WO2018201927A1

WO2018201927A1 - Insulator

Info

Publication number: WO2018201927A1
Application number: PCT/CN2018/084153
Authority: WO
Inventors: 马斌; 方江; 郁杰
Original assignee: 江苏神马电力股份有限公司
Priority date: 2017-05-04
Filing date: 2018-04-24
Publication date: 2018-11-08
Also published as: CN106992047A; CN106992047B

Abstract

An insulator (1000) comprises an insulating tube (1100) and flanges (100) connected to two ends of the insulating tube. The insulating tube is filled therein with an insulating gas and provided with a drying device. Also disclosed is a composite cross arm comprising the insulator (1000). Compared with traditional insulation solutions, the insulator adopting a gas-filled type internal insulation solution and provided with a drying device has a lighter weight, reduced costs and a longer service life.

Description

Insulator

Technical field

The invention relates to the field of power transmission insulation equipment, in particular to an insulator.

Background technique

The description of this section merely provides background information related to the present disclosure and does not constitute prior art.

At present, insulators have been widely used in the power industry. The traditional internal insulation scheme for insulators is an insulation scheme using oil-filled or filled polyurethane foam, which has the disadvantages of large weight, high cost, shrinkage or expansion in high and low temperature environments.

It should be noted that the above description of the background art is merely for the purpose of facilitating the clearing, complete description of the technical solutions of the present application, and is convenient for understanding by those skilled in the art. The above technical solutions are not considered to be known to those skilled in the art simply because these solutions are set forth in the background of the present application.

Summary of the invention

In view of the deficiencies of the prior art, one of the objects of the present invention is to provide an insulator using an inflatable internal insulation scheme and having a drying device in the insulator.

In order to achieve the above object, the technical means adopted by the present invention are as follows: An insulator includes an insulating tube, and a flange connected to both ends of the insulating tube, the insulating tube is filled with an insulating gas, and a drying device is disposed in the insulating tube.

The above insulator adopts an inflatable internal insulation scheme to reduce the weight of the composite cross arm and save cost; a drying device is arranged in the insulator for absorbing moisture to keep the gas in the insulating tube dry, stable insulation performance and prolonging service life, and the insulator is suitable for UHV Transmission towers and other transmission towers of various voltage levels.

Preferably, the above drying device comprises a desiccant and a desiccant container, the desiccant container is provided with a receiver through hole, the desiccant is placed in the desiccant container; the desiccant is placed in the desiccant container, and the insulating tube is maintained The internal cleaning is not easy to affect the electrical performance of the insulating tube, and it is convenient to clean and replace the desiccant.

Preferably, the desiccant is a solid desiccant; more preferably, the desiccant is a molecular sieve desiccant and/or a calcium chloride desiccant and/or a silica gel desiccant and/or a fiber desiccant.

Preferably, the desiccant is wrapped in a receiving bag having a mesh and placed in a desiccant container; the desiccant is wrapped and placed in a desiccant container so that the through hole size of the desiccant container is not dried. The size of the agent can be appropriately increased to increase the size of the through hole of the container, so that the desiccant can be better contacted with the insulating gas, and the whole package can facilitate the preservation and replacement of the desiccant.

Preferably, the flange is provided with a receiving portion along the inside of the insulating tube, and the drying device is disposed in the receiving portion, the receiving portion includes a first cover, a receiving cavity and a control device, and the first cover is provided with a protrusion for accommodating the bottom of the cavity a perforation is provided, the control device passes through the perforation, and a through hole is formed in the bottom of the receiving cavity. When the first cover is not connected to the receiving portion, the control device closes the through hole, and when the first cover is connected to the receiving portion, the protrusion is Apply pressure to the control device to open the through hole.

More preferably, the control device includes a fastener, a first limiting member, an elastic member, and an elastic member push rod, and the elastic member push rod has a connecting rod through which the elastic member is pierced and a sealing plate connected to the connecting rod. The first limiting member is disposed on the elastic member and connected to the connecting rod, the fastener is connected to the connecting rod, and is pressed against the first limiting member, and the other end of the elastic member is located at the bottom of the receiving cavity; further, sealing A sealing layer is disposed on a side of the plate adjacent to the insulating tube, and a second limiting member is disposed on a side of the bottom of the receiving cavity away from the insulating tube, and the other end of the elastic member is disposed in the second limiting member.

