An electrical insulation protection device for a thermal power plant

Abstract

This invention relates to the field of electrical insulation protection technology and discloses an electrical insulation protection device for a thermal power plant, comprising an outer insulating shell, an inner insulating sleeve, a support assembly, an air inlet assembly, an air outlet assembly, and a flow guiding assembly. The inner insulating sleeve is disposed inside the outer insulating shell, forming an annular air circulation cavity with the outer insulating shell. The support assembly is used to fix the inner insulating sleeve and maintain airflow. The flow guiding assembly is used to guide airflow. The air outlet assembly includes a non-powered air cap. The heat generated during the operation of the electrical connection parts drives the airflow within the annular air circulation cavity, allowing hot and humid air to be discharged through the air outlet assembly and replenished with external air through the air inlet assembly, thereby reducing the risk of condensation inside the device and improving the insulation protection performance of the electrical connection parts.

Description

Technical Field

[0001] This invention relates to the field of electrical insulation protection technology, and in particular to an electrical insulation protection device for thermal power plants. Background Technology

[0002] Thermal power plants require numerous electrical connections during operation, such as cable joints, busbar connections, and electrical equipment terminals. Since these connections operate under high voltage and high current conditions, their insulation performance directly impacts the safety and reliability of the electrical equipment. Current technology typically employs insulating protective covers to encase these connections, preventing dust, moisture, and mechanical impacts from the external environment from affecting the connections and simultaneously improving the insulation protection of the electrical connection locations.

[0003] However, the operating environment of thermal power plants is typically characterized by high temperatures and significant humidity fluctuations. Most existing insulation protection devices employ a closed structure with limited internal airflow. When electrical connections generate heat during prolonged operation, this heat tends to accumulate inside the insulation protection device, causing changes in the internal air temperature. Simultaneously, when equipment is shut down or the ambient temperature drops, moisture in the air can condense on the internal surface of the insulation protection device, leading to dampness on the insulating material surface, decreased insulation performance, and potentially even safety issues such as partial discharge and insulation breakdown.

[0004] To address the aforementioned issues, some existing technologies reduce the risk of condensation by adding heating elements, installing sealing and moisture-proof materials, or adding external ventilation equipment. However, these methods typically require additional energy supply or increase equipment complexity, leading to high maintenance costs and insufficient structural adaptability during long-term operation. Furthermore, existing insulation protection devices usually only focus on the mechanical protection and insulation isolation of electrical connections, lacking structural designs that utilize the heat generated during equipment operation to improve the internal air environment. Therefore, it is necessary to provide an electrical insulation protection device for thermal power plants that is simple in structure, requires no additional power input, and can utilize the heat generated during electrical equipment operation to achieve internal air circulation, thereby reducing the risk of condensation. Summary of the Invention

[0005] The present invention aims to at least solve the technical problems existing in the prior art, and proposes an electrical insulation protection device for thermal power plants.

[0006] To achieve the above-mentioned objectives of the present invention, the present invention provides an electrical insulation protection device for thermal power plants, comprising an outer insulating shell, an inner insulating sleeve, a support assembly, an air inlet assembly, an exhaust assembly, and a flow guiding assembly; the inner insulating sleeve is disposed inside the outer insulating shell, forming an annular air circulation cavity between the inner insulating sleeve and the outer insulating shell; the support assembly is respectively disposed at both ends of the inner insulating sleeve for fixing the inner insulating sleeve inside the outer insulating shell and keeping the annular air circulation cavity connected along the axial direction of the outer insulating shell; the air inlet assembly is connected to one end of the annular air circulation cavity; the exhaust assembly is disposed on the upper part of the outer insulating shell and connected to the annular air circulation cavity, and the exhaust assembly includes a non-powered wind cap; the flow guiding assembly is disposed inside the annular air circulation cavity for guiding air to flow along the annular air circulation cavity; wherein, the heat generated during the operation of the electrical connection parts is transferred to the annular air circulation cavity through the inner insulating sleeve, causing the air to flow along the flow guiding assembly and be discharged through the exhaust assembly, while external air enters the annular air circulation cavity through the air inlet assembly, thereby forming an air circulation.

[0007] Optionally, the support assembly includes an outer ring fixed to the inner wall of the outer insulating shell, an inner ring fixed to the outer wall of the inner insulating sleeve, and multiple connecting ribs connecting the outer ring and the inner ring, with an air circulation channel formed between two adjacent connecting ribs.

[0008] Optionally, multiple connecting ribs are evenly spaced along the circumference of the inner insulating sleeve.

