A high-voltage gas-filled cabinet with temperature control

Abstract

The utility model discloses a kind of high-pressure gas-filled cabinets of temperature rise control, the high-pressure gas-filled cabinet of temperature rise control includes gas-filled cabinet body and several sets of pipe arranged thereon, electrically conductive part is equipped in the pipe, the outer surface of the electrically conductive part is covered with heat conduction piece, the heat conduction piece extends to the outer wall of pipe and is fixedly connected with heat conduction pipe, the outer circumference of the heat conduction pipe is evenly distributed with several axially extending and inclinedly arranged heat dissipation fins, and one end of the electrically conductive part towards the inside of gas-filled cabinet body is provided with sealing part. By heat conduction piece tightly covering electrically conductive part, sealed pipe absorbs heat to improve heat dissipation efficiency, heat dissipation fin expands heat dissipation area, reduces operating temperature rise, slows down resistivity rise, reduces thermal expansion difference, prevents structure cracking, improves stability and safety;By designing multilayer sealing structure, the gas-tightness in gas-filled cabinet body is guaranteed, the insulation strength is maintained, and the equipment operation reliability and environmental adaptability are enhanced.

Description

Technical Field

[0001] This utility model relates to the field of power equipment technology, and in particular to a high-voltage gas-filled switchgear for controlling temperature rise. Background Technology

[0002] Gas-insulated switchgear, due to its compact structure, flexible operation, and reliable safety, is widely used in small secondary substations, switching stations, residential communities, and other places, especially in airports, subways, railways, and other locations with high power requirements. High-voltage gas-insulated switchgear is one type of gas-insulated switchgear available today. It integrates various high-voltage components into multiple standard control modules. This configuration allows for various main wiring patterns and meets the needs of different application environments. The interior of the high-voltage gas-insulated switchgear is filled with sulfur hexafluoride gas, which has relatively high insulation strength, creating a relatively sealed structure for the switches and components inside, reducing the impact of the external environment on the high-voltage gas-insulated switchgear.

[0003] Existing high-voltage gas-filled switchgear uses pluggable bushings to achieve electrical connection between external busbar cables and internal electrical equipment. The main body of the bushing is usually made of epoxy resin casting, with copper conductors embedded inside, and SF6 gas or insulating oil medium to meet the operating requirements of voltage levels from 10 to 35kV.

[0004] The plug-in bushing exhibits temperature rise at its electrical connection points. As the main busbar cable current increases, the connection temperature rises accordingly. Because the coefficient of thermal expansion of the epoxy resin matrix is ​​much higher than that of copper, the plug-in bushing generates significant thermal stress during temperature changes, leading to structural stress cracking. This cracking not only affects the bushing's sealing performance but also accelerates its aging process, causing surface cracks to propagate and reducing its overall service life. Simultaneously, the resistivity of the copper conductor increases with temperature, resulting in decreased conductivity and affecting the stability of power transmission. These problems are particularly prominent during the long-term operation of high-voltage gas-filled switchgear, limiting its application performance under high-current, high-load conditions. Based on the aforementioned technical problems, the applicant proposes a new technical solution aimed at effectively addressing the shortcomings of existing technologies. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the traditional high-pressure gas-filled switchgear design and provide a product that improves thermal stability, enhances conductivity, and ensures safe and reliable operation.

[0006] A high-pressure gas-filled cabinet for controlling temperature rise includes a cabinet body and several sleeves disposed thereon. A conductive element is disposed inside each sleeve, and a heat-conducting element is coated on the outer surface of the conductive element. The heat-conducting element extends to the outer wall of the sleeve and is fixedly connected to the heat-conducting sleeve. Several axially extending and inclined heat dissipation fins are evenly distributed on the outer circumference of the heat-conducting sleeve. A sealing part is provided at one end of the conductive element facing the interior of the cabinet body. The sealing part is in a sealing fit with the inner wall of the sleeve. A radially protruding abutment is provided on the end face of the sealing part. A clamping nut is provided at the inner end of the sleeve. The clamping nut is fitted onto the outer wall of the sealing part and applies a clamping force to the abutment. O-rings are provided between the sealing part and the inner wall of the sleeve, and between the clamping nut and the sealing part.

[0007] Preferably, the sleeve is provided with a flange, and the flange has a groove at one end facing the gas cabinet body for the sleeve to enter. A sealing gasket is embedded in the groove. The sealing gasket has an extension that extends to the end face of the flange. The flange is provided with a plurality of fastening screws evenly distributed along the circumferential direction and passes through the extension to be fixedly connected to the gas cabinet body.

