Combined switchgear interlocking device and combined switchgear

Abstract

The application discloses a combined switch electric appliance interlocking device and a combined switch electric appliance thereof, which comprises circuit breaker shafts, disconnecting switch shafts and grounding switch shafts rotatably arranged on an inner mounting plate respectively, a first interlocking structure is connected between the disconnecting switch shafts and the circuit breaker shafts, a second interlocking structure is arranged between the disconnecting switch shafts and the grounding switch shafts, the first interlocking structure comprises a first stopper movably arranged between a first limiting disc and a second limiting disc, and the second interlocking structure comprises a second stopper movably arranged between a third limiting disc and a fourth limiting disc. The first interlocking structure and the second interlocking structure designed by the technical scheme realize the interlocking between the circuit breaker, the disconnecting switch and the grounding switch respectively, truly realize mechanical locking, ensure that the combined switch electric appliance operates according to a correct operation sequence, avoid the harm caused by misoperation, and thus meet the relevant regulations of five-prevention interlocking, and improve the safety of product use.

Description

Technical Field

[0001] This invention relates to the field of power supply and distribution technology, specifically to a combined switchgear interlocking device and the combined switchgear thereof. Background Technology

[0002] With the continuous development of the national economy, more stringent requirements have been placed on the power quality and operational reliability of power grid lines. Currently, combined switchgear is frequently used in power supply and distribution lines. Existing combined switchgear mainly consists of operating elements such as vacuum circuit breakers, disconnectors, and grounding switches, and plays a role in switching, controlling, or protecting power systems during generation, transmission, distribution, energy conversion, and consumption. Improper operation of combined switchgear during operation and maintenance can lead to serious safety accidents. Therefore, to ensure the safe operation of the power grid, protect equipment and personnel, and prevent misoperation, the power industry stipulates that high and low voltage switchgear must meet the five-prevention interlocking requirements for safe operation: preventing accidental opening or closing of circuit breakers; preventing the opening or closing of disconnectors under load; preventing accidental closing of grounding switches while energized; preventing closing circuit breakers with grounding wires connected; and preventing accidental entry into energized gaps.

[0003] According to the aforementioned five-prevention interlocking regulations, the basic requirements for combined switchgear are: when energized, the circuit breaker can only be closed after the isolating / grounding switch is fully open or closed; and when de-energized, the isolating / grounding switch can only be operated after the circuit breaker is open. In actual operation, the interlocking coordination between the circuit breaker, isolating switch, and wiring switch in the combined switchgear adopts a multi-link structure with baffles. When the circuit breaker, isolating switch, and wiring switch are opened or closed, the corresponding baffles are activated. Multiple baffles respectively block the circuit breaker operating hole, isolating operating hole, and grounding operating hole on the operating mechanism to achieve interlocking. This prevents the handle from extending out of the corresponding operating hole to operate the circuit breaker, isolating switch, or grounding switch, thus ensuring that the isolating switch cannot be accidentally operated when the circuit breaker is closed, and other interlocking requirements are met. However, this interlocking method of combined switchgear still has the following problems in practice: 1. This baffle interlocking adopts a multi-link structure transmission method, which has many components and connection points, making it difficult to balance the inertial force and requiring frequent adjustment and maintenance. The baffle is exposed outside the frame and is easily damaged, resulting in poor overall transmission reliability; 2. Although the baffle interlocking method can restrict the manual closing operation of the circuit breaker by the handle, it cannot restrict the electric closing of the circuit breaker, which poses a safety hazard of misoperation. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem that the existing combination switchgear uses a multi-link baffle to block the operating hole to achieve interlocking, which has many components and connection points, complex overall structure, and poor interlocking reliability. The present invention provides a combination switchgear interlocking device and its combination switchgear that reduces the number of connection points, has a simple overall structure, meets the relevant regulations of five-proof interlocking, and improves the safety and reliability of use.

[0005] To solve the above-mentioned technical problems, the present invention provides a combined switchgear interlocking device, including a circuit breaker shaft, a disconnecting switch shaft, and a grounding switch shaft respectively rotatably mounted on a mechanism support. A first interlocking structure is connected between the disconnecting switch shaft and the circuit breaker shaft, and a second interlocking structure is connected between the disconnecting switch shaft and the grounding switch shaft. The first interlocking structure includes a first limiting plate linked to the disconnecting switch shaft, a second limiting plate linked to the circuit breaker shaft, and a first stop member movably disposed between the first limiting plate and the second limiting plate.

