An isolation facility

Abstract

This utility model provides an isolation mechanism, comprising: an isolation operating shaft with a first driven crank arm assembly, the first driven crank arm assembly having a first drive shaft; a grounding operating shaft with a second driven crank arm assembly, the second driven crank arm assembly having a second drive shaft; and an output shaft rotatably mounted on a switch body and used to drive the knife switch actuation. A drive plate is fixedly mounted on the output shaft, the drive plate having a positioning block located in the center and two symmetrically distributed track grooves on both sides of the positioning block, the two track grooves respectively allowing the corresponding first drive shaft and second drive shaft to move within them. In the open position, the first drive shaft and second drive shaft respectively abut against the sides of the positioning block; during the open position, the first drive shaft and second drive shaft simultaneously abut against the sides of the positioning block, and maintain double-axis abutment against the positioning block before the spring passes through the center, thereby ensuring that the knife switch position does not rotate, improving reliability compared to the prior art.

Description

Technical Field

[0001] This utility model relates to the field of switch technology, specifically to an isolation mechanism. Background Technology

[0002] A three-position disconnector is a key component in high-voltage switchgear, its core function being to achieve reliable circuit isolation and grounding protection. It uses a rotatable disconnector to switch between three predetermined positions (closed, open, and grounded) to respectively complete operations such as main circuit connection, main circuit complete isolation, and main circuit side grounding, thus meeting different safety requirements during power system operation and maintenance.

[0003] However, existing three-position disconnect switches have a significant defect during operation: when the disconnector moves from the open position to the closed or grounded position, before the energy storage spring of the drive mechanism (such as a cam or linkage system) completes its critical "over-center" action (i.e., releasing energy by passing the dead point), the disconnector may sometimes rotate prematurely due to gaps, inertia, or structural fit issues. This causes repeated arcing between the disconnector and the stationary contact, resulting in severe burning damage to the contacts and contact seats, reducing the electrical life and reliability of the switch. Utility Model Content

[0004] Therefore, the technical problem to be solved by this utility model is to overcome the defect in the prior art where the knife switch rotates prematurely, resulting in arcing, thereby providing a highly reliable isolation mechanism.

[0005] Therefore, this utility model provides an isolation mechanism, including an isolation operating shaft, a grounding operating shaft, and an output shaft. Both the isolation operating shaft and the grounding operating shaft are rotatably mounted on the switch body. The isolation operating shaft is provided with a first driven crank arm assembly, which has a first drive shaft offset from its rotation center. The grounding operating shaft is provided with a second driven crank arm assembly, which has a second drive shaft offset from its rotation center. The output shaft is rotatably mounted on the switch body and is used to drive the knife switch. A drive plate is fixedly mounted on the output shaft. The drive plate has a positioning block located in the middle and two symmetrically distributed track grooves on both sides of the positioning block. The two track grooves respectively allow the corresponding first drive shaft and second drive shaft to move within them. In the open position, the first drive shaft and the second drive shaft respectively abut against the two sides of the positioning block. During the switching from the open position to the closed position or the grounding position, and before the energy storage spring passes through the center, the first drive shaft and the second drive shaft respectively abut against the two sides of the positioning block.

[0006] Both track slots include a first slot adjacent to the positioning block and a second slot away from the positioning block. The track slots are inverted V-shaped, wherein the first slot is a straight slot and the second slot is an arc-shaped slot. During the switching from the open position to the closed position, and before the energy storage spring passes the center, the first drive shaft moves along the first slot of one of the track slots, and the second drive shaft abuts against the positioning block. During the switching from the open position to the ground position, and before the energy storage spring passes the center, the second drive shaft moves along the first slot of the other track slot, and the first drive shaft abuts against the positioning block.

[0007] A drive block is provided in the middle of the track groove. After the energy storage spring passes through the center, the first drive shaft or the second drive shaft cooperates with the corresponding drive block to drive the output shaft to move through the drive plate.

[0008] Both the first drive shaft and the second drive shaft are fitted with roller sleeves, and the roller sleeves are in contact with the inner wall of the track groove.

[0009] Both the first driven crank arm assembly and the second driven crank arm assembly include two driven crank arms arranged opposite each other. The two driven crank arms are mounted on the same drive shaft, and the two driven crank arms are riveted together by a plurality of rivets.

[0010] The output shaft has a plug at its end, and the drive plate has a slot for inserting the plug.

[0011] The technical solution of this utility model has the following advantages:

[0012] 1. The isolation mechanism provided by this utility model, when in the open position, has the first drive shaft and the second drive shaft simultaneously abutting against both sides of the positioning block, and the dual shafts remain pressed against the positioning block before the spring passes through the center, thereby ensuring that the position of the knife switch will not rotate, which improves reliability compared with the prior art.

