Patent Description:
With the development and application of composite insulators, post insulators used in power equipment are mostly large-diameter composite insulators. The composite post insulator includes a hollow composite insulating tube and an insulating material filled in the insulating tube, so as to meet electrical and mechanical properties of the power equipment. In prior art, insulating material filling generally includes solid filling and gas filling. The solid filling generally refers to that a polyurethane material is filled in the hollow insulating tube, and the gas filling generally refers to that high-pressure nitrogen is filled in the hollow insulating tube.

However, the solid filling and high-pressure gas filling face practical problems that need to be solved urgently. Possible interface problems caused by solid filling will affect the electrical property of the post insulators. The hollow insulating tube filled with high-pressure nitrogen has certain internal gas leakage problems, so it needs regular inspection and maintenance. Moreover, the hollow insulating tube is filled with high-pressure insulating gas, the margin of the micro-water control range of the hollow insulating tube is small, and the control is difficult, leading to higher requirements for manufacturing.

<CIT> relates to a high voltage bushing with support for the conductor. <CIT> discloses a high-voltage insulator, in particular to a post insulator, as used to support busbars or cables for example in high-voltage direct-current transmission systems, or HVDCT systems for short, or high-voltage installations. <CIT> relates to an insulator and compound cross arm. <NPL>, Gas Insulated Wall Bushing, Type Ggfl, Installation And Maintenance Guide, discloses a gas insulated bushing.

As for shortcomings in prior art, an object of the present disclosure is to provide a post insulator. The post insulator solves the possible interface problems caused by solid filling, and further solves the gas leakage problems caused by high-pressure gas filling, such that the post insulator is free from inspection and maintenance. Moreover, the margin of the micro-water control range is increased, and the difficulty of micro-water control and manufacturing is reduced.

For achieving the above object, the subject matter of the independent claims is provided. The dependent claims describe optional embodiments of the invention.

The present disclosure adopts the following technical solution, that is, a post insulator includes a hollow insulating tube, a shed positioned on a periphery of the hollow insulating tube, and an upper flange and a lower flange provided at both ends of the hollow insulating tube. Gas is sealed inside the hollow insulating tube, and the gas has an absolute pressure in a range of <NUM> MPa to <NUM> MPa.

The absolute pressure of the gas inside the post insulator is set to <NUM> MPa to <NUM> MPa. The gas in a normal pressure state is not easy to leak, and thus there is no need to perform maintenance and inspection. Moreover, setting the absolute pressure of the filled gas at the normal pressure to be in a certain range can meet a pressure difference between different regions and between altitudes, so as to ensure that the gas inside the insulating tube is in a non-negative pressure state when used in different regions. Furthermore, the insulating tube filled with gas at the normal pressure has a large margin for micro-water control, which effectively reduces the difficulty of micro-water control and the difficulty of manufacturing.

The hollow insulating tube may be made of an insulating material having a water vapor transmission rate less than <NUM>/m<NUM>·d at a temperature of <NUM> and a relative humidity of <NUM>%RH.

Through making the hollow insulating tube of the insulating material having the water vapor transmission rate of <NUM>/m<NUM>·d at the temperature of <NUM> and the relative humidity of <NUM>%RH, it is verified by micro-water experiments that micro-water control indicators can be met, and water vapor content is low.

In an embodiment, the gas is dried high-purity nitrogen, air or sulfur hexafluoride gas.

Each of the high-purity nitrogen, air and sulfur hexafluoride gas has a good insulation property, is economical and practical, and contributes to reduce the manufacturing cost of the post insulator while ensuring the internal insulation property of the post insulator.

The upper flange and/or the lower flange are provided with a self-sealing valve. The self-sealing valve is configured to backfill the gas after vacuuming.

Providing the self-sealing valve on the upper flange and/or the lower flange facilitates controlling the extraction and filling of the gas, and does not affect the electrical field inside the insulating tube. Moreover, the self-sealing valve is also used for leak detection and micro-water detection test in the factory.

The lower flange includes a base configured to seal the hollow insulating tube and a flange tube fixed to a wall of the hollow insulating tube. The base or the flange tube is provided with the self-sealing valve.

