Wide-angle self-adjusting contact device suitable for GIL and use method of large-angle self-adjusting contact device

Abstract

The invention provides a large-angle self-adjusting contact device suitable for a GIL and a use method of the large-angle self-adjusting contact device, and belongs to the technical field of high-voltage power transmission. The bottom of the moving contact is in sliding insertion connection with the inner top of the contact assembly frame, the top of the static contact is rotationally connected with the inner bottom of the contact assembly frame, and a shielding cover is arranged on the outer side of the contact assembly frame; the contact assembly frame comprises a contact finger frame, and a plurality of dry contact fingers are uniformly arranged on the contact finger frame along the circumferential direction of the contact finger frame; the top of the static contact is provided with a connecting ball head, and the outer side of the contact finger is sleeved with contact finger springs at intervals along the length direction of the contact finger. The invention is suitable for GIL, can realize large-angle self-adjustment in a 150-degree range, can accurately compensate the angle deflection of the moving / static contact caused by differential settlement of a foundation, ensures the reliable full-angle contact through the contact finger spring, ensures the stability of an electric field through the synchronous rotation of the shielding case, reduces the cost through part standardization, ensures the long-term safe operation of equipment, and improves the working efficiency. The popularization is facilitated.

Description

Technical Field

[0001] This invention relates to the field of high-voltage power transmission technology, and in particular to a large-angle self-adjusting contact device suitable for GIL and its usage method. Background Technology

[0002] GIL (Gas Insulated Metal Enclosed Transmission Line) is a core technology for high-capacity, long-distance power transmission and is widely used in scenarios such as undergrounding urban power grids and power transmission in special environments. Its operational reliability depends on the stable contact of the connection joints in each section of the line. Because GIL installation needs to be adapted to complex terrain and the foundation is prone to uneven settlement during the 30-40 year service life of the equipment, the connection joints are required to have angle deflection compensation capabilities to avoid abnormal stress on the support components.

[0003] In existing technologies, the relevant angle adjustment structures have obvious limitations in practical use: some power transmission support equipment, such as the Chinese patent application publication number CN104989155A which discloses a power transmission device, achieves fine adjustment of the column verticality through ball-rotation locking seat and conical surface cooperation, but it is only applicable to the overall support structure and cannot meet the precise angle compensation requirements of contact connection; there are also pressing mechanisms, such as the Chinese patent authorization publication number CN201780970U which discloses a thyristor pressing mechanism for DC power transmission converter valve, which uses a ball head-ball socket structure to adjust the pressure distribution, and the core objective is to ensure the uniformity of pressing, which is unrelated to the adaptive contact angle. Existing solutions for GIL contacts mostly achieve fixed-angle assembly by machining special mounting surfaces. Each contact is only suitable for one type of angle condition. The standardization of parts is low, which is not conducive to quality and cost control. Moreover, machining and assembly errors can easily lead to abnormal stress on the moving and stationary contacts. Even if some structures can compensate for deflection, the effective compensation angle is only ±3°, which cannot cope with the large angle displacement caused by uneven foundation settlement, posing a safety hazard.

[0004] Therefore, the industry urgently needs a GIL contact structure that can achieve large-angle adaptive adjustment, adapt to various assembly conditions, and reliably compensate for angle deflection caused by foundation settlement, in order to solve the technical defects in the existing technology. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies, such as low angle adjustment accuracy, small effective compensation angle range, and poor adaptability, and to provide a large-angle self-adjusting contact device suitable for GIL.

[0006] This invention is achieved through the following technical solution: a large-angle self-adjusting contact device suitable for GIL, comprising a moving contact, a stationary contact, and a contact assembly frame; the bottom of the moving contact is slidably inserted into the inner top of the contact assembly frame, and the top of the stationary contact is rotatably connected to the inner bottom of the contact assembly frame; the contact assembly frame includes a finger frame, on which several fingers are evenly arranged circumferentially, and the fingers and the finger frame can be enclosed to form a cylindrical structure; after the bottom of the moving contact is slidably inserted into the inner top of the cylindrical structure, the moving contact is in contact with the inner side of the top of the finger. The stationary contact is provided with a connecting ball head at its top. The inner side of the bottom of the contact finger is provided with an arc surface A that is adapted to the connecting ball head. The arc surface A can form an assembly ball groove for installing the connecting ball head. The connecting ball head is rotatably connected to the contact finger frame through a pin, and the connecting ball head slides against the inside of the assembly ball groove. Several contact finger springs are sleeved at intervals along the length of the outer side of the contact finger. The contact finger springs can apply contact pressure between the contact finger and the moving contact / connecting ball head. A shielding cover is provided on the outer side of the contact assembly frame. The shielding cover can rotate synchronously with the contact assembly frame.

