Supporting insulator and switchgear

Abstract

The invention relates to the technical field of supporting insulators, in particular to a supporting insulator and switch equipment. The supporting insulator comprises a supporting heat conduction part and connecting heat conduction structures used for being connected with a main loop conductor and a shell of the gas insulated switch, the connecting heat conduction structures are located at the two ends of the supporting heat conduction part, and the supporting heat conduction part is a high-heat-conduction ceramic column. And the lengths of the inner wall surface and the outer wall surface of the high-thermal-conductivity ceramic column along the length direction of the high-thermal-conductivity ceramic column are not less than the insulation distance between the main loop conductor of the gas insulated switch and the shell. According to the supporting insulator, the high-thermal-conductivity ceramic is adopted for heat transfer, so that the supporting insulator has excellent thermal conductivity and also ensures excellent insulating property.

Description

Technical Field

[0001] The present invention relates to the technical field of supporting insulators, and in particular to a supporting insulator and a switch device. Background Art

[0002] Gas-insulated switchgear usually includes a metal shell and a main conductive circuit sealed in the metal shell. The main conductive circuit is isolated from the outside air. The current passing through the main conductor in the main conductive circuit can generally reach thousands of amperes, and the heat generation power is extremely high. The main conductor and the metal shell are insulated by gas. According to the structural requirements, a supporting insulator will be added between the main conductor and the metal shell. The supporting insulator generally uses conventional insulating materials such as epoxy resin and plastic, but the thermal conductivity of these materials is very low and has little effect on heat transfer. The heat of the main conductor is mainly transferred to the metal shell through thermal radiation and natural thermal convection of the internal gas, and then transferred to the external environment through the metal shell. The overall heat transfer efficiency is very low, and the temperature rise of the main conductive circuit is high. In serious cases, accidents may occur and the life of the equipment is affected.

[0003] A Chinese invention patent application with application publication number CN110444353A and application publication date November 12, 2019 discloses a support insulator, which includes a support heat-conducting portion extending up and down and an insulating portion arranged circumferentially outside the support heat-conducting portion, and the support heat-conducting portion includes metal supports at both ends and a ceramic sheet located in the middle of the metal supports and in pressure contact with the metal supports, and the metal supports at both ends are respectively provided with connection structures for connecting to the main conductor and the box body. The support insulator conducts heat through the metal supports and the ceramic sheet, which can effectively improve the heat transfer efficiency of the support insulator and reduce the temperature rise of the main conductive circuit. In order to ensure the thermal conductivity of the support insulator, the thinner the ceramic sheet between the metal supports at both ends, the better the thermal conductivity, but the corresponding insulation distance will be shorter, and there is a problem of poor insulation performance. Summary of the invention

[0004] The object of the present invention is to provide a supporting insulator to solve the problem of poor insulation performance of existing supporting insulators; the object of the present invention is also to provide a switch device using the supporting insulator.

[0005] To achieve the above object, the supporting insulator of the present invention adopts the following technical solutions: A supporting insulator comprises a supporting heat-conducting part and a connecting heat-conducting structure for connecting with a main circuit conductor and a shell of a gas insulated switch, wherein the connecting heat-conducting structure is located at both ends of the supporting heat-conducting part, and the supporting heat-conducting part is a high thermal conductivity ceramic column, and the length of the inner and outer wall surfaces of the high thermal conductivity ceramic column along the length direction of the high thermal conductivity ceramic column is not less than the insulation distance between the main circuit conductor of the gas insulated switch and the shell.

[0006] Furthermore, the connecting heat-conducting structure comprises a hot-end metal clamping piece for connecting to the main circuit conductor of the gas-insulated switch and a cold-end metal clamping piece for connecting to the casing of the gas-insulated switch.

[0007] Furthermore, the hot-end metal clamp and the cold-end metal clamp are respectively clamped and fixed on both ends of the high thermal conductivity ceramic column by bolts.

