relates to the field of power transmission lines, in particular to an insulating cross arm.

Background

At present, the insulation cross arm in the industry mostly adopts a combined structure of a post insulator and a cable-stayed insulator, wherein the post insulator currently comprises the following technical routes: coating room temperature vulcanized silicone Rubber (RTV) paint on the porcelain insulator; secondly, a porcelain core composite post insulator, namely, the umbrella skirt adopts silicon rubber, and the core rod adopts a porcelain insulator; solid composite post insulators, namely, composite solid cores; fourthly, filling solid insulating medium in the hollow composite insulator; fifthly, filling pressure gas in the hollow composite insulator, wherein the outer insulation umbrella covers of the last three types are made of silicon rubber materials.

However, several of the above-mentioned technical routes present problems from the practice of long-term production manufacturing and engineering applications, such as that the solid filling may present microcrack defects and interface problems, affecting the electrical performance of the post insulator; the hollow insulating tube filled with gas easily has the problems of air leakage, negative pressure caused by process defects, operation and maintenance monitoring and the like. Meanwhile, when the hollow insulating tube is filled with insulating gas, the air pressure value of the gas in the hollow insulating tube is positive pressure, the micro-water control range margin of the hollow insulating tube is small, and the control difficulty is high, so that the production process requirement difficulty is high, and the manufacturing cost is relatively high. Therefore, new technology and new design are urgently needed to be introduced to the application of the post insulator on the insulating cross arm, the updating and upgrading of products are realized, and the construction and the development of a power grid are better served.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model aims to provide the insulating cross arm which is simpler in structure, simpler and more convenient in manufacturing process, lower in manufacturing cost and free from operation and maintenance monitoring.

In order to achieve the purpose of the utility model, the technical means adopted by the utility model are as follows: the utility model provides an insulating cross arm, includes at least one post insulator, and post insulator includes hollow insulating tube, is located hollow insulating tube outlying full skirt and sets up in two flanges at hollow insulating tube both ends, and two flange seal cover hollow insulating tube's both ends, and the insulating medium in the hollow insulating tube is ambient air.

The insulating cross arm adopts a hollow post insulator, the core body of the post insulator adopts a hollow insulating tube, the inside of the hollow insulating tube is ambient air, special treatment (such as drying treatment and the like) is not required, other gases are not required to be additionally filled, the step of inflation is omitted, and therefore an inflation device is not required to be arranged on a flange of the hollow insulating tube, such as an inflation valve and the like, the structure is simplified, the cost is reduced, and the risk point of air leakage is reduced.

Preferably, the flange comprises a flange cylinder and a flange disc, the flange cylinder is of a hollow structure along the axial direction, and the flange disc covers one end of the flange cylinder, 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, so that punching is not needed, the processing is convenient, and the sealing performance is good.

Preferably, the post insulator further comprises a drying device, and the drying device is arranged on the flange and is arranged inside the post insulator so as to remove moisture inside the post insulator.

Preferably, the number of the post insulators is one, one end of each post insulator is connected with the tower body of the power transmission tower, and the other end of each post insulator is used for hanging the power transmission line.

Preferably, the number of the post insulators is two, one end of each of the two post insulators is connected with the tower body of the power transmission tower, and the other ends of the two post insulators are connected together to form an insulating cross arm for hanging the end part of the power transmission line.

Preferably, the insulating cross arm further comprises at least one cable-stayed insulator, one end of each of the post insulator and the cable-stayed insulator is used for being connected with the body of the power transmission tower, and the other end of each of the post insulator and the cable-stayed insulator is connected together to form the insulating cross arm for hanging the end part of the power transmission line.

Preferably, the number of the post insulators is one, the number of the diagonal-pulling insulators is one, a single-post single-pulling type insulating cross arm is formed, and the structure is simple.

Preferably, the number of the post insulators is one, and the number of the diagonal-pulling insulators is three, so that a single-post triple-pull type insulating cross arm is formed, the insulating cross arm is made into a stable triangular structure, and the stability of the insulating cross arm can be greatly improved.

Preferably, the number of the post insulators is two, and the number of the diagonal insulators is two, so as to form a double-post double-pull type insulating cross arm, so that a stable triangular structure is formed between the insulating cross arm and the tower body of the power transmission tower, and the stability of the insulating cross arm can be greatly improved.

Preferably, the air pressure value in the hollow insulating tube is consistent with the air pressure value of the production environment when the post insulator is prepared.

The beneficial effect of this application is: different from the situation of the prior art, the insulating cross arm of the application adopts the hollow post insulator, namely the core body of the post insulator adopts the hollow insulating tube, and the inside of the hollow insulating tube is ambient air, 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 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, in insulating cross arm operation process, post insulator can not produce negative pressure state, consequently need not to set up monitoring devices, and ambient air also need not to carry out special treatment (for example drying process etc.), overall performance is promoted.

