A glass insulator

Abstract

The present invention relates to the field of electric power technology, and in particular to a glass insulator. The glass insulator comprises a steel cap, a steel foot and a glass piece. A cooling cavity is provided inside the skirt of the glass piece, and a portion of the cooling liquid is filled in the cooling cavity. A heat spreader is provided in the cooling cavity, and an insulating layer is glued to the inner wall of the cooling cavity. When the insulator is working, the cooling liquid moves due to the shaking of the insulator, and the moving cooling liquid balances the temperature of the insulator, so that the insulator is not prone to the phenomenon of local overtemperature. If the external environment of the insulator is stable during operation, the cooling liquid can balance the temperature by evaporation and condensation using the heat spreader. After the glass insulator explodes, the broken glass pieces are connected to each other under the action of the insulating layer, reducing the safety hazard of the glass pieces breaking and falling. At the same time, the heat spreader provides a good support for the glass pieces after the insulator explodes, so that the glass pieces will not contact other insulators due to the loss of mechanical support due to the explosion, thereby reducing the loss of insulation capacity of the insulator string.

Description

Technical Field

[0001] The invention relates to the technical field of electric power, and in particular to a glass insulator. Background Art

[0002] Insulators are an important part of transmission lines. They are the only electrical insulation parts and important structural support parts. The performance of insulators and the rationality of their configuration directly affect the safe and stable operation of the line. Insulators are generally made of glass and porcelain. Among them, tempered glass insulators are widely used in transmission lines due to their high mechanical strength, light weight, good flexibility of long strings, good arc resistance, good self-cleaning performance, not easy to age, and zero-value self-explosion. Glass insulators can explode after performance deterioration, which makes it easy to find potential accidents during daily line inspections. This is a significant advantage. However, in actual use, glass insulators will cause serious local heating due to uneven distribution of dirty objects on the surface. Excessive temperature difference causes the insulator to explode before performance deterioration, seriously affecting the service life of the glass insulator. This problem is also detailed in the article "Analysis of the Causes of Heating of Glass Insulators on 110kV Lines" in the 5th issue of the journal "Electromagnetic Lightning Arrester" in 2023. At the same time, since the insulator is suspended in the air, the broken glass may injure people and objects when the insulator explodes, causing safety hazards. The Chinese patent document with application publication number CN109448938 A discloses a glass insulator and a method for coating it with an anti-fouling flashover coating. The scheme coats a coating layer on the outer surface of the glass insulator. After the glass insulator explodes, the coating effect of the coating can prevent the glass parts from breaking, and finally falls as a whole covered by the coating. However, in the above scheme, after the insulator explodes, the upper glass insulator will be caught by the glass insulator below it, and the bottom glass insulator will be caught by the connecting hardware below it, and the adjacent insulators will come into contact with each other, resulting in a significant decrease in insulation performance.

[0003] The information disclosed in the background technology section of the present invention is only intended to deepen the understanding of the general background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0004] In view of the deficiencies of the prior art, one of the purposes of the present invention is to provide a glass insulator to solve the problem that the existing glass insulator is prone to self-explosion and has a short service life.

[0005] Another object of the present invention is to solve the problem that insulators contact each other after self-explosion, thereby reducing insulation performance.

[0006] A glass insulator of the present invention adopts the following technical scheme: it comprises a steel cap, a steel foot and a glass piece, the glass piece is in an umbrella skirt shape and comprises a head and a skirt body, the head of the glass piece is inserted into the steel cap and the two are connected through a first connecting part, the steel foot is inserted into the center of the glass piece and is connected to the head of the glass piece through a second connecting part; a cooling cavity is opened inside the skirt body of the glass piece, and a part of the cooling liquid is filled in the cooling cavity, and the cooling liquid can flow in the cooling cavity.

[0007] Optionally, a heat spreader is provided in the cooling cavity, the heat spreader is a sheet body with a microporous structure, and the cooling cavity is a vacuum cavity.

[0008] Optionally, the heat spreader is a multi-layer copper mesh.

[0009] Optionally, the heat spreader covers the skirt of the glass piece inside and outside and circumferentially.

[0010] Optionally, an isolation layer is provided on the inner wall of the cooling cavity. The isolation layer is made of a flexible film material. There is adhesive on the surface of the isolation layer that adheres to the inner wall of the cooling cavity, and the isolation layer is then glued and connected to the inner wall of the cooling cavity.

[0011] Optionally, at least one end of the heat spreader close to the center of the glass piece is connected to the glass piece.

[0012] Optionally, the heat spreader is annular in shape, and the center is connected to the glass piece.

[0013] Optionally, the lower surface of the skirt of the glass piece is a curved surface.

[0014] Optionally, the first connecting part and the second connecting part are cement glue.