[0007] The bottom of the moving contact slides into the cylindrical structure enclosed by the contact finger, and forms a conductive contact with the inner side of the top of the contact finger; the connecting ball head of the stationary contact is rotatably connected to the contact finger frame through a pin, and slides in the assembly ball groove enclosed by the arc surface A of the contact finger; the contact finger spring applies pressure along the length of the contact finger to ensure that the contact finger, moving contact, and connecting ball head are always in close contact; the shielding cover rotates synchronously with the contact assembly frame, and always covers the contact assembly area.

[0008] This device achieves adaptive adjustment within a large angle range of 150° by connecting the ball head and the assembly ball groove and rotating the contact finger frame. It effectively compensates for the angle deflection of the moving and stationary contacts caused by uneven foundation settlement. The elastic pressure of the contact finger spring ensures reliable contact during the full-angle adjustment process. The synchronous rotation of the shielding cover ensures a stable electric field distribution and guarantees the long-term safe operation of the GIL equipment.

[0009] A further improvement of the present invention is that the finger holder includes an annular frame, the inner diameter of which is adapted to the diameter of the finger, so that the actuating contact can be slidably inserted into the cylindrical structure formed by the finger; the outer side of the annular frame is provided with a mounting slot corresponding to the finger, and the inner side of the finger is provided with a connecting slot adapted to the mounting slot; the annular frame and the finger are detachably engaged through the mounting slot and the connecting slot.

[0010] This device restricts the axial and radial displacement of the contact fingers through a slotted structure, ensuring a regular cylindrical structure and smooth, jam-free insertion of the moving contact. At the same time, the detachable design facilitates standardized production, assembly, and maintenance of parts, reducing quality control and production costs.

[0011] A further improvement of the present invention is that support arms are respectively provided on both sides of the bottom of the ring frame, and the two support arms are symmetrically arranged along the central axis of the ring frame; the connecting ball head is placed between the two support arms, and the two sides of the connecting ball head are rotatably connected to the free end of the corresponding support arm through pins.

[0012] This device provides a stable fulcrum for rotation through symmetrically arranged support arms. The connection between the pin and the free end of the support arm reduces rotational resistance, ensuring smooth rotation of the touch finger frame, precise angle adjustment, and avoiding abnormal stress on the support components due to uneven force distribution, thereby improving the structural stability of the device.

[0013] A further improvement of the present invention is that a connecting plane is provided at the center of each side of the connecting ball head, and the center of the connecting plane is rotatably connected to the bottom of the support arm by a pin.

[0014] This device, through its connecting plane, allows for a more stable installation of the pin shaft, ensuring balanced force during rotation, reducing localized wear, preventing jamming or misalignment during rotation, extending the device's lifespan, and guaranteeing the accuracy of angle adjustment.

[0015] A further improvement of the present invention is that the shielding cover is a combined structure, comprising two symmetrically arranged hemispherical covers, which can be enclosed to form a complete shielding cover, and the center of each hemispherical cover is detachably connected to the center of the support arm by bolts.

[0016] This device, through its spherical shielding structure, ensures that the contact assembly system is always within the shielded area. The synchronous rotation design prevents shielding failure during angle adjustments, ensuring that the electric field distribution meets requirements during high-voltage operation. This effectively prevents safety hazards caused by electric field distortion and improves the operational reliability of GIL equipment.

[0017] A further improvement of the present invention is that a contact protrusion is provided on the inner side of the top of the contact finger, the contact protrusion being used to elastically fit against the outer surface of the moving contact.

[0018] This device enhances the contact pressure between the contact finger and the moving contact by using contact protrusions, ensuring a stable contact area, avoiding poor contact due to angle adjustment or vibration, reducing heat loss during conduction, and ensuring smooth transmission of large currents.

[0019] A further improvement of the present invention is that the contact surface of the contact protrusion corresponding to the moving contact is an arc surface B.

[0020] This device avoids bumps and damage when the moving contact is inserted in multiple directions through the design of the arc surface B, reducing assembly difficulty. At the same time, the flexible fit design adapts to the slight displacement of the moving contact, ensuring stable contact and improving assembly efficiency and safety of use.

[0021] A further improvement of the present invention is that the curvature of the arc surface A is greater than that of the arc surface B.

[0022] The large curvature arc surface A ensures that the contact finger and the connecting ball head are always in reliable contact during the angle adjustment process, while the small curvature arc surface B reduces the insertion resistance of the moving contact, thus balancing a large angle adjustment range and contact stability and avoiding contact breakage.

