CN210516349U

CN210516349U - Hollow post insulator

Info

Publication number: CN210516349U
Application number: CN201921369392.3U
Authority: CN
Inventors: 马斌; 张俊杰; 倪桂炎; 张瑞敏
Original assignee: Jiangsu Shenma Electric Power Co Ltd
Current assignee: Jiangsu Shenma Electric Power Co Ltd
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2020-05-12
Anticipated expiration: 2029-08-21

Abstract

The application discloses hollow post insulator, including hollow insulating tube, the cladding is fixed in the peripheral full skirt of hollow insulating tube outside, cup joints the flange at hollow insulating tube both ends, and the flange includes ring flange and a flange section of thick bamboo, and hollow insulating tube both ends inner wall is the toper, sets up tip seal structure in the hollow insulating tube, and tip seal structure sealing connection hollow insulating tube and flange, tip seal structure highly be higher than cup joint in the height of the outside flange section of thick bamboo of hollow insulating tube. Hollow post insulator in this application adopts both ends to be conical hollow insulating tube, combines tip seal structure to carry out the shutoff, strengthens sealed effect, and sets up automatic plugging device at a tip of hollow insulating tube, can be convenient for fill the gassing operation, still sets up the portion of holding in tip seal structure and is used for the holding drier, can guarantee that the interior insulating effect of insulator is guaranteed to little water content of insulating tube keeps under the standard value.

Description

Hollow post insulator

Technical Field

The application relates to equipment for power transmission and transformation in the power industry, in particular to a hollow post insulator.

Background

At present, composite insulators are mainly divided into two types, one is a hollow composite insulator, the other is a post composite insulator, and a conventional post composite insulator is of a solid structure. However, the solid post composite insulator is heavy and is not easy to transport and install.

For this reason, the skilled person proposes a hollow post insulator, but a purely hollow post insulator is to be reinforced in terms of mechanical strength and overall sealing performance. In addition, generally, a drying device needs to be added to the inflatable insulator to improve the drying degree of the interior of the inflatable insulator, but the conventional drying device is of a metal sieve-shaped structure, so that the cost is high while the internal insulation distance is reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a hollow post insulator having high mechanical strength and good sealing performance. The application provides a hollow post insulator, including hollow insulating tube, the cladding is fixed in the peripheral full skirt of hollow insulating tube outside, cup joints in the flange at hollow insulating tube both ends, and the flange includes ring flange and a flange section of thick bamboo, and hollow insulating tube both ends inner wall is the toper, sets up tip seal structure in the hollow insulating tube, and tip seal structure sealing connection hollow insulating tube and flange, tip seal structure highly be higher than cup joint in the height of the outside flange section of thick bamboo of hollow insulating tube.

Further, the end sealing structure is arranged at the end of the hollow insulating pipe, an annular groove is formed between the end sealing structure and the flange, the hollow insulating pipe is sleeved in the annular groove, and the hollow insulating pipe is connected with the annular groove in a sealing mode.

Further, the end sealing structure is made of reinforced composite materials, and the reinforced composite materials fill the two ends of the hollow insulating pipe.

Further, the end seal structure is integrally formed with the flange.

Further, the inner diameters of the two ends of the hollow insulating pipe are gradually reduced along the direction far away from the flange, and a sealing ring is arranged between the end sealing structure and the hollow insulating pipe.

Furthermore, the hollow post insulator is filled with dry gas, and the absolute pressure of the gas is 0.1-0.15 MPa.

Furthermore, a first through hole and a second through hole are respectively arranged in the flange plate and the end sealing structure, the first through hole and the second through hole are communicated with the inner space of the hollow insulating tube, an air charging and discharging device is arranged in the first through hole, and a sealing material is used for sealing and filling a gap between the first through hole and the air charging and discharging device.

Further, the hollow pillar insulator is provided with an automatic plugging device, the automatic plugging device comprises a plugging piece and a self-pressing spring, and the plugging piece is locked and fixed on the surface of the end sealing structure through the self-pressing spring and seals the second through hole.

Further, the plugging piece comprises a sealing piece and a connecting plate, the sealing piece is fixedly connected with the connecting plate, and the self-pressing spring elastically connects the connecting plate and the end sealing structure and enables the sealing piece to be abutted against the second through hole.

Further, the end sealing structure is provided with an accommodating part for accommodating a drying agent.