The self-sealing valve is positioned on the base. The base is recessed toward an interior of the insulating tube, such that an opening of the self-sealing valve is positioned inside a recess.

Positioning the opening of the self-sealing valve in the recess is convenient for the connection of a plurality of post insulators.

In an embodiment, the upper flange and/or the lower flange are provided with a drying device. The drying device is positioned inside the hollow insulating tube.

Providing the drying device inside the hollow insulating tube can keep the gas inside the insulating tube dry, and it is not easy to accumulate micro-water inside the insulating tube, thereby avoiding the problem of flashover inside the insulating tube.

In an embodiment, the drying device includes a cage-shaped desiccant box and desiccant placed in the desiccant box.

Further, the desiccant box is made of a conductive material, and is provided with a plurality of uniformly distributed through holes.

The cage-shaped desiccant box made of the conductive material and provided with the plurality of through holes can form a shielding cage structure. The principle of shielding cage can be used to ensure that the drying device will not affect an electric field inside the insulating tube.

Further, the desiccant is molecular sieve desiccant.

Another object of the present disclosure is to provide an insulated support post. The insulated support post can the provide insulation support for large electrical equipment. It can not only effectively solve the interface problem caused by filling solid material in the insulated support post, but also solve the gas leakage problem caused by filling high-pressure gas in the insulated support post, thereby avoiding detection and maintenance. Meanwhile, it can provide a large margin for micro-water control, and reduce the difficulty of micro-water control and manufacturing.

For achieving the above object, the present disclosure adopts the following technical solution, that is, an insulated support post includes two post insulators according to any post insulator as described above, the two post insulators being connected end to end.

In an embodiment, a sealing gasket is provided between the two post insulators.

Providing the sealing gasket between the two connected post insulators further ensures the sealing performance and reliability of the connection between the post insulators.

As required, embodiments of the present disclosure are disclosed. However, it should be understood that the embodiments disclosed herein are merely typical examples of the present disclosure.

As shown in <FIG>, a post insulator <NUM> in this embodiment includes a hollow insulating tube <NUM>, a shed <NUM> positioned on a periphery of the hollow insulating tube <NUM>, and an upper flange <NUM> and a lower flange <NUM> provided at both ends of the hollow insulating tube <NUM>. Gas is sealed inside the hollow insulating tube <NUM>, and the gas has an absolute pressure in a range of <NUM> MPa to <NUM> MPa.

The absolute pressure of the gas in the post insulator <NUM> is set to <NUM>. 1MPa to <NUM>. The gas in the hollow insulating tube <NUM> is in a normal pressure state, and thus the gas is not easy to leak from the hollow insulating tube <NUM>, so that the daily maintenance and inspection of the post insulator <NUM> is avoided. Setting the gas in the hollow insulating tube <NUM> to be in a normal pressure state can also meet a pressure difference between different regions and between altitudes, so as to ensure that the gas inside the hollow insulating tube <NUM> is in a non-negative pressure state when used in different regions. Furthermore, the hollow insulating tube <NUM> with a normal pressure inside has a large margin for micro-water control, which effectively reduces the difficulty of micro-water control and the difficulty of manufacturing.

It should be noted that, in this embodiment, the upper flange <NUM> and the lower flange <NUM> have the same structure. The upper flange <NUM> and the lower flange <NUM> are relative terms with regard to position, and no absolute limitation is made herein. The position and name of the upper flange and the lower flange can be adjusted according to actual needs.

The hollow insulating tube <NUM> may be made of an insulating material having a water vapor transmission rate less than <NUM>/m<NUM>·d at a temperature of <NUM> and a relative humidity of <NUM>%RH.

In this embodiment, the hollow insulating tube is formed by winding an insulating material having the water vapor transmission rate of <NUM>/m<NUM>·d at the temperature of <NUM> and the relative humidity of <NUM>%RH. It is verified by micro-water experiments that the hollow insulating tube <NUM> has low water vapor content, and micro-water control indicators can be met.

It should be noted that, in other embodiments, the hollow insulating tube may also be made of an insulating material having a water vapor transmission rate less than <NUM>/m<NUM>·d. The process of forming hollow insulating tube is not limited to the winding process.

