A mechanical interlocking device and method for gas-insulated switchgear

Abstract

This invention discloses a mechanical interlocking device for gas-insulated switchgear, belonging to the technical field of gas-insulated switchgear. The device includes a limit assembly, a torque steering knuckle assembly, a connecting rod assembly, a drive spring assembly, and a locking assembly. The limit assembly is fixed to the connecting rod assembly with bolts. The connecting rods in each direction are connected by the torque steering knuckle assembly. One end of the connecting rod assembly is connected to the drive spring assembly, and the other end of the drive spring assembly is connected to the locking assembly. This invention achieves forced mechanical interlocking by mechanically associating the cable compartment door with the three-position mechanism and the circuit breaker mechanism, simplifying operation steps, avoiding misoperation and misjudgment, improving the reliability of the interlocking technology, and ensuring the safety of personnel and equipment.

Description

Technical Field

[0001] This invention belongs to the technical field of gas-insulated switchgear, and specifically relates to a mechanical interlocking device and method for gas-insulated switchgear. Background Technology

[0002] Gas-insulated switchgear, as a type of enclosed switchgear, is a major piece of equipment in power supply and distribution systems. It not only plays a role in power transmission and distribution, but also serves as a "maintenance grounding" function during equipment maintenance. When operating the "maintenance grounding" system, the requirements of "five protections" and related operating procedures must be met. At the same time, entry into the relevant compartment is only permitted when the switchgear is switched to the "maintenance grounding" state. To avoid prohibiting the operation of relevant switches or entry into relevant compartments when requirements are not met, a mandatory interlocking function needs to be introduced.

[0003] Traditional mechanical interlocks require secondary confirmation or operation and cannot automatically unlock / lock based on the real-time status of each operating mechanism, increasing the difficulty of operation for maintenance personnel and making it prone to misoperation. In addition, traditional mechanical locking linkages do not have stable sliding support when rotating or moving in the space, and do not consider the effective conversion of the locking torque transmission direction along the path. Furthermore, due to the limitations of the application scenario, the effective movement distance transmitted is limited and jamming is prone to occur, affecting the continuity of action and weakening the stability and reliability of the product. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a mechanical interlocking device and method for gas-insulated switchgear. This invention achieves forced mechanical interlocking by forcibly linking the cable compartment door with the three-position mechanism and the circuit breaker mechanism through mechanical components. While ensuring safety, it simplifies the operation steps, avoids misoperation and misjudgment, and improves the reliability of the interlocking technology.

[0005] The present invention adopts the following technical solution: The first aspect of the present invention discloses a mechanical interlocking device for a gas-insulated switchgear, the device comprising a limit assembly, a torque steering knuckle assembly, a connecting rod assembly, a drive spring assembly, and a locking assembly; The limiting assembly is bolted to the connecting rod assembly, enabling the opening and closing of the three-position mechanism and the circuit breaker mechanism within the gas-insulated switchgear. The connecting rod assembly includes multiple sets of connecting rods for interlocking transmission of the device. These multiple sets of connecting rods are connected by a torque steering knuckle assembly, enabling the conversion of torque direction during opening and closing. One end of the connecting rod assembly is connected to a drive spring assembly, which adjusts the torque to drive the connecting rod. The other end of the drive spring assembly is connected to a locking assembly, one end of which is fixed to the cable compartment door inside the gas-insulated switchgear, achieving forced mechanical interlocking when the cable compartment door is opened or closed. When the cable compartment door is open, the three-position mechanism and the circuit breaker mechanism remain in the closed state through the transmission of the connecting rod assembly.

[0006] Preferably, the limiting component includes an upper limit component located in the three-position mechanism, comprising an upper limit plate and a three-position mechanism position rod. The three-position mechanism position rod passes through a lock hole provided in the upper limit plate. The three-position mechanism position rod moves back and forth according to the grounding / opening state of the three-position mechanism, entering or exiting the lock hole of the upper limit plate, thereby realizing the closing or opening of the three-position mechanism.

[0007] Preferably, the limiting assembly further includes a lower limiting assembly located in the circuit breaker mechanism, comprising a lower limiting plate, a circuit breaker mechanism position rod, and a circuit breaker tripping actuator plate. The circuit breaker mechanism position rod passes through a locking hole provided in the lower limiting plate. The circuit breaker mechanism position rod can move back and forth according to the open / closed state of the circuit breaker mechanism, entering or exiting the locking hole of the lower limiting plate to realize the closing or opening of the circuit breaker mechanism. The lower limiting plate is provided with a bent plate. When the cable compartment door is opened, the bent plate enters the hole of the circuit breaker tripping actuator plate to restrict the movement of the circuit breaker tripping actuator plate, so that the circuit breaker cannot trip after the cable compartment door is opened.

[0008] Preferably, the torque steering knuckle assembly includes a first torque steering knuckle and a second torque steering knuckle, which are rotatably connected to connect linkage assemblies in different directions, thereby realizing the change of torque direction and avoiding jamming during device operation due to different linkage directions.

