A kind of opening and closing indicator for GIS circuit breaker crank arm box

Abstract

The utility model discloses a kind of for GIS circuit breaker crank arm box's opening and closing indicator, including opening and closing indicator unit and closing plate, opening and closing indicator unit includes the opening hole being set on three-phase fixed support frame, the support assembly for supporting the rotation of crank arm shaft of outer crank arm in opening hole, the opening and closing indicator connecting block being connected with the end of crank arm shaft and the opening and closing indicator panel that can rotate synchronously with crank arm shaft and be fixed on opening and closing indicator connecting block, closing plate is installed on three-phase fixed support frame and covers opening and closing indicator unit, closing plate has observation window, opening and closing indicator panel is marked with closing and opening, when outer crank arm rotates to opening position, crank arm shaft synchronously drives opening and closing indicator panel to rotate to opening mark to show in observation window, when outer crank arm rotates to closing position, crank arm shaft synchronously drives opening and closing indicator panel to rotate to closing mark to show in observation window. The utility model opening and closing state feedback is synchronous with equipment action, effect is intuitive and accurate.

Description

Technical Field

[0001] This utility model relates to an opening and closing indicator for a GIS circuit breaker crank arm box. Background Technology

[0002] Currently, high-voltage power systems commonly use SF6 circuit breakers (GCBs) or gas-insulated metal-enclosed switchgear (GIS) as core control and protection devices. As a core component of GIS, the reliability of the circuit breaker's operating mechanism directly affects the overall performance of the equipment. Therefore, existing opening and closing indicators are mostly integrated into the operating mechanism itself, indirectly calculating the circuit breaker's opening and closing status through the linkage transmission of the crank arm output by the monitoring mechanism.

[0003] However, existing opening and closing indicators have the following drawbacks:

[0004] (1) A long mechanical transmission chain (connecting rods, pins, etc.) will accumulate errors, causing the indication to deviate from the actual state of the body.

[0005] (2) If the transmission components break or fail, the mechanism end indicator will completely lose feedback on the true status of the circuit breaker body, which may lead to misjudgment or even a major accident. Utility Model Content

[0006] The purpose of this utility model is to provide a simple, low-cost, and accurate indicator for the opening and closing status of a GIS circuit breaker crank arm box.

[0007] The purpose of this utility model is achieved through the following technical measures: a closing / opening indicator for a GIS circuit breaker crank arm box, characterized in that it includes a closing / opening indicator unit and a cover plate. The closing / opening indicator unit includes an opening provided on a three-phase fixed support frame, a support assembly provided in the opening for supporting the rotation of the crank arm shaft of the outer crank arm of the crank arm box, a closing / opening indicator connecting block connected to the end of the crank arm shaft, and a closing / opening indicator panel fixed on the closing / opening indicator connecting block and capable of rotating synchronously with the crank arm shaft. The cover plate is installed on the three-phase fixed support frame and covers the closing / opening indicator unit. The cover plate has an observation window. The closing / opening indicator panel is marked with "closed" and "open". When the outer crank arm rotates to the open position, the crank arm shaft synchronously drives the closing / opening indicator panel to rotate until the open mark is exposed in the observation window. When the outer crank arm rotates to the closed position, the crank arm shaft synchronously drives the closing / opening indicator panel to rotate until the closed mark is exposed in the observation window.

[0008] This invention is not limited by the type of operating mechanism, installation location, or transmission chain structure, and the output is directly from the circuit breaker body. The feedback of the opening and closing status is synchronized with the equipment operation, providing a direct and accurate effect, thus accurately indicating the opening and closing status of the circuit breaker body.

[0009] The support assembly of this utility model includes a lateral positioning end cover and a bushing. The lateral positioning end cover is a T-shaped cylinder, and the bushing is installed inside the lateral positioning end cover and sleeved on the crank arm shaft.