[0008] Preferably, the sleeve has a connecting part at one end of the flange and is placed outside the gas chamber body, and the end face of the connecting part has a tapered heat dissipation part.

[0009] Preferably, the sleeve has a connecting sleeve at the other end of the flange and is placed inside the gas chamber body. The inner wall of the connecting sleeve has a threaded groove that engages with the threaded groove of the compression nut. The connecting sleeve has an insulating part that wraps around the conductive part. The outer wall of the insulating part has a supporting part that abuts against the contacting part.

[0010] Preferably, the sealing part is fitted onto the outer surface of the insulating part.

[0011] Preferably, the inner wall of the heat-conducting sleeve is provided with a first conical contact surface that matches the conical heat dissipation part, and a thermally conductive silicone grease layer is filled between the first conical contact surface and the conical heat dissipation part. The outer surface of the heat-conducting sleeve is provided with a second conical contact surface, and the heat dissipation fins are disposed on the second conical contact surface.

[0012] Preferably, the outer surface of the conductive component is provided with a groove to accommodate the heat-conducting component, so that the outer surfaces of the conductive component and the heat-conducting component are flush, and a thermal grease layer is provided between the conductive component and the heat-conducting component.

[0013] Preferably, both ends of the conductive component are provided with insertion holes for inserting busbar connectors. Beneficial effects

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: (1) In this utility model, the heat generated by the conductive component is effectively conducted to the heat-conducting component and the sleeve by tightly wrapping the conductive component with the heat-conducting component. The sealed sleeve not only absorbs the heat of the conductive component, but also absorbs the heat of the sleeve itself, thereby improving the overall heat conduction efficiency. The inclined heat dissipation fins increase the contact area with the air, enhance the heat dissipation capacity in the air, improve the heat exchange efficiency, and reduce the operating temperature of the conductive component and its connection with the sleeve. The temperature drop helps to slow down the trend of the resistivity increase of the conductive component and maintain a high conductivity. At the same time, it reduces the thermal expansion difference between the epoxy resin sleeve and the copper conductive component, reduces the accumulation of thermal stress, and prevents structural cracking and deterioration of sealing performance. This design improves the overall structural stability, extends the service life, and enhances the safety of equipment operation. In addition, the optimized thermal management scheme helps to improve the reliability of equipment operation under high load conditions, adapt to more complex environmental conditions, and enhance the overall adaptability and durability of the system.

[0015] (2) In this utility model, an O-ring is set between the sealing part and the inner wall of the sleeve, and between the pressing thread and the sealing part to form a double internal sealing structure, which improves the sealing reliability. The flange is connected to the cabinet through the sealing gasket of the extension part and the fastening screw, ensuring that an interface seal is formed between the sleeve and the cabinet. The multi-layer sealing design enhances the sealing performance of SF6 gas in the gas-filled cabinet body, prevents gas leakage, maintains insulation strength, and improves the stability of equipment operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a high-pressure gas-filled cabinet for controlling temperature rise according to the present invention; Figure 2 This utility model Figure 1 A magnified view of part A; Figure 3 This is a side cross-sectional view of a high-pressure gas-filled cabinet for controlling temperature rise according to the present invention. Figure 4 This utility model Figure 3 A magnified view of section B; Figure 5 This is an exploded structural diagram of a high-pressure gas-filled cabinet for controlling temperature rise according to the present invention. The correspondence between the labels and component names in the attached figures is as follows: Reference numerals: 1. Gas-filled cabinet body; 2. Sleeve; 3. Conductive component; 4. Thermal component; 5. Compression nut; 6. O-ring seal; 7. Sealing gasket; 21. Flange; 22. Countersunk groove; 23. Fastening screw; 24. Connecting part; 25. Conical heat dissipation part; 26. Connecting sleeve; 27. Insulating part; 28. Supporting part; 261. Threaded groove; 31. Sealing part; 32. Abutting part; 33. Groove; 34. Insertion hole; 41. Thermally conductive sleeve; 42. Heat dissipation fins; 43. First conical contact surface; 44. Second conical contact surface; 71. Extension. Detailed Implementation