[0009] Preferably, the linkage assembly includes: a longitudinal linkage assembly, a bracket assembly, a transverse linkage assembly, and a radial linkage assembly. The longitudinal linkage assembly is connected to the transverse linkage assembly via a torque steering knuckle assembly. The other end of the transverse linkage assembly is connected to the radial linkage assembly via a torque steering knuckle assembly, thereby realizing the change and transmission of torque direction. The transverse linkage assembly and the radial linkage assembly pass through the bracket assembly. Multiple bracket assemblies are fixed on the gas-insulated switchgear to fix the linkage assembly and prevent the linkage from twisting when subjected to torque.

[0010] Preferably, the longitudinal linkage assembly includes: a first longitudinal linkage and a second longitudinal linkage, the first longitudinal linkage and the second longitudinal linkage are fixedly connected, the limiting assembly is fixed to the first longitudinal linkage by bolts and moves up and down with the longitudinal linkage assembly, and the height of the locking hole in the limiting assembly is adjusted by the up and down movement of the longitudinal linkage assembly to realize the locking and unlocking of the three-position mechanism and the circuit breaker mechanism.

[0011] Preferably, the bracket assembly is fixed on the switch cabinet and includes a bracket and a sliding ring. The sliding ring is nested in the mounting hole of the bracket and slides in contact with the transverse connecting rod assembly and the radial connecting rod assembly through the sliding ring provided on the bracket assembly, so as to provide support and limit the movement and prevent torsion during movement.

[0012] Preferably, the transverse link assembly converts the torque of the radial link assembly's forward and backward movement into an axial rotational torque through a torque steering knuckle assembly. The axial rotation of the transverse link assembly drives the longitudinal link assembly to move up and down, thus realizing the transmission of the device. Preferably, the radial linkage assembly includes multiple radial linkages that are movably connected by pivot pins and fixed to the switch cabinet by passing through the bracket assembly. One end of each radial linkage is connected to the transverse linkage assembly via a torque steering knuckle assembly, and the other end is connected to the drive spring assembly. The forward and backward movement of the radial linkage assembly drives the transverse linkage assembly to rotate, forming an interlocking relationship.

[0013] Preferably, the drive spring assembly includes: a spring, a stop plate, and a fixing pin. One end of the spring is connected to the bracket assembly, and the other end is connected to the stop plate. The other end of the stop plate is connected to the fixing pin. The fixing pin passes through the locking assembly, and the torque of the spring acts on the locking assembly through the stop plate. Preferably, the locking assembly includes: a rotating buckle plate bracket, an emergency unlocking bolt, a locking hook block, a rotating buckle plate, and a third radial connecting rod. The rotating buckle plate bracket is fixed to the side plate of the cable compartment. One end of the rotating buckle plate is fixed to the rotating buckle plate bracket by a shaft pin. The locking hook block is fixed to the cable compartment door by the emergency unlocking bolt. The locking hook block is provided with a slot to engage or disengage with the rotating buckle plate, thereby opening or closing the cable compartment door. The other end of the rotating buckle plate is fixed to the third radial connecting rod by a shaft pin. The rotating buckle plate drives the third radial connecting rod to move back and forth around the fixed pin. The third radial connecting rod is connected through a fixed pin in the drive spring assembly. The locking hook block moves with the cable compartment door and acts on the third radial connecting rod and the rotating buckle plate.

[0014] A second aspect of the present invention discloses a mechanical interlocking method for gas-insulated switchgear, which, based on the aforementioned mechanical interlocking device for gas-insulated switchgear, includes the following steps: Operate the three-position closing mechanism and the circuit breaker closing mechanism to unlock the limit switch components; When the cable compartment door is opened, the latch assembly acts on the linkage assembly through the drive spring assembly, so that the circuit breaker is automatically locked after the cable compartment door is opened. The driving spring assembly continuously acts on the linkage assembly, and the circuit breaker remains in the closed state. After the staff completes the inspection or maintenance, they close the cable compartment door, perform the circuit breaker tripping and release the three-position grounding operation, and the device returns to the locked state.

[0015] Compared with the prior art, the beneficial effects of the present invention include at least the following: 1. The device described in this invention allows the cable compartment door to be opened only when the three-position grounding is closed and the circuit breaker is closed. After the cable compartment door is opened, grounding is prohibited from being disconnected. The circuit breaker is only allowed to open after the cable compartment door is reliably closed. After the three-position grounding is closed and the circuit breaker is closed, the cable compartment door can be automatically unlocked without secondary confirmation or operation. After the cable compartment door is closed, the circuit breaker mechanism is automatically unlocked without secondary confirmation or operation. This simplifies the operation steps and reduces the difficulty of operation for maintenance personnel while ensuring safety.

