Anti-loosening device for high-voltage bushing end screen
By designing an elastic pre-tightening system and a limiting guide structure at the high-voltage bushing end screen joint, the loosening problem caused by vibration was solved, and stable grounding of the high-voltage bushing end screen was achieved, ensuring the safety and reliability of power equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI XINYING POWERTECH
- Filing Date
- 2025-05-30
- Publication Date
- 2026-05-26
AI Technical Summary
The end screen joint of the high-voltage bushing is prone to loosening under vibration, resulting in poor grounding. Existing technology cannot adaptively adjust, making it difficult to detect and prevent loosening in a timely manner.
An anti-loosening device was designed, comprising an outer shell, a conductive rod, an anti-loosening unit, and a top cover. The device utilizes an anti-loosening spring and a limiting sleeve to form an elastic pre-tightening system, which dynamically adapts to vibration, automatically fills the loosening gap, and limits the excessive displacement of the conductive rod. The axial sliding guidance is achieved through the cooperation of the limiting sleeve and the positioning sleeve, thus preventing the high-voltage electric field from acting directly on the metal parts.
It effectively prevents the loosening of the high-voltage bushing end screen joint, improves the long-term reliability of grounding, ensures the safe and stable operation of power equipment, and avoids power accidents caused by loosening.
Smart Images
Figure CN224287965U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of anti-loosening devices for the end screen of high-voltage bushings, and in particular to an anti-loosening device for the end screen of high-voltage bushings. Background Technology
[0002] In power systems, high-voltage bushings, as critical equipment, play a vital role in guiding high-voltage current into and out of transformers, switchgear, and other electrical equipment. The stability of their operation directly affects the safe and reliable operation of the entire power system. Reliable grounding of the high-voltage bushing's end-screen connector is a crucial link in ensuring normal equipment operation and personnel safety. End-screen grounding effectively releases accumulated static charge on the bushing, preventing serious faults such as partial discharge and insulation breakdown caused by static electricity accumulation, thereby preventing equipment damage or even power accidents. This is of great significance for the stable power supply of the power system. In past practices of power equipment operation monitoring and maintenance, to achieve real-time monitoring of the high-voltage bushing's operating status, it is often necessary to install online bushing monitoring devices. The installation process of this device involves additional electrical connection operations at the end-screen connector. Specifically, on-site personnel use wires with plug-in connectors, plug them into the end-screen connector, and then extend and reliably ground the wires to establish an electrical path between the online monitoring device and the end screen. This allows for the collection of relevant electrical parameters of the end screen, such as dielectric loss factor and capacitance value, thereby enabling real-time assessment of the bushing's insulation status.
[0003] However, this traditional connection method has revealed a serious problem that urgently needs to be addressed during actual operation. High-voltage bushings inevitably vibrate due to various factors during operation. These vibrations may originate from the operation of the power equipment itself, such as the magnetostrictive vibration of the transformer core or the vibration of the cooling system's fans; they may also come from the external environment, such as the vibration of nearby equipment or the transmission of mechanical vibrations from transportation. Under continuous vibration, the connection points that were originally tightly connected by the bushings will gradually loosen. As operating time progresses, the loosening between the bushing and the end-screen connector will intensify. This loosening is not obvious; its occurrence is relatively hidden and difficult to detect in a timely manner through routine visual inspection by relevant personnel. Once the connection becomes loose, it will lead to poor grounding of the end screen, resulting in a series of serious consequences.
[0004] Utility model patent CN211086402U discloses an anti-loosening assembly structure for a high-voltage bushing end screen adapter, including a bushing body and an end screen adapter. The end screen adapter is screwed onto the bushing body by rotation. A flange is connected to the outer shell of the end screen adapter, and an anti-loosening support is detachably connected to the flange. The support direction of the anti-loosening support is perpendicular to the central axis of the end screen adapter, and the base portion of the anti-loosening support abuts against or is fixedly connected to the base portion of the bushing body. Although this utility patent achieves anti-loosening, it cannot adaptively fix the end screen according to the vibration amplitude.
[0005] Therefore, providing an anti-loosening device that can adaptively adjust according to the vibration amplitude is an urgent problem to be solved. Utility Model Content
[0006] The purpose of this invention is to overcome the defects of the prior art and provide an anti-loosening device for the end screen of high-voltage bushings.
[0007] The objective of this utility model can be achieved through the following technical solutions:
[0008] According to one aspect of the present invention, an anti-loosening device for a high-voltage bushing end screen is provided, comprising an outer casing, a bushing end screen unit, a conductive rod, an anti-loosening unit, and a top cover. The bushing end screen unit, the conductive rod, and the anti-loosening unit are all installed in the outer casing. The bushing end screen unit is connected to the anti-loosening unit through the conductive rod. The top cover is installed on the outer casing, and the anti-loosening unit is installed on a fixed cover.