[0013] 2. The isolation mechanism provided by this utility model converts sliding friction into rolling friction through the roller sleeve, reducing friction and thus extending service life.

[0014] 3. The isolation mechanism provided by this utility model uses double crank arms fixed with rivets, which solves the problem of shaft displacement caused by deformation of a single crank arm and improves reliability. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0016] Figure 1 This is a top view of the isolation mechanism of this utility model;

[0017] Figure 2 A three-dimensional diagram of the isolation facility;

[0018] Figure 3 This is the front view of the isolation mechanism;

[0019] Figure 4 This is a perspective view of the driven crank arm assembly.

[0020] Explanation of reference numerals in the attached drawings: 1. Isolation operating shaft; 2. Grounding operating shaft; 3. Switch body; 4. First driven crank arm assembly; 5. First drive shaft; 6. Second driven crank arm assembly; 7. Second drive shaft; 8. Output shaft; 9. Drive plate; 10. Positioning block; 11. First slot; 12. Second slot; 13. Track slot; 14. Drive block; 15. Roller sleeve; 16. Driven crank arm; 17. Rivet; 18. Insert block; 19. Slot. Detailed Implementation

[0021] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0022] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] Example

[0026] This embodiment provides an isolation mechanism, such as Figure 1 As shown, it includes isolation operation shaft 1, grounding operation shaft 2, and output shaft 8.

[0027] Both the isolating operating shaft 1 and the grounding operating shaft 2 are rotatably mounted on the switch body 3, such as... Figure 2 and Figure 3 As shown, a first driven crank arm assembly 4 is provided on the isolation operating shaft 1, and a first drive shaft 5 offset from its rotation center is provided on the first driven crank arm assembly 4. A second driven crank arm assembly 6 is provided on the grounding operating shaft 2, and a second drive shaft 7 offset from its rotation center is provided on the second driven crank arm assembly 6. In this embodiment, as shown... Figure 4 As shown, both the first driven crank arm assembly 4 and the second driven crank arm assembly 6 include two oppositely arranged driven crank arms 16, with the same drive shaft mounted on the two driven crank arms 16, and the two driven crank arms 16 are riveted together by a plurality of rivets 17. Both the first drive shaft 5 and the second drive shaft 7 are fitted with roller sleeves 15, and the roller sleeves 15 are in contact with the inner wall of the track groove 13.

[0028] The output shaft 8 is rotatably mounted on the switch body 3 and is used to drive the knife switch. A drive plate 9 is fixedly mounted on the output shaft 8. Figure 3As shown, the drive plate 9 has a positioning block 10 located in the middle, and two track grooves 13 symmetrically distributed on both sides of the positioning block 10. The two track grooves 13 are respectively for the corresponding first drive shaft 5 and second drive shaft 7 to move within them. Each track groove 13 includes a first groove 11 adjacent to the positioning block 10 and a second groove 12 away from the positioning block 10. The track groove 13 is inverted V-shaped, wherein the first groove 11 is a straight groove and the second groove 12 is an arc-shaped groove. A drive block 14 is provided in the middle of the track groove 13. In the open position, the first drive shaft 5 and the second drive shaft 7 respectively abut against the two sides of the positioning block 10. During the switching from the open position to the closed position, and before the energy storage spring passes through the center, the first drive shaft 5 moves along the first groove 11 of one of the track grooves 13, and the second drive shaft 7 abuts against the positioning block 10. During the switching from the open position to the ground position, and before the energy storage spring passes through the center, the second drive shaft 7 moves along the first groove 11 of the other track groove 13, and the first drive shaft 5 abuts against the positioning block 10. After the energy storage spring passes through the center, the first drive shaft 5 or the second drive shaft 7 cooperates with the corresponding drive block 14 to drive the output shaft 8 through the drive plate 9. The end of the output shaft 8 is provided with a plug 18, and the drive plate 9 is formed with a slot 19 for the plug 18 to be inserted. It should be noted that the transmission mechanism between the isolation operation shaft 1 / grounding operation shaft 2 and the energy storage spring is a mature existing technology, so its specific structure and working principle will not be described in detail.

[0029] The working principle of the isolation mechanism of this utility model is as follows:

[0030] When the circuit breaker is in the open position, the first drive shaft 5 and the second drive shaft 7 abut against the two sides of the positioning block 10 respectively, thereby keeping the drive plate 9 and the output shaft 8 stationary and keeping the disconnector in the open position.