[0006] The second interlocking structure includes a third limiting plate linked to the isolating switch shaft, a fourth limiting plate linked to the grounding switch shaft, and a second stop movably disposed between the third limiting plate and the fourth limiting plate;

[0007] When the disconnector switch shaft is in the open position, the first limit plate drives the first stop to form a limit engagement with the second limit plate to restrict the rotation of the circuit breaker shaft; and a free space is formed between the third limit plate and the fourth limit plate for the second stop to move.

[0008] When the disconnecting switch shaft is in the closed position, the third limiting plate drives the second stop to form a limiting engagement with the fourth limiting plate to restrict the rotation of the grounding switch shaft; and a free space is formed between the first limiting plate and the second limiting plate for the first stop to move.

[0009] The aforementioned combination switchgear interlocking device, wherein the first interlocking structure includes a first limiting component disposed between the disconnecting switch shaft and the circuit breaker shaft for guiding the first stop member to perform linear reciprocating movement;

[0010] The second interlocking structure includes a second limiting component disposed between the isolating switch shaft and the grounding switch shaft for guiding the second stop to perform linear reciprocating movement;

[0011] The moving direction of the first stop and the moving direction of the second stop intersect at the isolating switch shaft and are set at an angle.

[0012] In the aforementioned combined switchgear interlocking device, the first limiting component includes an intermediate limiting plate and a first limiting plate that are parallel to each other on the isolating switch shaft and the circuit breaker shaft, and a set of first guide holes that extend relative to each other on the first limiting plate and the intermediate limiting plate along the length direction of the first limiting plate, and a first guide shaft that is slidably connected in the first guide hole is provided on the first stop member.

[0013] In the aforementioned combined switchgear interlocking device, the first stop is a circular roller with a corresponding stop between the intermediate limiting plate and the first limiting plate. The first limiting plate has a first limiting groove on its arc-shaped convex edge that mates with the circular roller, and the second limiting plate has a second limiting groove on its arc-shaped convex edge that mates with the roller structure. When the disconnector shaft is open, the first limiting plate pushes the first stop into the second limiting groove to restrict the rotation of the circuit breaker shaft. When the disconnector shaft is closed, the first limiting plate separates from the first stop, creating a free space for the first stop to move, thereby releasing the restriction on the rotation of the circuit breaker shaft. Similarly, when the circuit breaker shaft is closed, the second limiting plate pushes the first stop into the first limiting groove to restrict the rotation of the disconnector shaft. When the circuit breaker shaft is open, the second limiting plate separates from the first stop, creating a free space for the first stop to move, thereby releasing the restriction on the rotation of the disconnector shaft.

[0014] In the aforementioned combined switchgear interlocking device, the second limiting component includes the intermediate limiting plate arranged parallel to the inner mounting plate of the housing, and a second limiting plate movably arranged between the intermediate limiting plate and the inner mounting plate along the moving direction of the second stop. Two second stop members are connected in the arc grooves at both ends of the second limiting plate. The device also includes two sets of second guide holes corresponding to the two second stop members and arranged opposite to each other on the intermediate limiting plate and the inner mounting plate, and two sets of second guide shafts respectively arranged on the two second stop members and slidably connected to the two sets of second guide holes. The two second stop members are respectively connected to the third limiting plate and the fourth limiting plate.

[0015] In the aforementioned combined switch electrical interlocking device, the second limiting plate includes two strip-shaped sliding holes extending along its length direction. Two positioning posts passing through the two strip-shaped sliding holes are connected between the intermediate limiting plate and the inner mounting plate. Two sets of second guide holes extend in the same direction as the strip-shaped sliding holes. The first limiting plate and the second limiting plate are respectively located on both sides of the intermediate limiting plate.

[0016] In the aforementioned combined switchgear interlocking device, the second limiting component includes an intermediate limiting plate and a second limiting plate that are parallel to and sleeved on the isolating switch shaft and the grounding switch shaft, and at least one set of second guide holes that are oppositely arranged on the second limiting plate and the intermediate limiting plate. The second guide holes extend a predetermined distance along the length direction of the second limiting plate. The second stop is slidably connected in the second guide hole through a second guide shaft, and multiple stops are sequentially connected between the intermediate limiting plate and the second limiting plate along the second guide hole.

