CN218525369U - Hollow insulating tube and composite insulator - Google Patents

Abstract

The application discloses hollow insulating tube includes interior axial layer, hoop layer and the outer axial layer that sets gradually by interior to exterior, and interior axial layer and outer axial layer all include a plurality of axial fiber yarn, and the hoop layer includes a plurality of hoop fiber yarn, and the winding angle on hoop layer is 45 ~ 90. The hollow insulating pipe greatly improves the circumferential strength and the axial strength of the hollow insulating pipe through the structural design of the circumferential layer, the inner axial layer and the outer axial layer; in addition, the main structure of the hollow insulating tube is made by directly transferring heat, solidifying and pultrusion through a solidifying die after yarn is dipped, so that the solidifying and molding efficiency is greatly improved, the product processing period is shortened, and the product production efficiency is improved. The application also discloses a composite insulator.

Description

Hollow insulating tube and composite insulator

Technical Field

The application relates to the technical field of power transmission insulating equipment, in particular to a hollow insulating tube and a composite insulator.

Background

Most of the existing composite insulators are hollow insulating pipes formed by wet winding or pultrusion, the layering structures of the hollow insulating pipes formed by wet winding are formed by hoop winding, the layering of yarns is concentrated in the hoop direction, and the tensile action of axial yarns is avoided, so that the bearing capacity of the annular acting force (internal pressure or external pressure) of the hollow insulating pipes is large, and the bearing capacity of the axial acting force (bending stress or compressive stress) is small; the layer spreading structures of the pultruded hollow insulating pipe are all formed by axial pultrusion, tension action of circumferential yarns is avoided, and finally the bearing capacity of circumferential acting force (internal pressure or external pressure) of the hollow insulating pipe is small and the bearing capacity of axial acting force (bending stress or compressive stress) is large.

The hollow insulating pipe formed by the two process methods cannot balance the circumferential acting force and the axial acting force, cannot enable the bearing capacity of the hollow insulating pipe in two directions to reach the best, and is limited in application range. In order to improve the axial bearing capacity of the hollow insulating pipe formed by wet winding, the wall thickness of the hollow insulating pipe needs to be greatly improved, and the problem of higher manufacturing cost exists; the hollow insulating tube wound by the wet method needs to be soaked and wound on the surface of a core mold to form a winding tube prefabricated part, and then the winding tube prefabricated part is transferred to a curing oven to be cured, namely, the winding process and the curing process are carried out step by step, the production period of the product is long, the efficiency is low, and the layout of a production line is dispersed and the loss is large; and the circumferential pressure bearing capacity of the hollow insulating pipe can not be obviously improved even the wall thickness of the pipe is improved.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the application aims to provide a hollow insulating pipe, wherein axial pultrusion yarns and circumferential winding yarns of the hollow insulating pipe are heated and molded through a curing mould after being impregnated, and the hollow insulating pipe greatly improves the bearing capacity of the hollow insulating pipe on circumferential acting force (internal pressure or external pressure) and simultaneously improves the bearing capacity of the hollow insulating pipe on axial acting force (bending stress or compressive stress) through the structural design of circumferential layers, inner axial layers and outer axial layers which are arranged in the circumferential direction; in addition, the main structure of the hollow insulating tube is formed by directly curing and pultrusion through a curing mould in a direct contact heat transfer mode after yarn is dipped, so that the curing and molding efficiency is greatly improved, the product processing period is shortened, and the product production efficiency is improved; the layer structure of the hollow insulating pipe is reasonable in design, and the wall thickness of the hollow insulating pipe can be reduced under the condition that the hollow insulating pipe achieves the same performance, so that the material is saved, and the material cost is reduced.