The gas may be dried high-purity nitrogen, air or sulfur hexafluoride gas.

In this embodiment, the gas is dried high-purity nitrogen. High-purity nitrogen is a gas with a nitrogen content of <NUM>%. The absolute pressure of the high-purity nitrogen in the hollow insulating tube <NUM> is controlled to <NUM> MPa, that is, one atmosphere.

High-purity nitrogen is an inert gas, used to fill the hollow insulating tube <NUM>, and has the advantages of good insulation property, good stability, economy, practicality, and the like. The absolute pressure of the high-purity nitrogen in the hollow insulating tube <NUM> is controlled to one atmosphere, which is the same as the external pressure of the hollow insulating tube <NUM>. In this way, it can effectively avoid the possibility of gas leakage.

It should be noted that, in other embodiments, the gas may also be air or sulfur hexafluoride gas, as long as the absolute pressure of the gas inside the insulating tube is in a range of <NUM> MPa to <NUM> MPa.

The upper flange <NUM> and/or the lower flange <NUM> may be provided with a self-sealing valve <NUM>, which is used to backfill the gas after vacuuming.

In this embodiment, the lower flange <NUM> is provided with a self-sealing valve <NUM>, such that it is convenient to control the extraction and filling of the gas. The self-sealing valve <NUM> can also be used for product leak detection and micro-water detection test in the factory.

It should be noted that, in other embodiments, the self-sealing valve may also be provided on the upper flange, or provided on both the upper flange and the lower flange. The number of self-sealing valves may also be more than one, and the position and number of self-sealing valves can be provided according to actual needs.

The lower flange <NUM> may include a base <NUM> and a flange tube <NUM>. The base <NUM> is used to seal the hollow insulating tube <NUM>. The flange tube <NUM> is fixed to a wall of the hollow insulating tube <NUM>. The base <NUM> or the flange tube <NUM> may be provided with the self-sealing valve <NUM>.

In this embodiment, the flange tube <NUM> of the lower flange <NUM> is perpendicular to the base <NUM>. The base <NUM> closes an end surface of the hollow insulating tube <NUM>. The flange tube <NUM> is connected to the wall of the hollow insulating tube <NUM>. The self-sealing valve <NUM> is provided on the base <NUM>. The upper flange <NUM> and the lower flange <NUM> have the same structure.

It should be noted that, in other embodiments, the self-sealing valve may also be provided on the flange tube. It is conceivable that when more than one self-sealing valve is provided on the post insulator, both the base and the flange tube can be provided with the self-sealing valve, or all the self-sealing valves are provided on the base.

The self-sealing valve <NUM> is positioned on the base <NUM>. The base <NUM> is recessed toward an interior of the hollow insulating tube <NUM>, such that an opening <NUM> of the self-sealing valve <NUM> is positioned inside a recess.

The base <NUM> has a recess toward the interior of the hollow insulating tube <NUM>. A height of the recess in a longitudinal direction is less than a height of the flange tube <NUM>. A diameter of the recess in a transverse direction is less than a diameter of the hollow insulating tube <NUM>.

The self-sealing valve <NUM> is provided on the recess of the base <NUM>. Specifically, a connecting hole <NUM> is provided on the base <NUM>. A connecting end <NUM> of the self-sealing valve is threadedly connected to the connecting hole <NUM> (not illustrated). Sealant (not illustrated) is provided between the connecting end <NUM> and the connecting hole <NUM>.

The self-sealing valve <NUM> is provided in the recess, and the opening <NUM> is positioned inside the recess, such that when two post insulators <NUM> are connected to each other, the self-sealing valve <NUM> on the lower flange <NUM> will not affect the connection between the two post insulators <NUM>.

It should be noted that, in other embodiments, a size of the recess on the base may not be limited thereto. In examples not forming part of the current invention, the base may be provided with no recess, and the self-sealing valve is directly positioned on the base. The connection between the self-sealing valve and the base is not limited to the threaded hole connection, and other connection methods such as welding, interference fit and the like may be adopted.