The above-mentioned receiving portion is provided with a control device. When the first cover is not connected to the receiving chamber, the control device controls the elastic member push rod to close the bottom of the receiving chamber, and blocks the gas exchange between the insulating tube and the outside of the insulating tube; The cover is connected to the receiving cavity, and the protrusion is pressed against the control device, and the through hole of the bottom of the receiving cavity is opened by the control device; the receiving portion can open the first cover when the drying device needs to be replaced, and the through hole of the bottom of the receiving cavity Closed, can be directly replaced, avoiding leakage of insulating gas in the insulating tube, and realizing replacement of the drying device; providing a sealing layer on the side of the sealing plate near the elastic member, so that the sealing effect of the sealing plate is better, and the bottom of the receiving chamber is provided The second limiting member can be placed in the second limiting member to ensure that the elastic member does not shift when being stretched.

Preferably, the desiccant device is directly connected to the flange through the mounting hole and the fastener; the connection mode is simple and easy to implement, and the hole on the flange does not need to be provided to penetrate the flange to ensure the airtight performance of the flange.

Preferably, the flange is further provided with an inflation valve, the inflation valve includes an inflation end and a connection end, the flange is disposed along the inside of the insulation tube, the connection end of the inflation valve is connected to the accommodation portion, and the inflation valve is located in the accommodation portion; More preferably, the receiving portion is a boss extending along the inside of the insulating tube, and the boss is provided with a second cover for use with the boss. When the second cover is connected with the boss, the inflation valve can be closed and fixed to the convex portion. Inside the table; the inflation valve is embedded in the flange, and the cover is closed to cover the inflation valve, so as to ensure that the inflation valve does not need to be exposed to the air when the inflation valve is not used, so that the inflation valve is not easy to age and rust, and the possibility of gas leakage is reduced.

Preferably, the flange is provided with an inflation valve, and the connection end of the inflation valve is connected to the flange through the connection hole, and the inflation end of the inflation valve is located outside the insulation tube; the inflation valve is directly connected to the flange to facilitate the inflation operation, and the process is simple .

Preferably, the inflation valve is connected to the flange by a three-way device, and the inflation end of the inflation valve is located outside the three-way device; more preferably, the three-way device further comprises a control switch and a barometer for controlling the inflation valve The inflation end is connected and blocked with the insulating tube, and the air pressure gauge is used to observe the gas pressure of the gas inside the insulating tube.

The three-way device connects the inflation valve, the control switch and the air pressure gauge, simplifies the structure, and is convenient for observing the internal gas pressure. At the same time, the control switch is used to control the on-off between the inflation end and the insulating tube, thereby reducing the possibility of air leakage at the inflation end and improving the possibility. Safety and sealing performance of the inflation valve.

A second object of the present invention is to provide a composite crossarm including the insulator of any of the above technical solutions; The crossbar width is reduced, the weight of the crossbar is reduced, the cost is reduced, and the service life is prolonged. The composite crossarm is suitable for UHV transmission towers and other transmission towers of various voltage levels.

DRAWINGS

The drawings described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure. In addition, the shapes, proportions, and the like of the components in the drawings are merely illustrative and are used to help the understanding of the present application, and do not specifically limit the shapes and proportions of the components of the present application. Those skilled in the art, in the teachings of the present application, can implement the present application by selecting various possible shapes and ratios depending on the particular circumstances. In the drawing:

1 is a front elevational view showing the inflation valve 110 and the drying device of the first embodiment of the present invention connected to the flange 100.

Fig. 2 is an enlarged schematic view showing a portion A of the flange 100 according to the first embodiment of the present invention.

Fig. 3 is an enlarged schematic view showing a portion B of the flange 100 according to the first embodiment of the present invention.

Fig. 4 is an exploded perspective view showing the inflation valve 110 and the drying device of the first embodiment of the present invention connected to the flange 100.

FIG. 5 is a perspective view showing the flange 100 connected to the insulating tube 1000 according to the first embodiment of the present invention.

Fig. 6 is a front elevational view showing the inflation valve 210 and the drying device 230 of the second embodiment of the present invention connected to the flange 200.

Figure 7 is an enlarged schematic view showing a portion C of the flange 200 of the second embodiment of the present invention.

Figure 8 is an enlarged schematic view showing a portion D of the flange 200 of the second embodiment of the present invention.

FIG. 9 is a perspective view showing the flange 200 of the second embodiment of the present invention connected to the insulating tube 2000.

Figure 10 is a front elevational view showing the inflation valve 310 of the third embodiment of the present invention attached to the flange 300.

Figure 11 is an enlarged schematic view showing a portion E of the flange 300 of the third embodiment of the present invention.