[0009] Optionally, the flow guiding assembly includes a spiral flow guiding rib disposed on the outer wall of the inner insulating sleeve, the spiral flow guiding rib extending obliquely along the axial direction of the inner insulating sleeve.

[0010] Optionally, the spiral guide ribs extend continuously along the outer periphery of the inner insulating sleeve to form a spiral guide channel.

[0011] Optionally, the non-powered wind cap includes an exhaust pipe, a rotating assembly rotatably disposed on top of the exhaust pipe, and multiple inclined blades disposed on the outer periphery of the rotating assembly; the inclined blades are used to drive the rotating assembly to rotate as air flows through the exhaust pipe.

[0012] Optionally, the rotating assembly includes a rotating shaft, a rotating ring, and a protective cover. The two ends of the inclined blade are fixedly connected to the protective cover and the rotating ring, respectively. One end of the rotating shaft is connected to the protective cover through a bearing, and the other end is connected to the inner wall of the exhaust pipe through a bearing.

[0013] Optionally, the air intake assembly includes a plurality of air intake holes disposed at the lower part of the outer insulating housing, the plurality of air intake holes being spaced apart circumferentially along the outer insulating housing.

[0014] Optionally, the inner insulating sleeve may be made of a thermally conductive insulating material.

[0015] Optionally, the annular air circulation cavity is continuously connected along the axial direction of the outer insulating shell and is connected to the air intake assembly and the air exhaust assembly respectively, so as to form an air circulation channel independent of the inner insulating sleeve cavity.

[0016] The beneficial effects of this invention are that by setting an inner insulating sleeve inside the outer insulating shell and utilizing the annular air circulation cavity formed between the inner insulating sleeve and the outer insulating shell, the electrical connection parts and the air circulation area are isolated from each other, ensuring the insulation protection performance of the electrical connection parts while providing an independent channel for air flow. By setting a support assembly to fix the inner insulating sleeve and utilizing the air flow channel in the support assembly to maintain the continuity of the annular air circulation cavity, air can circulate between the outer insulating shell and the inner insulating sleeve.

[0017] This invention utilizes the heat generated during the operation of the electrical connection parts to transfer to the annular air circulation cavity through the inner insulating sleeve, thereby raising the air temperature and creating a flow trend. In conjunction with the non-powered vent cap set on the outer insulating shell, the hot and humid air can be discharged along the direction guided by the air guiding component. At the same time, external air is replenished into the annular air circulation cavity through the air intake component, thus forming an air circulation process that does not require additional power to drive, reducing the possibility of moisture accumulation inside the insulation protection device.

[0018] Furthermore, by setting spiral guide ribs on the outer wall of the inner insulating sleeve, the air entering the annular air circulation cavity flows along an inclined path, extending the airflow path within the circulation cavity and improving the heat exchange effect between the air and the inner insulating sleeve, which is beneficial to improving the stability of the internal environment of the insulation protection device. By setting a non-powered wind cap, the airflow is used to drive the rotating component to rotate during the airflow process, enhancing the exhaust effect, while avoiding the problems of power supply and maintenance required by traditional electric fans, thus improving the operational reliability of the device.

[0019] Furthermore, the air circulation area in this invention is independently set between the outer insulating shell and the inner insulating sleeve, so that the air will not directly contact the electrical connection parts. While achieving the anti-condensation function, it will not damage the original insulation isolation environment of the electrical connection area, and is suitable for insulation protection of electrical connection parts in the complex operating environment of thermal power plants.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2This is an internal sectional view of the present invention.

[0022] Reference numerals: 1. Outer insulating shell; 2. Inner insulating sleeve; 3. Annular air circulation cavity; 4. Support assembly; 5. Outer ring; 6. Inner ring; 7. Connecting rib; 8. Air intake assembly; 9. Air intake hole; 10. Exhaust assembly; 11. Exhaust pipe; 12. Non-powered wind cap; 13. Rotating assembly; 14. Rotating shaft; 15. Rotating ring; 16. Inclined blade; 17. Protective cover; 18. Bearing; 19. Flow guide assembly; 20. Spiral flow guide rib. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] like Figure 1 and Figure 2 As shown, this embodiment provides an electrical insulation protection device for a thermal power plant, including an outer insulating shell 1, an inner insulating sleeve 2, a support assembly 4, an air intake assembly 8, an exhaust assembly 10, and a flow guiding assembly 19.

[0025] The outer insulating shell 1 is a horizontally arranged cylindrical structure used to provide external protection for the internal electrical connections. The outer insulating shell 1 is made of insulating material to improve the overall insulation performance of the device. The inner insulating sleeve 2 is located inside the outer insulating shell 1 and is coaxially arranged with it. The inner insulating sleeve 2 covers the electrical connections, isolating them from the external environment. The inner cavity of the inner insulating sleeve 2 accommodates the electrical connections, and the inner insulating sleeve 2 is spaced apart from the outer insulating shell 1 to form an annular air circulation cavity 3.