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 portion A of FIG. 1 in another implementation scenario;

fig. 6 is a partial perspective view of a transmission tower 1000 according to an embodiment of the present invention;

fig. 7 is a partial perspective view of a transmission tower 2000 according to another embodiment of the present invention.

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 utility model, 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 hollow 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 inflation device, the inflation step is omitted, an inflation valve structure, the inflation device, gas and the like are omitted, the structure is simplified, the cost is reduced, the overall cost is reduced by at least 30%, the risk points of gas leakage and process defects are reduced, the post insulator cannot generate a negative pressure state in the operation process, a monitoring device is not needed, special treatment (such as drying treatment and the like) is not needed for the ambient air, 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 0 MPa.

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 size and the number of the inner annular grooves 1311 and the outer annular grooves are consistent, the hollow insulating tube 110 is sleeved in the flange barrel 131, and when one end of the hollow insulating tube 110 is abutted to the disc surface of the flange 132 facing the hollow insulating tube 110, the inner annular grooves 1311 and the outer annular grooves are matched in position and correspond to each other. 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, in the axial direction of the post insulator 10, 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 is in the range of 0.2 to 1.0, for example, 0.2, 0.5, 0.8, or 1.0. Specifically, as the binding ratio decreases, the strength of the post insulator 10 decreases significantly, for example, when the binding ratio is decreased to 0.15, the strength of the post insulator 10 decreases by 20% compared to 0.2, and when the binding ratio is increased to 1.2, the strength of the post insulator 10 increases slightly but the cost 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 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 barrel 131, and a first sealing element (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.

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 in 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 further, the flange 132 and the end of the hollow insulating tube 110 are in 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.

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 is kept constant in the direction close to the hollow insulating tube 110, is convenient to process, 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 in the scheme, 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 decreased in a direction approaching the hollow insulating tube 110 (as shown in fig. 4), or may be curvilinearly decreased (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 magnitude of interference make between the two can combine closely, then need not to set up the second seal groove again, can also scribble 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, guarantee sealed effect.

Further, when the hollow insulating tube 110 is fixedly connected with the two flanges 130 through interference fit, since the adhesive is directly coated between the hollow insulating tube 110 and the flange barrel 131, the inner wall of the flange barrel 131 also 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 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 to a certain extent can influence the mechanical properties of ring flange 132, 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 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 is not affected by the screw holes 1322 without increasing the thickness of the flange 132 as a whole, and the economy is more superior. 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.

In yet another application scenario, as shown in fig. 6, in an overhead transmission line, a transmission tower 1000 includes a tower body 1100 and an insulating cross-arm 1200 connected to the tower body 1100, and the insulating cross-arm 1200 includes one of the post insulators 10. The tower body 1100 may be a transmission tower structure of a lattice tower, a pole body, or a composite material pole tower, and only a part of the structure is shown in fig. 6. One end of the post insulator 10 is connected to the tower 1100, and the other end is used for hanging a power transmission line.

As shown in fig. 1 and 6, the post insulator 10 includes a hollow insulating tube 110, an umbrella skirt 120 and two flanges 130, the umbrella skirt 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 specific structures and materials of the hollow insulating tube 110, the umbrella skirt 120 and the two flanges 130 are the same as those described above, and are not described again.

As shown in fig. 1 and fig. 2, the flange 130 includes a flange cylinder 131 and a flange 132, the flange cylinder 131 is hollow along the axial direction, and the flange 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. 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.

The post insulator 10 further includes a drying device 140, the drying device 140 is disposed on the flange 130 and located inside the post insulator 10 to remove water vapor inside the post insulator 10, and the structure and material of the drying device 140 are the same as those described above and are not described again.

In one embodiment, power transmission tower 1000 further includes a cable-stayed insulator 20, and one end of post insulator 10 and one end of cable-stayed insulator 20 are both connected to tower 1100, and the other ends are connected together by an end fitting to form an insulating cross arm 1200 for hanging the end of the power transmission line. The number of the diagonal tension insulators 1220 is at least one, such as one, two, three or more.

Specifically, when the number of the post insulators 10 is one and the number of the cable-stayed insulators 20 is one, the cable-stayed insulators 20 are located above the post insulators 10, and the axes of the cable-stayed insulators 20 and the axes of the post insulators 20 are located on the same plane, and then the insulating cross arm 1200 is a single-column single-pull insulating cross arm. When the number of the post insulators 10 is one and the number of the cable-stayed insulators 20 is two or more, the cable-stayed insulators 20 are arranged at intervals around the post insulators 10, and the axes of the two cable-stayed insulators 20 and the axes of the post insulators 10 are in the same plane, and when there are two cable-stayed insulators 20, for example, the insulating cross arm 1200 is a single-column double-pull insulating cross arm; when there are three cable-stayed insulators 20, the insulating cross arm 1200 is a single-column three-pull insulating cross arm (shown in fig. 6), and so on, and the description is omitted.