In order to achieve the above purpose, the technical means adopted by the application are as follows: the utility model provides a hollow insulating tube, includes interior axial layer, hoop layer and the outer axial layer that sets gradually from inside to outside, and interior axial layer and outer axial layer all include a plurality of axial fiber yarn, and the hoop layer includes a plurality of hoop fiber yarn, and the winding angle on hoop layer is 45 ~ 90. The hollow insulating pipe achieves the mechanical strength required by the hollow insulating pipe through the structural design of the annular layer, the inner axial layer and the outer axial layer, namely the annular layer provides the hollow insulating pipe with the bearing capacity for annular acting force (internal pressure or external pressure), the inner axial layer and the outer axial layer simultaneously provide the hollow insulating pipe with the bearing capacity for axial acting force (bending stress or compressive stress), and the strength required by the hollow insulating pipe is achieved through the sequential design and the thickness design of the inner axial layer, the annular layer and the outer axial layer; in addition, the main structure of the hollow insulating tube is formed by curing and pultrusion through a curing mould directly after yarn impregnation in a direct contact heat transfer mode, namely, the hollow insulating tube enters the curing mould for curing after a layering structure of the hollow insulating tube is formed, the production process of the product is compact, the layout of a production line is also compact, the curing and forming efficiency can be greatly improved, the processing period of the product is shortened, and the production efficiency of the product is improved; and the layer structure of the hollow insulating pipe is reasonable in design, and the wall thickness of the hollow insulating pipe can be reduced, the material is saved, and the material cost is reduced under the condition of achieving the same performance.

Wherein, the hoop layer includes forward winding layer and reverse winding layer, and the radial adjacent setting of hollow insulating tube is followed to forward winding layer and reverse winding layer, can strengthen hoop layer process stability, also promotes hollow insulating tube's hoop intensity simultaneously.

Wherein, forward winding layer and reverse winding layer all include a plurality of layers, and a plurality of forward winding layers and a plurality of reverse winding layer set up in turn, further strengthen the hoop intensity of hollow insulating tube.

The linear density of the inner axial layer, the annular layer and the outer axial layer is sequentially increased progressively, so that the preparation cost of the hollow insulating tube can be properly reduced.

The linear density of the inner axial layer is 400-2400 tex, the linear density of the annular layer is 1200-9600 tex, and the linear density of the outer axial layer is 4800-19200 tex, so that the overall performance of the hollow insulating pipe is ensured.

Wherein, a plurality of axial fiber yarns of the inner axial layer are polyester fibers. The chemical property of the polyester fiber is superior to that of glass fiber, the polyester fiber is corrosion resistant, and a polyester lining does not need to be arranged on the inner wall of the hollow insulating pipe, so that the processing difficulty and the material cost can be reduced.

The diameters of the fiber yarns of each of the inner axial layer, the circumferential layer and the outer axial layer are uniform, and calculation and design in a layering design stage are facilitated.

Wherein, the linear density of the annular layer is the same as that of the outer axial layer, so that the preparation is convenient.

The axial fiber yarns and the circumferential fiber yarns are glass fibers, and the glass fibers have high cost performance and can meet the performance requirements of the hollow insulating tube.

In view of the shortcomings of the prior art, it is another object of the present application to provide a composite insulator comprising any one of the hollow insulating tubes described above.

The beneficial effect of this application is: different from the prior art's condition, this application adopts the hollow insulating pipe that includes interior axial layer, hoop layer and outer axial layer to spread the layer structure, and wherein the hoop layer provides the bearing capacity to the hoop effort (internal pressure or external pressure) for hollow insulating pipe, and interior axial layer and outer axial layer provide the bearing capacity to axial effort (bending stress or compressive stress) for hollow insulating pipe simultaneously, and whole mechanical strength is high. And the forming process of the layer laying structure is simple and convenient, the production line is reasonable in layout, the production efficiency can be greatly improved, and the overall preparation cost is low.

Drawings

FIG. 1 is a partial cross-sectional view of a hollow insulating tube 100 according to an embodiment of the present application;

FIG. 2 is a partial cross-sectional view of a hollow insulating tube 200 according to an embodiment of the present application;

fig. 3 is a schematic winding angle diagram of a hollow insulating tube 200 according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a composite insulator 1000 according to an embodiment of the present application.

Detailed Description

As required, detailed embodiments of the present application will be disclosed herein. However, it is to be understood that the disclosed embodiments are merely exemplary of the application and that they 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 application in virtually any appropriately detailed manner, including employing various features disclosed herein in conjunction with features that may not be explicitly disclosed herein.