[0016] 2. The device described in this invention adopts a mechanical hard connection to ensure the consistency of device execution. The connecting rod is fixed by a bracket assembly. The sliding ring on the bracket assembly can effectively reduce the friction between the connecting rod and the connecting rod without applying grease, thereby improving the smoothness and accuracy of the interlocking mechanism, avoiding secondary pollution caused by applying grease, and also avoiding jamming and refusal to act. This improves the reliability of the interlocking technology, ensures the safety of personnel and equipment, and overcomes the problems of complex structure, low precision, and high friction leading to deviation or jamming in traditional mechanical hard connection interlocking devices.

[0017] 3. Due to the limitations of application scenarios, traditional interlocking devices simply move in a straight line along the side of the equipment. The effective movement distance transmitted to the mechanism is limited and prone to shearing and jamming, affecting the smooth execution of the action. The transverse execution component of this invention uses a transverse connecting rod to transmit the execution torque through axial rotation, saving equipment space and realizing the silk-smooth transmission of the interlocking device. 4. By setting a drive spring assembly on the radial connecting rod, the present invention can provide sufficient torque, avoid the influence of accidental contact due to insufficient torque, and, in conjunction with multiple fixing pin holes on the connecting rod, adjust the torque as needed, thereby improving the accuracy and anti-interference of the interlocking device. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure 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 of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a layout diagram of a gas-insulated switchgear; Figure 2 This is a 3D diagram of a mechanical interlocking device; Figure 3 This is a diagram showing the three-position grounding trip, the interlocking mechanism locked state, and the cable compartment door locked and closed. Figure 4 This is a diagram showing the state of three-position grounding closing, interlocking mechanism unlocking, and cable compartment door being unlocked and closed. Figure 5 This is a diagram showing the state of three-position grounding closing, interlocking mechanism unlocking, and cable compartment door being unlocked and opened. Figure 6 This is a schematic diagram of the longitudinal linkage assembly structure; Figure 7 This diagram shows the circuit breaker tripping, the interlocking mechanism locking state, and the cable compartment door being locked and closed. Figure 8 This is a diagram showing the circuit breaker closed, the interlocking mechanism unlocked, and the cable compartment door unlocked and closed. Figure 9 This is a diagram showing the circuit breaker closing, the interlocking mechanism unlocking, the cable compartment door being unlocked and opened, and the circuit breaker tripping operation. Figure 10 This is a schematic diagram of the torque steering knuckle assembly structure; Figure 11 This is a schematic diagram of the support assembly structure; Figure 12 This is a schematic diagram of the drive spring assembly structure; Figure 13 This is a diagram showing the cable compartment door being locked and the interlocking components being closed. Figure 14 This is a status diagram showing the process of the cable compartment door being unlocked and the interlocking components being opened. Figure 15 This is a diagram showing the cable compartment door being unlocked and the interlocking components being activated. Figure 16 This is a state diagram showing the process of the cable compartment door being unlocked and the interlocking components being closed. In the diagram: 1. Upper limit assembly; 1.1 Upper limit plate; 1.2 Three-position mechanism position rod; 2. Longitudinal linkage assembly; 2.1 First longitudinal linkage; 2.2 Second longitudinal linkage; 3. Lower limit assembly; 3.1 Lower limit plate; 3.2 Circuit breaker mechanism position rod; 3.3 Circuit breaker tripping lever plate; 4. Torque steering knuckle assembly; 4.1 First torque steering knuckle; 4.2 Second torque steering knuckle; 5. Bracket assembly; 5.1 Bracket; 5.2 Sliding ring; 6. Lateral linkage assembly 7. First radial link; 8. Second radial link; 9. Drive spring assembly; 9.1 Spring; 9.2 Baffle; 9.3 Fixing pin; 10. Locking assembly; 10.1 Rotating buckle bracket; 10.2 Emergency unlocking bolt; 10.3 Locking hook block; 10.4 Rotating buckle; 10.5 Third radial link; 11. Upper instrument compartment; 12. Mechanism compartment; 13. Lower instrument compartment; 14. Air box; 15. Pressure relief channel; 16. Cable compartment; 17. Mechanical interlocking device. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of this invention. The embodiments described in this application are merely some embodiments of this invention, and not all embodiments. Based on the spirit of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

[0021] In the description of this invention, it should be noted that the directional or positional relationships such as "front," "middle," "rear," "upper," "middle," and "lower" are based on... Figure 1 The orientations or positional relationships shown are for the convenience of describing the invention and simplifying the description only. They are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0022] like Figure 2 As shown, Embodiment 1 of the present invention provides a mechanical interlocking device for a gas-insulated switchgear. The three-position mechanism and the circuit breaker mechanism are arranged in the switchgear mechanism compartment 12, and the cable compartment 16 is located in the lower rear compartment of the switchgear. The device includes: a limit assembly, a torque steering knuckle assembly 4, a connecting rod assembly, a drive spring assembly 9, and a locking assembly 10.