A drying device <NUM> may be provided on the upper flange <NUM> and/or the lower flange <NUM>. The drying device <NUM> may be positioned inside the hollow insulating tube <NUM>.

In this embodiment, the drying device <NUM> is provided on the lower flange <NUM>, and the drying device <NUM> is positioned inside the hollow insulating tube <NUM>. Specifically, the drying device <NUM> is provided inside the hollow insulating tube <NUM> at a protruding portion corresponding to the recess of the base <NUM>.

It should be noted that, in other embodiments, the drying device may not be provided on the protruding portion corresponding to the recess, but on a portion of the base that is not recessed. More than one drying device may be provided. The drying device may also be provided on the upper flange, or when a plurality of drying devices are provided, the drying devices can be provided on both the upper flange and the lower flange.

As shown in <FIG>, a post insulator <NUM> in this embodiment has a similar structure to that of the post insulator <NUM> in the first post insulator embodiment of the present disclosure. The same structure of the post insulator <NUM> as the post insulator <NUM> will not be repeated herein. The post insulator <NUM> differs from the post insulator <NUM> in that filled gas and absolute pressure inside the post insulator <NUM> in this embodiment is different from those of the post insulator <NUM>. A drying device <NUM> is provided on an upper flange <NUM>.

In this embodiment, the gas is dried air. The absolute pressure in a hollow insulating tube <NUM> is controlled to <NUM> MPa.

The air has good stability, is economic and practical, and is filled inside the hollow insulating tube <NUM>. The absolute pressure is controlled to <NUM> atmospheres, thereby effectively avoiding the gas leakage. In addition, the gas with slightly positive pressure can also adapt to the pressure difference between different regions and between altitudes, so as to ensure that a non-negative pressure is always maintained in the hollow insulating tube <NUM> in different regions.

It should be noted that, in this embodiment, the gas may also be sulfur hexafluoride gas, as long as the absolute pressure of the gas inside the insulating tube is in a range of <NUM> MPa to <NUM> MPa.

The upper flange <NUM> and/or a lower flange <NUM> may be provided with the drying device <NUM>. The drying device <NUM> may be positioned inside the hollow insulating tube <NUM>.

In this embodiment, one drying device <NUM> is provided on the upper flange <NUM>. Specifically, the upper flange <NUM> and the lower flange <NUM> have the same structure. The upper flange <NUM> includes a base <NUM> and a flange tube <NUM>. The drying device <NUM> is provided on base <NUM>.

It should be noted that, in other embodiments, the drying device may also be provided on the lower flange. More than one drying device may be provided. When a plurality of drying devices is provided, the drying devices can be provided on both the upper flange and the lower flange.

The drying device <NUM> may include a cage-shaped desiccant box <NUM> and desiccant placed in the desiccant box <NUM>.

In this embodiment, as shown in <FIG>, the drying device <NUM> includes the desiccant box <NUM> and desiccant (not illustrated) placed in the desiccant box <NUM>. The desiccant box <NUM> is cage-shaped. The desiccant box <NUM> is upside down on the upper flange <NUM>, and the desiccant is placed in the desiccant box <NUM>.

Specifically, the upper flange <NUM> closes an opening of the desiccant box <NUM>. A height of the drying device <NUM> mounted on the base <NUM> in the longitudinal direction is less than that of the flange tube <NUM>. A connecting lug <NUM> perpendicular to the desiccant box <NUM> extends from the opening of the desiccant box <NUM>. A number of connecting holes <NUM> is provided on the connecting lug <NUM>. The connecting hole <NUM> is used for fixed connection with the base <NUM> of the upper flange <NUM>.

It should be noted that, in other embodiments, the drying device may also be fixed on the upper flange <NUM> in other ways, which are not limited to the connection method in this embodiment.

The desiccant box <NUM> may be made of a conductive material, and may be provided with a plurality of uniformly distributed through holes <NUM>.

In this embodiment, the desiccant box <NUM> is made of metal material, and is provided with the plurality of uniformly distributed through holes <NUM> having uniform size.

The desiccant box <NUM> is cage-shaped, and provided with the plurality of uniformly distributed through holes <NUM> having a uniform size, thereby forming a shielding cage. Therefore, the principle of shielding cage is used to ensure that the desiccant box <NUM> will not affect an electric field inside the hollow insulating tube <NUM>.