[0008] Furthermore, bolt countersunk holes for connecting with high thermal conductivity ceramic column bolts are provided on the hot-end metal clamp and the cold-end metal clamp.

[0009] Furthermore, the connecting heat-conducting structure comprises a hot-end metal flange for connecting to the main circuit conductor of the gas-insulated switch and a cold-end metal flange for connecting to the housing of the gas-insulated switch.

[0010] Furthermore, the hot-end metal flange and the cold-end metal flange are respectively fixedly connected to two ends of the high thermal conductivity ceramic column by bolts.

[0011] Furthermore, the high thermal conductivity ceramic column is a hollow cylindrical structure.

[0012] Furthermore, the outer peripheral surface of the high thermal conductivity ceramic column is a corrugated structure.

[0013] Furthermore, the inner circumference of the high thermal conductivity ceramic column is a corrugated structure.

[0014] Beneficial effects: The supporting insulator of the present invention is a pioneering invention. The supporting heat-conducting part of the supporting insulator of the present invention adopts a high thermal conductivity ceramic column made of high thermal conductivity ceramic. The high thermal conductivity ceramic has a high thermal conductivity coefficient and excellent thermal conductivity. The length of the high thermal conductivity ceramic column is not less than the insulation distance between the main circuit conductor of the gas insulated switch and the shell. Through the connecting heat-conducting structure at both ends of the high thermal conductivity ceramic column, an efficient heat transfer channel is formed between the main circuit conductor of the gas insulated switch and the shell, so that heat can be efficiently transferred directly from the main circuit conductor of the gas insulated switch to the metal shell, and the high thermal conductivity and large area of ​​the metal shell are used to dissipate the heat to the external atmosphere, reducing the temperature rise inside the gas insulated switch; at the same time, the high thermal conductivity ceramic column has excellent insulation performance, ensuring the insulation isolation between the main conductive circuit and the shell in the gas insulated switch.

[0015] The switchgear of the present invention adopts the following technical solution: The switchgear comprises a shell, a main conductive circuit is arranged in the shell, the main conductive circuit comprises a main circuit conductor, the above-mentioned support insulator is connected between the main circuit conductor and the shell, the above-mentioned support insulator comprises a support heat-conducting part and a connecting heat-conducting structure for connecting with the main circuit conductor of the gas insulated switch and the shell, the connecting heat-conducting structure is located at both ends of the support heat-conducting part, the support heat-conducting part is a high thermal conductivity ceramic column, and the length of the inner and outer wall surfaces of the high thermal conductivity ceramic column along the length direction of the high thermal conductivity ceramic column is not less than the insulation distance between the main circuit conductor of the gas insulated switch and the shell.

[0016] Furthermore, the connecting heat-conducting structure comprises a hot-end metal clamping piece for connecting to the main circuit conductor of the gas-insulated switch and a cold-end metal clamping piece for connecting to the casing of the gas-insulated switch.

[0017] Furthermore, the hot-end metal clamp and the cold-end metal clamp are respectively clamped and fixed on both ends of the high thermal conductivity ceramic column by bolts.

[0018] Furthermore, bolt countersunk holes for connecting with high thermal conductivity ceramic column bolts are provided on the hot-end metal clamp and the cold-end metal clamp.

[0019] Furthermore, the connecting heat-conducting structure comprises a hot-end metal flange for connecting to the main circuit conductor of the gas-insulated switch and a cold-end metal flange for connecting to the housing of the gas-insulated switch.

[0020] Furthermore, the hot-end metal flange and the cold-end metal flange are respectively fixedly connected to two ends of the high thermal conductivity ceramic column by bolts.

[0021] Furthermore, the high thermal conductivity ceramic column is a hollow cylindrical structure.

[0022] Furthermore, the outer peripheral surface of the high thermal conductivity ceramic column is a corrugated structure.

[0023] Furthermore, the inner circumference of the high thermal conductivity ceramic column is a corrugated structure.