[0023] The limiting component is fixed to the connecting rod assembly by bolts, and is used to realize the opening and closing of the three-position mechanism and the circuit breaker mechanism. The connecting rod assembly includes multiple sets of connecting rods for interlocking transmission of the device. The connecting rods are connected by a torque steering knuckle assembly 4 to realize the conversion of torque direction and avoid jamming during device operation. One end of the connecting rod assembly is connected to a drive spring assembly 9. The accuracy of the connecting rod's execution position is ensured by adjusting the spring torque. The other end of the drive spring assembly 9 is connected to a locking assembly 10. One end of the locking assembly 10 is fixed to the cable compartment door, and forced mechanical interlocking is realized when the cable compartment door is opened or closed. After the cable compartment door is opened, the three-position mechanism and the circuit breaker mechanism are kept in the closed state through the transmission of the connecting rod assembly. Opening is only allowed after the cable compartment door is reliably closed, avoiding misoperation and misjudgment, improving the reliability of the interlocking technology, and ensuring the safety of personnel and equipment.

[0024] like Figure 3-5 As shown, the limiting component includes: an upper limit component 1, which is located in the three-position mechanism and consists of an upper limit plate 1.1 and a three-position mechanism position rod 1.2. The three-position mechanism position rod 1.2 passes through a lock hole provided in the upper limit plate 1.1. The three-position mechanism position rod 1.2 can move back and forth according to the grounding open / closed state of the three-position mechanism, entering or exiting the lock hole of the upper limit plate 1.1 to realize the closing or opening of the three-position mechanism.

[0025] like Figure 7-9 As shown, the limiting assembly further includes a lower limiting assembly 3, which is located in the circuit breaker mechanism and includes a lower limiting plate 3.1, a circuit breaker mechanism position rod 3.2, and a circuit breaker tripping latch plate 3.3. The circuit breaker mechanism position rod 3.2 passes through a locking hole provided in the lower limiting plate 3.1. The circuit breaker mechanism position rod 3.2 can move back and forth according to the open / closed state of the circuit breaker mechanism, entering or exiting the locking hole of the lower limiting plate 3.1 to realize the closing or opening of the circuit breaker mechanism.

[0026] The lower limit plate 3.1 is provided with a bent plate. When the cable compartment door is opened, the bent plate enters the hole of the circuit breaker tripping actuator plate 3.3 to restrict the movement of the circuit breaker tripping actuator plate 3.3, ensuring that the circuit breaker cannot trip after the cable compartment door is opened, preventing operator error and improving the reliability of the device.

[0027] like Figure 10 As shown, the torque steering knuckle assembly 4 includes a first torque steering knuckle 4.1 and a second torque steering knuckle 4.2, which are rotatably connected. The entire device has two sets for connecting linkage assemblies in different directions to realize the change of torque direction and avoid jamming during device operation due to different linkage directions.

[0028] The linkage assembly includes: a longitudinal linkage assembly 2, a support assembly 5, a transverse linkage assembly 6, and a radial linkage assembly. The longitudinal linkage assembly 2 is connected to the transverse linkage assembly 6 via a torque steering knuckle assembly 4. The other end of the transverse linkage assembly 6 is connected to the radial linkage assembly via the torque steering knuckle assembly 4, thereby realizing the change and transmission of torque direction. The transverse linkage assembly 6 and the radial linkage assembly are fixed through the support assembly 5 to prevent the linkage from twisting when it is subjected to torque. like Figure 6 As shown, the longitudinal linkage assembly 2 includes: a first longitudinal linkage 2.1 and a second longitudinal linkage 2.2. The first longitudinal linkage 2.1 and the second longitudinal linkage 2.2 are fixedly connected. The upper limit plate 1.1 and the lower limit plate 3.1 are fixed to the first longitudinal linkage 2.1 by bolts and move up and down with the longitudinal linkage assembly 2. The height of the locking holes in the upper limit assembly 1 and the lower limit assembly 3 are adjusted by the longitudinal linkage assembly 2 to realize the locking and unlocking of the three-position mechanism and the circuit breaker mechanism.

[0029] like Figure 11 As shown, the bracket assembly 5 is fixed in the switch cabinet and includes: bracket 5.1 and sliding ring 5.2. The sliding ring 5.2 is nested in the mounting hole of bracket 5.1. The bracket assembly 5 slides in contact with the connecting rod through the sliding ring 5.2, providing support and limiting function for the connecting rod, avoiding mechanical torsion of the connecting rod during movement, unlocking and locking, and ensuring the continuity of the device.

[0030] In a preferred but non-limiting embodiment of the present invention, the sliding ring 5.2 is made of brass, which has a low coefficient of friction, making the movement or rotation of the connecting rods in all directions more smooth. It can effectively reduce the friction between the connecting rods without the need for grease, improve the smoothness and accuracy of the interlocking device, and avoid secondary pollution caused by applying grease.