It should be noted that, in other embodiments, the conductive material and shape of the desiccant box are not limited thereto, and the distribution and size of the through holes are not limited thereto, as long as the requirements of the shielding cage can be met. A height of the drying device is not limited to be less than a height of the flange tube, and may also be slightly higher than that of the flange tube, as long as the principle of the shielding cage can be met by the drying device, that is, the drying device will not affect the electric field inside the hollow insulating tube.

The desiccant may be molecular sieve desiccant.

It should be noted that, in other embodiments, the desiccant may also be other types of desiccant.

First Post Insulator Illustrative Example not covered by the subject-matter of the claims.

As shown in <FIG>, a post insulator <NUM> has a similar structure to that of the post insulator <NUM> in the first post insulator embodiment of the present disclosure. A drying device <NUM> in this example has the same structure as the drying device <NUM> in the second embodiment. The same structure of the post insulator <NUM> as the post insulator <NUM> will not be repeated herein. The post insulator <NUM> differs from the post insulators in the first and second embodiments in that a hollow insulating tube <NUM> in this embodiment is filled with <NUM> MPa sulfur hexafluoride gas. A self-sealing valve <NUM> and the drying device <NUM> are both provided on an upper flange <NUM>.

In this example, the gas is dried sulfur hexafluoride gas. The absolute pressure inside the hollow insulating tube <NUM> is controlled to <NUM>.

The upper flange <NUM> and/or a lower flange <NUM> may be provided with a self-sealing valve <NUM>, which is used to backfill the gas after vacuuming.

In this Figure, the self-sealing valve <NUM> is provided on the upper flange <NUM>.

In the claimed invention, the he lower flange <NUM> includes a base and a flange tube. The base is used to seal the hollow insulating tube <NUM>. The flange tube is fixed to a wall of the hollow insulating tube <NUM>. The self-sealing valve is provided on the base.

In this example, the upper flange <NUM> and the lower flange <NUM> have the same structure. Therefore, the upper flange <NUM> includes a base <NUM> and a flange tube <NUM>. The flange tube <NUM> is perpendicular to the base <NUM>. The base <NUM> closes an end surface of the hollow insulating tube <NUM>. The flange tube <NUM> is connected to the wall of the hollow insulating tube <NUM>. The self-sealing valve <NUM> is provided on the base <NUM>.

It should be noted that, in other examples, a different self-sealing valve may also be provided on the flange tube. The number of self-sealing valves is not limited to one. When more than one self-sealing valve is provided, the self-sealing valves may also be provided on both the flange tube and the base. The position of the self-sealing valve can be set according to actual needs.

The self-sealing valve is positioned on the base. The base is recessed toward an interior of the hollow insulating tube <NUM>, such that an opening of the self-sealing valve is positioned inside a recess.

The self-sealing valve <NUM> is positioned on the base <NUM>. The base <NUM> is recessed toward an interior of the hollow insulating tube <NUM>, such that an opening of the self-sealing valve <NUM> is positioned inside a recess.

The base <NUM> is provided with the recess. A height of the recess in the longitudinal direction is less than a height of the flange tube <NUM>. A diameter of the recess in the transverse direction is less than a diameter of the base <NUM>.

The opening of the self-sealing valve <NUM> is positioned inside the recess. When two post insulators <NUM> are connected, the self-sealing valve <NUM> positioned inside the recess will not affect the connection between the post insulators <NUM>.

The upper flange <NUM> and/or the lower flange <NUM> may be provided with the drying device <NUM>, and the drying device <NUM> may be positioned inside the hollow insulating tube <NUM>.

In this example, one drying device <NUM> is provided on the upper flange <NUM>, and the drying device <NUM> is positioned inside the hollow insulating tube <NUM>. Specifically, the drying device <NUM> is provided at a protruding portion corresponding to the recess of the base <NUM>.

It should be noted that, in other examples, the drying device may not be provided on the protruding portion corresponding to the recess, but on a portion of the base that is not recessed. More than one drying device may be provided. The drying devices may be provided on both the upper flange and the lower flange, and detailed description thereof will not be made herein.