[0026] The annular air circulation chamber 3 extends axially along the outer insulating shell 1 and is located between the outer insulating shell 1 and the inner insulating sleeve 2, serving as a space for air circulation. The annular air circulation chamber 3 is isolated from the inner cavity of the inner insulating sleeve 2, so that air only flows within the annular air circulation chamber 3 and does not directly enter the area where the electrical connection is located, thereby maintaining the original insulation isolation state of the electrical connection while achieving air circulation dehumidification.

[0027] The inner insulating sleeve 2 is fixedly mounted inside the outer insulating shell 1 by a support assembly 4. The support assembly 4 is located at both ends of the inner insulating sleeve 2 and includes an outer ring 5 fixed to the inner wall of the outer insulating shell 1, an inner ring 6 fixed to the outer wall of the inner insulating sleeve 2, and multiple connecting ribs 7 connecting the outer ring 5 and the inner ring 6. The connecting ribs 7 are spaced apart along the circumference of the inner insulating sleeve 2 to maintain a stable connection between the inner insulating sleeve 2 and the outer insulating shell 1. An airflow channel is formed between two adjacent connecting ribs 7, thereby preventing the support assembly 4 from blocking the annular air circulation cavity 3 and allowing air to flow continuously along the axial direction of the outer insulating shell 1.

[0028] An air intake assembly 8 is located at one end of the outer insulating housing 1 and communicates with the annular air circulation chamber 3. The air intake assembly 8 includes multiple air intake holes 9 located at the lower part of the outer insulating housing 1. The multiple air intake holes 9 are spaced apart circumferentially along the outer insulating housing 1 to allow external air to enter the annular air circulation chamber 3. The number of air intake holes 9 can be set according to the actual installation environment to ensure a stable supply of external air.

[0029] The exhaust assembly 10 is disposed on the upper part of the outer insulating housing 1 and communicates with the annular air circulation chamber 3, for discharging the humid and hot air in the annular air circulation chamber 3. The exhaust assembly 10 includes an exhaust pipe 11 and a non-powered wind cap 12 disposed on the top of the exhaust pipe 11.

[0030] The non-powered vent cap 12 is used to rotate by the force generated by airflow to enhance the exhaust capacity of the exhaust assembly 10. Specifically, the non-powered vent cap 12 includes a rotating assembly 13 and a plurality of inclined blades 16 disposed on the outer periphery of the rotating assembly 13. The rotating assembly 13 includes a rotating shaft 14, a rotating ring 15, and a protective cover 17. One end of the inclined blades 16 is fixedly connected to the rotating ring 15, and the other end is fixedly connected to the protective cover 17. One end of the rotating shaft 14 is connected to the protective cover 17 through a bearing 18, and the other end is connected to the inner wall of the exhaust pipe 11 through a bearing 18, so that the rotating assembly 13 can rotate relative to the exhaust pipe 11.

[0031] When the air in the annular air circulation chamber 3 flows outward through the exhaust pipe 11, the airflow acts on the inclined blades 16, causing the inclined blades 16 to be driven by a circumferential force, thereby driving the rotating ring 15, the protective cover 17 and the rotating shaft 14 to rotate together, promoting the airflow inside the exhaust pipe 11 and improving the smoothness of the discharge of hot and humid air.

[0032] Furthermore, a drain hole is provided at the bottom of the exhaust assembly 10 to drain any condensate that may be generated inside the exhaust assembly 10. When the external humidity is high or the equipment is shut down, moisture in the air may condense inside the exhaust assembly 10 to form a small amount of condensate. The drain hole allows the condensate to be drained in a timely manner, preventing condensate from accumulating inside the exhaust assembly 10.

[0033] The airflow guiding assembly 19 is disposed inside the annular air circulation cavity 3 to guide air to flow in a predetermined direction. Specifically, the airflow guiding assembly 19 includes a spiral airflow guiding rib 20 disposed on the outer wall of the inner insulating sleeve 2. The spiral airflow guiding rib 20 extends obliquely along the axial direction of the inner insulating sleeve 2 and is continuously disposed along the outer periphery of the inner insulating sleeve 2, thereby forming a spiral airflow path in the annular air circulation cavity 3.