[0024] Beneficial effects: The switchgear of the present invention is an improved invention. The switchgear of the present invention is provided with a supporting insulator between the main circuit conductor and the metal shell. The supporting heat-conducting part of the supporting insulator adopts a high thermal conductivity ceramic column made of high thermal conductivity ceramic. The high thermal conductivity ceramic has a high thermal conductivity coefficient and excellent thermal conductivity. The length of the high thermal conductivity ceramic column is not less than the insulation distance between the main circuit conductor of the gas insulated switch and the shell. The connecting heat-conducting structure at both ends of the high thermal conductivity ceramic column forms an efficient heat transfer channel between the main circuit conductor of the gas insulated switch and the shell, so that heat can be efficiently transferred directly from the main circuit conductor of the gas insulated switch to the metal shell, and the high thermal conductivity and large area of ​​the metal shell are used to dissipate the heat to the external atmosphere, thereby reducing the temperature rise inside the gas insulated switch; at the same time, the high thermal conductivity ceramic column has excellent insulation performance, ensuring the insulation isolation between the main conductive circuit and the shell in the gas insulated switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of a metal clamping member as the connection structure of the support insulator of the present invention; Figure 2 for Figure 1 Left side view of the support insulator; Figure 3 This is a schematic diagram of the structure of a metal flange as the connection structure of the support insulator of the present invention; Figure 4 for Figure 3 Left side view of the support insulator; Figure 5 It is a schematic diagram of the application of the supporting insulator of the present invention in a high-voltage gas-filled switch cabinet; Figure 6 The figure is a schematic diagram of the application of the supporting insulator of the present invention in a high-voltage cylindrical gas-insulated switchgear.

[0026] In the figure: 1. High thermal conductivity ceramic column; 2. Hot end metal clamp; 3. Cold end metal clamp; 4. Hot end metal flange; 5. Cold end metal flange; 6. Bolts; 7. Main circuit conductor; 8. Inflatable cabinet shell; 9. Cylinder shell; 10. Cylinder shell flange. DETAILED DESCRIPTION

[0027] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0028] The supporting heat-conducting part of the supporting insulator of the present invention is made of high thermal conductivity ceramic material as a whole, which can ensure insulation performance while having excellent thermal conductivity, and meet the heat transfer and insulation requirements of high-voltage switches.

[0029] In a basic embodiment, the support insulator includes connection structures at both ends and a support heat-conducting part between the connection structures. The support insulator can be connected between the main circuit conductor and the shell of the gas insulated switch through the connection structures at both ends. The support heat-conducting part between the connection structures adopts a high thermal conductivity ceramic column 1. When in use, the high thermal conductivity ceramic column 1 is connected between the main circuit conductor and the shell of the gas insulated switch through the metal connection structures at both ends. The high thermal conductivity ceramic column 1 can provide an efficient heat conduction channel between the heat concentration point of the main conductive circuit of the gas insulated switch and the shell. The main conductive circuit and the shell are both made of metal materials and the temperature difference between the two is large, so that heat can be transferred from one side of the main conductive circuit to one end of the high thermal conductivity ceramic column 1, and then transferred to the shell through the other end of the high thermal conductivity ceramic column 1. At the same time, the area of ​​the metal shell is large, and the efficiency of heat dissipation from the metal shell to the external air is high, so that the heat dissipation performance of the main conductive circuit can be significantly improved and the temperature rise inside the switch can be reduced.