In an embodiment, as shown in fig. 1, the hollow insulating tube 100 includes an inner axial layer 110, a circumferential layer 120, and an outer axial layer 130 sequentially arranged from inside to outside along a radial direction of the hollow insulating tube, and each of the inner axial layer 110 and the outer axial layer 130 includes a plurality of axial fiber yarns and is formed by pultrusion, where the axial direction is along an axial direction of the hollow insulating tube 100. The hoop layer 120 includes a plurality of hoop fiber yarns and is formed by winding, wherein the hoop direction is a hoop direction along the hollow insulation pipe 100. And after the resin glue solution infiltrates the inner axial layer 110, the annular layer 120 and the outer axial layer 130, the resin glue solution is solidified to form the hollow insulating tube 100.

Wherein, the winding direction of the circumferential layer 120 and the axial direction of the hollow insulating pipe 100 are arranged at a certain angle, and the angle is preferably 45-90 degrees, so as to provide the circumferential strength of the hollow insulating pipe 100. The winding process with the winding angle smaller than 45 degrees belongs to small-angle winding, the process forming difficulty is high, the efficiency is low, the winding speed needs to be reduced to keep the matching with the pultrusion speed mainly due to the fact that the winding process is influenced by the phenomena that the speed is too low, the pause occurs and the like when the winding speed is too low. Therefore, the winding angle is selected to be larger than 45 degrees and not more than 90 degrees, the processing and forming are facilitated, and the efficiency can be improved.

Specifically, an inner axial layer 110 is formed by sequentially pultrusion of the impregnated axial fiber yarns, a circumferential layer 120 is formed by winding the impregnated circumferential fiber yarns outside the inner axial layer 110, and an outer axial layer 130 is formed outside the circumferential layer 120 by pultrusion of the impregnated axial fiber yarns, so that a preform of the hollow insulating tube 100 is formed, and the preform passes through a curing mold for heating and molding, and finally the hollow insulating tube 100 is obtained. Of course, in other embodiments, the inner axial layer, the hoop layer, and the outer axial layer may be formed by pultrusion and winding fiber yarns layer by layer, and then the whole may be dipped and cured, which is not limited in this respect.

The hollow insulating tube 100 formed by the stretch-wrap process achieves the required mechanical strength of the hollow insulating tube 100 by sequentially designing the structures of the inner axial layer 110, the circumferential layer 120 and the outer axial layer 130. Wherein the hoop layer 120 provides the hollow insulating pipe 100 with a bearing capacity against hoop force (internal pressure or external pressure), i.e., provides the hollow insulating pipe 100 with hoop strength, and prevents the hollow insulating pipe 100 from being damaged by bearing hoop internal load or external load; the inner axial layer 110 and the outer axial layer 130 can provide the hollow insulating tube 100 with bearing capacity for axial acting force (bending stress or compressive stress), namely, provide axial strength for the hollow insulating tube 100, and avoid the hollow insulating tube 100 from being damaged due to bearing axial tensile load or compressive load, so that compared with a wound tube and a pultruded tube, the hollow insulating tube 100 can balance the circumferential acting force and the axial acting force, and can enable the bearing capacity of the hollow insulating tube 100 in two directions to reach the best, the performance is good, and the application range is wide. In addition, the main structure of the hollow insulating tube 100 is a product formed by directly transferring heat and curing through a curing mold after yarn is dipped in glue solution, namely, the hollow insulating tube 100 enters the curing mold for curing after being formed in a layering structure, so that the production process of the product is compact, and the layout of a production line is compact; the inner axial layer 110 can replace the traditional composite felt liner, namely the step of arranging the composite felt liner on the inner wall of the hollow insulating pipe can be eliminated, and the forming process of the hollow insulating pipe 100 is simplified, so that the curing forming efficiency can be greatly improved, the product processing period is shortened, and the product production efficiency is improved; meanwhile, the layer structure of the hollow insulating tube 100 is reasonable in design, the wall thickness of the hollow insulating tube 100 can be reduced under the condition of achieving the same performance, materials are saved, and the material cost is reduced.