[0017] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0018] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0020] Reference example Figures 1 to 5 A high-pressure gas-filled cabinet for controlling temperature rise includes a gas-filled cabinet body 1 and several sleeves 2 disposed thereon. A conductive element 3 is disposed inside the sleeve 2. A heat-conducting element 4 is covered on the outer surface of the conductive element 3. The heat-conducting element 4 extends to the outer wall of the sleeve 2 and is fixedly connected to a heat-conducting sleeve 412. Several axially extending and inclined heat dissipation fins 42 are evenly distributed on the outer circumference of the heat-conducting sleeve 412. A sealing part 31 is provided at one end of the conductive element 3 facing the inside of the gas-filled cabinet body 1. The sealing part 31 is sealed and fitted with the inner wall of the sleeve 2. A radially protruding abutment part 32 is provided on the end face of the sealing part 31. A clamping nut 5 is provided at the inner end of the sleeve 2. The clamping nut 5 is sleeved on the outer wall of the sealing part 31 and applies a clamping force to the abutment part 32. O-rings 6 are provided between the sealing part 31 and the inner wall of the sleeve 2, and between the clamping nut 5 and the sealing part 31. By tightly wrapping the conductive component 3 with the heat-conducting component 4, the heat generated by the conductive component 3 can be effectively conducted to the heat-conducting component 4 and the sleeve 2. The sealed sleeve 2 not only absorbs the heat of the conductive component 3, but also absorbs the heat of the sleeve 2 itself, improving the overall heat conduction efficiency. The inclined heat dissipation fins 42 increase the contact area with the air, enhance the heat dissipation ability in the air, improve the heat exchange efficiency, and reduce the operating temperature of the conductive component 3 and its connection with the sleeve 2. The temperature drop helps to slow down the increase in resistivity of the conductive component 3, maintain high conductivity, and at the same time, reduce the difference in thermal expansion between the epoxy resin sleeve 2 and the copper conductive component 3, reduce the accumulation of thermal stress, prevent structural cracking and deterioration of sealing performance. This design improves the overall structural stability, extends the service life, and enhances the safety of equipment operation. In addition, the optimized thermal management scheme helps to improve the reliability of equipment operation under high load conditions, adapt to more complex environmental conditions, and enhance the overall adaptability and durability of the system. It is worth mentioning that the sleeve 2 is provided with a flange 21. The flange 21 has a groove 22 at the end facing the opening position of the gas cabinet body 1 for the sleeve 2 to enter. The groove 22 is embedded with a sealing gasket 7. The sealing gasket 7 has an extension 71 extending to the end face of the flange 21. The flange 21 is evenly provided with a number of fastening screws 23 along the circumferential direction, and passes through the extension 71 to be fixedly connected to the gas cabinet body 1. An O-ring 6 is provided between the sealing part 31 and the inner wall of the sleeve 2, and between the compression thread and the sealing part 31, forming a double internal sealing structure to improve the sealing reliability. The flange 21 is connected to the cabinet body through the sealing gasket 7 of the extension 71 and the fastening screws 23 to ensure that an interface seal is formed between the sleeve 2 and the cabinet body. The multi-layer sealing design enhances the sealing performance of SF6 gas in the gas cabinet body 1, prevents gas leakage, maintains insulation strength, and improves the stability of equipment operation. It is worth mentioning that the sleeve 2 has a connecting part 24 at one end of the flange 21 and is placed outside the gas cabinet body 1. The end face of the connecting part 24 is provided with a tapered heat dissipation part 25. The tapered heat dissipation part 25 increases the contact area with the heat-conducting sleeve 412 and improves the heat conduction efficiency. It is worth mentioning that the sleeve 2 is provided with a connecting sleeve 26 at the other end of the flange 21 and is placed inside the gas cabinet body 1. The inner wall of the connecting sleeve 26 is provided with a threaded groove 261 that engages with the thread of the clamping nut 5. The connecting sleeve 26 is provided with an insulating part 27 that wraps around the conductive part 3. The outer wall of the insulating part 27 is provided with a supporting part 28 that abuts against the contact part 32. When the clamping nut 5 applies an upward force to the contact part 32, the contact part 32 and the supporting part 28 fit tightly together, thereby enhancing the sealing between the two contact interfaces. It is worth mentioning that the sealing part 31 is sleeved on the outer surface of the insulating part 27, and the sealing part 31 and the insulating part 27 form a labyrinth-type sealing structure, which, together with the O-ring 6, further increases the sealing performance. It is worth mentioning that the inner wall of the heat-conducting sleeve 41 is provided with a first conical contact surface 43 that matches the conical heat dissipation part 25. A thermally conductive silicone grease layer is filled between the first conical contact surface 43 and the conical heat dissipation part 25. The outer surface of the heat-conducting sleeve 412 is provided with a second conical contact surface 44, and the heat dissipation fins 42 are disposed on the second conical contact surface 44. The thermally conductive silicone grease layer reduces the contact gap between the first conical contact surface 43 and the heat-conducting sleeve 412, thereby improving the thermal conductivity. It is worth mentioning that the outer surface of the conductive component 3 is provided with a groove 33 to accommodate the heat-conducting component 4, so that the outer surfaces of the conductive component 3 and the heat-conducting component 4 are flush. A thermal grease layer is provided between the conductive component 3 and the heat-conducting component 4. The thermal grease layer not only has an insulating effect, but also effectively reduces the contact gap between the conductive component 3 and the heat-conducting component 4, and improves the thermal conductivity. It is worth mentioning that both ends of the conductive component 3 are provided with sockets 34 for inserting busbar connectors.