[0030] In a preferred embodiment, Figure 1 , 2 As shown, the connection structure at both ends of the high thermal conductivity ceramic column 1 is a metal clamp. The left end of the high thermal conductivity ceramic column 1 is connected to a hot end metal clamp 2, and the right end is connected to a cold end metal clamp 3. The hot end metal clamp 2 can connect the left end of the high thermal conductivity ceramic column 1 to the main circuit conductor 7 of the gas insulated switch through bolts, and the cold end metal clamp 3 can connect the right end of the high thermal conductivity ceramic column 1 to the casing of the gas insulated switch through bolts, so that heat can be transferred from the main circuit conductor of the main conductive circuit to the hot end metal clamp 2 at one end of the high thermal conductivity ceramic 1, and then transferred to the cold end metal clamp 3 at the other end through the high thermal conductivity ceramic column 1, and finally transferred from the cold end metal clamp 3 to the casing, and the high thermal conductivity and large area thermal conductivity of the casing are used to dissipate the heat into the surrounding atmosphere, thereby reducing the temperature rise inside the switch.

[0031] In other embodiments, the hot-end metal clamps 2 and the cold-end metal clamps 3 at both ends of the high thermal conductivity ceramic column 1 can be fixedly connected between the main circuit conductor and the casing of the gas insulated switch through pins, so that heat can be transferred from the main circuit conductor to the casing through the high thermal conductivity ceramic column 1. The high thermal conductivity and large-area thermal conductivity of the casing can be used to dissipate heat into the surrounding atmosphere, thereby reducing the temperature rise inside the switch.

[0032] In a preferred embodiment, the hot-end metal clamp 2 and the cold-end metal clamp 3 are both fixedly connected to the two ends of the high thermal conductivity ceramic column 1 by bolts. The hot-end metal clamp 2 and the cold-end metal clamp 3 are both provided with countersunk holes for bolting with the high thermal conductivity ceramic column 1. The bolt heads of the bolts will not be exposed, so as to prevent arcing between the main circuit conductor and the bolts and cause insulation breakdown. The bolt connection facilitates the disassembly and installation between the hot-end metal clamp 2 and the cold-end metal clamp 3 and the high thermal conductivity ceramic column 1. When the high thermal conductivity ceramic column 1 is damaged, it is convenient to replace the high thermal conductivity ceramic column 1 without replacing the whole, thereby reducing the cost. In other embodiments, the hot-end metal clamp 2 and the cold-end metal clamp 3 can be an integrated structure with the high thermal conductivity ceramic column 1, which can improve the structural stability of the supporting insulator as a whole.

[0033] In a preferred embodiment, Figure 3 , 4 As shown, the connection structure at both ends of the high thermal conductivity ceramic column 1 is a metal flange. The left end of the high thermal conductivity ceramic column 1 is connected to a hot end metal flange 4, and the right end is connected to a cold end metal flange 5. The hot end metal flange 4 can connect the left end of the high thermal conductivity ceramic column 1 to the main circuit conductor 7 of the gas insulated switch through bolts, and the cold end metal flange 5 can connect the right end of the high thermal conductivity ceramic column 1 to the casing of the gas insulated switch through bolts, so that heat can be transferred from the main circuit conductor to the hot end metal flange 4 at one end of the high thermal conductivity ceramic column 1, and then transferred to the cold end metal flange 5 at the other end through the high thermal conductivity ceramic column 1, and finally transferred to the casing. The high thermal conductivity and large area thermal conductivity of the casing are used to dissipate heat into the surrounding atmosphere, thereby reducing the temperature rise inside the switch.

[0034] In other embodiments, the hot-end metal flange 4 and the cold-end metal flange 5 at both ends of the high thermal conductivity ceramic column 1 can be fixedly connected between the main circuit conductor and the casing of the gas insulated switch through pins, so that heat can be transferred from the main circuit conductor to the casing through the high thermal conductivity ceramic column 1. The high thermal conductivity and large-area thermal conductivity of the casing are utilized to dissipate the heat into the surrounding atmosphere, thereby reducing the temperature rise inside the switch.