[0023] A further improvement of the present invention is that three contact springs are provided, and the three contact springs are evenly arranged along the length direction of the contact finger; the upper contact spring can apply contact pressure to the top of the contact finger, the lower contact spring can apply contact pressure to the bottom of the contact finger, and the middle contact spring can apply supplementary contact pressure to the middle of the contact finger.

[0024] This device, through the aforementioned layered pressure design, ensures uniform force on each contact point of the touch finger, avoiding poor contact due to insufficient local pressure or component deformation due to excessive pressure, ensuring stable conductivity during high current transmission, and enhancing the device's adaptability to angular deflection.

[0025] A further improvement of the present invention is that a spring slot adapted to the touch finger spring is provided on the outer side of the touch finger, and the touch finger and the touch finger spring are fixedly engaged by the spring slot.

[0026] This device, through its spring slot, ensures that the contact finger spring always provides stable pressure to the corresponding contact point, preventing contact pressure imbalance caused by spring displacement, thus guaranteeing the long-term reliability and stability of the contact device and reducing maintenance frequency.

[0027] A method of using a large-angle self-adjusting contact device suitable for GIL includes the following steps: S1. The contact finger is fixed by a connecting slot and a mounting slot on the ring frame of the contact finger frame, forming a cylindrical structure. Then, the three contact finger springs are inserted into the spring slots on the outside of the contact finger to complete the pre-assembly of the contact assembly frame. S2. The connecting ball head of the stationary contact is placed between the two support arms, and a pin is passed through the center of the connecting plane and rotated to connect with the free end of the support arm, so that the connecting ball head fits into the assembly ball groove; the bottom of the moving contact is slidably inserted into the cylindrical structure and elastically fits the arc surface B of the contact finger; S3. The two hemispherical covers are assembled into a complete shielding cover and fixed to the center of the support arm with bolts to complete the overall assembly; S4. Depending on the GIL installation angle or foundation settlement, the contact finger frame adaptively rotates and adjusts within a 150° range around the pin shaft, and the contact finger spring applies pressure in layers to ensure that the contact finger is in close contact with the moving contact and the connecting ball head. The shielding cover rotates synchronously to ensure the stability of the electric field. S5. During maintenance, remove the fixing bolts of the shield cover, pull out the moving contact, loosen the off-shaft to separate the stationary contact from the contact assembly bracket, and remove the contact finger or contact finger spring as needed before performing maintenance.

[0028] This method first uses step S1 to fix the contact fingers to the mounting slots of the contact finger holder ring frame using connecting slots, forming a regular cylindrical structure. Then, the three contact finger springs are correspondingly inserted into the spring slots, completing the pre-assembly of the contact assembly frame. The standardized slot matching ensures precise contact finger positioning and convenient assembly. Standardized production of parts reduces quality control and assembly costs, while ensuring the regularity of the cylindrical structure, laying the foundation for smooth insertion of the moving contact. In step S2, the connecting ball head of the stationary contact is placed between the two support arms. A pin passes through the connecting plane and rotates to connect with the free end of the support arm, so that the connecting ball head fits into the mounting ball groove. The bottom of the moving contact slides into the cylindrical structure and elastically fits into the arc surface B. The pin rotation connection provides a stable fulcrum for large-angle rotation of the contact finger holder. The fit design of the ball head and ball groove, and the moving contact and arc surface, ensures reliable initial contact and avoids poor contact caused by assembly deviations. Step S3 involves enclosing two hemispherical covers into a complete shield and fixing it to the support arm. The spherical shielding structure completely covers the contact assembly area and rotates synchronously with the contact finger frame, effectively preventing electric field distortion during high-voltage operation, ensuring stable electric field distribution, and improving the operational safety of the GIL equipment. During operation, Step S4 involves adaptively rotating the contact finger frame around the pin shaft within a 150° range, depending on the GIL installation angle or foundation settlement. The contact finger springs are applied in layers—large-angle rotation can accurately compensate for angular deflection caused by uneven foundation settlement, and the layered pressure design ensures that the contact finger, moving contact, and connecting ball head remain in close contact throughout the full-angle adjustment process, reducing heat loss and ensuring stable high-current transmission. During maintenance, Step S5 follows the procedure of "removing the shield → pulling out the contact → loosening the pin shaft to separate the stationary contact from the assembly frame," disassembling the contact finger or contact finger spring as needed for maintenance—the detachable structure design makes the maintenance process simple and efficient, requiring no complex tools, shortening downtime for maintenance, and reducing operation and maintenance costs.