In an implementation scenario, as shown in table 1, a hollow insulating pipe with an axial bending strength of 400MPa and an internal pressure bearing strength of 4.24MPa is designed, and a hollow insulating pipe molded by using a wet-process winding and layering structure is used as a comparative example, and the hollow insulating pipe of the comparative example should be designed to have an inner diameter of 230mm and an outer diameter of 248mm, that is, a wall thickness of 9mm, according to the strength requirement of the hollow insulating pipe; the same mechanical performance requirements are met, and by using the layer structure of the hollow insulating pipe 100 of the embodiment, the hollow insulating pipe 100 only needs to be designed to have an inner diameter of 230mm and an outer diameter of 242mm, namely, the wall thickness is 6mm, so that the production and manufacturing cost can be greatly reduced; in addition, the hollow insulating pipe with the inner diameter of 230mm, the outer diameter of 248mm and the length of 1000mm is formed by wet winding, the curing and forming time is at least 16h, while the hollow insulating pipe (with the inner diameter of 230mm, the outer diameter of 242mm and the length of 1000 mm) in the embodiment only needs 0.5h, so that the production efficiency of the hollow insulating pipe can be greatly improved by adopting the layer laying structure in the embodiment.

TABLE 1 comparison of parameters between the present example and the comparative example

In addition, if the hollow insulating pipe is formed by pultrusion, the wall thickness of the hollow insulating pipe needs to be set larger to meet the circumferential strength of the hollow insulating pipe while meeting the axial strength of the hollow insulating pipe; and possess the hollow insulating tube 100 of axial strength and hoop strength simultaneously in this application, its wall thickness only need according to axial and hoop intensity design can, need not to satisfy hollow insulating tube 100's strength requirement through increasing the wall thickness.

Therefore, compared with a winding-formed hollow insulating tube or a pultrusion-formed hollow insulating tube, the hollow insulating tube 100 of the present embodiment can reduce the wall thickness of the hollow insulating tube 100 and save materials, thereby reducing the cost, under the condition of achieving the same performance.

In addition, the hollow insulating tube with the same mechanical property is prepared, two different forming processes, namely a stretch-wrap forming process and a wet-process stretch-wrap forming process are compared, and the cost reduction rate of the stretch-wrap forming process can reach more than 40% only by comparing the three aspects of materials, labor and energy consumption.

Furthermore, the economic advantages of the stretch-wrap forming process are also shown in the fixed asset investment, the core mould tools, hot air drying ovens, winding machines, demoulding machines, cutting machines, lathes, traveling cranes, logistics transport vehicles and the like with different specifications need to be input in the wet-process stretch-wrap forming process from the fixed asset and management cost investment angle for comparative analysis, the requirements of various types of equipment are integrated, meanwhile, due to the multi-process circulation, products and equipment also occupy more production plants, and the investment of a single production line is estimated preliminarily to be nearly ten million; however, the stretch wrap forming process only needs a forming die and traction equipment, equipment requirements are few, equipment asset investment is greatly reduced, in addition, because the production line is compact and regular, the circulation among product processes is reduced, the occupied area requirement of a workshop is reduced, and compared with the production requirement of the same product, the input of the stretch wrap forming process production line is estimated to be about millions. Therefore, the hollow insulation pipe 100 formed by the stretch-forming process of the present application has great advantages, both from a technical point of view and an economic point of view.

In one implementation scenario, the linear density of the inner axial layer 110, the hoop layer 120, and the outer axial layer 130 sequentially increases. The linear density is the mass of the yarn per unit length, and the smaller the linear density is, the better the wettability of the yarn is, and the better the mechanical properties of the hollow insulation tube 100 are.

In other implementation scenes, the linear densities of the circumferential layer and the outer axial layer can be the same, so that the hollow insulating pipe is convenient to prepare, and the design scheme can be adjusted according to the performance requirement of the hollow insulating pipe.

