Wall bushing with composite insulation support column structure

Abstract

The invention discloses a wall bushing with a composite insulation support column structure, and relates to the field of electrical equipment, the wall bushing comprises a mounting plate, a support column and a current-carrying conductor, the support column comprises an insulation outer sleeve, the insulation outer sleeve is coaxially connected with the mounting plate, the insulation inner sleeve is coaxially provided with the current-carrying conductor, and two insulation terminals are arranged at two ends of the insulation inner sleeve and the insulation outer sleeve. The two insulation terminals are arranged in the insulation outer sleeve and are provided with current-carrying conductors in a penetrating mode, the two insulation terminals, the insulation outer sleeve and the insulation inner sleeve form a heat dissipation cavity, the heat dissipation cavity is filled with high-expansion-coefficient gas, and the heat dissipation structure is arranged in the heat dissipation cavity and can dissipate heat on the current-carrying conductors. The conduction of heat generated when the current-carrying conductor is electrified can be enhanced, the temperature difference between the current-carrying conductor and the surface of the insulation supporting column is reduced, overheating of the insulation material is avoided, and the insulation performance of the wall bushing is improved.

Description

Technical Field

[0001] The invention relates to the field of electrical equipment, in particular to a wall bushing with a composite insulating support column structure. Background Art

[0002] In the power system, wall bushings are key components that connect indoor and outdoor electrical equipment, and they perform the dual functions of current carrying and insulation.

[0003] During power system operation, current-carrying conductors generate significant heat when current flows through them. Existing wall bushings have a relatively simple heat dissipation structure, making it difficult to effectively dissipate this heat, leading to elevated temperatures within the bushing. This is particularly true in UHVDC transmission systems, where currents can reach thousands of amperes. The resulting heat can rapidly increase the internal temperature of the bushing, accelerating the aging of insulation materials and degrading insulation performance. In severe cases, this can lead to insulation breakdown and equipment burnout.

[0004] Existing wall bushings with composite insulating support columns typically use static air cooling or simple natural convection. Due to the extremely low thermal conductivity of composite insulating materials (such as epoxy resin and silicone rubber), heat generated by the current-carrying conductor cannot be effectively dissipated through the insulating support column. This results in a large temperature difference between the current-carrying conductor and the surface of the insulating support column, causing the insulation material to overheat, accelerating molecular chain breakage, and degrading insulation performance. Summary of the Invention

[0005] The purpose of the present invention is to provide a wall bushing with a composite insulating support column structure, which can enhance the dissipation of heat generated when the current-carrying conductor is energized, reduce the temperature difference between the current-carrying conductor and the surface of the insulating support column, avoid overheating of the insulating material, and improve the insulation performance of the wall bushing.

[0006] The above-mentioned optimized structure of the present invention is achieved through the following technical solutions: the wall bushing of the composite insulating support column structure includes a mounting plate, a support column and a current-carrying conductor, the support column includes an insulating jacket, and the insulating jacket is coaxially connected to the mounting plate; an insulating inner sleeve, wherein the current-carrying conductor is coaxially arranged on the insulating inner sleeve; Two insulating terminals, the two insulating terminals being provided at both ends of the insulating inner sleeve and the insulating outer sleeve, and both of which are provided with the current-carrying conductor, and the two insulating terminals, the insulating outer sleeve, and the insulating inner sleeve forming a heat dissipation cavity, the heat dissipation cavity being filled with a high expansion coefficient gas; It also includes a heat dissipation structure, which is arranged in the heat dissipation cavity and can dissipate the heat on the current-carrying conductor.

[0007] In some embodiments, the heat dissipation structure includes a partition plate, and the partition plate is provided in the middle of the heat dissipation cavity; Two piston rings, the two piston rings are coaxially and symmetrically sleeved on the insulating inner sleeve, and the piston rings are slidably and sealed in the heat dissipation cavity; A reset assembly is provided between the insulating terminal and the piston ring.