[0029] As can be seen from the above technical solutions, the beneficial effects of the present invention are: 1. This invention enables large-angle adaptive adjustment within a 150° range, effectively overcoming the limitation of existing technologies that only compensate for ±3° deflection. It adapts to the complex terrain installation requirements of GIL systems, flexibly handling various angled layouts, and accurately compensates for the angular displacement of dynamic and static contacts caused by uneven foundation settlement during the equipment's 30-40 year service life. This prevents abnormal stress on support components, fundamentally eliminating potential quality issues and ensuring the long-term safe operation of the GIL system.

[0030] 2. This invention ensures a tight and stable conductive contact during large-angle adjustments by using the arc-shaped fit between the contact finger and the stationary contact ball head, and a layered pressure design for the contact finger spring. This reduces heat loss and the risk of poor contact. Furthermore, the standardized slot design and detachable structure replace traditional customized angle contact designs, reducing parts production, quality control, and maintenance costs. Assembly and disassembly require no complex tools, significantly improving construction efficiency.

[0031] 3. This invention also possesses excellent electric field stability. The hemispherical combined shield rotates synchronously with the contact finger frame, always completely shielding the contact assembly area and preventing electric field distortion during angle adjustments, thus meeting the electrical performance requirements of high-voltage power transmission. It is suitable for scenarios such as high-current, long-distance power transmission and undergrounding of urban power grids. Its simple structure and high reusability balance technological advancement and engineering practicality, providing crucial assurance for the reliable operation of GIL systems. Attached Figure Description

[0032] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a structural schematic diagram of a specific embodiment of the present invention.

[0034] Figure 2 This is a cross-sectional view of a specific embodiment of the present invention.

[0035] Figure 3 This is a schematic diagram of the contact assembly frame according to a specific embodiment of the present invention.

[0036] Figure 4 This is a schematic diagram of the structure of the finger holder according to a specific embodiment of the present invention.

[0037] Figure 5 This is a schematic diagram of the structure of the finger in a specific embodiment of the present invention.

[0038] Figure 6 This is a schematic diagram of the structure of the stationary contact in a specific embodiment of the present invention.

[0039] Figure 7 This is a schematic diagram of the hemispherical cover according to a specific embodiment of the present invention.

[0040] In the diagram: 1. Moving contact; 2. Stationary contact; 3. Connecting ball head; 301. Connecting plane; 4. Shielding cover; 401. Hemispherical cover; 5. Contact assembly frame; 6. Contact finger frame; 601. Ring frame; 602. Mounting slot; 603. Support arm; 7. Contact finger; 701. Arc surface A; 702. Connecting slot; 703. Contact protrusion; 704. Arc surface B; 705. Spring slot; 8. Contact finger spring; 9. Assembly ball groove. Detailed Implementation

[0041] To make the objectives, features, and advantages of this invention more apparent and understandable, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0042] Now refer to Figure 1-7 The following is a description of a large-angle self-adjusting contact device suitable for GILs according to the present invention: The device includes a moving contact 1, a stationary contact 2, and a contact assembly frame 5; the bottom of the moving contact 1 is slidably inserted into the inner top of the contact assembly frame 5, and the top of the stationary contact 2 is rotatably connected to the inner bottom of the contact assembly frame 5; the contact assembly frame 5 includes a finger frame 6, on which several fingers 7 are evenly arranged circumferentially, and the fingers 7 and the finger frame 6 can be enclosed to form a cylindrical structure; after the bottom of the moving contact 1 is slidably inserted into the inner top of the cylindrical structure, the inner side of the top of the moving contact 1 and the finger 7 are in contact; The stationary contact 2 is provided with a connecting ball head 3 at its top. The inner side of the bottom of the contact finger 7 is provided with an arc surface A701 that is adapted to the connecting ball head 3. The arc surface A701 can form an assembly ball groove 9 for installing the connecting ball head 3. The connecting ball head 3 is rotatably connected to the contact finger frame 6 through a pin, and the connecting ball head 3 slides against the inside of the assembly ball groove 9. Several contact finger springs 8 are sleeved at intervals along the length of the outer side of the contact finger 7. The contact finger springs 8 can apply contact pressure between the contact finger 7 and the moving contact 1 / connecting ball head 3. A shielding cover 4 is provided on the outer side of the contact assembly frame 5. The shielding cover 4 can rotate synchronously with the contact assembly frame 5.