[0035] In a preferred embodiment, the hot end metal flange 4 and the cold end metal flange 5 are both fixedly connected to the two ends of the high thermal conductivity ceramic column 1 by bolts, and the bolt connection facilitates the disassembly and installation between the hot end metal flange 4 and the cold end metal flange 5 and the high thermal conductivity ceramic column 1. When the high thermal conductivity ceramic column 1 is damaged, it is convenient to replace the high thermal conductivity ceramic column 1 without replacing the entire support insulator, thereby reducing costs. In other embodiments, the hot end metal flange 4 and the cold end metal flange 5 can be an integrated structure with the high thermal conductivity ceramic column 1, which can improve the overall structural stability of the support insulator and ensure the insulation performance of the support insulator.

[0036] In a preferred embodiment, the high thermal conductivity ceramic column 1 is a hollow cylindrical structure, and the high thermal conductivity ceramic column 1 also has a certain wall thickness. The high thermal conductivity ceramic column 1 adopts a hollow structure to reduce the manufacturing cost, and the high thermal conductivity ceramic column 1 has a certain wall thickness to ensure that it has the most basic thermal conductivity while ensuring the insulation performance of the high thermal conductivity ceramic column 1. In other embodiments, the high thermal conductivity ceramic column 1 can also be a hollow columnar structure of other shapes such as a rectangular parallelepiped, ensuring that it has the most basic thermal conductivity while ensuring the insulation performance of the high thermal conductivity ceramic column 1; the high thermal conductivity ceramic column 1 can be a solid cylindrical structure, or a solid columnar structure of other shapes, so that it has excellent thermal conductivity while also ensuring its good insulation performance.

[0037] In a preferred embodiment, the outer peripheral surface of the high thermal conductivity ceramic column 1 is a corrugated structure, which can increase the insulation distance of the high thermal conductivity ceramic column 1 and further improve the insulation performance of the high thermal conductivity ceramic column 1; in other embodiments, the outer peripheral surface of the high thermal conductivity ceramic column 1 can be a spiral structure, which can also increase the insulation distance of the high thermal conductivity ceramic column 1 and further improve the insulation performance of the high thermal conductivity ceramic column 1.

[0038] In a preferred embodiment, the high thermal conductivity ceramic column 1 is a hollow columnar structure, and the inner circumference of the high thermal conductivity ceramic column 1 is a corrugated structure, which can increase the insulation distance of the high thermal conductivity ceramic column 1 and improve the insulation performance of the high thermal conductivity ceramic column 1; in other embodiments, the inner circumference of the high thermal conductivity ceramic column 1 can be a spiral structure, which can also increase the insulation distance of the high thermal conductivity ceramic column 1 and improve the insulation performance of the high thermal conductivity ceramic column 1.

[0039] The switch device of the present invention includes a shell, in which a main conductive circuit is arranged, the main conductive circuit includes a main circuit conductor 7, a supporting insulator is arranged between the main circuit conductor 7 and the shell, and the supporting insulator is fixedly installed between the main circuit conductor 7 and the shell through connecting heat-conducting structures at both ends of the supporting insulator, so that an efficient heat transfer channel is formed between the main circuit conductor and the shell of the gas insulated switch, so that heat can be transferred from the main circuit conductor through the connecting heat-conducting structure at one end of the supporting insulator through the high thermal conductivity ceramic column 1 to the connecting heat-conducting structure at the other end, and then transferred from the connecting heat-conducting structure at the other end to the shell, and the high thermal conductivity and large-area heat conduction of the shell are used to dissipate the heat into the surrounding atmosphere, thereby reducing the temperature rise inside the switch.

[0040] like Figure 5As shown, the supporting insulator of the present invention is installed in a high-voltage gas-filled switch cabinet. The main circuit conductor 7 is generally made of copper or aluminum, and a large current flows through it, which is the main heat source of the gas-filled switch cabinet. The gas-filled cabinet housing 8 is generally made of stainless steel, and as the protective housing of the gas-filled switch cabinet, an insulating gas is filled between the main circuit conductor 7 and the gas-filled cabinet housing 8, and the gas is sealed in the gas box housing and isolated from the external environment. A high thermal conductivity ceramic column 1 is installed between the main circuit conductor 7 and the gas-filled cabinet housing 8. One end of the high thermal conductivity ceramic column 1 is connected to the main circuit conductor 7 by bolts through the hot end metal clamp 2, and the other end is connected to the main circuit conductor 7 by bolts through the cold end metal clamp 3. The heat generated by the main circuit is transferred to the gas-filled cabinet housing 8 through the hot end metal clamp 2, the high thermal conductivity ceramic column 1 and the cold end metal clamp 3. The heat is dissipated to the surrounding atmosphere by utilizing the high thermal conductivity and large area thermal conductivity of the gas-filled cabinet housing 8, thereby reducing the temperature rise inside the switch.