[0031] The transverse link assembly 6 converts the torque of the radial link assembly moving back and forth into an axial rotational torque through the torque steering knuckle assembly 4. The axial rotation of the transverse link assembly 6 drives the longitudinal link assembly 2 to move up and down, thereby realizing the transmission of the device. The radial link assembly includes multiple radial links, which are movably connected by axle pins and fixed through the bracket assembly 5. One end of each radial link is connected to the transverse link assembly 6 via a torque steering knuckle assembly 4, and the other end is connected to the drive spring assembly 9, so that the radial link assembly moving back and forth drives the transverse link assembly 6 to rotate, forming an interlocking relationship.

[0032] Specifically, the radial link assembly includes a first radial link 7 and a second radial link 8, which are movably connected by a pivot pin. One end of the first radial link 7 is connected to the transverse link assembly 6 through a torque steering knuckle assembly 4, and one end of the second radial link 8 is connected to a drive spring assembly 9, so that the radial link moving back and forth drives the transverse link assembly 6 to rotate, forming an interlocking relationship.

[0033] It is worth noting that when the length-to-diameter ratio is too large and the number of radial connecting rods is small, the radial connecting rods are prone to bending deformation during the manufacturing and transfer process, which affects the accuracy and continuity of the transmission. Therefore, the number of radial connecting rods can be adjusted according to the cabinet depth. like Figure 12 As shown, the drive spring assembly 9 includes: a spring 9.1, a baffle 9.2, and a fixing pin 9.3. One end of the spring 9.1 is connected to the bracket assembly 5, and the other end is connected to the baffle 9.2. The other end of the baffle 9.2 is connected to the fixing pin 9.3. The fixing pin 9.3 passes through the locking assembly 10, and the torque of the spring 9.1 acts on the locking assembly 10 through the baffle 9.2.

[0034] The drive spring assembly 9 is independently set and is not limited by the size of other components. It can provide sufficient torque to avoid accidental contact due to insufficient torque. In conjunction with the multiple fixing pin holes on the connecting rod, the torque can be adjusted as needed to improve the accuracy and anti-interference of the interlocking device.

[0035] like Figure 13-16 As shown, the locking assembly 10 includes: a rotating buckle plate bracket 10.1, an emergency unlocking bolt 10.2, a locking hook block 10.3, a rotating buckle plate 10.4, and a third radial connecting rod 10.5.

[0036] The rotating buckle bracket 10.1 is fixed to the side plate of the cable compartment 16. One end of the rotating buckle 10.4 is fixed to the rotating buckle bracket 10.1 by a shaft pin. The rotating buckle bracket 10.1 provides support for the rotating buckle 10.4. The locking hook block 10.3 is fixed to the cable compartment door by an emergency unlocking bolt 10.2. The locking hook block 10.3 is provided with a groove to engage or disengage with the rotating buckle 10.4, so as to open or close the cable compartment door.

[0037] The other end of the rotating buckle plate 10.4 is fixed to the third radial link 10.5 by a pivot pin. The rotating buckle plate 10.4 drives the third radial link 10.5 to move back and forth around the pivot pin. The third radial link 10.5 is fixed by the bracket assembly 5. The third radial link 10.5 is connected to the pivot pin 9.3 in the drive spring assembly 9. The spring assembly 9 drives the third radial link 10.5 backward, generating a backward thrust, which generates a radial holding force for the radial link. This force is transmitted to the lower limit assembly 3, thereby realizing the automatic blocking circuit breaker tripping.

[0038] The locking hook block 10.3 moves with the cable compartment door as it "opens" and "closes," and simultaneously acts on the third radial connecting rod 10.5 and the rotating buckle plate 10.4 to achieve unlocking and locking.

[0039] Specifically, during the opening process of the cable compartment door, the locking hook block 10.3 moves backward, causing the rotating buckle plate 10.4 to rotate clockwise, thereby releasing the engagement with the locking hook block 10.3. At the same time, it drives the third radial link 10.5 to move backward. During the closing process of the cable compartment door, the locking hook block 10.3 moves forward, pushing the third radial link 10.5 forward. The moving third radial link assembly 10.5 pulls the rotating buckle plate 10.4 to rotate counterclockwise, thereby engaging with the locking hook block 10.3.

