Mechanical interlocking device for fixed middle-high voltage switch cabinet

Abstract

The utility model discloses a mechanical interlocking device for a fixed middle-high voltage switch cabinet, which comprises an isolating switch and an elastic operation mechanism, the elastic operation mechanism comprises a mechanism box, an upper interlocking main shaft, a closing push plate, a closing half shaft, a closing retaining plate, a closing coil, a driving plate, a positioning column and a limiting plate, and the isolating switch is connected with the upper interlocking main shaft. The driving plate is located in the mechanism box, the part of one end of the driving plate extending outwards from the guide hole of the mechanism box is connected with the upper interlocking main shaft through a transmission part, and the other end of the driving plate is connected with the limiting plate; the limiting plate is installed in the mechanism box through the positioning column and rotates with the positioning column as the center. The switching-on push plate and the switching-on half shaft are both installed in the mechanism box, and when the limiting plate abuts against the switching-on push plate, the switching-on push plate and the switching-on half shaft cannot rotate; and when the limiting plate releases the limiting of the closing push plate, the closing push plate drives the closing half shaft to rotate. The mechanical interlocking device perfects the interlocking function in the circuit breaker.

Description

Technical Field

[0001] This utility model relates to the technical field of mechanical interlocking devices, and in particular to a mechanical interlocking device for fixed medium and high voltage switchgear. Background Technology

[0002] Currently, the fixed medium- and high-voltage switchgear used in power grids has design flaws that allow circuit breakers to be reclosed after being opened, posing a risk of accidental circuit breaker reclosing. This seriously violates the "five protections" requirements for power equipment (especially the principles of preventing accidental opening and closing of circuit breakers and preventing the closing of grounding switches while energized), and may also cause personal safety hazards during maintenance due to improper operation or equipment failure. In addition to the electrical (secondary) and mechanical interlocking designs within the cabinet, fixed medium- and high-voltage switchgear must also have corresponding interlocking functions within the fixed circuit breakers themselves to meet the basic "five protections" requirements, particularly the mechanical interlocking of circuit breaker closing / opening operations with disconnector closing / opening operations. Utility Model Content

[0003] The technical problem to be solved by this utility model is: in order to overcome the shortcomings of the existing technology, a mechanical interlocking device for fixed medium and high voltage switchgear is provided, which improves the interlocking function inside the fixed circuit breaker, and does not require major modifications to the internal structure of the fixed circuit breaker body. It has strong compatibility and low cost.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a mechanical interlocking device for a fixed medium- and high-voltage switchgear. The mechanical interlocking device includes a disconnecting switch and a spring-operated mechanism. The spring-operated mechanism includes a mechanism box, an upper interlocking main shaft, a closing push plate, a closing half shaft, a closing holding plate, and a closing coil. The spring-operated mechanism also includes a drive plate, a positioning column, and a limit plate. The upper interlocking main shaft is located outside the mechanism box. The disconnecting switch is connected to the upper interlocking main shaft through transmission parts. The drive plate is located in the mechanism box, and one end of the drive plate extends outward from the guide hole of the mechanism box through a transmission part. The component is connected to the upper interlocking main shaft, and the other end of the drive plate is connected to the limiting plate. The limiting plate is installed in the mechanism box through the positioning column, and the limiting plate rotates around the positioning column. The closing push plate, closing half shaft, closing retaining plate, and closing coil are all installed in the mechanism box. When the limiting plate presses against the closing push plate, the closing push plate and the closing half shaft cannot rotate. When the limiting plate releases its restriction on the closing push plate, the closing coil pushes the closing push plate, and the closing push plate drives the closing half shaft to rotate. After the closing half shaft rotates to its position, the closing retaining plate fixes the position of the closing half shaft.

[0005] To be further specific, in the above technical solution, a reset spring is configured on the drive board.

[0006] To be further specific, in the above technical solution, the closing push plate and the closing half shaft are fixedly connected by screws.

[0007] The beneficial effects of this utility model are: the mechanical interlocking device for fixed medium and high voltage switchgear of this utility model improves the interlocking function inside the fixed circuit breaker by adding three parts: drive plate, positioning column and limit plate, while not requiring major modifications to the internal structure of the fixed circuit breaker body, and has strong compatibility and low cost. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 ;

[0010] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 ;

[0011] Figure 3 This is a schematic diagram of the structure of this utility model. Figure 3 .

[0012] The numbers in the diagram are: 1. Upper interlocking spindle; 2. Drive plate; 3. Positioning column; 4. Limit plate; 5. Closing push plate; 6. Closing half shaft; 7. Closing holding plate; 8. Closing coil. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0014] See Figure 1 , Figure 2 and Figure 3This utility model discloses a mechanical interlocking device for a fixed medium- and high-voltage switchgear. The mechanical interlocking device includes a disconnecting switch and a spring-operated mechanism. The spring-operated mechanism includes a mechanism housing, an upper interlocking main shaft 1, a closing push plate 5, a closing half-shaft 6, a closing holding plate 7, and a closing coil 8. The spring-operated mechanism also includes a drive plate 2, a positioning post 3, and a limit plate 4. The upper interlocking main shaft 1 is located outside the mechanism housing. The disconnecting switch is connected to the upper interlocking main shaft 1 through transmission parts. The drive plate 2 is located inside the mechanism housing, and one end of the drive plate 2, extending outward from the guide hole of the mechanism housing, is connected to the upper interlocking main shaft 1 through transmission parts. The other end of the moving plate 2 is connected to the limiting plate 4; the limiting plate 4 is installed in the mechanism box through the positioning column 3, and the limiting plate 4 rotates around the positioning column 3; the closing push plate 5, the closing half shaft 6, the closing holding plate 7 and the closing coil 8 are all installed in the mechanism box. When the limiting plate 4 presses against the closing push plate 5, the closing push plate 5 and the closing half shaft 6 cannot rotate; when the limiting plate 4 releases the limiting on the closing push plate 5, the closing coil 8 pushes the closing push plate 5, and the closing push plate 5 drives the closing half shaft 6 to rotate. After the closing half shaft 6 rotates to the position, the closing holding plate 7 fixes the position of the closing half shaft 6.