[0010] The opening and closing indicator connecting block of this utility model is a cylinder with a countersunk hole on its front end face. The opening and closing indicator connecting block is connected to the end of the crank arm shaft through a connecting component installed in the countersunk hole. The opening and closing indicator panel is fan-shaped, with the closing and opening indicators respectively arranged radially along the opening and closing indicator panel, and the central corner of the opening and closing indicator panel is fixed to the front end face of the opening and closing indicator connecting block.

[0011] The opening and closing indicator units of this utility model are arranged on a three-phase fixed support frame along the three-phase orthogonal direction. The sealing plate is a cover plate structure that covers each phase opening and closing indicator unit. The observation window on the sealing plate corresponds to the closing and opening markings on the opening and closing indicator panel of each phase opening and closing indicator unit.

[0012] The closing and opening indicators of this utility model are represented by different colored text indicating closing and opening, and are affixed to the closing and opening indicator panel with adhesive backing.

[0013] The crank arm shaft described in this invention is made of 20Cr13 stainless steel round steel. This material has good machinability, high hardness, and wear resistance, and can withstand large torque and high impact loads.

[0014] The crank arm shaft and the opening / closing indicator connecting block, as well as the opening / closing indicator connecting block and the opening / closing indicator panel, of this utility model are all connected by bolts, which facilitates disassembly, maintenance and replacement.

[0015] The opening / closing indicator connecting block of this invention is made of hard aluminum alloy 2A12 because it only transmits low torque. This material meets the required mechanical strength while having excellent machinability, which helps to reduce processing costs.

[0016] The bushing of this invention is made of SF-1 composite material with self-lubricating properties and a compressive strength ≥280MPa.

[0017] The included angle between the two radial sides of the opening and closing indicator panel of this utility model is 51.7 degrees.

[0018] Compared with the prior art, the present invention has the following significant advantages:

[0019] (1) This utility model can achieve direct drive precise feedback: the opening and closing signals are directly mechanically output by the crank arm shaft, eliminating intermediate transmission errors and enabling strict synchronization between position indication and circuit breaker operation.

[0020] (2) This utility model can realize three-phase independent monitoring: each phase indicator is independently installed on the support frame, without interfering with each other, and accurately reflects the single-phase switching status.

[0021] (3) This utility model can realize visual human-computer interaction: the modular panel and the observation window form a closed observation interface, which has strong anti-interference ability and intuitive and efficient status identification.

[0022] (4) This utility model breaks through the limitations of traditional design on the type of operating mechanism, installation position and transmission chain structure. It is compatible with both three-phase linkage and phase-by-phase operation modes, applicable to various circuit breaker structure types, and can avoid misoperation caused by improper opening and closing indication, prevent accidents, and reduce product costs.

[0023] (5) This utility model has a simple structure, low cost, and strong practicality, and is suitable for widespread promotion and use. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Figure 1a This is a top view of the three-phase linkage of the circuit breaker crank arm box (closed state);

[0026] Figure 1b This is a schematic diagram of the three-phase linkage of the circuit breaker crank arm box (closed state);

[0027] Figure 2a This is a top view of the three-phase linkage of the circuit breaker crank arm box (opening state);

[0028] Figure 2b This is a schematic diagram of the three-phase linkage of the circuit breaker crank arm box (open state);

[0029] Figure 3a This is a three-phase linkage cross-sectional view of the circuit breaker crank arm box (closed state);

[0030] Figure 3b This is a schematic diagram of the main components of this utility model (closed state);

[0031] Figure 3c is Figure 3b A schematic diagram of direction A (closed state);

[0032] Figure 4a This is a three-phase linkage sectional view of the circuit breaker crank arm box (opening state);

[0033] Figure 4b This is a schematic diagram of the main component of this utility model (open state);

[0034] Figure 4c yes Figure 4b A schematic diagram of direction B (opening state);

[0035] Figure 5 This is a cross-sectional view of the opening and closing indicator connection block of this utility model;

[0036] Figure 6 This is a schematic diagram of the main opening and closing indicator panel of this utility model.