Figure 12 is a perspective view showing the flange 300 of the third embodiment of the present invention connected to the insulating tube 3000.

detailed description

Specific embodiments of the invention are disclosed herein as required. However, it should be understood that the embodiments disclosed herein are merely exemplary of the invention and may be embodied in various forms. Therefore, the specific details disclosed herein are not to be construed as limiting, but rather as the basis of the claims, and as a representative basis for teaching the skilled in the art to apply the present invention differently in any suitable manner in practice. This includes the use of various features disclosed herein in conjunction with features that may not be explicitly disclosed herein.

It should be noted that when a component is referred to as being "set to" another component, it can be directly on the other component or the component can be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or. The terms "vertical", "horizontal", "left", "right", and the like, as used herein, are for the purpose of illustration and are not intended to be the only embodiment.

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 invention applies, unless otherwise defined. The terminology used herein is for the purpose of describing particular embodiments, and is not intended to be limiting. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

Embodiment 1:

As shown in FIG. 1 to FIG. 5, the composite insulator 1000 includes an insulating tube 1100, a shed 1200 covering the outside of the insulating tube 1100, and a flange 100 connected to both ends of the insulating tube 1100. A is an inflation valve 110 on the flange 100. Part of the connection of the flange 100, B is a part of the drying device (not shown) connected to the flange 100.

As shown in FIG. 2, FIG. 4 and FIG. 5, a side of the flange 100 adjacent to the insulating tube 1100 is provided with a receiving portion, and the inflation valve 110 is disposed in the receiving portion. Specifically, the inflation valve 110 flange 100 is along the insulating tube. The 1100 extends out of the boss 130, and the inflation valve 110 is placed in the boss 130. The inflation valve 110 includes an inflation end 111 and a connection end 112. The bottom of the boss 130 is provided with a thread 131 connected to the inflation valve 110, and the connection end 112 is provided with a thread 113 for use with the thread 131. Further, the opening of the boss 130 is screwed with a cover 120. The cover 120 is provided with a groove 121 near the center of the side of the inflation end 111. When the cover 120 is connected to the flange 100, the inflation end 111 can be placed. In the recess 121, the other side of the cover 120 is provided with a knob slot 122 for operating the mounting and detaching of the cover 120.

As shown in FIG. 3, FIG. 4 and FIG. 5, the drying device is connected to the flange 100. Specifically, the flange extends along the inside of the insulating tube 1100 with a receiving portion in which the drying device is located. The receiving portion includes a cover. 140, housing chamber 190 and control device. The cover 140 is screwed to the flange 100. The cover 140 is provided with a protrusion 141 on one side of the insulating tube 1100 and a knob slot 142 on the other side for mounting and dismounting the cover 140. When the cover 140 is coupled to the receiving cavity 190, the projection 141 can contact and press against the control device. The control device includes a fastener 150, a limiting member 160, an elastic member 170 and an elastic member push rod 180, wherein the elastic member push rod 180 includes a connecting rod 181 and a sealing plate 182 connected to the connecting rod 181, the connecting rod 181 and the sealing plate 182 is vertical in the front face, and a sealing member 183 is laid on the side of the sealing plate 182 near the receiving portion.

The accommodating chamber 190 has a boss shape, and the bottom of the accommodating chamber 190 is provided with a through hole 191, and a through hole 192 through which the gas flows. The bottom of the accommodating chamber 190 near the elastic member 170 is provided with a cylindrical stopper 193. The diameter of the limiting member 193 is larger than the diameter of the through hole 191, and the through hole 191 is disposed coaxially with the limiting member 193. The connecting rod 181 passes through the through hole 191, that is, one end of the connecting rod 181 is placed inside the receiving chamber 190, the other end is placed outside the receiving chamber 190, and the end of the connecting rod 181 outside the receiving chamber 190 is connected with the sealing plate 182, that is, The sealing plate 182 is placed outside the accommodating chamber 190, and the connecting rod 181 is placed at one end of the accommodating chamber 190 to connect the limiting member 160. The limiting member 160 has a boss shape, and the limiting member is provided with a hole 161 for the connecting rod 181 to pass through. The limiting member 160 is screwed with the connecting rod 181 at the hole 161, and the fastener 150 is disposed close to the limiting member 160. The fastener 150 is screwed to the connecting rod 181, that is, the fastener 150, the limiting member 160 and the connecting rod 181 are tightly connected. When the cover 140 is coupled to the accommodating cavity 190, the protrusion 141 can contact and press the fastener 150. When the limiting member 160 is coupled to the connecting rod 181, the two ends of the elastic member 170 can be respectively placed at the limit. The piece 160 and the limiting piece 193 are inside. The receiving cavity 190 and the limiting member 160 are not limited to the boss shape, the limiting member 193 is not limited to the cylindrical shape, the fastener 150 may be a nut, and the elastic member 170 may be a spring.