[0040] Embodiment 2 of the present invention discloses a mechanical interlocking method, based on the mechanical interlocking device for gas-insulated switchgear described in Embodiment 1, comprising the following steps: Step 1: Operate the three-position mechanism to close the circuit breaker and the circuit breaker to close the circuit breaker. At this time, the position lever 1.2 of the three-position mechanism will exit the upper limit plate 1.1 lock hole, and the upper limit plate 1.1 will be unlocked. The position lever 3.2 of the circuit breaker mechanism will exit the lower limit plate 3.1 lock hole, and the lower limit plate 3.1 will be unlocked. Step 2: Open the cable compartment door. The latch assembly 10 acts on the linkage assembly through the drive spring assembly 9 to automatically lock the circuit breaker after the cable compartment door is opened. In a preferred but non-limiting embodiment of the present invention, step 2 specifically includes: Step 2.1: Open the cable compartment door. The emergency unlocking bolt 10.2 fixed on the cable compartment door drives the locking hook block 10.3 to move backward. The locking hook block 10.3 pulls the rotating buckle plate 10.4 to rotate clockwise. The rotating buckle plate 10.4 drives the third radial connecting rod 10.5 to move backward through the shaft pin. Step 2.2, during the backward movement of the third radial link 10.5, the radial link assembly is driven to move backward through the drive spring assembly 9. The torque of the radial link assembly moving backward is converted into the torque of the lateral link assembly 6 rotating axially through the torque steering knuckle assembly 4. Step 2.3, the torque of the axial rotation of the transverse link assembly 6 is converted into the torque of the longitudinal link assembly 2 moving downward through the torque steering knuckle assembly 4, and the upper limit plate 1.1 and the lower limit plate 3.1 move downward with the longitudinal link assembly 2; Step 2.4: The lower limit plate 3.1 moves down to the bending plate to lock the circuit breaker tripping latch plate 3.3, completing the automatic locking of the circuit breaker closing operation after the cable compartment door is opened; Step 3: The drive spring assembly 9 continues to act on the radial link assembly and the transverse link assembly 6, and the torque steering knuckle assembly 4 keeps the longitudinal link assembly 2 in the locked circuit breaker trip lever 3.3 state, so the circuit breaker cannot trip. Step 4: After the staff completes the inspection or maintenance, they close the cable compartment door, perform the circuit breaker tripping and release the grounding of the three-position mechanism, and the device returns to the locked state.

[0041] In a preferred but non-limiting embodiment of the present invention, step 4 specifically includes: Step 4.1: When the cable compartment door is closed, the emergency unlocking bolt 10.2 fixed on the cable compartment door drives the locking hook block 10.3 to move forward. The locking hook block 10.3 pushes the third radial connecting rod 10.5 to move forward. The third radial connecting rod 10.5 pulls the rotating buckle plate 10.4 to rotate counterclockwise until the rotating buckle plate 10.4 completely engages the locking hook block 10.3. Step 4.2, during the forward movement of the third radial link 10.5, the radial link assembly is driven forward by the drive spring assembly 9. The radial link assembly and the transverse link assembly 6 are connected by the torque steering knuckle assembly 4, which converts the torque of the radial link assembly moving forward into the torque of the transverse link 6 assembly rotating axially. Step 4.3: Drive the longitudinal linkage assembly 2 upward through the transverse linkage assembly 6 until the upper limit plate 1.1 lock hole corresponds to the position rod 1.2 of the three-position mechanism and the lower limit plate 3.1 lock hole corresponds to the position rod 3.2 of the circuit breaker mechanism. The lower limit plate 3.1 bend plate no longer locks the circuit breaker tripping lever plate 3.3. Step 4.4: Operate the circuit breaker to open, that is, the circuit breaker mechanism position rod 3.2 enters the lock hole set in the lower limit plate 3.1. Operate the three-position opening, that is, the three-position mechanism position rod 1.2 enters the lock hole set in the upper limit plate 1.1. Both the upper limit plate 1.1 and the lower limit plate 3.1 are locked, and the cable compartment door is in the locked state. At this time, the device returns to the locked state.

[0042] It is worth noting that in the embodiments of the present invention, "steps + numbers" is only an expression for clearly describing the specific implementation of the test method, and not an absolute restriction on the order of the steps. Under the guidance of the core concept of the present invention, changing the order of these steps to obtain the same or similar technical effects all fall within the scope of the present invention.

[0043] like Figure 1As shown, Embodiment 3 of the present invention provides a gas-insulated switchgear. The front end of the switchgear is provided with an upper instrument compartment 11, a mechanism compartment 12 and a lower instrument compartment 13 arranged sequentially from top to bottom. An air box 14 is arranged behind the upper instrument compartment 11 and the mechanism compartment 12. A pressure relief channel 15 is connected to the rear of the air box 14. A cable compartment 16 is arranged behind the lower instrument compartment 13. Both the lower instrument compartment 13 and the cable compartment 16 are located at the bottom of the switchgear.

[0044] The mechanism compartment 12 is equipped with a three-station mechanism and a circuit breaker mechanism. The three-station mechanism is located above the circuit breaker mechanism. The mechanical interlocking device 17 passes through the three-station mechanism, the circuit breaker mechanism, the lower instrument compartment 13 and the cable compartment 16 to realize the interlocking function. Compared with the prior art, the beneficial effects of the present invention include at least the following: 1. The device described in this invention allows the cable compartment door to be opened only when the three-position grounding is closed and the circuit breaker is closed. After the cable compartment door is opened, grounding is prohibited from being disconnected. The circuit breaker is only allowed to open after the cable compartment door is reliably closed. Furthermore, the cable compartment door can be automatically unlocked after the three-position grounding is closed and the circuit breaker is closed, without the need for secondary confirmation or operation. After the cable compartment door is closed, the circuit breaker mechanism is automatically unlocked, also without the need for secondary confirmation or operation. This simplifies the operation steps and reduces the difficulty of operation for maintenance personnel while ensuring safety.