The single-column three-pull type insulating cross arm enables the insulating cross arm 1200 to form a stable triangular structure, and the stability of the insulating cross arm can be greatly improved.

It should be noted that the insulating cross arm 1200 may not include a cable-stayed insulator, in this case, the insulating cross arm 1200 only includes at least one post insulator 10, that is, the number of the post insulators 10 may be one, two or more, and when the number of the post insulators 10 is greater than one, one end of each of the plurality of post insulators 10 is connected to the tower 1100, and the other end is connected together to form the insulating cross arm 1200 for hanging the end of the power transmission line, and the plurality of post insulators 10 are arranged at intervals. For example, when the number of post insulators 10 is one, the insulating cross arm 1200 is a single-column insulating cross arm at this time; when the number of the post insulators 10 is two, the insulating cross arm 1200 is a dual-post insulating cross arm, and so on, and will not be described again.

In another embodiment, as shown in fig. 7, the power transmission tower 2000 includes a tower body 2100 and an insulating cross-arm 2200 connected to the tower body 2100, and the insulating cross-arm 2200 includes two post insulators 10 and two diagonal pull insulators 20. The tower 2100 is identical to the tower 1100 described above and will not be described in detail. One end of each of the two post insulators 10 and the two diagonal insulators 20 is connected to the tower 2100 of the power transmission tower 2000, and the other end of each of the two post insulators 10 and the two diagonal insulators 20 is connected together to form an end of the insulating cross arm 2200 for hanging the power transmission line, wherein the two diagonal insulators 20 are located above the two post insulators 10 and are respectively adjacent to the two post insulators 10, and the two post insulators 10 and the two diagonal insulators 20 are arranged to form a stable triangular structure between the insulating cross arm 2200 and the tower 2100, so that the stability of the insulating cross arm 2200 can be greatly improved.

The beneficial effect of this application is: different from the prior art, the post insulator 10 adopted by the insulating cross arm is of a hollow structure, namely, the core of the post insulator 10 adopts the hollow insulating tube 110, and the inside of the hollow insulating tube 110 is ambient air, so that on one hand, the crack defect and the interface problem of the post insulator 10 caused by solid filling are avoided, and the electrical performance of the post insulator 10 is influenced; 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, in insulating cross arm operation process, post insulator 10 can not produce the negative pressure state, 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.), overall performance is promoted.

While the utility model 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 utility model. Such variations and/or combinations are within the skill of the art to which the utility model pertains and are within the scope of the following claims.

Claims (10)

1. The utility model provides an insulating cross arm, its characterized in that includes at least one post insulator, the post insulator includes hollow insulating tube, is located hollow insulating tube outlying full skirt and set up in two flanges at hollow insulating tube both ends, two flange seal closing cap the both ends of hollow insulating tube, the insulating medium in the hollow insulating tube is ambient air.

2. The insulating cross arm of claim 1, wherein the flange comprises a flange cylinder and a flange plate, the flange cylinder is hollow along the axial direction, and the flange plate covers one end of the flange cylinder.

3. The insulating cross arm of claim 1, wherein said post insulator further comprises a drying device disposed on said flange and disposed within said post insulator.

4. The insulating cross arm of claim 1, wherein the number of the post insulators is one, one end of the post insulator is connected with a body of a transmission tower, and the other end of the post insulator is used for hanging a transmission line.

5. The insulating cross arm of claim 1, wherein the number of the post insulators is two, and one end of each of the two post insulators is connected to the body of the transmission tower, and the other ends of the two post insulators are connected together to form the insulating cross arm for hanging the end of the transmission line.

6. The insulating cross arm of claim 1, further comprising at least one cable-stayed insulator, wherein the post insulator and the cable-stayed insulator are each adapted to be connected at one end to a body of a power transmission tower and at the other end to form the insulating cross arm for hanging an end of a power transmission line.

7. The insulating cross arm of claim 6, wherein the number of the post insulators is one, and the number of the cable-stayed insulators is one, so that a single-post single-pull type insulating cross arm is formed.

8. The insulating cross arm of claim 6, wherein the number of the post insulators is one, and the number of the cable-stayed insulators is three, so that a single-post three-pull type insulating cross arm is formed.

9. The insulating cross arm of claim 6, wherein the number of the post insulators is two, and the number of the cable-stayed insulators is two, so as to form a double-post double-pull type insulating cross arm.

10. The insulating cross arm of claim 1, wherein the air pressure within the hollow insulating tube is at a value consistent with the air pressure of the production environment at the time of preparing the post insulator.

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