[0037] In the diagram: 1-Opening / closing indicator unit, 2-Outer crank arm, 3-Crank arm box, 4-Three-phase fixed support frame, 5-Phase transmission rod, 6-Circuit breaker hydraulic operating mechanism, 7-Mechanism housing, 8-Hydraulic mechanism support assembly, 9-Circuit breaker moving end flange, 101-Observation window, 102-Opening / closing indicator panel assembly, 103-Opening / closing indicator connecting block, 104-Side positioning end cover, 105-Shaft sleeve, 106-Crank arm shaft, 107-Sealing plate, 108-Counterhole, 102a-Opening / closing indicator panel, 102b-Closing mark, 102c-Opening mark, 301-Crank arm inside the crank arm box. Detailed Implementation

[0038] 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 embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0039] like Figure 1a , Figure 1b , Figure 2a , Figure 2b , Figure 3a , Figure 3b Figure 3c Figure 4a , Figure 4b , Figure 4c , Figure 5 and Figure 6As shown, the GIS circuit breaker crank arm box consists of an opening / closing indicator, an outer crank arm 2, a crank arm box 3, a three-phase fixed support frame 4, a phase-to-phase transmission rod 5, a circuit breaker hydraulic operating mechanism 6, a mechanism housing 7, a hydraulic mechanism support assembly 8, and a circuit breaker moving end flange 9. All components and crank arms are connected by pins. When the circuit breaker hydraulic operating mechanism 6 operates, the internal piston rod drives the crank arm of the hydraulic mechanism support assembly 8 to swing accordingly, and drives the phase-to-phase transmission rod 5 to achieve synchronous opening and closing of the three-phase crank arm box 3. This utility model provides an opening / closing indicator for a GIS circuit breaker crank arm box based on the three-phase fixed support frame 4 and a crank arm shaft 106 protruding from the outer side of the crank arm box. The circuit includes a circuit breaker indicator unit 1 and a sealing plate 107. The circuit breaker indicator unit 1 includes an opening on a three-phase fixed support frame 4, a support assembly in the opening for supporting the rotation of the crank arm shaft 106 of the crank arm box 3 outer crank arm 2, a circuit breaker indicator connecting block 103 connected to the end of the crank arm shaft 106, and a circuit breaker indicator panel 102a fixed on the circuit breaker indicator connecting block 103 and rotating synchronously with the crank arm shaft 106. The crank arm shaft 106 is made of 20Cr13 stainless steel round steel. The sealing plate 107 is installed on the three-phase fixed support frame 4 and covers the opening and closing indicator unit 1. The sealing plate 107 has an observation window 101 with a transparent plate. The opening and closing indicator panel 102a is marked with closing and opening. When the outer crank arm 2 rotates to the opening position, the crank arm shaft 106 synchronously drives the opening and closing indicator panel 102a to rotate until the opening mark is exposed in the observation window 101. When the outer crank arm 106 rotates to the closing position, the crank arm shaft 106 synchronously drives the opening and closing indicator panel 102a to rotate until the closing mark is exposed in the observation window 101.

[0040] The support assembly includes a lateral positioning end cap 104 and a bushing 105. The lateral positioning end cap 104 is a T-shaped cylinder, which is threadedly fixed in an opening on the three-phase fixed support frame 4 and coaxially arranged with the crank arm shaft 106 (an M12 bolt through hole is provided at the bottom of the lateral positioning end cap 104, and the lateral positioning end cap 104 is rigidly connected to the three-phase fixed support frame 4 by bolt tightening, forcing the axis of the crank arm shaft 106 to be precisely aligned). The bushing 105 is tightly installed inside the lateral positioning end cap 104 and sleeved on the shaft section of the crank arm shaft 106 extending to the outside of the crank arm box, thereby positioning the crank arm shaft 106 with the three-phase fixed support frame 4 and fixing it by the lateral positioning end cap 104, ensuring low rotational resistance and no axial displacement. A small clearance fit is formed between the bushing 105 and the crank arm shaft 106, allowing the crank arm shaft 106 to rotate flexibly. The bushing 105 is made of SF-1 composite material, which has a compressive strength ≥280MPa and excellent self-lubricating properties. When used in conjunction with the lateral positioning end cover 8, it can achieve a low coefficient of friction (0.04~0.20) without external lubrication, while effectively restraining the radial displacement of the crank arm shaft 106, ensuring that the opening and closing indicator panel 102a is accurately positioned in the visible position of the observation window.