[0045] 2. The device described in this invention adopts a mechanical hard connection to ensure the consistency of device execution. The connecting rod is fixed by a bracket assembly. The sliding ring on the bracket assembly can effectively reduce the friction between the connecting rod and the connecting rod without applying grease, thereby improving the smoothness and accuracy of the interlocking mechanism, avoiding secondary pollution caused by applying grease, and also avoiding jamming and refusal to act. This improves the reliability of the interlocking technology, ensures the safety of personnel and equipment, and overcomes the problems of complex structure, low precision, and high friction leading to deviation or jamming in traditional mechanical hard connection interlocking devices.

[0046] 3. Due to the limitations of application scenarios, traditional devices simply move in a straight line along the side of the equipment. The effective movement distance transmitted to the mechanism is limited and prone to shearing and jamming, affecting the smooth execution of the action. The transverse execution component of this invention uses a transverse connecting rod to transmit the execution torque through axial rotation, saving equipment space and realizing the silk-smooth transmission of the interlocking device. 4. By setting a drive spring assembly on the radial connecting rod, the present invention can provide sufficient torque, avoid the influence of accidental contact due to insufficient torque, and, in conjunction with multiple fixing pin holes on the connecting rod, adjust the torque as needed, thereby improving the accuracy and anti-interference of the interlocking device.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention.

Claims

1. A mechanical interlocking device for a gas-insulated switchgear, characterized in that: The device includes: a limiting assembly, a torque steering knuckle assembly (4), a connecting rod assembly, a drive spring assembly (9), and a locking assembly (10). The limiting component is fixed to the connecting rod assembly by bolts to realize the opening and closing of the three-position mechanism and the circuit breaker mechanism in the gas-insulated switch cabinet. The connecting rod assembly includes multiple sets of connecting rods for interlocking transmission of the device. The multiple sets of connecting rods are connected by a torque steering knuckle assembly (4) to realize the conversion of torque direction when opening and closing. One end of the connecting rod assembly is connected to a drive spring assembly (9). The connecting rod is driven by adjusting the torque. The other end of the drive spring assembly (9) is connected to a latch assembly (10). One end of the latch assembly (10) is fixed to the cable compartment door in the gas-insulated switch cabinet to realize forced mechanical interlocking when the cable compartment door is opened or closed. When the cable compartment door is opened, the three-position mechanism and the circuit breaker mechanism are kept in the closed state by the transmission of the connecting rod assembly.

2. The mechanical interlocking device for a gas-insulated switchgear according to claim 1, characterized in that: The limiting component includes: an upper limit component (1), which is located in the three-station mechanism and includes: an upper limit plate (1.1) and a three-station mechanism position rod (1.2). The three-station mechanism position rod (1.2) passes through the lock hole provided in the upper limit plate (1.1). The three-station mechanism position rod (1.2) moves back and forth according to the grounding and opening / closing state of the three-station mechanism, entering or exiting the lock hole of the upper limit plate (1.1) to realize the closing or opening of the three-station mechanism.

3. The mechanical interlocking device for a gas-insulated switchgear according to claim 1, characterized in that: The limiting assembly further includes a lower limiting assembly (3), which is located in the circuit breaker mechanism and includes a lower limiting plate (3.1), a circuit breaker mechanism position rod (3.2), and a circuit breaker tripping latch plate (3.3). The circuit breaker mechanism position rod (3.2) passes through the lock hole provided in the lower limiting plate (3.1). The circuit breaker mechanism position rod (3.2) can move back and forth according to the circuit breaker mechanism's open and closed state, enter or exit the lock hole of the lower limiting plate (3.1), and realize the closing or opening of the circuit breaker mechanism. The lower limiting plate (3.1) is provided with a bent plate. When the cable compartment door is opened, the bent plate enters the hole of the circuit breaker tripping latch plate (3.3) to restrict the movement of the circuit breaker tripping latch plate (3.3) so that the circuit breaker cannot trip after the cable compartment door is opened.

4. The mechanical interlocking device for a gas-insulated switchgear according to claim 1, characterized in that: The torque steering knuckle assembly (4) includes a first torque steering knuckle (4.1) and a second torque steering knuckle (4.2), which are rotatably connected to connect linkage assemblies in different directions, thereby realizing the change of torque direction and avoiding jamming during device operation due to different linkage directions.