[0015] Optionally, the coolant is water.

[0016] The beneficial effects of the present invention are as follows: a glass insulator of the present invention is provided with a cooling cavity inside a glass member, the cooling cavity is partially filled with a coolant, the coolant moves due to the shaking of the insulator when the insulator is working, the moving coolant balances the temperature of the insulator, so that the insulator is not prone to the phenomenon of local overtemperature, and thus is not prone to self-explosion, thereby extending the service life of the glass insulator.

[0017] Furthermore, a heat spreader is provided in the cooling chamber, and the cooling chamber is evacuated. If the external environment of the insulator string is relatively stable when it is working, the coolant inside the insulator cooling chamber can utilize the heat spreader to transfer the heat from the local high temperature position to the low temperature position through evaporation and condensation, thereby achieving the purpose of temperature balance.

[0018] Furthermore, by gluing an isolation layer on the inner wall of the cooling chamber, after the glass insulator explodes, the broken glass pieces are connected to each other under the action of the isolation layer, thereby reducing the safety hazard of glass shattering and falling. At the same time, the heat spreader provides good support for the glass pieces after the insulator explodes, so that the glass pieces will not come into contact with other insulators due to the loss of mechanical support due to the explosion, thereby reducing the loss of insulation capacity of the insulator string. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the overall structure of a glass insulator of the present invention;

[0021] Figure 2 It is a front view of a glass insulator of the present invention;

[0022] Figure 3 A top view of a glass insulator of the present invention;

[0023] Figure 4 for Figure 3 Middle AA section view;

[0024] Figure 5 for Figure 4 Enlarged view of point I in the middle.

[0025] In the figure:

[0026] 100, steel cap; 200, glass piece; 300, first connecting part; 400, second connecting part; 500, isolation layer; 600, heat spreader; 700, steel foot; 800, cooling chamber. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0028] like Figures 1 to 5As shown, a glass insulator provided by an embodiment of the present invention includes a steel cap 100, a steel leg 700 and a glass member 200. The glass member 200 is in an umbrella skirt shape, including a head and a skirt body. The head of the glass member 200 is inserted into the steel cap 100 and the two are connected through a first connecting portion 300. The steel leg 700 is inserted into the center of the glass member 200 and is connected to the head of the glass member 200 through a second connecting portion 400.

[0029] It should be noted that the first connecting part 300 and the second connecting part 400 are cement glue. During production and assembly, the steel cap 100 and the glass piece 200 are filled with cement glue, and the steel cap 100, the glass piece 200 and the steel foot 700 are glued and assembled using an assembly machine with a positioning auxiliary function. During gluing, attention should be paid to ensuring the coaxiality of the steel foot 700, the glass piece 200 and the steel cap 100. Poor coaxiality will also lead to an excessively high self-explosion rate. Afterwards, the assembled glass insulators are subjected to a 50% tensile load test one by one, and the insulator structure height is tested to ensure that the insulators meet the standard requirements.

[0030] A cooling cavity 800 is provided inside the skirt of the glass member 200, and part of the cooling liquid is filled in the cooling cavity 800, that is, the cooling liquid does not fill the cooling cavity 800, and can flow in the cooling cavity 800. When in use, the steel cap 100 of the lower insulator is inserted into the steel foot 700 of the upper insulator, and the steel cap 100 and the steel foot 700 are locked by a latch, thereby forming an insulator string. The insulator string is connected to the pole tower through other hardware (such as a bowl head hanging plate, a ball head hanging ring, a connecting plate, a suspension wire clamp, a tension wire clamp, etc.), and the lower part of the string is connected to the wire, and then the wire is erected on the tower pole. Because the insulator string is used at high altitude, it is affected by the outdoor high altitude environment, and the insulator string will have a certain amount of shaking. The coolant set inside the insulator moves due to the shaking of the insulator when the insulator is working. The moving coolant balances the temperature of the insulator, making it less likely for the insulator to have a local overtemperature phenomenon, and thus less likely to self-explode, thereby extending the service life of the glass insulator. Preferably, the coolant may be water.