The beneficial effect of this application is: hollow post insulator in this application, the insulating tube both ends adopt end seal structure to carry out the shutoff, form the recess between end seal structure and the flange and be used for being connected with the hollow insulating tube cooperation, and this structure can strengthen the sealed effect of insulating tube. The end part of the hollow insulating pipe is conical, the sealing surface area between the hollow insulating pipe and the end sealing structure can be increased, and the sealing performance can be further ensured through extrusion between the end part shape and the sealing piece. The hollow post insulator is filled with 0.1-0.15 Mpa of dry gas, the air pressure is 1-1.5 standard atmospheric pressures, the difference with the external air pressure is not large, and the micro-positive pressure state can ensure that the insulator is suitable for various altitudes without negative pressure, thereby reducing the sealing condition and meeting the use requirement. In addition, an automatic plugging device is arranged at one end part of the hollow insulating pipe, and the automatic plugging device is convenient to inflate and deflate and can achieve a strong sealing effect. In order to keep the interior of the hollow post insulator dry, the accommodating part is arranged in the end sealing structure and used for accommodating a drying agent, so that the micro-water content in the insulating pipe can be kept below a standard value, and the internal insulation effect of the insulator is ensured.

Drawings

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

fig. 2 is an enlarged partial cross-sectional view of an insulator according to an embodiment of the present application;

fig. 3 is a schematic partial cross-sectional view of an insulator according to another embodiment of the present application.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1 and 2, an embodiment of the present application provides a hollow post insulator 1000, which includes a hollow insulating tube 1100, a shed 1200 covering and fixed on an outer circumferential surface of the hollow insulating tube 1100, and flanges 1010 sleeved on both ends of the hollow insulating tube 1100, where the flanges 1010 include an upper flange 1300 and a lower flange 1400. An end sealing structure 1020 is arranged in the hollow insulating pipe 1100, the end sealing structure 1020 is arranged at two ends of the hollow insulating pipe 1100, the end sealing structure 1020 comprises an upper end sealing structure 1500 and a lower end sealing structure 1600, the upper end sealing structure 1500 is in sealing connection with the hollow insulating pipe 1100 and the upper flange 1300, and the lower end sealing structure 1600 is in sealing connection with the hollow insulating pipe 1100 and the lower flange 1400. It should be noted that the distinction between the upper and lower flanges and the upper and lower end seal structures is made herein for clarity, and the upper and lower are relative concepts and alternatives may be substituted depending on the actual situation without absolute limitation.

The height of the end sealing structure 1020 is higher than that of the corresponding flange barrel 1012 sleeved outside the hollow insulating pipe 1100, so that the end sealing structure 1020 can play a certain mechanical role, the mechanical strength of the hollow post insulator 1000 is improved, and meanwhile, water vapor can be prevented from permeating into the hollow insulating pipe 1100 from the position where the flange 1010 is connected with the hollow insulating pipe 1100 through the inner wall of the hollow insulating pipe 1100, and the sealing performance is further improved. The inner walls at the two ends of the hollow insulating tube 1100 are conical, the openings at the two ends of the hollow insulating tube 1100 are large, the inner diameters at the two ends of the hollow insulating tube 1100 are gradually reduced along the direction away from the flange 1010, namely, the lower end sealing structure 1600 is of a trapezoidal structure, and the upper end sealing structure 1500 is of an inverted trapezoidal structure. This structure can increase the contact surface between end seal structure 1020 and the hollow insulating tube 1100, and simultaneously under the extrusion of flange 1010, the trapezoidal space of big-end-in-small outside is favorable to the inseparable laminating between end seal structure 1020 and the hollow insulating tube 1100 to more be favorable to the sealed of hollow insulating tube 1100, still be favorable to the preparation of hollow insulating tube 1100 simultaneously. To facilitate installation of the end seal 1020, the length of the tapered end of the hollow insulated pipe 1100 needs to be comparable to the height of the end seal 1020 in order to avoid mechanical damage to the hollow insulated pipe 1100 during installation due to dimensional mismatch. Of course, in other embodiments, the inner diameter of the end of the hollow insulating tube 1100 may gradually increase along the direction from the end to the center of the hollow insulating tube 1100, that is, the lower end sealing structure 1600 has an inverted trapezoid structure, and the upper end sealing structure 1500 has a trapezoid structure, which is not limited herein.

The end sealing structure 1020 is made of a reinforced composite material, the reinforced composite material is a glass fiber impregnated resin material, the material of the reinforced composite material is the same as that of the hollow insulating tube 1100, the reinforced composite material and the hollow insulating tube are good in compatibility, integrity after cementing is high, sealing effect is good, and therefore reliability of the hollow pillar insulator 1000 is improved. Of course, in other embodiments, the end seal structure 1020 may be an epoxy material, or may also be a silicone rubber material, as long as sealing is achieved. The two ends of the reinforced composite material filled hollow insulating pipe 1100 form an end sealing structure 1020, a sealing groove 1021 is arranged on a contact surface between the end sealing structure 1020 and the hollow insulating pipe 1100, the sealing groove 1021 can be a square groove, an oval groove or an annular groove, and the like, as long as the reinforced composite material can be used for placing a sealing ring or performing glue sealing, and two, three or four sealing grooves can be arranged, and the sealing grooves can also be arranged between the end sealing structure 1020 and the flange 1010, and are not specifically limited herein.