[0017] In the aforementioned combined switchgear interlocking device, the second stop is a circular roller, the third limiting plate has a third limiting groove on its arc-shaped convex edge that mates with the circular roller, and the fourth limiting plate has a fourth limiting groove on its arc-shaped convex edge that mates with the roller structure. When the disconnecting switch shaft is closed, the third limiting plate pushes the second stop into the fourth limiting groove to restrict the rotation of the grounding switch shaft; and when the disconnecting switch shaft is open, it separates from the second stop and forms a free space for the second stop to move, thereby releasing the rotation restriction on the grounding switch shaft. Similarly, when the grounding switch shaft is closed, the fourth limiting plate pushes the second stop into the third limiting groove to restrict the rotation of the disconnecting switch shaft; and when the grounding switch shaft is open, it separates from the second braking element and forms a free space for the second stop to move, thereby releasing the rotation restriction on the disconnecting switch shaft.

[0018] In the aforementioned combined switchgear interlocking device, a closing half-shaft is rotatably mounted on the mechanism support for triggering the energy storage mechanism to release stored energy to drive the circuit breaker shaft to automatically close. A third interlocking structure is provided between the closing half-shaft and the disconnecting switch shaft to restrict the rotation of the closing half-shaft when the disconnecting switch shaft is open.

[0019] In the aforementioned combined switchgear interlocking device, the third interlocking structure includes:

[0020] The drive rod is linked to the shaft of the disconnect switch;

[0021] The locking hook is rotatably mounted on the mechanism bracket via a rotating shaft. It includes a trigger end extending along the rotation path of the drive rod, and a limiting end extending relative to the trigger end toward the position of the closing half shaft.

[0022] A reset spring is connected between the mechanism bracket and the locking hook, and applies an elastic force to the locking hook to drive the limiting end to rotate away from the closing half shaft.

[0023] When the disconnector switch shaft is opened, the drive rod pushes the trigger end to drive the locking hook to rotate the limit end and form a limit engagement with the closing half shaft;

[0024] When the isolating switch shaft is closed, the drive rod moves away from the trigger end, so that the locking hook, under the action of elastic force, drives the limit end to rotate and then releases the limit engagement with the closing half shaft.

[0025] In the above-mentioned combination switch electrical interlocking device, the drive rod is fixed on the disconnecting switch shaft by a fixing sleeve, and the end of the disconnecting switch shaft is provided with an isolation opening / closing indicator disk fixedly connected to the drive rod. The inner mounting plate is provided with an isolation limiting shaft and a grounding limiting shaft respectively located on the rotation path of the third limiting disk and the fourth limiting disk.

[0026] The present invention also provides a combined switchgear, including a circuit breaker, a disconnecting switch, a grounding switch and disposed on a frame, and a combined switchgear interlocking device as described above, wherein the combined switchgear interlocking device is disposed in an operating mechanism on the side of the frame.

[0027] The technical solution of this invention has the following advantages compared with the prior art:

[0028] 1. In the combined switchgear interlocking device provided by the present invention, a first interlocking structure is connected between the isolating switch shaft and the circuit breaker shaft, and a second interlocking structure is connected between the isolating switch shaft and the grounding switch shaft. When the isolating switch shaft is in the open position, it will drive the first limit plate and the third limit plate to rotate by a certain angle. The first limit plate drives the first stop to form a limit engagement with the second limit plate, so that the circuit breaker shaft cannot be closed and rotated due to the second limit plate being limited, thereby preventing the circuit breaker from accidentally closing when the isolating switch is open. At this time, the grounding switch shaft is in the unlocked state and can be freely opened and closed, ensuring that power is supplied in the order of grounding switch opening, isolating switch closing, and finally circuit breaker closing. When the isolating switch shaft is in the closed position, The third limit plate drives the second stop to form a limit engagement with the fourth limit plate, preventing the grounding switch shaft from rotating due to the fourth limit plate's blocking effect. This prevents the grounding switch from closing while energized. Meanwhile, the circuit breaker shaft is unlocked and can freely open and close, ensuring that the power is cut off according to the operating sequence of circuit breaker opening, disconnecting switch opening, and finally grounding switch closing, facilitating maintenance. The first and second interlocking structures designed in this technical solution respectively achieve interlocking between the circuit breaker, disconnecting switch, and grounding switch, truly realizing mechanical interlocking. This ensures that the combined switchgear operates according to the preset sequence, avoiding hazards caused by misoperation, thus meeting the relevant regulations for five-proof interlocking and improving the safety and reliability of the combined switchgear.