[0041] The opening / closing indicator connecting block 103 is cylindrical, and because it only transmits low torque, it is made of hard aluminum alloy 2A12. This material meets the required mechanical strength while having excellent machinability, which helps to reduce processing costs. Two internally threaded countersunk holes 108 are provided on the front end face of the opening / closing indicator connecting block 103. The opening / closing indicator connecting block 103 is connected to the end of the crank arm shaft 106 by installing bolts in the countersunk holes 108, allowing it to rotate synchronously with the crank arm shaft 106. A certain gap exists between the opening / closing indicator connecting block 103 and the positioning end cover 104. The opening / closing indicator panel 102a is a fan-shaped stainless steel sheet with an included angle of 51.7 degrees between its two radial sides, consistent with the rotation angle of the circuit breaker crank arm. The closing indicator 102b and the opening indicator 102c are radially arranged along the corresponding areas of the two radial sides of the opening / closing indicator panel 102a, each located at the center of the two radial sides, achieving the operation indication of the opening / closing labels with the minimum effective area of ​​the panel. The closing indicator 102b and the opening indicator 102c are also installed on the upper surface of the opening and closing indicator panel according to the rotation angle of the opening and closing. That is, the opening and closing angles of its two radial sides are strictly matched with the rotation angle of the crank arm 301 in the circuit breaker crank arm box, ensuring that the opening and closing indicator panel 102a rotates synchronously with the crank arm shaft 106 as the center, and its angular displacement is completely consistent with the circuit breaker's operating trajectory. The central corner of the opening and closing indicator panel 102a is fixed to the front end face of the opening and closing indicator connecting block 103. The opening and closing indicator panel 102a is perpendicular to the opening and closing indicator connecting block 103 and rotates synchronously with the opening and closing indicator connecting block 103 and the crank arm shaft 106. The opening and closing indicator panel 102a, the closing indicator 102b, and the opening indicator 102c constitute the opening and closing indicator panel assembly 102.

[0042] The opening and closing indicator units 1 are arranged along the three-phase orthogonal direction. The cover plate 107 is a cover plate structure, which forms a semi-enclosed space with the observation window 101. The window is integrated into the top of the three-phase fixed support frame 4 through the cover plate 107, forming a closed and visual status observation interface. The observation window 101 has a rectangular observation opening that matches the size of the opening and closing indicators. The cover plate 107 covers each phase opening and closing indicator unit 1. Observation windows 101 are evenly distributed on the cover plate 107 along the three-phase orthogonal direction, which correspond to the closing and opening indicators on the opening and closing indicator panel 102a of each phase opening and closing indicator unit 1. The closing indicator 102b or opening indicator 102c that matches the status of the circuit breaker body can be clearly seen from above with the naked eye.

[0043] The closing indicator 102b and the opening indicator 102c are printed with "open" and "close" markings in different colors (red / green), precisely covering the extreme positions of the corresponding opening and closing actions on the panel to indicate opening and closing. The markings are installed using adhesive backing, which facilitates adjustment of the installation position and synchronously matches the rotation angle of the opening and closing indicator panel 102a with the crank arm shaft 106.

[0044] The working principle of this utility model is as follows: When the circuit breaker is in the open state, the open indicator 102c on the open / close indicator panel 102a faces the visible area of ​​the observation window 101. When performing the closing operation, the power of the circuit breaker hydraulic operating mechanism 6 drives the outer crank arm 2 of the crank arm box 3 to swing clockwise through the crank arm of the hydraulic mechanism bracket assembly 8 and the phase-to-phase transmission rod 5, causing the crank arm shaft 106 to rotate clockwise around the axis by a designed angle of 51.7°. Since the open / close indicator connecting block 103 is rigidly connected to the crank arm shaft 106 by bolts, and the open / close indicator panel 102a is also rigidly fixed on the open / close indicator connecting block 103, the panel rotates synchronously with the shaft by 51.7°. Based on the matching design of panel size and rotation angle, after rotation, the trip indicator 102c, originally located below the observation window, is moved to the area blocked by the cover plate 107, while the closing indicator 102b precisely cuts into the visible area of ​​the observation window, forming a "trip hidden - closing displayed" state switching effect, thereby achieving strict synchronous feedback between tripping and closing actions and visual indicators. The tripping operation principle is the reverse.