The end sealing structure 1020 may be directly molded at the end of the hollow insulating tube 1100 by injection molding, compression molding, or the like, or the end sealing structure 1020 may be pre-molded and then the end sealing structure 1020 may be hermetically attached to the end of the hollow insulating tube 1100 by an adhesive. In order to further enhance the sealing performance of the hollow post insulator 1000, the surface of the hollow insulating tube 1100 in contact with the end sealing structure 1020 is roughened, and the roughened surface can be formed on the inner wall of the hollow insulating tube 1100 and/or the side surface of the end sealing structure 1020 by grinding or molding, so that the sealing connection between the two is more stable.

In other embodiments, as shown in FIG. 3, the end seal structure 1020 may also be integrally formed with the flange 1010. The end sealing structure 1020 and the flange 1010 are integrally formed, an annular groove 1022 is formed between the end sealing structure and the flange 1010, and the hollow insulating pipe 1100 is inserted into the annular groove 1022. The hollow insulating pipe 1100 is connected with the end sealing structure 1020 and the flange 1010 in a sealing mode, and sealing grooves 1021 are formed in the contact surface of the hollow insulating pipe 1100 and the end sealing structure 1020 and the contact surface of the hollow insulating pipe 1100 and the flange 1010. The end sealing structure 1020 and the flange 1010 may be made of a metal material, or may be made of an epoxy glass fiber material, and are not limited herein.

The hollow post insulator 1000 is filled with dry gas, the absolute pressure of the dry gas is 0.1-0.15 Mpa, namely the pressure of 1-1.5 standard atmospheric pressures, which is not much different from the external atmospheric pressure, and the micro-positive pressure state can make the insulator suitable for various altitudes, and the negative pressure condition can not occur, so that the use requirement can be met while the sealing condition is reduced.

As shown in fig. 2, the upper flange 1300 includes an upper flange 1310, a first through hole 1311 is formed in the center of the upper flange 1310, the first through hole 1311 is used for disposing the inflation/deflation device 1700, and when the thickness of the flange 1310 is sufficient, the inflation/deflation device 1700 can be completely received in the first through hole 1311. The upper end sealing structure 1500 is provided with a second through hole 1510, the second through hole 1510 is communicated with the first through hole 1311 and the inner space of the hollow insulating tube 1100, and the second through hole 1510 can be used for accommodating an inflating nozzle of the inflating and deflating device 1700 when the second through hole 1510 and the first through hole 1311 are coaxially arranged. In other embodiments, the first through hole 1311 may be disposed at other positions of the upper flange 1310, and the first through hole 1311 and the second through hole 1510 may also be disposed non-coaxially, so that the first through hole 1311, the second through hole 1510 and the inner space of the hollow insulating tube 1100 may be communicated with each other.

In order to save material cost and reduce the thickness of the flange 1310 properly, in order to make the inflation and deflation device 1700 be completely accommodated in the hollow post insulator 1000, a first groove 1511 is disposed on the end surface of the upper end sealing structure 1500 close to the upper flange 1310, the inflation and deflation device 1700 is accommodated in the first groove 1511 and the first through hole 1311, and the first groove 1511 is disposed coaxially with the first through hole 1311 and the second through hole 1510. The outer diameter of the inflation and deflation device 1700 is smaller than the inner diameter of the first groove 1511 and larger than the outer diameter of the second through hole 1510, and a step surface is formed between the second through hole 1510 and the first groove 1511 so that the inflation and deflation device 1700 can be fixed on the step surface. In addition, since the hollow post insulator 1000 has a high requirement for the dryness of the gas therein, the gas charging and discharging device 1700 needs to be hermetically connected to the upper end sealing structure 1500 to prevent gas leakage and to prevent the content of water vapor in the gas charged into the hollow post insulator 1000 from being too high. In other embodiments, the first groove 1511, the first through hole 1311 and the second through hole 1510 may not be coaxially disposed, so that they are communicated with each other.