[0029] 2. In the combined switchgear interlocking device provided by the present invention, the intermediate limit plate and the first limit plate are parallelly sleeved on the disconnector switch shaft and the circuit breaker shaft. A set of first guide holes are provided opposite to each other on the first limit plate and the intermediate limit plate, allowing the first stop member to be slidably connected in the first guide holes via a first guide shaft. This structural arrangement, through the cooperation of the first guide holes and the first guide shaft, enables the first stop member to be movably installed between the first limit plate and the intermediate limit plate, while simultaneously guiding the movement of the first stop member to prevent it from moving. During the movement of the components, positional deviation occurs. To ensure that the first stop component reliably and accurately transmits movement between the first limit plate and the second limit plate, when the disconnecting switch shaft is open, the first stop component, driven by the first limit plate, can form a limit engagement with the second limit plate, thus limiting and locking the circuit breaker shaft; and when the circuit breaker shaft is closed, the first stop component, driven by the second limit plate, can form a limit engagement with the first limit plate, thus limiting and locking the disconnecting switch shaft, thereby achieving the interlocking purpose between the disconnecting switch shaft and the circuit breaker shaft.

[0030] 3. In the combined switchgear interlocking device provided by the present invention, a second limiting plate is movably positioned between the intermediate limiting plate and the inner mounting plate, and two second stop members are connected to both ends of the second limiting plate. The two second stop members are slidably connected in the second guide holes opposite to the intermediate limiting plate and the inner mounting plate through the second guide shaft. This structural arrangement guides the movement of the second stop members through the cooperation of the second guide holes and the second guide shaft, and increases the connection distance by connecting the two second stop members with the second limiting plate. This allows the two second stop members to cooperate with the third driving plate and the fourth driving plate respectively to achieve the interlocking function. When the third driving plate drives one of the second stop members to move, the other second stop member is pushed and forms a limiting cooperation with the fourth limiting plate, thereby limiting and locking the grounding switch shaft. Similarly, when the fourth driving plate drives one of the second stop members to move, the other second stop member is pushed and forms a limiting cooperation with the third limiting plate, thereby limiting and locking the isolating switch shaft, thus achieving the interlocking purpose between the isolating switch shaft and the circuit breaker shaft.

[0031] 4. In the combined switch electrical interlocking device provided by the present invention, the first stop and the second stop are both designed with circular rollers, and the first to fourth limit plates are respectively provided with arc-shaped first to fourth limit grooves. When the circular rollers are impacted by the arc-shaped convex edge of the limit plate, they will roll and displace, which helps to reduce frictional resistance and has high transmission efficiency. At the same time, they can form a limit fit with the circular rollers through the arc-shaped limit grooves.

[0032] 5. In the combined switchgear interlocking device provided by the present invention, a third interlocking structure is provided between the disconnecting switch and the closing half-shaft. When the disconnecting switch shaft is open, the driving rod pushes the trigger end of the locking hook, causing the locking hook to rotate and form a limit engagement with the closing half-shaft, thereby limiting and locking the closing half-shaft. At this time, the circuit breaker cannot be electrically closed through the closing half-shaft. Only when the disconnecting switch shaft is open, due to the separation of the driving rod and the locking hook, the locking hook is driven by the reset spring to rotate the limit end away from the closing half-shaft, thereby releasing the limit engagement between the locking hook and the closing half-shaft. At this time, after the circuit breaker has completed energy storage, it can be electrically closed through the closing half-shaft. The advantage of this structural design is that the third interlocking structure can prevent the circuit breaker from being electrically closed when the disconnecting switch is opened, and at the same time, it can prevent the circuit breaker from being manually closed when the first interlocking structure is used. This achieves the interlocking requirements between the disconnecting switch and the circuit breaker, and ensures that the relevant operations of the combined switching appliances are performed in the correct operating sequence, preventing unnecessary risks caused by misoperation, and making it safe and reliable to use.

[0033] 6. In the combined switchgear provided by this invention, the circuit breaker, disconnector, and grounding switch are interlocked through an interlocking device. During power supply operations, the grounding switch is first opened, then the disconnector is closed, and finally the circuit breaker can be opened or closed. This prevents the disconnector from being closed before the grounding switch is opened, or vice versa. In addition, during power outage or maintenance operations, the circuit breaker is first opened, then the disconnector is opened, and finally the grounding switch can be opened or closed. This process prevents the disconnector from being opened or closed under load, thus ensuring that the combined switchgear meets the safety operation requirements of the five-proof interlocking system, making it safe and reliable. Attached Figure Description

[0034] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below.