[0043] The bottom of the moving contact 1 is slidably inserted into the cylindrical structure enclosed by the contact finger 7, and forms a conductive contact with the inner side of the top of the contact finger 7; the connecting ball head 3 of the stationary contact 2 is rotatably connected to the contact finger frame 6 through a pin, and slides in the assembly ball groove 9 enclosed by the arc surface A701 of the contact finger 7; the contact finger spring 8 applies pressure along the length of the contact finger 7 to ensure that the contact finger 7 is always in close contact with the moving contact 1 and the connecting ball head 3; the shield 4 rotates synchronously with the contact assembly frame 5 and always covers the contact assembly area.

[0044] This device achieves large-angle adaptive adjustment within a 150° range by connecting the ball head 3 and the assembly ball groove 9 and rotating the contact finger frame 6. It effectively compensates for the angle deflection of the moving and stationary contacts caused by uneven foundation settlement. The elastic pressure of the contact finger spring 8 ensures reliable contact during the full-angle adjustment process. The synchronous rotation of the shield 4 ensures a stable electric field distribution and guarantees the long-term safe operation of the GIL equipment.

[0045] Specifically, refer to Figure 4 and 5 The finger holder 6 includes an annular frame 601, the inner diameter of which is adapted to the diameter of the finger 7 so that the actuating contact 1 can be slidably inserted into the cylindrical structure formed by the finger 7. The outer side of the annular frame 601 is provided with a mounting slot 602 corresponding to the finger 7, and the inner side of the finger 7 is provided with a connecting slot 702 adapted to the mounting slot 602. The annular frame 601 and the finger 7 are detachably engaged through the mounting slot 602 and the connecting slot 702.

[0046] The ring-shaped frame 601 of the contact finger holder 6 is detachably engaged with the connecting slot 702 on the inner side of the contact finger 7 through the mounting slot 602 on the outer side, so that the contact finger 7 is evenly distributed around the ring-shaped frame 601 and forms a regular cylindrical structure. The inner diameter of the ring-shaped frame 601 is adapted to the diameter of the contact finger 7, providing guidance for the sliding insertion of the moving contact 1.

[0047] This device restricts the axial and radial displacement of the contact finger 7 through a slotted structure, ensuring a regular cylindrical structure and smooth, unobstructed insertion of the moving contact 1. At the same time, the detachable design facilitates standardized production, assembly, and maintenance of parts, reducing quality control and production costs.

[0048] Specifically, refer to Figure 2 and 4 The bottom of the ring frame 601 is provided with support arms 603 on both sides, and the two support arms 603 are symmetrically arranged along the central axis of the ring frame 601; the connecting ball head 3 is placed between the two support arms 603, and the two sides of the connecting ball head 3 are rotatably connected to the free end of the corresponding support arm 603 through pins.

[0049] Two support arms 603 at the bottom of the ring frame 601 are symmetrically arranged along the central axis. The connecting ball head 3 is placed between the two support arms 603 and is rotatably connected to the free end of the support arm 603 through a pin, so that the finger frame 6 can rotate flexibly around the central axis of the connecting ball head 3.

[0050] This device provides a stable fulcrum for rotation through symmetrically arranged support arms 603. The connection between the pin and the free end of the support arm reduces rotational resistance, ensuring smooth rotation of the finger frame 6 and precise angle adjustment. It also avoids abnormal stress on the support components due to uneven force distribution, thereby improving the structural stability of the device.

[0051] Specifically, refer to Figure 2 and 5 The inner side of the top of the contact finger 7 is provided with a contact protrusion 703, which is used to elastically fit with the outer surface of the moving contact 1.

[0052] The contact protrusion 703 on the inner side of the top of the contact finger 7 elastically fits against the outer surface of the moving contact 1 under the action of the contact finger spring 8, and the contact pressure is focused through the protrusion structure.

[0053] This device enhances the contact pressure between the contact finger 7 and the moving contact 1 through the contact protrusion 703, ensuring a stable contact area, avoiding poor contact due to angle adjustment or vibration, reducing heat loss during the conduction process, and ensuring smooth transmission of large current.

[0054] Specifically, refer to Figure 5 The contact surface of the contact protrusion 703 corresponding to the moving contact 1 is an arc surface B704.

[0055] The arc surface B704 of the contact protrusion 703 is adapted to the outer surface of the moving contact 1. When the moving contact 1 is slidably inserted, the arc surface B704 reduces the contact resistance and achieves flexible fit.

[0056] This device avoids bumps and damage when the moving contact 1 is inserted in multiple directions through the design of the arc surface B704, reducing assembly difficulty. At the same time, the flexible fit design adapts to the slight displacement of the moving contact 1, ensuring stable contact state and improving assembly efficiency and safety of use.