[0008] In some embodiments, the reset assembly includes at least two support rods, one end of each support rod is fixedly connected to one of the insulating terminals; A reset groove, the reset groove being coaxially arranged at an end of the support rod away from the insulating terminal; a reset plug, which is slidably and sealingly disposed in the reset groove, and a reset liquid is filled between the reset plug and the reset groove; A reset rod is arranged between the reset plug and the piston ring.

[0009] In some embodiments, a plurality of support plates are further included, and the plurality of support plates are spirally arranged between the insulating inner sleeve and the insulating outer sleeve, and the support rods are penetrated.

[0010] In some embodiments, the heat dissipation structure further includes a communication hole, wherein the communication hole passes through the insulating jacket; A sliding groove, the sliding groove is provided on a side of the mounting plate close to the insulating jacket and is coaxially arranged with the communicating hole; a movable plug, the movable plug being slidable and sealed in the sliding groove; a vent hole, the vent hole passing through the mounting plate and connected to the top of the sliding groove; A sliding spring is provided between the movable plug and the inner wall of the sliding groove.

[0011] In some embodiments, the heat dissipation structure further includes an energy dissipation groove, which is coaxially arranged on the sliding groove and connected to the vent hole; A limit blocking piece is provided between the energy dissipation groove and the sliding groove, and the sliding spring is provided between the limit blocking piece and the movable plug.

[0012] In some embodiments, the movable plug includes a plug body, which is slidably and sealingly disposed in the sliding groove and connected to the sliding spring; An impact column is coaxially arranged on the top of the plug body, and the sliding spring is arranged on the periphery of the impact column.

[0013] In some embodiments, the heat dissipation structure further includes a collision block, which is slidably disposed in the energy dissipation slot; An impact spring is provided between the impact block and the inner wall of the energy dissipation groove.

[0014] In some embodiments, the heat dissipation structure further includes a filter ring, which is disposed between the energy dissipation groove and the vent hole.

[0015] In some embodiments, the heat dissipation structure includes a plurality of communication holes, and the plurality of communication holes are provided through the insulating inner sleeve and connected to the heat dissipation cavity.

[0016] One or more of the above technical solutions in the embodiments of the present invention have at least the following technical effects or advantages: The present invention utilizes the principle of thermal expansion and contraction caused by temperature changes to drive the heat dissipation structure to work, without the need for an additional power device. When the temperature of the current-carrying conductor rises, the gas in the heat dissipation cavity expands, the air pressure increases, pushing the piston ring to move, compressing the reset component, dissipating the heat and lowering the temperature. The poor thermal conductivity of the composite insulating support column is utilized to prevent the heat of the current-carrying conductor from being transferred to the heat dissipation cavity in time, causing the gas to contract and the reset spring to push the piston ring to reset, thereby forming a reciprocating heat dissipation motion.

[0017] The present invention can make the temperature field of the entire support column more balanced through the reciprocating motion of the piston ring, reduce defects such as interface debonding and cracks caused by thermal stress, and thus overcome the problem of temperature stratification in traditional static heat dissipation.

[0018] The heat dissipation structure of the present invention adopts a fully insulating design, which can avoid the problem of electric field distortion caused by the introduction of metal components. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0019] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 is a side view of the present invention; Figure 3 For the present invention Figure 2 Cross-sectional view along the AA axis; Figure 4 For the present invention Figure 3 Enlarged view of point B in the middle; Figure 5 For the present invention Figure 3 Enlarged view of point C in the middle.