The drying device comprises a desiccant, the desiccant may be a fiber desiccant, and the fiber desiccant may be directly placed in the above-mentioned receiving portion, and the desiccant may also be a molecular sieve desiccant and/or a calcium chloride desiccant and/or a silica gel desiccant and/or Or fiber desiccant. The above drying apparatus further includes a desiccant container having a receiver through hole in which the desiccant is placed. The desiccant may also be wrapped in a mesh-shaped accommodating bag and placed directly in the accommodating portion, and it is only necessary to set the size of the through hole 192 to be smaller than the size of the desiccant accommodating bag. Further, the desiccant may also be wrapped by the holding bag, and placed in the desiccant container, and then placed in the desiccant receiving chamber.

The operating device of the drying device has a working principle: when the cover 140 is not connected to the receiving cavity 190, that is, the protrusion 141 is not pressed against the fastener 150 of the control device, the elastic member 170 has a certain amount of pre-compression, and the pre-compression The amount of the elastic member 170 has an upward pressure on the limiting member 160, and the connecting rod 181 is supported by the limiting member 160, so that the sealing plate 182 is attached to the bottom of the accommodating chamber 190, and the sealing member 183 on the sealing plate 182 makes the sealing effect more effective. good. When the cover 140 is coupled to the receiving cavity 190, the protrusion 141 is pressed against the fastener 150, and the fastener 150 transmits pressure to the elastic member 170 and the connecting rod 181 through the limiting member 160, and the connecting rod 181 drives the sealing plate 182. Moving away from the bottom of the accommodating chamber 190, the sealing plate 182 is separated from the bottom of the accommodating chamber 190 such that the through hole 192 communicates with the accommodating chamber 190 and the insulating tube 1100 to form a gas passage, and the insulating gas can exchange gas with the inside of the accommodating chamber 190. At the same time, the elastic member 170 is further compressed to store the elastic potential energy. When the cover 140 is again rotated out of the accommodating chamber 190, the elastic member 170 gradually releases the elastic potential energy, and the limiting member 160 is pressed to drive the connecting rod 181 to move toward the accommodating chamber 190. In turn, the sealing plate 182 is brought into close contact with the bottom of the accommodating chamber 190, and at the same time, due to the inflow of air into the accommodating chamber 190, a difference in air pressure is formed between the insulating tube 1100 and the accommodating chamber 190, and the air pressure difference also ensures the sealing plate 182 and the accommodating portion. The bottom of the cavity 190 is closely fitted, and the through hole 192 is closed to block the exchange passage of the insulating gas in the accommodating cavity 190 and the insulating tube 1100.

As shown in FIG. 5, each of the inflation valve 110 and the drying device is located on the side of the flange 100. It is of course conceivable that there may be more than one one of the inflation valve 110 and the drying device, and the installation position may be any one or both ends of the flange 100 at both ends of the insulating tube 1100, and the fixed position on the flange 100 may also be flexible according to actual conditions. The fastener 150 may also be any member having a fastening effect such as a bolt or a washer.

In this embodiment, the inflation valve 110 is screwed into the boss 130, and the cover 120 is further used to prevent the inflation valve 110 from being exposed to the air after use, to prevent corrosion damage of the inflation valve 110, and leakage of the inflation end 111. The control device in the drying device accommodating portion, the fastener 150 is mounted close to the limiting member 160, and has the effect of transmitting the force to the elastic member 170, and has the effect of secondary fastening; the limiting member 160, the limiting member 193 and The elastic members 170 are coaxially disposed to ensure that the elastic member 170 does not deviate in the direction of the connecting rod 181, and the sealing defects of the sealing plate 182 and the bottom of the receiving chamber 190 are avoided. The sealing member 183 is further provided on the sealing plate 182 to further ensure the sealing member 183. The reliability of the seal. The drying device is connected to the flange 100, does not contact the insulating tube 110, and the flange has a shielding function, which does not easily affect the electrical performance of the insulating tube 1100. A control device is disposed in the accommodating portion of the drying device. The cover 140 is used in conjunction with the control device. When the cover 140 closes the accommodating cavity 190, the venting cavity 190 and the insulating tube 1100 are circulated in the gas. When the cap 140 is removed, the bottom of the accommodating cavity 190 is closed. The gas is circulated between the accommodating chamber 190 and the insulating tube 1100. The control device prevents gas leakage in the insulating tube when the drying device in the accommodating portion is replaced, thereby realizing replacement of the drying device and prolonging the service life of the insulator.