Second Post Insulator Illustrative Example not covered by the subject-matter of the claims.

As shown in <FIG>, a post insulator <NUM> has a similar structure to that of the post insulator <NUM> in <FIG> of the present disclosure. A drying device <NUM> in this example has the same structure as the drying device <NUM> in the second post insulator embodiment of the present disclosure. The same structure of the post insulator <NUM> as the post insulator <NUM> will not be repeated herein. The post insulator <NUM> differs from the post insulators <NUM> in that the drying device <NUM> in this example is provided on a lower flange <NUM>.

The drying device <NUM> may be provided on an upper flange <NUM> and/or the lower flange <NUM>. The drying device <NUM> may be positioned inside a hollow insulating tube <NUM>.

In this example, the drying device <NUM> is positioned on the lower flange <NUM>.

The drying device <NUM> may be provided on the upper flange <NUM> and/or the lower flange <NUM>. The drying device <NUM> may be positioned inside the hollow insulating tube <NUM>.

In this example, one drying device <NUM> is provided on the lower flange <NUM>, and the drying device <NUM> is provided in the hollow insulating tube <NUM>. Specifically, the drying device <NUM> is provided on a base <NUM>.

It should be noted that in other examples, the number of drying devices is not limited to one, and drying devices may also be provided on both the upper flange and the lower flange to meet actual needs.

As shown in <FIG>, a post insulator <NUM> in this embodiment has a similar structure to that of the post insulator <NUM> in the first post insulator embodiment of the present disclosure. The same structure of the post insulator <NUM> as the post insulator <NUM> will not be repeated herein. The post insulator <NUM> differs from the post insulators <NUM> in that an upper flange <NUM> is further provided with a drying device <NUM> in this embodiment.

The drying device <NUM> may be provided on the upper flange <NUM> and/or a lower flange <NUM>, and the drying device <NUM> may be positioned inside a hollow insulating tube <NUM>.

In this embodiment, one drying device <NUM> is provided on the lower flange <NUM>, and the drying device <NUM> is positioned inside the hollow insulating tube <NUM>. Another drying device <NUM> is further provided on the upper flange <NUM>. Specifically, the drying device <NUM> is provided on a base <NUM>, and the drying device <NUM> is positioned in the hollow insulating tube <NUM>.

It should be noted that in other embodiments, the number of drying devices may be more than two, which can be set according to the actual size and needs of the post insulator.

As shown in <FIG>, a post insulator <NUM> in this embodiment has a similar structure to that of the post insulator <NUM> in the second post insulator embodiment of the present disclosure. The same structure of the post insulator <NUM> as the post insulator <NUM> will not be repeated herein. The post insulator <NUM> differs from the post insulators <NUM> in that an upper flange <NUM> is further provided with a self-sealing valve <NUM> in this embodiment.

The self-sealing valve <NUM> is provided on the lower flange <NUM>, and the self-sealing valve <NUM> may be used to backfill the gas after vacuuming.

In this embodiment, one self-sealing valve <NUM> is provided on the upper flange <NUM>, and another self-sealing valve <NUM> is provided on the lower flange <NUM>.

The lower flange <NUM> may include a base and a flange tube. The base is used to seal a hollow insulating tube <NUM>. The flange tube is fixed to a wall of the hollow insulating tube <NUM>. The base or the flange tube may be provided with the self-sealing valve <NUM>.

The self-sealing valve <NUM> is positioned on the base. The base is recessed toward an interior of the hollow insulating tube <NUM>, such that an opening of the self-sealing valve is positioned inside a recess.

In this embodiment, the upper flange <NUM> and the lower flange <NUM> have the same structure. Therefore, the upper flange <NUM> includes a base <NUM> and a flange tube <NUM>. The flange tube <NUM> is perpendicular to the base <NUM>. The base <NUM> closes an end surface of the hollow insulating tube <NUM>. The flange tube <NUM> is connected to the wall of the hollow insulating tube <NUM>. The base <NUM> is provided with the self-sealing valve <NUM>.