[0035] Figure 1 This is a three-dimensional structural diagram of the combined switchgear interlocking device provided by the present invention;

[0036] Figure 2 This is a schematic diagram of the combined switchgear interlocking device of the present invention when the isolating switch shaft is in the closed position;

[0037] Figure 3 This is a schematic diagram of the third interlocking structure of the present invention when the disconnecting switch shaft is closed;

[0038] Figure 4 This is a schematic diagram of the combined switchgear interlocking device of the present invention when the isolating switch shaft is in the open position;

[0039] Figure 5This is a schematic diagram of the third interlocking structure of the present invention when the disconnecting switch shaft is in the open position;

[0040] Figure 6 This is a side view of the combined switchgear interlocking device of the present invention.

[0041] Figure 7 This is a schematic diagram of the first interlocking structure of the present invention;

[0042] Figure 8 This is a schematic diagram of the second interlocking structure of the present invention;

[0043] Figure 9 A three-dimensional structural schematic diagram of the combined switching device provided by the present invention;

[0044] Figure 10 A schematic diagram of the planar structure of the combined switching device provided by the present invention;

[0045] Explanation of reference numerals in the attached drawings: 1. Circuit breaker shaft; 2. Disconnecting switch shaft; 3. Grounding switch shaft; 4. First interlocking structure; 41. First limiting plate; 411. First limiting groove; 42. Second limiting plate; 421. Second limiting groove; 43. First stop; 44. First limiting plate; 45. First guide hole; 46. First guide shaft; 5. Second interlocking structure; 51. Third limiting plate; 511. Third limiting groove; 52. Fourth limiting plate; 521. Fourth limiting groove; 53. Second stop; 54. Second limiting plate 55. Plate; 56. Second guide hole; 57. Second guide shaft; 58. Positioning post; 59. Strip-shaped sliding hole; 6. Intermediate limit plate; 70. Inner mounting plate; 71. Isolation limit shaft; 72. Grounding limit shaft; 8. Mechanism bracket; 81. Closing half shaft; 92. Third interlocking structure; 93. Locking hook; 94. Trigger end; 95. Limit end; 96. Drive rod; 97. Reset spring; 98. Isolation opening / closing indicator; 109. Circuit breaker; 100. Disconnecting switch; 101. Grounding switch; 102. Operating mechanism. Detailed Implementation

[0046] The technical solution of the present invention 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 the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention based on the specific circumstances.

[0049] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0050] Example 1

[0051] The following is a detailed description of this embodiment with reference to the accompanying drawings:

[0052] This embodiment provides, as follows: Figure 1-8 The illustrated interlocking device for a combined switchgear includes a circuit breaker shaft 1, a disconnector shaft 2, and a grounding switch shaft 3, which are rotatably mounted on a support frame 8. A first interlocking structure 4 connects the disconnector shaft 2 to the circuit breaker shaft 1, and a second interlocking structure 5 connects the disconnector shaft 2 to the grounding switch shaft 3. The combined switchgear mainly consists of a vacuum circuit breaker, a disconnector, and a grounding switch. When the circuit breaker shaft 1, disconnector shaft 2, and grounding switch shaft 3 are in the closed or open position, they respectively drive the vacuum circuit breaker, disconnector, and grounding switch to achieve closing or opening. The operation includes the following: the first interlocking structure 4 includes a first limiting plate 41 linked to the disconnector shaft 2, a second limiting plate 42 linked to the circuit breaker shaft 1, and a first stop 43 movably disposed between the first limiting plate 41 and the second limiting plate 42; the second interlocking structure 5 includes a third limiting plate 51 linked to the disconnector shaft 2, a fourth limiting plate 52 linked to the grounding switch shaft 3, and a second stop 53 movably disposed between the third limiting plate 51 and the fourth limiting plate 52.

[0053] refer to Figure 2 When the disconnector switch shaft 2 is in the open position, the first stop 43 is driven by the first limit plate 41 to form a limit engagement with the second limit plate 42 to restrict the rotation of the circuit breaker shaft 1. At this time, the circuit breaker is in the open state and cannot be closed. A free space is formed between the third limit plate 51 and the fourth limit plate 52 for the second stop 53 to move. That is, the grounding switch is not restricted by interlock and can perform opening and closing operations, which plays the role of preventing the grounding switch from being closed while energized.