5. A mechanical interlocking device for a gas-insulated switchgear according to claim 1, characterized in that: The linkage assembly includes: a longitudinal linkage assembly (2), a bracket assembly (5), a transverse linkage assembly (6), and a radial linkage assembly. The longitudinal linkage assembly (2) is connected to the transverse linkage assembly (6) through a torque steering knuckle assembly (4). The other end of the transverse linkage assembly (6) is connected to the radial linkage assembly through a torque steering knuckle assembly (4) to realize the change and transmission of torque direction. The transverse linkage assembly (6) and the radial linkage assembly pass through the bracket assembly (5). Multiple bracket assemblies (5) are fixed on the gas-insulated switch cabinet to fix the linkage and prevent the linkage from twisting when it is subjected to torque.

6. A mechanical interlocking device for a gas-insulated switchgear according to claim 5, characterized in that: The longitudinal linkage assembly (2) includes: a first longitudinal linkage (2.1) and a second longitudinal linkage (2.2). The first longitudinal linkage (2.1) and the second longitudinal linkage (2.2) are fixedly connected. The limiting assembly is fixed to the first longitudinal linkage (2.1) by bolts and moves up and down with the longitudinal linkage assembly (2). The height of the locking hole in the limiting assembly is adjusted by the up and down movement of the longitudinal linkage assembly (2) to realize the locking and unlocking of the three-position mechanism and the circuit breaker mechanism.

7. A mechanical interlocking device for a gas-insulated switchgear according to claim 5, characterized in that: The bracket assembly (5) is fixed on the switch cabinet and includes a bracket (5.1) and a sliding ring (5.2). The sliding ring (5.2) is nested in the mounting hole of the bracket (5.1). The sliding ring (5.2) on the bracket assembly (5) slides in contact with the transverse connecting rod assembly (6) and the radial connecting rod assembly to provide support and limit the movement, thus preventing torsion during movement.

8. A mechanical interlocking device for a gas-insulated switchgear according to claim 5, characterized in that: The transverse link assembly (6) converts the torque of the radial link assembly moving back and forth into an axial rotational torque through the torque steering knuckle assembly (4). The axial rotation of the transverse link assembly (6) drives the longitudinal link assembly (2) to move up and down, thereby realizing the transmission of the device.

9. A mechanical interlocking device for a gas-insulated switchgear according to claim 5, characterized in that: The radial link assembly includes multiple radial links, which are movably connected by axle pins and fixed through the bracket assembly (5). One end of the radial link is connected to the transverse link assembly (6) through the torque steering knuckle assembly (4), and the other end is connected to the drive spring assembly (9). The forward and backward movement of the radial link assembly drives the transverse link assembly (6) to rotate, forming an interlocking relationship.

10. A mechanical interlocking device for a gas-insulated switchgear according to claim 7, characterized in that: The drive spring assembly (9) includes a spring (9.1), a baffle (9.2), and a fixing pin (9.3). One end of the spring (9.1) is connected to the bracket assembly (5), and the other end is connected to the baffle (9.2). The other end of the baffle (9.2) is connected to the fixing pin (9.3). The fixing pin (9.3) passes through the locking assembly (10), and the torque of the spring (9.1) acts on the locking assembly (10) through the baffle (9.2).

11. A mechanical interlocking device for a gas-insulated switchgear according to claim 10, characterized in that: The locking assembly (10) includes: a rotating buckle plate bracket (10.1), an emergency unlocking bolt (10.2), a locking hook block (10.3), a rotating buckle plate (10.4), and a third radial connecting rod (10.5). The rotating buckle plate bracket (10.1) is fixed to the side plate of the cable compartment (16). One end of the rotating buckle plate (10.4) is fixed to the rotating buckle plate bracket (10.1) by a pivot pin. The locking hook block (10.3) is fixed to the cable compartment door by the emergency unlocking bolt (10.2). The locking hook block (10.3) is provided with a slot for rotating... The buckle plate (10.4) engages or disengages to open or close the cable compartment door. The other end of the rotating buckle plate (10.4) is fixed to the third radial link (10.5) by a pivot pin. The rotating buckle plate (10.4) drives the third radial link (10.5) to move back and forth with the fixed pin as the axis. The third radial link (10.5) is connected through the fixed pin (9.3) in the drive spring assembly (9). The locking hook block (10.3) moves with the cable compartment door and acts on the third radial link (10.5) and the rotating buckle plate (10.4).

12. A mechanical interlocking method for a gas-insulated switchgear, based on the mechanical interlocking device for a gas-insulated switchgear according to any one of claims 1-11, characterized in that: Includes the following steps: Operate the three-position closing mechanism and the circuit breaker closing mechanism to unlock the limit switch components; When the cable compartment door is opened, the latch assembly (10) acts on the linkage assembly through the drive spring assembly (9) to automatically lock the circuit breaker after the cable compartment door is opened; The drive spring assembly (9) continuously acts on the linkage assembly, and the circuit breaker remains in the closed state. After the staff completes the inspection or maintenance, they close the cable compartment door, perform the circuit breaker tripping and release the three-position grounding operation, and the device returns to the locked state.

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