Specifically, in the present embodiment, the linear density of the inner axial layer 110 is 400tex to 2400tex, the linear density of the hoop layer 120 is 1200tex to 9600tex, and the linear density of the outer axial layer 130 is 4800tex

19200tex. During use of the hollow insulating tube 100, the yarns on the inner wall of the hollow insulating tube 100 need to have optimal electrical and chemical resistance properties, since the inner wall may be subjected to arc radiation and chemical corrosion, while the yarns on the outer layer of the hollow insulating tube 100 mainly provide mechanical properties. The yarns with the linear density of 400 to 2400tex have good wettability, the cured and molded inner axial layer 110 has good chemical corrosion resistance and electrical performance, the mechanical performance is also excellent, the requirements of the inner axial layer 110 are met, and any linear density yarn in the range can be used; the yarns with the linear density of 1200tex to 9600tex have good wettability, and under the condition that the performance requirement of the annular layer 120 is lower than that of the inner axial layer 110, the cost of the yarns with the linear density of 1200tex to 9600tex is lower, so that the requirements of the annular layer 120 are met, and any linear density of the yarns in the range can be used; the outer axial layer 130 has the lowest performance requirements for the yarns, so the linear density of the used yarns is the highest, the cost is the lowest, and the yarns with the linear density of 4800 tex-19200 tex are adopted, and the yarns with any linear density in the range can meet the requirements of the outer axial layer 130. Since the higher the linear density, the lower the wettability and the lower the yarn cost, the linear densities of the inner axial layer 110, the circumferential layer 120 and the outer axial layer 130 are sequentially increased, so that the performance requirements of the hollow insulating tube 100 can be ensured, the cost can be properly reduced, and the preparation cost of the hollow insulating tube 100 can be optimized. In addition, it is preferable to keep the fiber yarn diameters of the layers uniform, facilitating calculations and design during the ply design phase. In general, it is sufficient if the sequentially increasing linear density rule of the inner axial layer 110, the circumferential layer 120 and the outer axial layer 130 is satisfied. It is understood that in other embodiments, the linear density of the inner axial layer, the hoop layer, and the outer axial layer may be optional within their ranges.

In an implementation scenario, the hollow insulating tube 100 is made of glass fibers, that is, the inner axial layer 110, the circumferential layer 120 and the outer axial layer 130 are all made of glass fibers, so that the situation that the interface connection of each layer structure of the hollow insulating tube 100 is untight due to the fact that the layer structures are made of different materials is avoided, meanwhile, the glass fibers are the most common fibers in the current market and have the highest cost performance, the performance requirement of the hollow insulating tube 100 can be met, and the economic maximization of a product can be realized by controlling the material cost to the maximum extent.

In another implementation scenario, the hollow insulating tube 100 is made of polyester fibers, compared with glass fibers, the polyester fibers have stronger corrosion resistance and better electrical performance, and the inner axial layer 110 directly uses the polyester fibers, so that a polyester fiber lining layer can be prevented from being arranged on the inner wall of the hollow insulating tube 100. Of course, in other embodiments, the hollow insulating tube may also be made of aramid fiber or other types of fibers with good insulating properties and mechanical properties, and the type of the fiber yarn is determined according to the specific application scenario and working condition of the hollow insulating tube, as long as the requirements of the internal insulating properties of the hollow insulating tube and the mechanical properties of the whole hollow insulating tube can be met.

Wherein, because the layer structure of spreading of difference can be designed according to the requirement of the hoop mechanical properties and the axial mechanical properties of hollow insulating pipe, that is to say, design the conversion according to axial strength demand, the hoop strength demand of hollow insulating pipe, the thickness that each layer was spread to output hollow insulating pipe. Therefore, as described above, the inner axial layer 110, the circumferential layer 120 and the outer axial layer 130 have different performance requirements for yarns, generally, the yarn performance requirement of the inner axial layer 110 is the highest, the quality is the best, and the price is the highest, the circumferential layer 120 times and the outer axial layer 130 are the last, and through design and verification, the optimal yarn thickness ratio is obtained, so that the production cost can be optimized on the premise of ensuring the performance of the hollow insulating tube 100.

In this embodiment, the resin adhesive solution may be any one of polyurethane resin, epoxy resin, vinyl resin, phenolic resin, and unsaturated polyester resin, and the prepared insulating product has stable mechanical properties and excellent electrical properties.