[0031] In a further embodiment, a heat spreader 600 is provided in the cooling cavity 800. The heat spreader 600 is a sheet with a microporous structure. Preferably, the heat spreader 600 can be made of a multi-layer copper mesh. The interior of the cooling cavity 800 is evacuated to form a vacuum cavity with a low vacuum environment. When the glass part 200 of the insulator is locally heated, the coolant near the heat source is heated in a low vacuum environment and begins to vaporize to produce water vapor. The water vapor absorbs heat energy and automatically flows to the low-pressure area. After the water vapor floats to the low-temperature area, it releases heat and condenses into liquid water again. The liquid water droplets on the heat spreader 600 and flow to the dry evaporation section due to the capillary action of the microstructure of the heat spreader 600, and then return to the evaporation heat source. This operation will be repeated in the cooling chamber 800 to form a self-circulation, thereby realizing heat transfer. Furthermore, in order to ensure the smooth flow of water vapor, the heat spreader 600 and the upper and lower surfaces of the cooling chamber 800 have gaps (the upper side is close to the steel cap 100 along the axial direction of the glass insulator, and the lower side is opposite). By setting the heat spreader 600, if the external environment of the insulator is relatively stable when working, the coolant inside the insulator cooling cavity 800 can transfer the heat from the local high temperature location to the low temperature location by evaporation and condensation, thereby ensuring the relative temperature balance. The heat spreader 600 covers the skirt of the glass component 200 as much as possible inside and outside and in the circumferential direction, so that the glass component 200 can better achieve heat balance.

[0032] In a further embodiment, the inner peripheral wall of the cooling cavity 800 is provided with an isolation layer 500, the isolation layer 500 is made of a flexible film material, and the isolation layer 500 has adhesive on the surface of the isolation layer 500 that is in contact with the inner wall of the cooling cavity 800, and is then glued and connected to the inner wall of the cooling cavity 800. Since the isolation layer 500 with an adhesive function is provided inside the glass piece 200, the broken glass pieces 200 are connected to each other under the action of the isolation layer 500 when the insulator explodes, thereby reducing the safety hazard of the glass piece 200 breaking and falling. At the same time, a heat spreader 600 is provided, at least one end of which is close to the center of the glass piece 200 and connected to the glass piece 200, so as to provide good support to the glass piece 200 after the insulator explodes, so that the glass piece 200 will not contact other insulators due to the loss of mechanical support due to the explosion, and because the cooling chamber inside the glass piece 200 is a vacuum chamber, the fragments of the glass piece 200 are instantly adsorbed on the heat spreader 600 under the action of the pressure difference after the insulator explodes, and are less likely to fall off. In the prior art, the insulators in contact with each other after the explosion will cause the creepage distance of the insulator string to shorten, thereby weakening the insulation performance. The present invention can well improve this problem, and minimize the loss of the overall insulation capacity of the insulator string while ensuring safety. Preferably, the heat spreader 600 of the present invention is annular, the center is connected to the glass piece 200, and the outer edge has a gap with the glass piece, so that the coolant can flow smoothly in the cooling chamber.

[0033] Furthermore, the lower surface of the skirt of the glass member 200 is a tortuous surface, that is, a plurality of protrusions are arranged at intervals on the lower surface of the skirt of the glass member 200 to form a tortuous surface, which can increase the creepage distance of the insulator, prevent short circuits, and improve insulation capacity.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A glass insulator, characterized in that: The invention comprises a steel cap, a steel foot and a glass piece, wherein the glass piece is in an umbrella skirt shape and comprises a head and a skirt body, the head of the glass piece is inserted into the steel cap and the two are connected through a first connecting part, the steel foot is inserted into the center of the glass piece and is connected to the head of the glass piece through a second connecting part; a cooling cavity is provided inside the skirt body of the glass piece, and a part of the cooling liquid is filled in the cooling cavity, and the cooling liquid can flow in the cooling cavity; A heat spreader is provided in the cooling chamber. The heat spreader is a sheet with a microporous structure, and the cooling chamber is a vacuum chamber. When the glass part of the insulator is locally heated, the coolant near the heat source is heated and vaporized in a low vacuum environment to produce water vapor. The water vapor absorbs heat energy and automatically flows to the low-pressure area. After the water vapor floats to the low-temperature area, it releases heat and condenses into liquid again. The liquid cooling liquid drops on the heat spreader and flows to the dry evaporation section due to the capillary action of the microstructure of the heat spreader, and then returns to the evaporation heat source to form a self-circulation.

2. A glass insulator according to claim 1, characterized in that: The heat spreader is a multi-layer copper mesh.

3. A glass insulator according to claim 1, characterized in that: The inner wall of the cooling cavity is provided with an isolation layer, which is made of a flexible film material. The surface of the isolation layer that adheres to the inner wall of the cooling cavity has adhesive, and is then glued and connected to the inner wall of the cooling cavity.

4. A glass insulator according to claim 3, characterized in that: At least one end of the heat spreader close to the center of the glass piece is connected to the glass piece.

5. A glass insulator according to claim 4, characterized in that: The heat spreader is annular in shape, and the center is connected to the glass piece.

6. A glass insulator according to claim 1, characterized in that: The lower surface of the skirt of the glass piece is a tortuous surface.

7. A glass insulator according to claim 1, characterized in that: The first connection part and the second connection part are cement glue.

8. The glass insulator according to claim 1, characterized in that: The coolant is water.

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