[0034] During the operation of a thermal power plant, the heat generated at the electrical connection points is first transferred to the inner insulating sleeve 2, and then further transferred through the inner insulating sleeve 2 to the annular air circulation chamber 3, causing the air temperature inside the annular air circulation chamber 3 to rise. Due to the temperature change, the air tends to flow, and guided by the spiral guide ribs 20, the air flows along the annular air circulation chamber 3 and eventually enters the exhaust assembly 10, where it is discharged through the non-powered air cap 12. Simultaneously, external air is replenished into the annular air circulation chamber 3 through the air inlet 9, thus forming a continuous air circulation process.

[0035] Through the above structure, this embodiment utilizes the independent air circulation space formed between the outer insulating shell 1 and the inner insulating sleeve 2, isolating the air circulation process from the electrical connection parts, and improving the internal air environment of the protection device without affecting the insulation protection performance. Simultaneously, the support component 4 ensures the stable installation of the inner insulating sleeve 2, the airflow path is optimized by the air guiding component 19, and the non-powered air cap 12 assists in the discharge of hot and humid air, thereby reducing the possibility of condensation inside the protection device and improving the safety and reliability of the electrical connection parts during operation in thermal power plants.

[0036] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An electrical insulation protection device for thermal power plants, characterized in that, It includes an outer insulating housing, an inner insulating sleeve, a support assembly, an intake assembly, an exhaust assembly, and a flow guiding assembly; The inner insulating sleeve is disposed inside the outer insulating shell, and an annular air circulation cavity is formed between the inner insulating sleeve and the outer insulating shell; The support components are respectively disposed at both ends of the inner insulating sleeve, for fixing the inner insulating sleeve inside the outer insulating shell, and keeping the annular air circulation cavity connected along the axial direction of the outer insulating shell; The air intake assembly is connected to one end of the annular air circulation chamber; The exhaust assembly is disposed on the upper part of the outer insulating housing and communicates with the annular air circulation cavity. The exhaust assembly includes a non-powered wind cap. The flow guiding component is disposed inside the annular air circulation chamber and is used to guide air to flow along the annular air circulation chamber. During operation, the heat generated by the electrical connection is transferred to the annular air circulation cavity through the inner insulating sleeve, causing the air to flow along the guide assembly and be discharged through the exhaust assembly. At the same time, external air enters the annular air circulation cavity through the intake assembly, thereby forming an air circulation.

2. The electrical insulation protection device for thermal power plants as described in claim 1, characterized in that, The support assembly includes an outer ring fixed to the inner wall of the outer insulating shell, an inner ring fixed to the outer wall of the inner insulating sleeve, and a plurality of connecting ribs connecting the outer ring and the inner ring, with an air circulation channel formed between two adjacent connecting ribs.

3. The electrical insulation protection device for thermal power plants as described in claim 2, characterized in that, The multiple connecting ribs are evenly spaced along the circumferential direction of the inner insulating sleeve.

4. The electrical insulation protection device for thermal power plants as described in claim 1, characterized in that, The flow guiding assembly includes a spiral flow guiding rib disposed on the outer wall of the inner insulating sleeve, the spiral flow guiding rib extending obliquely along the axial direction of the inner insulating sleeve.

5. The electrical insulation protection device for thermal power plants as described in claim 4, characterized in that, The spiral guide ribs extend continuously along the outer periphery of the inner insulating sleeve to form a spiral guide channel.

6. The electrical insulation protection device for thermal power plants as described in claim 1, characterized in that, The non-powered wind cap includes an exhaust pipe, a rotating assembly rotatably disposed on the top of the exhaust pipe, and a plurality of inclined blades disposed on the outer periphery of the rotating assembly; The tilting blades are used to drive the rotating assembly to rotate as air flows through the exhaust pipe.

7. The electrical insulation protection device for thermal power plants as described in claim 6, characterized in that, The rotating assembly includes a rotating shaft, a rotating ring, and a protective cover. The two ends of the inclined blade are fixedly connected to the protective cover and the rotating ring, respectively. One end of the rotating shaft is connected to the protective cover through a bearing, and the other end is connected to the inner wall of the exhaust pipe through a bearing.

8. The electrical insulation protection device for thermal power plants as described in claim 1, characterized in that, The air intake assembly includes a plurality of air intake holes disposed at the lower part of the outer insulating housing, and the plurality of air intake holes are spaced apart along the circumference of the outer insulating housing.

9. The electrical insulation protection device for thermal power plants as described in claim 1, characterized in that, The inner insulating sleeve is made of thermally conductive insulating material.

10. The electrical insulation protection device for a thermal power plant as described in claim 1, characterized in that, The annular air circulation cavity extends continuously along the axial direction of the outer insulating shell and is connected to the air intake assembly and the air exhaust assembly respectively, so as to form an air circulation channel independent of the inner insulating sleeve cavity.

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