[0020] In the figure: 1. Mounting plate; 2. Support column; 21. Insulating outer sleeve; 22. Insulating inner sleeve; 23. Insulating terminal; 24. Heat dissipation cavity; 3. Current-carrying conductor; 4. Heat dissipation structure; 41. Partition plate; 42. Piston ring; 43. Reset assembly; 431. Support rod; 432. Reset groove; 433. Reset plug; 434. Reset rod; 44. Connecting hole; 45. Sliding groove; 46. Movable plug; 461. Plug body; 462. Impact column; 47. Vent; 48. Sliding spring; 49. Energy dissipation groove; 5. Support plate. DETAILED DESCRIPTION

[0021] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0022] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0024] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0025] refer to Figure 1-5The wall bushing with a composite insulating support column structure includes a mounting plate 1, a support column 2, and a current-carrying conductor 3. The mounting plate 1 is usually made of metal such as stainless steel. The mounting plate 1 may be provided with mounting holes and can be connected to a wall or equipment cabinet via bolts to secure the wall bushing. The support column 2 may be integrally formed of high-temperature vulcanized silicone rubber, which has good flexibility and insulation properties. The support column 2 can insulate and support the current-carrying conductor 3. The current-carrying conductor 3 passes through the support column 2 to transmit current. The current-carrying conductor 3 may be a copper busbar or a copper rod. The support column 2 and the current-carrying conductor 3 may be sealed to insulate the current-carrying conductor 3. The support column 2, the mounting plate 1, and the current-carrying conductor 3 may all be provided with silicone rubber sealant to form a sealed structure to prevent the ingress of external moisture and dust. The support column 2 includes an insulating outer sleeve 21, an insulating inner sleeve 22 and two insulating terminals 23. The insulating outer sleeve 21 is coaxially connected to the mounting plate 1 and can be made of weather-resistant insulating materials such as silicone rubber to provide mechanical support and external insulation protection for the entire support column. It can be set as an umbrella skirt structure. The insulating inner sleeve 22 is coaxially provided with a current-carrying conductor 3 to form support and insulation for the current-carrying conductor 3. The two insulating terminals 23 are arranged at both ends of the insulating inner sleeve 22 and the insulating outer sleeve 21, and both are penetrated by a current-carrying conductor 3. The insulating terminals 23 and the insulating inner sleeve 22 can both be made of high-strength insulating materials such as glass fiber reinforced epoxy resin, and form a composite insulating support column structure with the insulating outer sleeve 21, and the two insulating terminals 23 and the insulating outer sleeve 21 and the insulating inner sleeve 22 form a heat dissipation cavity 24. The heat dissipation cavity 24 is filled with a high expansion coefficient gas. The heat dissipation cavity 24 can provide space for the heat dissipation structure 4, which is conducive to heat dissipation. The heat dissipation structure 4 is arranged in the heat dissipation cavity 24 and can dissipate the heat on the current-carrying conductor 3.

[0026] In some embodiments, the heat dissipation structure 4 includes a partition plate 41, two piston rings 42 and a reset assembly 43. The partition plate 41 is arranged in the middle of the heat dissipation cavity 24, and can divide the heat dissipation cavity 24 into two relatively independent spaces to improve the heat dissipation efficiency. The two piston rings 42 are coaxially and symmetrically sleeved on the insulating inner sleeve 22. The piston ring 42 is slidable and sealed in the heat dissipation cavity 24. The piston ring 42 can be made of polytetrafluoroethylene, and its inner diameter and the outer diameter of the insulating inner sleeve 22 adopt an interference fit to ensure the sealing performance while being able to slide flexibly. When the current-carrying conductor 3 generates heat, the high expansion coefficient gas in the heat dissipation cavity 24 expands due to the heat, pushing the piston ring 42 to move, converting the heat energy into kinetic energy of the piston ring 42, thereby reducing the energy in the heat dissipation cavity 24, thereby dissipating the heat of the current-carrying conductor 3. The reset assembly 43 is arranged between the insulating terminal 23 and the piston ring 42, and can reset the piston ring 42 after it moves, thereby ensuring the normal operation of the heat dissipation structure.