[0009] As a preferred technical solution, the anti-loosening unit includes a limiting ring, a fastening bolt, and an anti-loosening spring. The fastening bolt is installed on the top cover and is connected to the conductive rod. The limiting ring and the anti-loosening spring are both installed on the conductive rod, and the limiting ring is connected to the top cover through the anti-loosening spring.
[0010] As a preferred technical solution, the bushing end screen unit includes a transformer body, a bushing end screen connector, and a sleeve. The bushing end screen connector is installed on the transformer body, and the sleeve is connected to the bushing end screen connector and the conductive rod respectively.
[0011] As a preferred technical solution, the conductive rod, fastening bolt, sleeve end screen connector and plug sleeve are coaxial.
[0012] As a preferred technical solution, the bushing end screen unit further includes a guide sleeve, which is installed on the transformer body, and the bushing end screen joint is installed on the guide sleeve.
[0013] As a preferred technical solution, the sleeve end screen unit further includes a circular hole, and the guide sleeve is installed in the circular hole.
[0014] As a preferred technical solution, the device further includes a bushing end screen chamber base, which is installed in the outer casing and connected to the transformer body.
[0015] As a preferred technical solution, the device further includes a limiting sleeve, which is installed in the outer casing and connected to the base of the end screen chamber of the sleeve.
[0016] As a preferred technical solution, the device further includes a support sleeve and a positioning sleeve, wherein the support sleeve is installed in the outer casing and the positioning sleeve is installed in the support sleeve.
[0017] As a preferred technical solution, the conductive rod passes through the limiting sleeve and the positioning sleeve.
[0018] Compared with the prior art, the present invention has the following beneficial effects:
[0019] 1. This utility model forms an elastic pre-tightening system between the outer sleeve end screen unit, the conductive rod, and the anti-loosening unit. The vibration of the sleeve end screen unit is transmitted through the conductive rod, and the anti-loosening unit can dynamically adapt to the displacement changes of the conductive rod, so that the three can always maintain good contact.
[0020] 2. This utility model is equipped with an anti-loosening spring. When the top cover is connected to the outer shell, the anti-loosening spring will generate an initial preload. When vibration occurs, the anti-loosening spring will automatically fill the loose gap and limit the excessive displacement of the conductive rod. It allows for slight elastic compensation. The elastic characteristics of the anti-loosening spring enable it to respond in real time to the displacement changes caused by vibration.
[0021] 3. This utility model is provided with a limiting sleeve and a positioning sleeve. Through the cooperation between the limiting sleeve and the positioning sleeve, the conductive rod can only move along the axial direction for sliding guidance.
[0022] 4. This utility model is equipped with a support sleeve made of insulating material. The support sleeve completely isolates the conductive rod from the outer casing and the transformer body, preventing the high-voltage electric field from acting directly on the metal parts and preventing surface discharge or corona discharge. Attached Figure Description
[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0024] Figure 2 This is a cross-sectional three-dimensional structural diagram of the present invention;
[0025] Figure 3 This is a three-dimensional cross-sectional view of the top of this utility model;
[0026] Figure 4 This is a three-dimensional structural diagram of the top cross-section of this utility model;
[0027] 1. Outer casing; 2. Top cover; 3. Bushing end screen chamber base; 4. Conductive rod; 5. Limiting sleeve; 6. Limiting ring; 7. Fastening bolt; 8. Anti-loosening spring; 9. Insert sleeve; 10. Support sleeve; 11. Transformer body; 12. Bushing end screen connector; 13. Guide sleeve; 14. Circular hole; 15. Fixing bolt; 16. Positioning sleeve. Detailed Implementation
[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present utility model.
[0029] This invention addresses the common problem of loosening of the connector between the sleeve and the end screen, which prevents the dynamic maintenance of a secure connection. This invention provides an anti-loosening device for the end screen of a high-voltage bushing. The device forms an elastic pre-tightening system between the outer sleeve end screen unit, the conductive rod, and the anti-loosening unit. The conductive rod transmits vibrations of the end screen unit, and the anti-loosening unit dynamically adapts to changes in the conductive rod's displacement, ensuring consistent and reliable contact among the three components. The invention incorporates an anti-loosening spring. When the top cover connects to the outer sleeve, the anti-loosening spring generates an initial pre-tightening force. During vibration, the anti-loosening spring automatically fills any loosening gaps and limits excessive displacement of the conductive rod, allowing for minor elastic compensation. The elastic characteristics of the anti-loosening spring enable it to respond in real-time to displacement changes caused by vibration. The invention also includes a limiting sleeve and a positioning sleeve. The cooperation between the limiting sleeve and the positioning sleeve ensures that the conductive rod can only move axially, providing sliding guidance. This utility model is equipped with a support sleeve made of insulating material. The support sleeve completely isolates the conductive rod from the outer casing and the transformer body, preventing the high-voltage electric field from acting directly on the metal parts and preventing surface discharge or corona discharge.