[0015] Preferably, the drive plate 2 is equipped with a return spring, which ensures the necessary movement stroke while maintaining reliable contact with the limit plate 4, making the interlocking system efficient and flexible in function switching.

[0016] The closing push plate 5 and the closing half shaft 6 are fixedly connected by screws. When the closing half shaft 6 rotates at a certain angle, the mechanism closes the circuit.

[0017] The working principle of this mechanical interlocking device is as follows:

[0018] When the disconnecting switch in the switchgear is tripped, the disconnecting switch is connected to the upper interlocking main shaft 1 on the spring-operated mechanism through transmission parts, so that the upper interlocking main shaft 1 is in a position... Figure 3 The position shown; the drive plate 2 is positioned through the guide hole of the mechanism box. Figure 3 As shown in the image; the upper interlocking spindle 1 rotates clockwise, causing the drive plate 2 to move downwards. The drive plate 2 pushes the limit plate 4 to rotate clockwise around the positioning pin 3 to the position shown in the image. Figure 3 At the position shown, the limit plate 4 presses against the closing push plate 5, and the pressed closing push plate 5 prevents the closing half shaft 6 from rotating clockwise to perform the closing operation.

[0019] When the disconnector switch in the switchgear is closed, the upper interlocking main shaft 1 rotates counterclockwise, driving the drive plate 2 upward. Under the driving action of the drive plate 2, the limit plate 4 rotates counterclockwise, releasing the limit plate 4 from the limiting state of the closing push plate 5. Upon receiving an electric or manual closing command, the closing push plate 5 of the spring-loaded mechanism drives the closing half-shaft 6 to rotate clockwise, realizing the closing of the disconnector switch.

[0020] This utility model discloses a mechanical interlocking device for fixed medium- and high-voltage switchgear, which improves the interlocking function of the switch and eliminates operational safety hazards. Specifically, without affecting the performance of the existing fixed circuit breaker, three new parts—drive plate 2, positioning column 3, and limit plate 4—are added, improving the internal interlocking function of the fixed circuit breaker. This design requires no major modifications to the internal structure of the fixed circuit breaker, offering strong compatibility and low cost. The addition of only a very small number of parts—drive plate 2 and limit plate 4 are sheet metal parts, while positioning column 3 is a machined part—results in low processing costs and ease of mass production. Furthermore, the newly added drive plate 2, positioning column 3, and limit plate 4 are easy to install, allowing them to be installed together in the batch assembly of modular mechanisms without requiring position or angle adjustments. The added interlocking parts do not affect the original switch and mechanism layout or assembly, have no impact on the switch's mechanical parameters, and their installation and testing do not require adjustments to existing production processes. Additionally, this design prevents accidental operation of the mechanism, closing the circuit breaker when the grounding switch is in the closed position.

[0021] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A mechanical interlocking device for a fixed medium- and high-voltage switchgear, the mechanical interlocking device comprising a disconnecting switch and a spring-operated mechanism, the spring-operated mechanism comprising a mechanism box, an upper interlocking main shaft (1), a closing push plate (5), a closing half shaft (6), a closing holding plate (7), and a closing coil (8), characterized in that: The spring-loaded mechanism also includes a drive plate (2), a positioning post (3), and a limiting plate (4). The upper interlocking spindle (1) is located outside the mechanism housing, and the disconnecting switch is connected to the upper interlocking spindle (1) through transmission parts. The drive plate (2) is located in the mechanism box, and one end of the drive plate (2) extends outward from the guide hole of the mechanism box and is connected to the upper interlocking spindle (1) through the transmission parts. The other end of the drive plate (2) is connected to the limiting plate (4). The limiting plate (4) is installed in the mechanism box through the positioning column (3), and the limiting plate (4) rotates around the positioning column (3); The closing push plate (5), closing half shaft (6), closing holding plate (7), and closing coil (8) are all installed in the mechanism box. When the limiting plate (4) presses against the closing push plate (5), neither the closing push plate (5) nor the closing half shaft (6) can rotate. When the limiting plate (4) releases the limiting on the closing push plate (5), the closing coil (8) pushes the closing push plate (5) and the closing push plate (5) drives the closing half shaft (6) to rotate. After the closing half shaft (6) rotates to the position, the closing holding plate (7) fixes the position of the closing half shaft (6).

2. The mechanical interlocking device for a fixed medium- and high-voltage switchgear according to claim 1, characterized in that: A reset spring is provided on the drive plate (2).

3. The mechanical interlocking device for a fixed medium- and high-voltage switchgear according to claim 1, characterized in that: The closing push plate (5) and the closing half shaft (6) are fixedly connected by screws.

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