[0041] like Figure 6 As shown, the supporting insulator of the present invention is installed in a high-voltage cylindrical gas-insulated switchgear. The main circuit conductor 7 of the high-voltage cylindrical gas-insulated switchgear is generally a cylindrical structure, and the cylindrical shell 9 is generally a cylindrical structure made of aluminum. The inside of the cylindrical shell 9 is filled with insulating gas. One end of the high thermal conductivity ceramic column 1 is connected to the main circuit conductor through the hot end metal flange 4, and the other end is connected to the cylindrical shell flange 10 on the cylindrical shell 9 through the cold end metal flange 5. The heat generated by the main conductive circuit is transferred to the cylindrical shell 9 through the hot end metal flange 4, the high thermal conductivity ceramic column 1 and the cold end metal flange 5. The high thermal conductivity and large area heat conduction of the cylindrical shell 9 are used to dissipate the heat into the surrounding atmosphere, thereby reducing the temperature rise inside the switch.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A supporting insulator, characterized in that: It comprises a supporting heat-conducting part and a connecting heat-conducting structure for connecting with the main circuit conductor and the shell of the gas insulated switch, wherein the connecting heat-conducting structure is located at both ends of the supporting heat-conducting part, and the supporting heat-conducting part is a high thermal conductivity ceramic column, and the length of the inner and outer wall surfaces of the high thermal conductivity ceramic column along the length direction of the high thermal conductivity ceramic column is not less than the insulation distance between the main circuit conductor and the shell of the gas insulated switch.

2. The supporting insulator according to claim 1, characterized in that: The heat-conducting connection structure comprises a hot-end metal clamping piece used for connecting with the main circuit conductor of the gas-insulated switch and a cold-end metal clamping piece used for connecting with the casing of the gas-insulated switch.

3. The supporting insulator according to claim 2, characterized in that: The hot-end metal clamping piece and the cold-end metal clamping piece are respectively clamped and fixed on the two ends of the high thermal conductivity ceramic column by bolts.

4. The supporting insulator according to claim 3, characterized in that: The hot-end metal clamp and the cold-end metal clamp are both provided with bolt countersunk holes for connecting with high thermal conductivity ceramic column bolts.

5. The supporting insulator according to claim 1, characterized in that: The heat-conducting connection structure comprises a hot-end metal flange for connecting with a main circuit conductor of a gas-insulated switch and a cold-end metal flange for connecting with a housing of a gas-insulated switch.

6. The supporting insulator according to claim 5, characterized in that: The hot end metal flange and the cold end metal flange are respectively fixedly connected to the two ends of the high thermal conductivity ceramic column by bolts.

7. The supporting insulator according to any one of claims 1 to 6, characterized in that: The high thermal conductivity ceramic column is a hollow cylindrical structure.

8. The supporting insulator according to any one of claims 1 to 6, characterized in that: The outer peripheral surface of the high thermal conductivity ceramic column is a corrugated structure.

9. The supporting insulator according to any one of claims 1 to 6, characterized in that: The inner circumference of the high thermal conductivity ceramic column is a corrugated structure.

10. A switch device, comprising a housing, a main conductive circuit is arranged in the housing, the main conductive circuit comprises a main circuit conductor, characterized in that: The supporting insulator according to any one of claims 1 to 9 is connected between the main circuit conductor and the casing.

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