Embodiment 2:

As shown in FIG. 6 to FIG. 9, the composite insulator 2000 includes an insulating tube 2100, a shed 2200 covering the outside of the insulating tube 2100, and a flange 200 connected to both ends of the insulating tube 2100, and C is an inflation valve 210 connected to the flange 200. Part D, D is the portion of the drying device 230 that is attached to the flange 200.

As shown in FIG. 7 and FIG. 9, the inflation valve 210 includes an inflation end 211 and a connection end 212. The flange 200 is provided with a connection hole 220. The connection end 212 passes through the connection hole 220 and is connected to the flange 200. The connection manner may be The threaded connection, the inflation end 211 is located on the side of the flange 200 away from the insulating tube 2100. A portion of the inflation valve 210 disposed outside the flange 200 may be provided with a threaded section (not shown) for connecting the inflatable cover, and the inflatable cover is disposed on the inflatable end 211 after the inflation valve 210 is used. It is possible to prevent the inflated end 211 exposed to the air from accumulating dust and rain, preventing rust and corrosion, and preventing the inflated end 211 from leaking.

As shown in FIGS. 8 and 9, the drying device 230 is directly coupled to the flange 200. The drying device 230 includes a desiccant container 234 and a desiccant (not shown), and the desiccant is placed in the desiccant container 234. The desiccant container 234 is provided with a receiver through hole 231 which forms a gas passage that communicates the desiccant device 230 and the insulating tube 2100. The desiccant container 234 can be in the shape of a bowl. The edge of the opening side of the desiccant container 234 is provided with a connecting ear 232. The connecting ear 232 is perpendicular to the desiccant container 234. The connecting ear 232 is provided with a mounting hole 233. There is a hole 250 corresponding to the mounting hole 233, and the fastener 240 passes through the mounting hole 233 and the hole 250 to tightly fix the drying device 230 to the flange 200.

As shown in FIG. 9, the inflation valve 210 and the drying device 230 are each one and are located on one side of the flange 200. It is conceivable that the inflation valve 2120 and the drying device 230 may be more than one. The installation position may be any one or both ends of the flange 200 at both ends of the insulating tube 2100, and the fixed position on the flange 200 may also be flexible according to actual conditions. Transform.

In this embodiment, the inflation valve 210 is directly connected to the flange 200, and the connection mode is simple, the opening on the flange is reduced, and the air sealing performance of the flange can be effectively improved; the drying device 230 is fixedly connected to the flange 200, The blue has a certain shielding effect, which ensures that the drying device 230 does not affect the electrical performance in the insulating tube, and the drying device 230 can be fixed without opening a through hole through the flange, which can effectively ensure the airtight performance of the flange.

Embodiment 3:

As shown in FIG. 10 to FIG. 12, the composite insulator 3000 includes an insulating tube 3100, a shed 3200 covering the outside of the insulating tube 3100, and a flange 300 connected to both ends of the insulating tube 3100. The E is a three-way device 320 connected to the flange. Part of 300.

As shown in FIG. 10 and FIG. 11, the inflation valve 310 is connected to the flange 300 through a three-way device 320. The inflation valve 310 includes an inflation end 311 and a connection end 312. The flange 300 is provided with a connection hole 330, and the connection end 312 is threaded. The end is mated to the connection hole 330, and the inflation end 311 is placed outside the three-way device 320. The three-way device 320 is provided with a control switch 340, which is located outside the three-way device 320. The control switch 340 is used to control the communication and blocking of the gas passage between the inflation end 311 and the insulating tube 3100. A barometer 350 is connected to the three-way device 320 for observing the air pressure value inside the insulating tube.

As shown in FIG. 12, the inflation valve 310 is one, and the drying device 360 is connected to the flange 300 by the connection method of the drying device in the second embodiment, and both are located at the same end flange 300. It is of course conceivable that the drying device 360 can also be connected to the flange 300 by the connection method in the first embodiment. The inflation valve 310 and the drying device 360 can be more than one. The installation position can be any of the flanges at both ends of the insulating tube 3100. The fixed position on one end or both ends on the flange 300 can also be flexibly changed according to actual conditions. The three-way device 320 is provided with a control switch 340 and a barometer 350. It is conceivable that the actual path or structure can be appropriately reduced or increased according to requirements.