According to the hollow insulating pipe 100 of the embodiment, through the structural design of the circumferential layer 120, the inner axial layer 110 and the outer axial layer 130, the circumferential layer 120 greatly improves the bearing capacity of the hollow insulating pipe 100 for a circumferential acting force (internal pressure or external pressure), and the inner axial layer 110 and the outer axial layer 130 improve the bearing capacity of the hollow insulating pipe 100 for an axial acting force (bending stress or compressive stress); in addition, the main structure of the hollow insulating tube 100 is a product formed by directly transferring heat and curing through a curing mold after yarn impregnation, that is, the hollow insulating tube 100 enters the curing mold for curing after the layer structure is formed, the production process of the product is compact, the layout of a production line is also compact, the curing and forming efficiency can be greatly improved, the processing period of the product is shortened, and the production efficiency of the product is improved.

In another embodiment, as shown in fig. 2, the circumferential layers 220 of the hollow insulating tube 200 comprise a forward winding layer 221 and a reverse winding layer 222, and the forward winding layer 221 and the reverse winding layer 222 are adjacently disposed in a radial direction of the hollow insulating tube 200. That is, the winding angle of the winding layer is the same, the winding direction is opposite, the process stability of the circumferential layer 220 can be further enhanced, and the circumferential strength of the hollow insulating pipe 200 is also improved. Specifically, after the inner axial layer 210 is formed, the reverse winding layer 222 is formed by winding the inner axial layer 210 outward, and then the forward winding layer 221 is formed by winding the reverse winding layer 222 outward, where the forward and reverse directions are not specific to which direction is the forward direction and which direction is the reverse direction, but only with respect to the forward winding layer 221 and the reverse winding layer 222, the winding directions are opposite. Of course, in other embodiments, the winding angles of the forward winding layer and the reverse winding layer may be different as long as the requirement of the circumferential mechanical property of the hollow insulating pipe is met; or, in other embodiments, there are more than one forward winding layer and one reverse winding layer, and the forward winding layers and the reverse winding layers are alternately arranged, so as to further enhance the hoop strength of the hollow insulating pipe, which is not limited herein.

In one implementation scenario, referring to fig. 2 and 3, the winding angle of the hoop layer 220 is represented by θ, and preferably, the winding angle of the forward winding layer 221 is the same as the winding angle of the reverse winding layer 222, both represented by θ. Here, the winding angle θ of the forward winding layer 221 and the reverse winding layer 222 ranges from 45 ° to 85 ° (including 45 ° and 85 °, the same applies below). The circumferential fiber yarn is subjected to actual winding and laying layer design and material selection, the winding angle theta is designed to be 45-85 degrees, and the circumferential strength of the hollow insulating pipe 200 is mainly provided. The winding process with the winding angle smaller than 45 degrees belongs to small-angle winding, the process forming difficulty is high, the efficiency is low, the winding speed needs to be reduced to keep the matching with the pultrusion speed mainly due to the fact that the winding process is influenced by the phenomena that the speed is too low, the pause occurs and the like when the winding speed is too low. When the winding angle is larger than 85 degrees, the fiber yarn is similar to pure hoop winding, namely the axial direction of the fiber yarn and the axial direction of the hollow insulating tube 200 are close to a vertical state, the effect of the forward and reverse simultaneous winding on improving the hoop strength of the hollow insulating tube 200 is not obvious, namely the forward and reverse simultaneous winding can be carried out when the winding angle of the hoop layer is 85-90 degrees (including 90 degrees and not including 85 degrees), and the unidirectional winding can also be directly carried out. Therefore, when the hollow insulating pipe 200 is wound in the forward and reverse directions simultaneously, the winding angle theta is designed to be 45-85 degrees, so that the winding speed and the pultrusion speed are matched while the annular strength of the hollow insulating pipe 200 is improved, the forming efficiency is high, and the quality of a finished product is good.

The structure of the circumferential layer 220 is reasonably optimized, so that the hollow insulating pipe 200 of the embodiment can ensure that the hollow insulating pipe 200 has more excellent internal pressure strength and axial bending strength.

In another embodiment, as shown in fig. 4, the composite insulator 1000 includes a flange 600 and an insulating shed 700, and further includes the hollow insulating tube 100, the flange 600 is fixedly sleeved at both ends of the hollow insulating tube 100, and the insulating shed 700 covers the outer circumference of the hollow insulating tube 100.