Furthermore, the self-sealing valve <NUM> is positioned on the base <NUM>, and the base <NUM> is recessed toward an interior of the hollow insulating tube <NUM>, such that an opening of the self-sealing valve <NUM> is positioned inside a recess.

In this embodiment, the recess is formed on the base <NUM>. A height of the recess in the longitudinal direction is less than a height of the flange tube <NUM>. A diameter of the recess in the transverse direction is slightly less than a diameter of the base <NUM>.

The opening of the self-sealing valve <NUM> is positioned inside the recess, such that when two post insulators <NUM> are connected, the self-sealing valve <NUM> on the upper flange <NUM> is prevented from affecting the connection between the post insulators.

As shown in <FIG>, a post insulator <NUM> in this example has a similar structure to that of the post insulator <NUM> in the first post insulator example of the present disclosure. The same structure of the post insulator <NUM> as the post insulator <NUM> will not be repeated herein. The post insulator <NUM> differs from the post insulator <NUM> in that a self-sealing valve <NUM> is provided on a flange tube <NUM> of a lower flange <NUM> in this example.

The self-sealing valve <NUM> may be positioned on the flange tube <NUM>. The flange tube <NUM> may be in a communication with a hollow insulating tube <NUM> via a base <NUM>.

In this example, the lower flange <NUM> includes the base <NUM> and the flange tube <NUM>. The self-sealing valve <NUM> is provided on the flange tube <NUM> at an angle of <NUM> degrees to the longitudinal direction.

An opening <NUM> of the self-sealing valve <NUM> is provided outside the post insulator <NUM>. The flange tube <NUM> is provided with a threaded hole <NUM>. A connecting end <NUM> of the self-sealing valve <NUM> is threadedly connected to the threaded hole <NUM>. The base <NUM> is provided with a hole <NUM> communicating the interior of the hollow insulating tube <NUM> with the threaded hole <NUM>. The threaded hole <NUM> and the hole <NUM> are provided at an angle.

The self-sealing valve <NUM> is provided on the flange tube <NUM>, and thus when a plurality of post insulators <NUM> is connected, the gas extraction and filling will not be affected. The threaded hole <NUM> is provided on the flange tube <NUM>, and the hole <NUM> provided at an angle to the threaded hole <NUM> is provided on the base <NUM>, so as to communicate the self-sealing valve <NUM> with the interior of the hollow insulating tube <NUM>.

If the self-sealing valve <NUM> is directly connected to the interior of the hollow insulating tube <NUM> from the flange tube <NUM>, wall thickness and height of the flange tube <NUM> need to be increased, thereby increasing the weight and cost of the flange <NUM>. In this embodiment, the self-sealing valve <NUM> is in communication with the hollow insulating tube <NUM> through the threaded hole <NUM> and the hole <NUM> that are communicated at an angle, thereby effectively reducing the weight of the flange <NUM> and reducing the cost.

It should be noted that in other examples, the number of self-sealing valves is not limited to one. Naturally, according to actual needs, self-sealing valves may be provided on both the base and the flange tube.

As shown in <FIG>, an insulated support post <NUM> in this embodiment includes two post insulators <NUM> and <NUM> connected end to end. The post insulators <NUM> and <NUM> are post insulators in the aforementioned post insulator embodiments.

In this embodiment, the post insulators disclosed in the aforementioned post insulator embodiments are connected end to end to form the insulated support post <NUM>, which can provide reliable insulation support for large electrical equipment. The interface problem caused by filling solid in the insulated support post is effectively solved. Moreover, the gas leakage problem caused by filling high-pressure gas in the insulated support post can be solved, thereby avoiding detection and maintenance. Meanwhile, it can provide a large margin for micro-water control, and reduce the difficulty of micro-water control and manufacturing.

In this embodiment, the post insulator <NUM> has the same structure as the post insulator <NUM> disclosed in the first post insulator embodiment of the present disclosure. The post insulator <NUM> has the same structure as the post insulator <NUM> disclosed in the second post insulator illustrative example of the present disclosure. The same structure of the post insulators <NUM> and <NUM> as the post insulators <NUM> and <NUM> will not be repeated herein.