[0021] The above design scheme can enable the product to achieve the advantages of improved thermal stability, enhanced conductivity, and safe and reliable operation.

[0022] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A high-pressure gas-filled switchgear for controlling temperature rise, comprising a switchgear body (1) and a plurality of sleeves (2) disposed thereon, wherein a conductive element (3) is provided inside the sleeves (2), characterized in that: The conductive component (3) is covered with a heat-conducting component (4). The heat-conducting component (4) extends to the outer wall of the sleeve (2) and is fixedly connected to the heat-conducting sleeve (41)(2). Several axially extending and inclined heat dissipation fins (42) are evenly distributed on the outer circumference of the heat-conducting sleeve (41)(2). The conductive component (3) has a sealing part (31) at one end facing the inside of the gas cabinet body (1). The sealing part (31) is sealed to the inner wall of the sleeve (2). The end face of the sealing part (31) has a radially protruding contact part (32). The inner end of the sleeve (2) has a clamping nut (5). The clamping nut (5) is sleeved on the outer wall of the sealing part (31) and applies a clamping force to the contact part (32). O-rings (6) are provided between the sealing part (31) and the inner wall of the sleeve (2) and between the clamping nut (5) and the sealing part (31).

2. The high-pressure gas-filled switchgear for controlling temperature rise according to claim 1, characterized in that: The sleeve (2) is provided with a flange (21). The flange (21) has a groove (22) at one end facing the opening position of the gas cabinet body (1) for the sleeve (2) to enter. A sealing gasket (7) is embedded in the groove (22). The sealing gasket (7) has an extension (71) extending to the end face of the flange (21). The flange (21) is provided with a number of fastening screws (23) evenly distributed along the circumferential direction, and passes through the extension (71) to be fixedly connected to the gas cabinet body (1).

3. The high-pressure gas-filled switchgear for controlling temperature rise according to claim 2, characterized in that: The sleeve (2) has a connecting part (24) at one end of the flange (21) and is placed outside the gas cabinet body (1). The end face of the connecting part (24) is provided with a tapered heat dissipation part (25).

4. The high-pressure gas-filled switchgear for controlling temperature rise according to claim 2, characterized in that: The sleeve (2) has a connecting sleeve (26) at the other end of the flange (21) and is placed inside the gas cabinet body (1). The inner wall of the connecting sleeve (26) has a threaded groove (261) that engages with the threaded clamping nut (5). The connecting sleeve (26) has an insulating part (27) that wraps around the conductive part (3). The outer wall of the insulating part (27) has a supporting part (28) that abuts against the contacting part (32).

5. The high-pressure gas-filled switchgear for controlling temperature rise according to claim 4, characterized in that: The sealing part (31) is fitted onto the outer surface of the insulating part (27).

6. The high-pressure gas-filled switchgear for controlling temperature rise according to claim 3, characterized in that: The inner wall of the heat-conducting sleeve (41) is provided with a first conical contact surface (43) that matches the conical heat dissipation part (25). A thermally conductive silicone grease layer is filled between the first conical contact surface (43) and the conical heat dissipation part (25). The outer surface of the heat-conducting sleeve (41)(2) is provided with a second conical contact surface (44). The heat dissipation fins (42) are disposed on the second conical contact surface (44).

7. The high-pressure gas-filled switchgear for controlling temperature rise according to claim 1, characterized in that: The outer surface of the conductive component (3) is provided with a groove (33) to accommodate the heat-conducting component (4), so that the outer surfaces of the conductive component (3) and the heat-conducting component (4) are flush, and a thermal grease layer is provided between the conductive component (3) and the heat-conducting component (4).

8. The high-pressure gas-filled switchgear for controlling temperature rise according to claim 1, characterized in that: Both ends of the conductive component (3) are provided with insertion holes (34) for inserting busbar connectors.

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