[0057] Specifically, refer to Figure 5 The curvature of the arc surface A701 is greater than that of the arc surface B704.

[0058] The curvature of the bottom arc surface A701 of the contact finger 7 is greater than that of the top arc surface B704. The arc surface A701 is completely in contact with the outer surface of the connecting ball head 3, and the arc surface B704 is in flexible contact with the moving contact 1 to adapt to the contact requirements of different components.

[0059] The large curvature arc surface A701 ensures that the contact finger 7 and the connecting ball head 3 are always in reliable contact during the angle adjustment process, while the small curvature arc surface B704 reduces the insertion resistance of the moving contact 1, balancing a large angle adjustment range and contact stability, and avoiding contact breakage.

[0060] Specifically, refer to Figure 2 , 3 5. The outer side of the finger 7 is provided with a spring slot 705 that is adapted to the finger spring 8, and the finger 7 and the finger spring 8 are fixed together by the spring slot 705.

[0061] The spring slot 705 on the outer side of the finger 7 is adapted to the finger spring 8. The finger spring 8 is fixed in a preset position by the snap-fit ​​structure to prevent the spring from shifting along the length of the finger 7.

[0062] This device, through the spring slot 705, ensures that the contact finger spring 8 always provides stable pressure to the corresponding contact point, avoids contact pressure imbalance caused by spring displacement, ensures the long-term reliability and stability of the contact device, and reduces maintenance frequency.

[0063] In one embodiment, reference Figure 6 A connecting plane 301 is provided at the center of each side of the connecting ball head 3, and the center of the connecting plane 301 is rotatably connected to the bottom of the support arm 603 by a pin.

[0064] The connecting plane 301 at the center of both sides of the ball head 3 provides a flat mounting surface for the pin. The pin passes through the connecting plane 301 and is rotatably connected to the bottom of the support arm 603, so that the rotational force is evenly transmitted along the connecting plane.

[0065] This device, through the connecting plane 301, enables the pin shaft to be installed more securely, ensuring balanced force during rotation, reducing localized wear, preventing jamming or misalignment during rotation, extending the device's service life, and guaranteeing the accuracy of angle adjustment.

[0066] In one embodiment, reference Figure 7 The shield 4 is a combined structure, including two symmetrically arranged hemispherical covers 401. The two hemispherical covers 401 can be enclosed to form a complete shield 4, and the center of each hemispherical cover 401 is detachably connected to the center of the support arm 603 by bolts.

[0067] The shielding cover 4 is formed by two symmetrical hemispherical covers 401 enclosing a complete spherical structure. It is detachably connected to the center of the support arm 603 by bolts and rotates synchronously with the support arm 603, always shielding the contact assembly frame 5 as a whole.

[0068] This device, through its spherical shielding structure, ensures that the contact assembly system is always within the shielded area. The synchronous rotation design prevents shielding failure during angle adjustments, ensuring that the electric field distribution meets requirements during high-voltage operation. This effectively prevents safety hazards caused by electric field distortion and improves the operational reliability of GIL equipment.

[0069] In one embodiment, reference Figure 2 and 3 The three contact springs 8 are evenly arranged along the length of the contact finger 7. The upper contact spring 8 can apply contact pressure to the top of the contact finger 7, the lower contact spring 8 can apply contact pressure to the bottom of the contact finger 7, and the middle contact spring 8 can apply supplementary contact pressure to the middle of the contact finger 7.

[0070] Three contact springs 8 are evenly distributed along the length of the contact finger 7. The upper spring applies pressure to the top of the contact finger 7 to fit the moving contact 1, the lower spring applies pressure to the bottom of the contact finger 7 to fit the connecting ball head 3, and the middle spring supplements the overall contact pressure.

[0071] This device, through the aforementioned layered pressure design, ensures uniform force distribution at each contact point of the contact finger 7, avoiding poor contact due to insufficient local pressure or component deformation due to excessive pressure, ensuring stable conductivity during high current transmission, and enhancing the device's adaptability to angular deflection.