[0027] In some embodiments, the reset assembly 43 includes at least two support rods 431, a reset groove 432, a reset plug 433 and a reset rod 434. One end of the support rod 431 is fixedly connected to one of the insulating terminals 23 to provide support for the reset assembly. The support rod 431 can be made of a glass fiber rod and can be bonded and fixed to the insulating terminal 23 by epoxy resin glue. The reset groove 432 is coaxially arranged at the end of the support rod 431 away from the insulating terminal 23 to provide space for the movement of the reset plug 433. The reset plug 433 can be slidably and sealed in the reset groove 432. The reset plug 433 and the reset groove 434 are fixedly connected. 2 can be provided with an O-ring to ensure air tightness, and a reset liquid is filled between the reset plug 433 and the reset groove 432. The reset liquid can be hydraulic oil or silicone oil. By utilizing the incompressibility and fluidity of the reset liquid, when the piston ring 42 moves, the reset plug 433 slides in the reset groove 432, thereby achieving buffering and resetting when the reset rod 434 moves. The reset rod 434 is provided between the reset plug 433 and the piston ring 42. The reset rod 434 can be made of high-strength insulating plastic, which can transmit the reset force. The reset plug 433 slides in the reset groove 432 to achieve the reset of the piston ring 42.

[0028] In some embodiments, it also includes multiple support plates 5, which are spirally arranged between the insulating inner sleeve 22 and the insulating outer sleeve 21. The support plates 5 can be made of epoxy resin glass cloth plates and fixed by high-temperature resistant epoxy resin glue. The specific size and spacing of the support plates 5 are designed according to actual needs, which can not only increase the structural strength between the insulating inner sleeve 22 and the insulating outer sleeve 21, but also guide the gas to form a spiral flow in the heat dissipation cavity 24, thereby increasing the driving force of the gas on the piston ring 42, thereby improving the driving effect. At the same time, the support rod 431 passes through the support plate 5 to ensure the stability and reliability of the entire heat dissipation structure.

[0029] In some embodiments, the heat dissipation structure 4 further includes a connecting hole 44, a sliding groove 45, a movable plug 46, a vent 47, and a sliding spring 48. The connecting hole 44 extends through the insulating jacket 21. The sliding groove 45 is located on the side of the mounting plate 1 near the insulating jacket 21 and is coaxial with the connecting hole 44, providing space for the movement of the movable plug 46. The movable plug 46 is slidable and sealed within the sliding groove 45. An O-ring or other auxiliary sealing method is used between the movable plug 46 and the sliding groove 45 to ensure sealing. The vent 47 extends through the mounting plate 1 and connects to the top of the sliding groove 45, allowing gas to enter and exit the sliding groove 45. The sliding spring 48 is located between the movable plug 46 and the inner wall of the sliding groove 45 to provide a reset force for the movable plug 46. When the gas pressure in the heat dissipation chamber 24 changes, the movable plug 46 slides within the sliding groove 45, thereby converting the heat in the heat dissipation chamber 24 into the sliding movement of the movable plug 46, further improving the heat dissipation effect. The vent 47 can be provided with a filter and dustproof device to prevent dust and moisture from entering the sliding groove 45.

[0030] In some embodiments, the heat dissipation structure 4 also includes an energy-consuming groove 49 and a limiting baffle. The energy-consuming groove 49 is coaxially arranged on the sliding groove 45 and is connected to the vent 47. It can consume the energy of the movable plug 46 during movement and reduce vibration and impact. The limiting baffle is arranged between the energy-consuming groove 49 and the sliding groove 45, and a sliding spring 48 is provided between the limiting baffle and the movable plug 46, which can limit the sliding range of the movable plug 46 and prevent it from excessive movement.

[0031] In some embodiments, the movable plug 46 includes a plug body 461 and an impact column 462. The plug body 461 is slidable and sealed in the sliding groove 45 and is connected to the sliding spring 48 to realize the basic sliding function of the movable plug 46. The impact column 462 is coaxially arranged at the top of the plug body 461, and a sliding spring 48 is provided on the periphery of the impact column 462.