The post insulator <NUM> and the post insulator <NUM> are post insulators with the same specification. A lower flange <NUM> of the post insulator <NUM> is connected to an upper flange <NUM> of the post insulator <NUM> correspondingly. Specifically, the lower flange <NUM> and the upper flange <NUM> are fixedly connected through bolts <NUM>.

A sealing gasket <NUM> may be provided between the two post insulators <NUM> and <NUM>.

In this embodiment, a base <NUM> of the lower flange <NUM> is attached to a base <NUM> of the upper flange <NUM>, and the sealing gasket <NUM> is provided between the base <NUM> and the base <NUM>.

Through providing the sealing gasket <NUM> between the base <NUM> and the base <NUM>, the sealing performance of the connection between the lower flange <NUM> and the upper flange <NUM> can be improved, thereby further ensuring that the insulated support post <NUM> has a good gas sealing performance.

It should be noted that, in other embodiments, the post insulator of the insulated support post may also be selected from the post insulators in the other post insulator embodiments of the present disclosure. The two post insulators of the insulated support post may be the post insulators disclosed in the same insulator embodiment, or the post insulators disclosed in the different insulator embodiments.

First Insulated Support Post Illustrative Example not covered by the subject matter of the claims.

As shown in <FIG>, an insulated support post <NUM> in this example has similar structure to that of the insulated support post <NUM> in the first insulated support post embodiment. The same structure of the insulated support post <NUM> as the insulated support post <NUM> will not be repeated herein. The insulated support post <NUM> differs from the insulated support post <NUM> in that a post insulator <NUM> has a same structure as the post insulator <NUM> in the third post insulator illustrative example. A post insulator <NUM> has a same structure as the post insulator <NUM>.

In this example, the post insulator <NUM> and the post insulator <NUM> have the same structure, and both the post insulator <NUM> and the post insulator <NUM> have the same structure as the post insulator <NUM> in the fourth post insulator illustrative example. Specifically, a lower flange <NUM> of the post insulator <NUM> is connected to an upper flange <NUM> of the post insulator <NUM>.

A self-sealing valve <NUM> of the post insulator <NUM> is provided on a flange tube of the lower flange <NUM>. A self-sealing valve <NUM> of the post insulator <NUM> is provided on a flange tube of the lower flange <NUM>. When the post insulator <NUM> is connected to the post insulator <NUM>, the self-sealing valve <NUM> and the self-sealing valve <NUM> can still extract gas from an interior of the hollow insulating tube and fill the interior of the hollow insulating tube with the gas, which will not be affected by a structure for connecting the post insulator <NUM> and the post insulator <NUM>, thereby improving the practicability.

Claim 1:
A post insulator (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>), comprising:
a hollow insulating tube (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>);
a shed (<NUM>) positioned on a periphery of the hollow insulating tube (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>); and
an upper flange (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) and a lower flange (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>) provided at both ends of the hollow insulating tube (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>),
wherein gas is sealed inside the hollow insulating tube (<NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>, <NUM>), and the gas has an absolute pressure in a range of <NUM> MPa to <NUM> Mpa;
characterized in that the lower flange (<NUM>, <NUM>, <NUM>) is provided with a self-sealing valve (<NUM>, <NUM>, <NUM>), and the self-sealing valve (<NUM>, <NUM>, <NUM>) is configured to backfill the gas after vacuuming;
the lower flange (<NUM>, <NUM>, <NUM>) comprises a base (<NUM>, <NUM>) configured to seal the hollow insulating tube (<NUM>, <NUM>, <NUM>) and a flange tube (<NUM>, <NUM>) fixed to a wall of the hollow insulating tube (<NUM>, <NUM>, <NUM>);
the self-sealing valve (<NUM>, <NUM>) is positioned on the base (<NUM>), and the base (<NUM>) is recessed toward an interior of the insulating tube (<NUM>, <NUM>), and an opening of the self-sealing valve (<NUM>, <NUM>) is positioned inside a recess; and
sealant is provided between a connecting end (<NUM>, <NUM>) of the self-sealing valve (<NUM>, <NUM>, <NUM>, <NUM>) and a connecting hole (<NUM>) provided on the base (<NUM>, <NUM>).