[0030] Example 1
[0031] like Figures 1-4 As shown, an anti-loosening device for a high-voltage bushing end screen includes an outer casing 1, a bushing end screen unit, a conductive rod 4, an anti-loosening unit, and a top cover 2. The bushing end screen unit, the conductive rod 4, and the anti-loosening unit are all installed in the outer casing 1. The bushing end screen unit is connected to the anti-loosening unit through the conductive rod 4. The top cover 2 is installed on the outer casing 1, and the anti-loosening unit is installed on the fixed cover 2.
[0032] The anti-loosening unit includes a limiting ring 6, a fastening bolt 7, and an anti-loosening spring 8. The fastening bolt 7 is installed on the top cover 2 and is connected to the conductive rod 4. The limiting ring 6 and the anti-loosening spring 8 are both installed on the conductive rod 4. The limiting ring 6 is connected to the top cover 2 through the anti-loosening spring 8.
[0033] The bushing end screen unit includes a transformer body 11, a bushing end screen connector 12, and a sleeve 9. The bushing end screen connector 12 is installed on the transformer body 11, and the sleeve 9 is connected to the bushing end screen connector 12 and the conductive rod 4 respectively.
[0034] The bushing end screen unit also includes a guide sleeve 13, which is installed on the transformer body 11, and the bushing end screen joint 12 is installed on the guide sleeve 13.
[0035] The sleeve end screen unit also includes a circular hole 14, and the guide sleeve 13 is installed in the circular hole 14.
[0036] The device also includes a bushing end screen chamber base 3, which is installed in the outer casing 1 and is connected to the transformer body 11.
[0037] The device also includes a limiting sleeve 5, which is installed in the outer casing 1 and is connected to the base 3 of the end screen chamber of the sleeve.
[0038] The device further includes a support sleeve 10 and a positioning sleeve 16, wherein the support sleeve 10 is installed in the outer casing 1 and the positioning sleeve 16 is installed in the support sleeve 10.
[0039] In this embodiment, the overall connection relationship of the device of this utility model is as follows: the top of the outer casing 1 is in movable contact with the top cover 2; the inner wall of the outer casing 1 is fixedly connected to the end screen chamber base 3 of the sleeve; the end screen chamber base 3 of the sleeve is provided with a conductive rod 4; the end screen chamber base 3 of the sleeve is sleeved on the conductive rod 4; the inner wall of the outer casing 1 is fixedly connected to the limiting sleeve 5; the limiting sleeve 5 is slidably connected to the conductive rod 4; the conductive rod 4 is fixedly connected to the limiting ring 6; and the top of the limiting ring 6 is fixedly connected to the bottom of the inspection top cover 2 with an anti-loosening mechanism. Spring 8, anti-loosening spring 8 is sleeved on conductive rod 4. The top of conductive rod 4 is provided with fastening bolt 7, the top of fastening bolt 7 extends to the top of top cover 2. The bottom of conductive rod 4 is provided with insert sleeve 9. Support sleeve 10 is fixedly connected to the base 3 of bushing end screen chamber. Support sleeve 10 is sleeved on conductive rod 4. Transformer body 11 is provided at the bottom of outer casing 1. Bushing end screen connector 12 is inserted into insert sleeve 9. Guide sleeve 13 is sleeved on bushing end screen connector 12. Guide sleeve 13 is fixedly connected to transformer body 11.
[0040] A circular hole 14 is provided on the transformer body 11, and the transformer body 11 is fixedly connected to the guide sleeve 13 through the circular hole 14.
[0041] The maintenance cover 2 is threadedly connected to the outer casing 1 by multiple fixing bolts 15. The fixing bolts 15 facilitate quick disassembly of the maintenance cover 2.
[0042] The limiting sleeve 5 is provided with a positioning sleeve 16, which is slidably connected to the conductive rod 4.
[0043] The support sleeve 10 is made of insulating material. The support sleeve 10 completely isolates the conductive rod 4 from the metal outer casing 1 and the transformer body 11, preventing the high voltage electric field from acting directly on the metal parts and preventing surface discharge or corona discharge.
[0044] The top of the sleeve end screen chamber base 3 is provided with a circular groove. The sleeve end screen chamber base 3 is connected to the support sleeve 10 through the circular groove. The axisymmetric structure of the circular groove is strictly matched with the outer diameter of the support sleeve 10. Precise positioning is achieved through interference fit or clearance fit.