[0045] It should be understood that this embodiment is for illustrative purposes only and is not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A switching indicator for a GIS circuit breaker crank arm box, characterized in that: The device includes a circuit breaker indicator unit and a cover plate. The circuit breaker indicator unit includes an opening on a three-phase fixed support frame, a support assembly in the opening for supporting the rotation of the crank arm shaft of the crank arm box, a circuit breaker indicator connecting block connected to the end of the crank arm shaft, and a circuit breaker indicator panel fixed on the circuit breaker indicator connecting block and rotating synchronously with the crank arm shaft. The cover plate is installed on the three-phase fixed support frame and covers the circuit breaker indicator unit. The cover plate has an observation window. The circuit breaker indicator panel is marked with "closed" and "open". When the outer crank arm rotates to the open position, the crank arm shaft synchronously drives the circuit breaker indicator panel to rotate until the open mark is exposed in the observation window. When the outer crank arm rotates to the closed position, the crank arm shaft synchronously drives the circuit breaker indicator panel to rotate until the closed mark is exposed in the observation window.

2. The opening / closing indicator for a GIS circuit breaker crank arm box according to claim 1, characterized in that: The support assembly includes a lateral positioning end cap and a bushing. The lateral positioning end cap is a T-shaped cylinder, and the bushing is installed inside the lateral positioning end cap and sleeved on the crank arm shaft.

3. The opening / closing indicator for a GIS circuit breaker crank arm box according to claim 2, characterized in that: The opening and closing indicator connecting block is a cylinder with a countersunk hole on its front end face. The opening and closing indicator connecting block is connected to the end of the crank arm shaft by installing a connecting component in the countersunk hole. The opening and closing indicator panel is fan-shaped, with the closing and opening indicators respectively arranged radially along the opening and closing indicator panel. The central corner of the opening and closing indicator panel is fixed to the front end face of the opening and closing indicator connecting block.

4. The opening / closing indicator for a GIS circuit breaker crank arm box according to claim 3, characterized in that: The opening and closing indicator units are arranged on the three-phase fixed support frame along the three-phase orthogonal direction. The cover plate is a cover plate structure that covers the opening and closing indicator units of each phase. The observation window on the cover plate corresponds to the closing and opening marks on the opening and closing indicator panel of each phase's opening and closing indicator unit.

5. The opening / closing indicator for a GIS circuit breaker crank arm box according to claim 4, characterized in that: The closing and opening indicators are represented by different colored text and are affixed to the closing and opening indicator panel with adhesive backing.

6. The opening / closing indicator for a GIS circuit breaker crank arm box according to claim 5, characterized in that: The crank arm shaft is made of 20Cr13 stainless steel round steel.

7. The opening / closing indicator for a GIS circuit breaker crank arm box according to claim 6, characterized in that: The crank arm shaft and the opening / closing indicator connecting block, as well as the opening / closing indicator connecting block and the opening / closing indicator panel, are all connected by bolts.

8. The opening / closing indicator for a GIS circuit breaker crank arm box according to claim 7, characterized in that: The opening and closing indicator connection block is made of hard aluminum alloy 2A12.

9. The opening / closing indicator for a GIS circuit breaker crank arm box according to claim 8, characterized in that: The bushing is made of SF-1 composite material with self-lubricating properties and a compressive strength ≥280MPa.

10. The opening / closing indicator for a GIS circuit breaker crank arm box according to claim 9, characterized in that: The included angle between the two radial sides of the opening and closing indicator panel is 51.7 degrees.

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