In an implementation scenario, the flange 600 and the hollow insulating tube 100 are sealed and fixed by means of a glue connection. In other implementation scenarios, the flange and the hollow insulating pipe may be fixed in other manners such as interference fit.

In another implementation scenario, the insulating shed 700 is a high-temperature vulcanized silicone rubber shed, and is injected to the outer circumference of the hollow insulating tube 100 by high-temperature injection. In other implementation scenarios, the insulating shed may be made of other types of rubber materials or hard plastic materials.

In other embodiments, the composite insulator may be any one of the hollow insulating pipes in the above embodiments.

The composite insulator 1000 of the embodiment adopts the hollow insulating tube 100, so that the mechanical property and the electrical property of the composite insulator 1000 are more excellent, and meanwhile, the labor cost and the material cost of the composite insulator 1000 are lower.

The beneficial effect of this application is: different from the prior art's condition, this application adopts the hollow insulating pipe that includes interior axial layer, hoop layer and outer axial layer to spread the layer structure, and wherein the hoop layer provides the bearing capacity to the hoop effort (internal pressure or external pressure) for hollow insulating pipe, and interior axial layer and outer axial layer provide the bearing capacity to axial effort (bending stress or compressive stress) for hollow insulating pipe simultaneously, and whole mechanical strength is high.

Meanwhile, the main structure of the hollow insulating tube is a product formed by directly transferring heat and curing through a curing mold after yarn is impregnated with glue solution, namely, the hollow insulating tube enters the curing mold for curing after a layering structure of the hollow insulating tube is formed, the production process of the product is compact, and the layout of a production line is compact; and the inner axial layer can replace the traditional composite felt lining, namely the step of arranging the composite felt lining on the inner wall of the hollow insulating pipe can be eliminated, and the forming process of the hollow insulating pipe is simplified, so that the curing forming efficiency can be greatly improved, the product processing period is shortened, and the product production efficiency is improved.

In addition, the layer structure design of the hollow insulating pipe is reasonable, the wall thickness of the hollow insulating pipe can be reduced under the condition that the same performance is achieved, materials are saved, and the material cost is reduced.

While the specification and features of the present application have been described above, it will be understood that various changes and modifications in the above-described constructions and materials, including combinations of features disclosed herein either individually or in any combination, will be apparent to those skilled in the art upon studying the disclosure. Such variations and/or combinations are within the skill of the art to which this application pertains and are within the scope of the claims of this application.

Claims (10)

1. A hollow insulating tube is characterized in that: including interior axial layer, hoop layer and the outer axial layer that sets gradually by interior to exterior, interior axial layer with outer axial layer all includes a plurality of axial fiber yarn, the hoop layer includes a plurality of hoop fiber yarn, the winding angle on hoop layer is 45 ~ 90.

2. The hollow insulating tube of claim 1, wherein: the hoop layer includes forward winding layer and reverse winding layer, forward winding layer with reverse winding layer is followed hollow insulating tube's radial adjacent setting.

3. The hollow insulating tube of claim 2, wherein: the forward winding layer and the reverse winding layer comprise a plurality of layers, and the forward winding layer and the reverse winding layer are alternately arranged.

4. The hollow insulating tube of claim 1, wherein: the linear densities of the inner axial layer, the annular layer and the outer axial layer are sequentially increased.

5. The hollow insulating tube of claim 1, wherein: the linear density of the inner axial layer is 400tex to 2400tex, the linear density of the annular layer is 1200tex to 9600tex, and the linear density of the outer axial layer is 4800tex to 19200tex.

6. The hollow insulating tube of claim 1, wherein: the plurality of axial fiber yarns of the inner axial layer are polyester fibers.

7. The hollow insulating tube of claim 1, wherein: the fiber yarn diameter of each of the inner axial layer, the hoop layer and the outer axial layer is uniform.

8. The hollow insulating tube of claim 1, wherein: the circumferential layer and the outer axial layer have the same linear density.

9. The hollow insulating tube of claim 1, wherein: the axial fiber yarns and the circumferential fiber yarns are all glass fibers.

10. A composite insulator is characterized in that: comprising a hollow insulating tube according to any of claims 1 to 9.

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