In this embodiment, the control switch 340 and the air pressure gauge 350 can be simultaneously disposed on the three-way device 320. When the control switch 340 is closed, even if the inflation valve 310 is opened, the insulating gas inside the insulating tube 3100 does not leak, thereby effectively improving the insulating tube. The airtight performance of the 3100; the air pressure gauge 350 helps to observe the air pressure in the insulating tube 3100 in real time, and can take timely repair measures when the air pressure in the insulating tube 3100 is too high or too low; the inflation valve 310 passes through the three-way device 320 and the flange 300 connected, adding control and observation functions and simplifying the structure.

The present application also provides a composite crossarm, comprising the composite insulator described in any of the above embodiments, the composite crossarm is insulated by itself, the line insulator is eliminated, the corridor is shortened, and the connection is simple. The use of a gas-insulated insulator with a drying device reduces weight, prolongs service life and reduces costs, and is suitable for UHV transmission towers and other transmission towers of various voltage levels.

It should be noted that the insulators disclosed in the first embodiment, the second embodiment and the third embodiment are all composite insulators, but it is conceivable that the inflation valve, the drying device and the inflating inner insulation scheme in the embodiment are also applicable to porcelain. In the embodiment, the inflation valve and the drying device are connected to the flange by different connection manners. It is conceivable that different connection modes in the three embodiments can be combined with each other, and are not limited to the combination of the above three embodiments. the way.

It is to be understood that the above description is for the purpose of illustration and not limitation. Many embodiments and many applications beyond the examples provided will be apparent to those skilled in the art from this description. Therefore, the scope of the present invention should be determined by reference to the foregoing description The disclosures of all articles and references, including patent applications and publications, are hereby incorporated by reference in its entirety for all purposes. Any aspect of the subject matter disclosed herein is omitted in the preceding claims and is not intended to be a waiver of the subject matter, nor should the applicant be considered as a part of the disclosed subject matter.

Claims

An insulator includes an insulating tube and a flange connected to both ends of the insulating tube, wherein the insulating tube is filled with an insulating gas, and a drying device is disposed in the insulating tube.
The insulator according to claim 1, wherein said drying means comprises a desiccant and a desiccant container, said desiccant container is provided with a receiver through hole, and said desiccant is placed in said desiccant container In the device.
The insulator according to claim 2, wherein said desiccant is wrapped by a receiving bag having a mesh and placed in said desiccant container.
The insulator of claim 2 wherein said drying means is disposed on said flange.
The insulator according to claim 4, wherein the flange is provided with a receiving portion along the inside of the insulating tube, the drying device is disposed in the receiving portion, and the receiving portion includes a first cover and a receiving cavity. And a control device, the first cover is provided with a protrusion, a bottom of the receiving cavity is provided with a through hole, the control device is disposed in the through hole, and a bottom of the receiving cavity is provided with a through hole. The control device closes the through hole when a cover is not connected to the receiving cavity, and when the first cover is connected to the receiving cavity, the protrusion applies pressure to the control device to open the cover Through hole.
The insulator according to claim 5, wherein said control means comprises a fastener, a first limiting member, an elastic member and an elastic member push rod, said elastic member push rod including said elastic member a connecting rod and a sealing plate connected to the connecting rod, wherein the connecting rod is disposed in the through hole, the sealing plate is located outside the receiving cavity, and the first limiting member is disposed on the elastic One end of the piece is connected to the connecting rod, the fastener is connected to the connecting rod, and is pressed against the first limiting piece, and the other end of the elastic piece is located at the bottom of the receiving cavity.
The insulator according to claim 6, wherein a second limiting member is disposed on a side of the bottom of the receiving cavity away from the insulating tube, and the other end of the elastic member is disposed in the second limiting member. A sealing layer is disposed on a side of the sealing plate adjacent to the elastic member.
The insulator according to claim 4, wherein said drying device is provided with a first mounting hole, said flange being provided with a second mounting hole cooperating with said first mounting hole, said first mounting The hole and the second mounting hole are connected by a fastener.
The insulator according to claim 1, comprising: an inflation valve connected to said flange, said inflation valve comprising an inflation end and a connection end, said flange being provided along an interior of said insulating tube The connecting end is connected to the receiving portion, and the inflation valve is disposed in the receiving portion.
A composite crossarm characterized by comprising the insulator of any one of claims 1 to 9.