[0072] A method of using a large-angle self-adjusting contact device suitable for GIL includes the following steps: S1. The contact finger 7 is fixed by the mounting slot 602 on the ring frame 601 of the contact finger frame 6 through the connecting slot 702, forming a cylindrical structure. Then, the three contact finger springs 8 are correspondingly inserted into the spring slots 705 on the outside of the contact finger 7 to complete the pre-installation of the contact assembly frame 5. S2. The connecting ball head 3 of the stationary contact 2 is placed between the two support arms 603, and is rotatably connected to the free end of the support arm 603 by a pin passing through the center of the connecting plane 301, so that the connecting ball head 3 fits into the ball groove 9; the bottom of the moving contact 1 is slidably inserted into the cylindrical structure and elastically fits into the arc surface B704 of the contact finger 7. S3. The two hemispherical covers 401 are assembled into a complete shielding cover 4, and fixed to the center of the support arm 603 by bolts to complete the overall assembly; S4. Depending on the GIL installation angle or foundation settlement, the finger frame 6 adaptively rotates and adjusts within a 150° range around the pin shaft, and the finger spring 8 applies pressure in layers to ensure that the finger 7 is in close contact with the moving contact 1 and the connecting ball head 3. The shielding cover 4 rotates synchronously to ensure the stability of the electric field. S5. During maintenance, remove the fixing bolts of the shielding cover 4, pull out the moving contact 1, loosen the off-shaft to separate the stationary contact 2 from the contact assembly frame 5, and remove the contact finger 7 or contact finger spring 8 as needed before maintenance.

[0073] This method first uses step S1 to fix the contact finger 7 to the mounting slot 602 of the ring frame 601 of the contact finger frame 6 via the connecting slot 702, forming a regular cylindrical structure. Then, the three contact finger springs 8 are correspondingly inserted into the spring slots 705 to complete the pre-assembly of the contact assembly frame 5. The standardized slot matching makes the contact finger 7 accurately positioned and easy to assemble. The parts can be produced in a standardized manner, reducing quality control and assembly costs. At the same time, it ensures the regularity of the cylindrical structure, laying the foundation for the smooth insertion of the moving contact 1. In step S2, the connecting ball head 3 of the stationary contact 2 is placed between the two support arms 603. A pin passes through the connecting plane 301 and rotates to connect with the free end of the support arm 603, allowing the connecting ball head 3 to fit snugly against the assembly ball groove 9. The bottom of the moving contact 1 slides into the cylindrical structure and elastically fits against the arc surface B704. The pin-rotation connection provides a stable fulcrum for the large-angle rotation of the contact finger holder 6. The fit design between the ball head and the ball groove, and between the moving contact and the arc surface, ensures reliable initial contact and avoids poor contact caused by assembly deviations. In step S3, the two hemispherical covers 401 are enclosed to form a complete shield 4 and fixed to the support arm 603. The spherical shield structure can completely cover the contact assembly area and can rotate synchronously with the contact finger holder 6, effectively preventing electric field distortion during high-voltage operation, ensuring stable electric field distribution, and improving the operational safety of the GIL equipment. During operation, step S4 involves adaptively rotating the contact finger holder 6 around the pin shaft within a 150° range, based on the GIL installation angle or foundation settlement. The contact finger spring 8 applies layered pressure—large-angle rotation precisely compensates for angular deflection caused by uneven foundation settlement, and the layered pressure design ensures that the contact finger 7 remains in close contact with the moving contact 1 and connecting ball head 3 throughout the full-angle adjustment process, reducing heat loss and ensuring stable high-current transmission. During maintenance, step S5 follows the procedure of "removing the shielding cover → pulling the contact → loosening the pin shaft to separate the stationary contact from the mounting bracket," disassembling the contact finger 7 or contact finger spring 8 as needed—the detachable structure design simplifies and simplifies the maintenance process, eliminating the need for complex tools, shortening downtime, and reducing maintenance costs.

[0074] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A large-angle self-adjusting contact device suitable for GIL, comprising a moving contact (1), a stationary contact (2), and a contact assembly frame (5), characterized in that, The bottom of the moving contact (1) is slidably inserted into the inner top of the contact assembly frame (5), and the top of the stationary contact (2) is rotatably connected to the inner bottom of the contact assembly frame (5); the contact assembly frame (5) includes a finger frame (6), and several fingers (7) are evenly arranged along its circumference on the finger frame (6), and the several fingers (7) and the finger frame (6) can be enclosed to form a cylindrical structure; after the bottom of the moving contact (1) is slidably inserted into the inner top of the cylindrical structure, the moving contact (1) and the inner side of the top of the finger (7) are in contact; the top of the stationary contact (2) is provided with a connecting ball head (3), and the inner side of the bottom of the finger (7) is provided with a connecting ball head (3). The head (3) is fitted with an arc surface A (701), which can form an assembly ball groove (9) for installing the connecting ball head (3). The connecting ball head (3) is rotatably connected to the finger frame (6) by a pin, and the connecting ball head (3) slides against the inside of the assembly ball groove (9). Several finger springs (8) are sleeved on the outside of the finger (7) along its length direction. The finger springs (8) can apply contact pressure between the finger (7) and the moving contact (1) / connecting ball head (3). A shield (4) is provided on the outside of the contact assembly frame (5). The shield (4) can rotate synchronously with the contact assembly frame (5).