[0045] The conductive rod 4, fastening bolt 7, sleeve end cap connector 12, and insert 9 are coaxial. The conductive rod 4 passes through the limiting sleeve 5 and the positioning sleeve 16.
[0046] In this embodiment, the conductive rod 4, fastening bolt 7, sleeve end screen connector 12, and plug sleeve 9 are all located at the center of the device. The coaxiality facilitates the axial movement of the conductive rod and can more intuitively reflect the location of the conductive rod.
[0047] The working principle of this utility model is as follows: The device forms an elastic pre-tightening system by setting a fastening bolt 7 at the top of the conductive rod 4 and installing an anti-loosening spring 8 between it and the top cover 2. When the top cover 2 is threadedly connected to the outer casing sleeve 1 by the fixing bolt 15, the anti-loosening spring 8 is compressed to generate an initial pre-tightening force. When the equipment vibrates during operation, a small loose gap may appear at the connection between the bushing end screen joint 12 and the insert 9. At this time, the elastic potential energy of the anti-loosening spring 8 is released, pushing the conductive rod 4 to move downward along the axial direction. Through the sliding guidance of the limiting sleeve 5 and the positioning sleeve 16, the loose gap is automatically filled. The limiting ring 6 is fixed in the middle of the conductive rod 4, and the anti-loosening spring 8 between its top and the bottom of the maintenance top cover 2 forms an axial elastic constraint, limiting the excessive displacement of the conductive rod 4, while allowing small elastic compensation. The elastic characteristics of the anti-loosening spring 8 enable it to respond in real time to the displacement changes caused by vibration, solving the problem of loosening and falling off of the traditional end screen lead-out rod due to vibration, significantly improving the long-term reliability of the high-voltage bushing end screen grounding, and providing key technical guarantees for the safe and stable operation of power equipment.
[0048] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.
Claims
1. An anti-loosening device for the end screen of a high-voltage bushing, characterized in that, It includes an outer casing (1), a sleeve end screen unit, a conductive rod (4), an anti-loosening unit, and a top cover (2). The sleeve end screen unit, the conductive rod (4), and the anti-loosening unit are all installed in the outer casing (1). The sleeve end screen unit is connected to the anti-loosening unit through the conductive rod (4). The top cover (2) is installed on the outer casing (1), and the anti-loosening unit is installed on the top cover (2).
2. The anti-loosening device for the end screen of a high-voltage bushing according to claim 1, characterized in that, The anti-loosening unit includes a limiting ring (6), a fastening bolt (7), and an anti-loosening spring (8). The fastening bolt (7) is installed on the top cover (2) and is connected to the conductive rod (4). The limiting ring (6) and the anti-loosening spring (8) are both installed on the conductive rod (4). The limiting ring (6) is connected to the top cover (2) through the anti-loosening spring (8).
3. The anti-loosening device for the end screen of a high-voltage bushing according to claim 2, characterized in that, The bushing end screen unit includes a transformer body (11), a bushing end screen connector (12), and a sleeve (9). The bushing end screen connector (12) is installed on the transformer body (11), and the sleeve (9) is connected to the bushing end screen connector (12) and the conductive rod (4) respectively.
4. The anti-loosening device for the end screen of a high-voltage bushing according to claim 3, characterized in that, The conductive rod (4), fastening bolt (7), sleeve end screen connector (12) and plug sleeve (9) are coaxial.
5. The anti-loosening device for the end screen of a high-voltage bushing according to claim 3, characterized in that, The bushing end screen unit also includes a guide sleeve (13), which is installed on the transformer body (11), and the bushing end screen connector (12) is installed on the guide sleeve (13).
6. The anti-loosening device for the end screen of a high-voltage bushing according to claim 5, characterized in that, The sleeve end screen unit also includes a circular hole (14), and the guide sleeve (13) is installed in the circular hole (14).
7. The anti-loosening device for the end screen of a high-voltage bushing according to claim 3, characterized in that, The device also includes a bushing end screen chamber base (3), which is installed in the outer casing (1) and is connected to the transformer body (11).
8. The anti-loosening device for the end screen of a high-voltage bushing according to claim 7, characterized in that, The device also includes a limiting sleeve (5), which is installed in the outer casing (1) and is connected to the end screen chamber base (3) of the sleeve.
9. The anti-loosening device for the end screen of a high-voltage bushing according to claim 8, characterized in that, The device further includes a support sleeve (10) and a positioning sleeve (16), wherein the support sleeve (10) is installed in the outer casing (1) and the positioning sleeve (16) is installed in the support sleeve (10).
10. The anti-loosening device for the end screen of a high-voltage bushing according to claim 9, characterized in that, The conductive rod (4) passes through the limiting sleeve (5) and the positioning sleeve (16).