[0032] In some embodiments, the heat dissipation structure 4 further includes a striker block and a striker spring. The striker block can be slidably disposed in the energy dissipation groove 49 and cooperates with the striker column 462 to consume energy. The striker spring is disposed between the striker block and the inner wall of the energy dissipation groove 49 to provide a reset force for the striker block. The material and size of the striker block and the striker spring are selected according to actual needs to ensure that they can effectively consume energy and provide sufficient reset force. When the movable plug 46 slides, the striker column 462 strikes the striker block, and the striker moves back and forth under the action of the striker spring, converting the heat in the heat dissipation cavity 24 into the elastic potential energy of the striker spring, further consuming energy, and ensuring that the heat generated by the current-carrying conductor 3 can be dissipated in time to meet the heat dissipation requirements during high-load operation.

[0033] In some embodiments, the heat dissipation structure 4 also includes a filter ring, which is arranged between the energy dissipation groove 49 and the vent 47 and can be used to filter the air entering the sliding groove 45 to prevent dust, moisture, etc. from entering and ensure the smooth sliding of the movable plug 46.

[0034] In some embodiments, the heat dissipation structure 4 includes a plurality of connecting holes, which are provided through the insulating inner sleeve 22 and connected to the heat dissipation cavity 24. The layout and size are designed according to actual needs, which can further increase the contact area between the heat dissipation cavity 24 and the current-carrying conductor 3 and improve the heat dissipation efficiency.

[0035] In some embodiments, a phase change material such as paraffin can be filled between the partition plate 41 and the two piston rings 42. When the temperature of the current-carrying conductor 3 reaches the melting point of the phase change material (such as 60°C), the phase change material melts and absorbs latent heat (such as the melting latent heat of paraffin is about 200 kJ / kg), which slows down the expansion rate of the gas between the partition plate 41 and the piston ring 42, increases the gas difference on both sides of the piston ring 42, and facilitates the movement of the piston ring 42. When the temperature between the partition plate 41 and the piston ring 42 drops, the phase change material solidifies and releases heat, which can assist the reset component 43 in pushing the piston ring 42 to reset, forming a closed loop for the conversion of thermal energy and mechanical energy.

[0036] The specific working principle is as follows: The mounting plate 1 is mounted between the power equipment and the wall by means of bolts, thereby achieving fixed installation of the wall bushing between the power equipment and the wall.

[0037] When current-carrying conductor 3 is energized and heated, it generates heat, causing its temperature to rise. This heat is then transferred to insulating inner sleeve 22 through heat conduction, which in turn heats the gas within heat dissipation cavity 24. This heat causes the high-expansion-coefficient gas within heat dissipation cavity 24 to expand, increasing gas pressure and pushing piston ring 42 toward partition plate 41, compressing reset assembly 43. The space between piston ring 42 and partition plate 41 decreases, increasing gas pressure. The gas enters sliding groove 45 of mounting plate 1 through connecting hole 44, pushing movable plug 46 to move, compressing sliding spring 48, and simultaneously striking the impact block within energy dissipation groove 49, consuming the energy carried by the gas and thereby dissipating heat.

[0038] As energy is consumed, the pressure between the piston ring 42 and the partition plate 41 decreases. Due to the poor heat transfer effect of the insulating inner sleeve 22, the reset assembly 43 resets, driving the piston ring 42 to move away from the partition plate 41 and reset. The gas in the heat dissipation cavity 24 continues to heat, causing the high-expansion coefficient gas in the heat dissipation cavity 24 to expand due to the heat. The above process is repeated, achieving continuous heat dissipation, thereby achieving heat dissipation of the current-carrying conductor 3.