In order to fix the inflation and deflation device 1700 while sealing the first through hole 1311, the first groove 1511 and the second through hole 1510, a sealant (not shown) is filled in a gap between the inflation and deflation device 1700 and the first through hole 1311, the first groove 1511 and the second through hole 1510. In order to make the post insulator 1000 stackable for use, the air inflation/deflation device 1700 may be completely inserted into the space formed by the first through hole 1311 and the first groove 1511, and when sealing is performed, the first through hole 1311 and the first groove 1511 are filled with a sealant so that the sealing surface is flush with the bottom surface of the flange 1310. Of course, in order to improve the sealing performance better, the edge of the first through hole 1311 may be covered with a sealant to prevent moisture from entering the hollow post insulator 1000 along the gap between the interface of the first through hole 1311 and the flange 1010. The sealant can be selected from commonly used sealing materials, such as silicone rubber, polyurethane, polytetrafluoroethylene, etc., and is not limited herein.

In order to facilitate the inflation and deflation operations and to facilitate the detection of the operating conditions of the hollow post insulator 1000, the hollow post insulator 1000 is further provided with an automatic plugging device 1520 for elastically plugging the second through hole 1510. The self-plugging device 1520 includes a plugging member and a self-pressing spring 1522, and the self-pressing spring 1522 elastically fastens the plugging member and the upper end sealing structure 1500. The blocking piece comprises a sealing piece 1521 and a connecting plate 1523, the sealing piece 1521 is fixedly connected to the connecting plate 1523, the sealing piece 1521 does not completely cover the connecting plate 1523, a step surface 15231 is formed between the sealing piece and the connecting plate, at least two self-pressing springs 1522 are arranged on the step surface 15231, and the self-pressing springs 1522 elastically connect the connecting plate 1523 and the upper end sealing structure 1500, so that the sealing piece 1521 is in sealing connection with the second through hole 1510. The sealing element 1521 is made of elastic sealing materials such as silicon rubber and nitrile rubber, and sealing can be better performed by matching with the pressure of the self-pressing spring 1522.

The self-pressing spring 1522 is used as a connecting piece, so that the sealing connection between the sealing piece 1521 and the second through hole 1510 can be conveniently realized, the detection is also convenient, and the gas inside the hollow post insulator 1000 can be conveniently extracted through the automatic plugging device 1520, so that the internal state and the running state of the hollow post insulator can be detected. In other embodiments, the blocking element may only include the sealing element 1521, the connecting plate 1523 is not required, the self-compressing spring 1522 may be directly connected between the sealing element 1521 and the upper end sealing structure 1500, only a step surface is formed on the sealing element 1521, and the self-compressing spring 1522 is connected to the step surface of the sealing element 1521 which is not in direct contact with the upper end sealing structure 1500. The connection mode between the self-pressing spring 1522 and the upper end sealing structure 1500, the connection plate 1523, and the sealing element 1521 may be a common connection mode, and no specific limitation is made herein, and only the elastic sealing connection between the sealing element 1521 and the upper end sealing structure 1500 is required.

To further ensure the sealing performance of the hollow post insulator 1000, the seal 1521 includes an inner seal 15211 and an outer seal 15212. The inner seal 15211 is smaller than the outer seal 15212, that is, a sealing step surface 15213 is formed between the inner seal 15211 and the outer seal 15212, and the sealing step surface 15213 abuts against the upper end sealing structure 1500. The inner sealing member 15211 is a trapezoid structure, which forms a plug structure, the long side of the trapezoid of the inner sealing member 15211 is slightly larger than the outer diameter of the second through hole 1510, the inner sealing member 15211 is further pressed by the self-pressing spring 1522 under the condition of being tightened, and the trapezoid structure can enable the inner sealing member 15211 and the second through hole 1510 to be better sealed. Meanwhile, the sealing member 1521 is made of an elastic sealing material and has a certain compression amount, and the size of the inner sealing member 15211 is slightly larger than that of the second through hole 1510, so that under the action of the self-pressing spring 1522, the inner sealing member 15211 can be completely immersed into the second through hole 1510 and is in tight contact with the inner wall of the second through hole 1510, and thus, the outer sealing member 15212 can be tightly abutted to the upper end sealing structure 1500. The inner seal 15211 and the outer seal 15212 are integrally formed, and therefore sealing of the structure is facilitated. Of course, in other embodiments, the inner seal 15211 and the outer seal 15212 may be two separate structures, and are tightly connected to form a whole by bonding or other methods, which is not limited herein.

Because the inflation and deflation device 1700 is generally small in size, the size of the second through hole 1510 for accommodating the inflation nozzle of the inflation and deflation device 1700 is also small, however, the size matching precision of the sealing element 1521 and the second through hole 1510 affects the sealing effect between the two, and the size control of the small-sized sealing element 1521 is difficult, so in order to facilitate the size control of the sealing element 1521, a second groove 1512 may be provided at one end of the upper end sealing structure 1500 close to the sealing element 1521, and the sealing element 1521 is sealed by the second groove 1512 with a larger size.