[0031] During the transition from the open to the closed position, the isolating operating shaft 1 rotates counterclockwise, and the first drive shaft 5 moves downward along the first groove 11 of the right track groove 13. Before the energy storage spring passes the center, the first drive shaft 5 and the second drive shaft 7 always abut against the positioning block 10, thus keeping the disconnector in a fixed position. After the energy storage spring passes the center, the first drive shaft 5 abuts against the drive block 14 of the right track groove 13, thereby driving the drive plate 9 to rotate clockwise, which in turn drives the output shaft 8 to rotate. During this process, the second drive shaft 7 moves within the second groove 12 of the left track groove 13. It should be noted that before the energy storage spring passes the center, although the movement trajectory of the first drive shaft 5 is arc-shaped and the drive plate 9 rotates counterclockwise at a small angle, this rotation angle is small and can be basically understood as the disconnector position not changing. Only after the energy storage spring passes the center does the first drive shaft 5 drive the drive plate 9 to rotate clockwise by a larger angle.

[0032] Similarly, as the circuit moves from the open position to the ground position, the grounding operation shaft 2 rotates clockwise, and the second drive shaft 7 moves downward along the first groove 11 of the left track groove 13. Before the energy storage spring passes the center, the first drive shaft 5 and the second drive shaft 7 always abut against the positioning block 10, so that the disconnect switch remains in a fixed position. After the energy storage spring passes the center, the second drive shaft 7 abuts against the drive block 14 of the left track groove 13, thereby driving the drive plate 9 to rotate counterclockwise, and then driving the output shaft 8 to rotate. During this process, the first drive shaft 5 moves in the second groove 12 of the right track groove 13.

[0033] The isolation mechanism provided by this utility model, when in the open position, has the first drive shaft 5 and the second drive shaft 7 simultaneously abutting against both sides of the positioning block 10, and the dual shafts remain pressed against the positioning block 10 before the spring passes through the center, thereby ensuring that the position of the knife switch will not rotate, which improves reliability compared with the prior art.

[0034] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. An isolation mechanism, characterized by, include: The isolation operating shaft (1) and the grounding operating shaft (2) are both rotatably mounted on the switch body (3). The isolation operating shaft (1) is provided with a first driven crank arm assembly (4), and the first driven crank arm assembly (4) is provided with a first drive shaft (5) that deviates from its rotation center. The grounding operating shaft (2) is provided with a second driven crank arm assembly (6), and the second driven crank arm assembly (6) is provided with a second drive shaft (7) that deviates from its rotation center. The output shaft (8) is rotatably mounted on the switch body (3) and is used to drive the knife switch. The output shaft (8) is fixedly provided with a drive plate (9). The drive plate (9) has a positioning block (10) located in the middle and two track grooves (13) respectively disposed on both sides of the positioning block (10) and symmetrically distributed. The two track grooves (13) respectively allow the corresponding first drive shaft (5) and second drive shaft (7) to move within them. In the open position, the first drive shaft (5) and the second drive shaft (7) respectively abut against the two sides of the positioning block (10); During the process of switching from the open position to the closed position or the ground position, and before the energy storage spring passes through, the first drive shaft (5) and the second drive shaft (7) respectively abut against the two sides of the positioning block (10).

2. The isolation mechanism of claim 1, wherein, Both track grooves (13) include a first groove (11) adjacent to the positioning block (10) and a second groove (12) away from the positioning block (10). The track grooves (13) are inverted V-shaped, wherein the first groove (11) is a straight groove and the second groove (12) is an arc-shaped groove. During the switching process from the open position to the closed position, and before the energy storage spring passes through the center, the first drive shaft (5) moves along the first groove (11) of one of the track grooves (13), and the second drive shaft (7) abuts against the positioning block (10); During the switching from the open position to the ground position, and before the energy storage spring passes through the center, the second drive shaft (7) moves along the first groove (11) of the other track groove (13), and the first drive shaft (5) abuts against the positioning block (10).

3. The isolation mechanism of claim 2, wherein, A drive block (14) is provided in the middle of the track groove (13). After the energy storage spring passes through the center, the first drive shaft (5) or the second drive shaft (7) cooperates with the corresponding drive block (14) to drive the output shaft (8) to move through the drive plate (9).

4. The isolation mechanism of claim 1, wherein, Both the first drive shaft (5) and the second drive shaft (7) are fitted with roller sleeves (15), and the roller sleeves (15) are in contact with the inner wall of the track groove (13).

5. The isolation mechanism of claim 1, wherein, Both the first driven crank arm assembly (4) and the second driven crank arm assembly (6) include two driven crank arms (16) arranged opposite to each other. The two driven crank arms (16) are mounted on the same drive shaft, and the two driven crank arms (16) are riveted together by a plurality of rivets (17).

6. The isolation mechanism according to claim 1, characterized in that, The output shaft (8) has a plug (18) at its end, and the drive plate (9) is formed with a slot (19) for the plug (18) to be inserted.

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