2. The large-angle self-adjusting contact device suitable for GIL according to claim 1, characterized in that, The finger holder (6) includes an annular frame (601), the inner diameter of which is adapted to the diameter of the finger (7) so that the actuating contact (1) can be slidably inserted into the cylindrical structure formed by the finger (7); the outer side of the annular frame (601) is provided with a mounting slot (602) corresponding to the finger (7), and the inner side of the finger (7) is provided with a connecting slot (702) adapted to the mounting slot (602). The annular frame (601) and the finger (7) are detachably connected by the mounting slot (602) and the connecting slot (702).

3. The large-angle self-adjusting contact device suitable for GIL according to claim 2, characterized in that, Support arms (603) are provided on both sides of the bottom of the ring frame (601), and the two support arms (603) are symmetrically arranged along the central axis of the ring frame (601); the connecting ball head (3) is placed between the two support arms (603), and the two sides of the connecting ball head (3) are rotatably connected to the free end of the corresponding support arm (603) through pins.

4. The large-angle self-adjusting contact device suitable for GIL according to claim 3, characterized in that, A connecting plane (301) is provided at the center of each side of the connecting ball head (3), and the center of the connecting plane (301) is rotatably connected to the bottom of the support arm (603) by a pin.

5. The large-angle self-adjusting contact device suitable for GIL according to claim 3, characterized in that, The shield (4) is a combined structure, including two symmetrically arranged hemispherical covers (401). The two hemispherical covers (401) can be enclosed to form a complete shield (4), and the center of each hemispherical cover (401) is detachably connected to the center of the support arm (603) by bolts.

6. The large-angle self-adjusting contact device suitable for GIL according to claim 1, characterized in that, The inner side of the top of the finger (7) is provided with a contact protrusion (703), which is used to elastically fit with the outer surface of the moving contact (1).

7. The large-angle self-adjusting contact device suitable for GIL according to claim 6, characterized in that, The contact surface of the contact protrusion (703) corresponding to the moving contact (1) is an arc surface B (704); the arc curvature of the arc surface A (701) is greater than the arc curvature of the arc surface B (704).

8. The large-angle self-adjusting contact device suitable for GIL according to claim 1, characterized in that, There are three finger springs (8), and the three finger springs (8) are evenly arranged along the length direction of the finger (7); the upper finger spring (8) can apply contact pressure to the top of the finger (7), the lower finger spring (8) can apply contact pressure to the bottom of the finger (7), and the middle finger spring (8) can apply supplementary contact pressure to the middle of the finger (7).

9. A large-angle self-adjusting contact device suitable for GIL according to claim 8, characterized in that, The outer side of the finger (7) is provided with a spring slot (705) that is compatible with the finger spring (8), and the finger (7) and the finger spring (8) are fixed together by the spring slot (705).

10. A method of using a large-angle self-adjusting contact device suitable for GIL according to any one of claims 4-9, characterized in that, Includes the following steps: S1. The contact finger (7) is fixed by the mounting slot (602) on the ring frame (601) of the contact finger frame (6) through the connecting slot (702) to form a cylindrical structure. Then, the three contact finger springs (8) are inserted into the spring slots (705) on the outside of the contact finger (7) to complete the pre-installation of the contact assembly frame (5). S2. Place the connecting ball head (3) of the stationary contact (2) between the two support arms (603), and rotatably connect it to the free end of the support arm (603) through the center of the connecting plane (301) by a pin, so that the connecting ball head (3) fits into the assembly ball groove (9); the bottom of the moving contact (1) is slidably inserted into the cylindrical structure and elastically fits into the arc surface B (704) of the contact finger (7); S3. The two hemispherical covers (401) are assembled into a complete shield (4), and fixed to the center of the support arm (603) by bolts to complete the overall assembly; S4. Depending on the installation angle of the GIL or the foundation settlement, the finger frame (6) is adaptively rotated and adjusted within a range of 150° around the pin shaft, and the finger spring (8) is applied in layers to ensure that the finger (7) is in close contact with the moving contact (1) and the connecting ball head (3), and the shield (4) rotates synchronously to ensure the stability of the electric field. S5. During maintenance, remove the fixing bolts of the shield cover (4), pull out the moving contact (1), loosen the off-shaft to separate the stationary contact (2) from the contact assembly frame (5), and remove the contact finger (7) or contact finger spring (8) as needed before maintenance.

Images