In other embodiments, the lower end sealing structure 1600 of the lower flange 1400 may be provided with the inflation/deflation device 1700 and the automatic plugging device 1520, or the upper end sealing structure 1500 and the lower end sealing structure 1600 may be provided with the inflation/deflation device 1700 and the automatic plugging device 1520. The number of the inflation/deflation devices 1700 is not limited to one, and may be plural. The number and location of the inflation and deflation devices 1700 can be determined according to actual requirements.

The lower end sealing structure 1600 has a receiving portion 1630 for receiving a desiccant (not shown) that can absorb moisture in the hollow insulating tube 1100. In this embodiment, the accommodating portion 1630 is provided with a cover 1631 matching with the accommodating portion in size and shape, the desiccant is placed in the accommodating portion 1630, and the cover 1631 is fixed in the accommodating groove 1630 to prevent the spill and the contamination of the inner space of the hollow insulating tube 1100. The cover 1631 is provided with a plurality of ventilation holes to facilitate the exchange of the gas in the containing part 1630 with the gas in the hollow insulating tube 1100, so as to better absorb water vapor. Of course, in other embodiments, an integral block of desiccant may be used, and may be fixed in the accommodating portion 1630 without the aid of a fixing device. For example, the desiccant can be held in the accommodating portion 1630 by interference fit, so that a fixing device is not needed, or the accommodating portion 1630 is configured to have a large space in the middle and small spaces at the two ends, so that the desiccant can be limited in the middle of the accommodating portion 1630. The desiccant may be a molecular sieve desiccant, a calcium chloride desiccant, a silica gel desiccant, a fiber desiccant, etc., and is not particularly limited herein.

In other embodiments, the accommodating portion 1630 and the desiccant may be provided on the upper end sealing structure 1500 of the upper flange 1300. Alternatively, the accommodating portion 1630 and the desiccant are provided in both the upper end sealing structure 1500 and the lower end sealing structure 1600. In addition, the number of the accommodating parts 1630 is not limited to one, and may be multiple, and the position and the number of the accommodating parts 1630 may be determined according to actual requirements.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above examples only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a hollow post insulator, includes hollow insulating tube, the cladding is fixed in the full skirt of hollow insulating tube outer peripheral face cup joints in the flange at hollow insulating tube both ends, the flange includes ring flange and a flange section of thick bamboo, its characterized in that, hollow insulating tube both ends inner wall is the toper, set up tip seal structure in the hollow insulating tube, tip seal structure sealing connection the hollow insulating tube with the flange, tip seal structure highly be higher than cup joint in the hollow insulating tube is outside the height of a flange section of thick bamboo.

2. The hollow post insulator of claim 1, wherein the end sealing structure is disposed at an end of the hollow insulating tube, an annular groove is formed between the end sealing structure and the flange, the hollow insulating tube is sleeved in the annular groove, and the hollow insulating tube is sealingly connected with the annular groove.

3. The hollow post insulator according to claim 1, wherein said end sealing structure is comprised of a reinforced composite material filling both ends of said hollow insulating tube.

4. The hollow post insulator of claim 1, wherein said end seal structure is integrally formed with said flange.

5. The hollow post insulator according to claim 1, wherein the inner diameter of both ends of the hollow insulating tube is gradually reduced in a direction away from the flange, and a seal ring is provided between the end sealing structure and the hollow insulating tube.

6. The hollow post insulator according to claim 1, wherein the hollow post insulator is filled with a dry gas having an absolute pressure of 0.1 to 0.15 Mpa.

7. The hollow post insulator according to claim 1, wherein the flange and the end sealing structure are respectively provided with a first through hole and a second through hole, the first through hole and the second through hole are communicated with the inner space of the hollow insulator, the first through hole is internally provided with an air charging and discharging device, and a sealing material is sealed and filled in a gap between the first through hole and the air charging and discharging device.

8. The hollow post insulator according to claim 7, wherein the hollow post insulator is provided with an automatic plugging device comprising a plugging member and a self-pressing spring, the plugging member being locked to the end sealing structure surface by the self-pressing spring and sealing the second through hole.

9. The hollow post insulator of claim 8, wherein said blocking member includes a sealing member and a connecting plate, said sealing member being fixedly connected to said connecting plate, said self-compressing spring resiliently connecting said connecting plate to said end seal structure and causing said sealing member to abut said second through-hole.

10. The hollow post insulator of claim 1 wherein the end seal structure is provided with a receptacle for receiving a desiccant.