[0039] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A wall bushing with a composite insulating support column structure, comprising a mounting plate (1), a support column (2) and a current-carrying conductor (3), characterized in that: The support column (2) comprises an insulating jacket (21), and the insulating jacket (21) is coaxially connected to the mounting plate (1); An insulating inner sleeve (22), wherein the insulating inner sleeve (22) is coaxially provided with the current-carrying conductor (3); Two insulating terminals (23), the two insulating terminals (23) being provided at both ends of the insulating inner sleeve (22) and the insulating outer sleeve (21), and both being provided with the current-carrying conductor (3), and the two insulating terminals (23) and the insulating outer sleeve (21) and the insulating inner sleeve (22) forming a heat dissipation cavity (24), the heat dissipation cavity (24) being filled with a high expansion coefficient gas; It also includes a heat dissipation structure (4), which is arranged in the heat dissipation cavity (24) and can dissipate heat on the current-carrying conductor (3).

2. The wall bushing of the composite insulating support column structure according to claim 1, characterized in that: The heat dissipation structure (4) comprises a partition plate (41), and the partition plate (41) is arranged in the middle of the heat dissipation cavity (24); Two piston rings (42), the two piston rings (42) are coaxially and symmetrically sleeved on the insulating inner sleeve (22), and the piston rings (42) are slidably and sealingly arranged in the heat dissipation cavity (24); A reset assembly (43), wherein the reset assembly (43) is provided between the insulating terminal (23) and the piston ring (42).

3. The wall bushing of the composite insulating support column structure according to claim 2, characterized in that: The reset assembly (43) comprises at least two support rods (431), one end of each support rod (431) being fixedly connected to one of the insulating terminals (23); a reset groove (432), the reset groove (432) being coaxially arranged at an end of the support rod (431) away from the insulating terminal (23); A reset plug (433), the reset plug (433) is slidably and sealingly disposed in the reset groove (432), and a reset liquid is filled between the reset plug (433) and the reset groove (432); A reset rod (434) is provided between the reset plug (433) and the piston ring (42).

4. The wall bushing of the composite insulating support column structure according to claim 3, characterized in that: It also includes a plurality of support plates (5), which are spirally arranged between the insulating inner sleeve (22) and the insulating outer sleeve (21), and through which the support rod (431) is provided.

5. The wall bushing of the composite insulating support column structure according to claim 1, characterized in that: The heat dissipation structure (4) further includes a communication hole (44), wherein the communication hole (44) passes through the insulating jacket (21); a sliding groove (45), the sliding groove (45) being provided on a side of the mounting plate (1) close to the insulating jacket (21) and being coaxially arranged with the communicating hole (44); A movable plug (46), the movable plug (46) being slidable and sealed in the sliding groove (45); a vent hole (47), the vent hole (47) passing through the mounting plate (1) and connected to the top of the sliding groove (45); A sliding spring (48) is provided between the movable plug (46) and the inner wall of the sliding groove (45).

6. The wall bushing of the composite insulating support column structure according to claim 5, characterized in that: The heat dissipation structure (4) further includes an energy dissipation groove (49), which is coaxially arranged on the sliding groove (45) and connected to the vent hole (47); A limit baffle is provided between the energy-consuming groove (49) and the sliding groove (45), and the sliding spring (48) is provided between the limit baffle and the movable plug (46).

7. The wall bushing of the composite insulating support column structure according to claim 5, characterized in that: The movable plug (46) includes a plug body (461), which is slidably and sealingly disposed in the sliding groove (45) and is connected to the sliding spring (48); An impact column (462) is coaxially arranged on the top of the plug body (461), and the sliding spring (48) is arranged on the periphery of the impact column (462).

8. The wall bushing of the composite insulating support column structure according to claim 6, characterized in that: The heat dissipation structure (4) further includes a collision block, which is slidably disposed in the energy dissipation groove (49); An impact spring is provided between the impact block and the inner wall of the energy dissipation groove (49).

9. The wall bushing of the composite insulating support column structure according to claim 6, characterized in that: The heat dissipation structure (4) further comprises a filter ring, which is arranged between the energy dissipation groove (49) and the vent hole (47).

10. The wall bushing of the composite insulating support column structure according to claim 1, characterized in that: The heat dissipation structure (4) comprises a plurality of communication holes, which are provided through the insulating inner sleeve (22) and are connected to the heat dissipation cavity (24).

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