[0054] refer to Figure 4When the isolating switch shaft 2 is in the closed position, the third limiting plate 51 drives the second stop 53 to form a limiting engagement with the fourth limiting plate 52 to restrict the rotation of the grounding switch shaft 3. At this time, the grounding switch is in the open state and cannot be closed. A free space is formed between the first limiting plate 41 and the second limiting plate 42, allowing the first stop 43 to move. That is, the circuit breaker is not restricted by interlocking and can perform opening and closing actions, which plays a role in preventing the circuit breaker from closing with the grounding switch on.

[0055] In the above embodiments, by connecting the disconnector shaft 2 and the circuit breaker shaft 1 with a first interlocking structure 4, and connecting the disconnector shaft 2 and the grounding switch shaft 3 with a second interlocking structure 5, when the disconnector shaft 2 is in the open position, it will drive the first limit plate 41 and the third limit plate 51 to rotate by a certain angle. The first limit plate 41 drives the first stop 43 to form a limit engagement with the second limit plate 42, so that the circuit breaker shaft 1 cannot be closed and rotated due to the second limit plate 42 being limited, thereby preventing the circuit breaker from accidentally closing when the disconnector is open. At this time, the grounding switch shaft 3 is in the unlocked state and can be freely opened and closed, ensuring that power is supplied in the order of grounding switch opening, disconnector closing, and finally circuit breaker closing. When the disconnector shaft 2 is in the closed position, The third limit plate 51 drives the second stop 53 to form a limit engagement with the fourth limit plate 52, preventing the grounding switch shaft 3 from rotating due to the fourth limit plate 52 being blocked. This prevents the grounding switch from closing while energized. Meanwhile, the circuit breaker shaft 1 is in an unlocked state and can freely open and close, ensuring that the power is cut off according to the operation sequence of circuit breaker opening, disconnecting switch opening, and finally grounding switch closing, facilitating maintenance. The first and second interlocking structures designed in this technical solution respectively realize the interlocking effect between the circuit breaker, disconnecting switch, and grounding switch, truly achieving mechanical interlocking. This ensures that the combined switchgear operates according to the preset operation sequence, avoiding the hazards caused by misoperation, thereby meeting the relevant regulations for five-proof interlocking and improving the safety and reliability of the combined switchgear.

[0056] In a further preferred configuration, the first interlocking structure 4 includes a first limiting component disposed between the disconnecting switch shaft 2 and the circuit breaker shaft 1 to guide the first stop 43 to perform linear reciprocating movement. Correspondingly, the second interlocking structure 5 includes a second limiting component disposed between the disconnecting switch shaft 2 and the grounding switch shaft 3 to guide the second stop 53 to perform linear reciprocating movement. The first limiting component and the second limiting component respectively limit and guide the movement of the first stop 43 and the second stop 53. This design ensures that the movement direction of the first stop 43 and the movement direction of the second stop 53 intersect at the disconnecting switch shaft 2 and are set at an angle.

[0057] The following is combined with Figure 2-8The specific configuration of the first and second interlocking structures is explained in detail:

[0058] The first limiting assembly includes an intermediate limiting plate 6 and a first limiting plate 44, which are parallel to and sleeved on the disconnector switch shaft 2 and the circuit breaker shaft 1, and a set of first guide holes 45 extending relative to each other along the length direction of the first limiting plate 44 on the first limiting plate 44 and the intermediate limiting plate 6, respectively. A first guide shaft 46 is provided on the first stop member 43 and slidably connected in the first guide hole 45. More preferably, the first stop member 43 is a circular roller and is provided between the intermediate limiting plate 6 and the first limiting plate 44. A first limiting element that cooperates with the circular roller is provided on the arcuate convex edge of the first limiting disc 41. The second limiting plate 42 has a second limiting groove 421 on its arc-shaped convex edge, which cooperates with the roller structure. The first limiting groove 411 and the second limiting groove 421 are arc-shaped groove structures. This structure allows the first stop 43 to be movably installed between the first limiting plate 44 and the intermediate limiting plate 6 through the cooperation of the first guide hole 45 and the first guide shaft 46. At the same time, it plays a motion guiding role for the first stop 43 to prevent the first stop 43 from shifting position during movement, and ensures that the first stop 43 reliably and accurately transmits movement between the first limiting plate 41 and the second limiting plate 42. The following describes the two locking methods of the first interlocking structure: According to the interlocking requirement that the circuit breaker cannot be accidentally closed when the disconnecting switch is opened, the first limit plate 41 pushes the first stop 43 to abut in the second limit groove 421 when the disconnecting switch shaft 2 is opened. Since the first limit plate 41 continuously presses against the first stop 43, the second limit plate 42 is limited and blocked by the first stop 43 and cannot rotate, thereby locking the circuit breaker shaft 1. Only when the disconnecting switch shaft 2 is closed will the first limit plate 41 be driven to separate from the first stop 43, thus removing the pressure acting on the first stop and leaving free space for the first stop to move. By rotating the circuit breaker shaft 1, the second limit plate 42 can be driven to push open the circular roller, thereby unlocking the circuit breaker shaft 1. Similarly, according to the interlocking requirement that the isolating switch must not be accidentally opened when the circuit breaker is closed, the second limit plate 42 pushes the first stop 43 to engage in the first limit groove 411 when the circuit breaker shaft 1 is closed, so that the first limit plate is limited and locked by the first stop and cannot rotate, thereby locking the isolating switch shaft 2 and preventing accidental opening of the isolating switch while energized. Only when the circuit breaker shaft is opened will the second limit plate 42 be driven to separate from the first stop 43, leaving free space for the first stop to move. By rotating the isolating switch shaft 2, the first limit plate 41 can be driven to push open the first stop 43, thereby unlocking the isolating switch shaft 2. This design of the first interlocking structure achieves the purpose of interlocking between the isolating switch shaft and the circuit breaker shaft.

[0059] Combination Figure 6-8 As shown, the second limiting assembly includes the intermediate limiting plate 6, which is parallel to the inner mounting plate 7 of the housing, and a second limiting plate 54, which is movably disposed between the intermediate limiting plate 6 and the inner mounting plate 7 along the moving direction of the second stop 53. Two second stops 53 are connected in the arc grooves at both ends of the second limiting plate 54. The assembly also includes two sets of second guide holes 55 corresponding to the two second stops 53, disposed opposite to each other on the intermediate limiting plate 6 and the inner mounting plate 7, and two sets of second guide shafts 56 respectively disposed on the two second stops 53 and slidably connected to the two sets of second guide holes 55. The two second stops 53 are... The third limiting plate 51 and the fourth limiting plate 52 are not connected. As a specific structural arrangement, the second limiting plate 54 includes two strip-shaped sliding holes 58 extending along its length. Two positioning posts 57, which pass through the two strip-shaped sliding holes 58 respectively, are connected between the intermediate limiting plate 6 and the inner mounting plate 7. Two sets of second guide holes 55 extend in the same direction as the strip-shaped sliding holes 58. The first limiting plate 44 and the second limiting plate 54 are respectively located on both sides of the intermediate limiting plate 6. That is, the intermediate limiting plate 6 serves as a common component of the first limiting assembly and the second limiting assembly, which optimizes the structural layout, reduces the number of installation parts, and helps to save costs. In this embodiment, both second stop members 53 are circular rollers. The third limiting plate 51 has a third limiting groove 511 on its arc-shaped convex edge that mates with the circular rollers, and the fourth limiting plate 52 has a fourth limiting groove 521 on its arc-shaped convex edge that mates with the roller structure. When these circular rollers are impacted by the arc-shaped convex edge of the limiting plate, they will roll and displace, which helps to reduce frictional resistance and improves transmission efficiency. At the same time, the arc-shaped limiting grooves can abut against the circular rollers to form a limiting fit. This structural arrangement guides the movement of the second stop members 53 between the intermediate limiting plate 6 and the inner mounting plate 7 through the cooperation of the second guide hole 55 and the second guide shaft 56. Since the distance between the isolating switch shaft and the grounding switch shaft is relatively far, the second limiting plate 54 is connected between the two second stop members 53 to increase the connection distance, so that the two second stop members 53 respectively cooperate with the third driving plate 51 and the fourth driving plate 52 to achieve the interlocking function.

[0060] The following describes the two locking methods of the second interlocking structure 5: According to the interlocking requirement that the grounding switch cannot be accidentally closed while the disconnecting switch is closed, the third limiting plate 51 pushes the two second stoppers 53 and the second limiting plate 54 to move when the disconnecting switch shaft 2 is closed, so that one of the second stoppers 53 is stuck in the fourth limiting groove 521. Since the third limiting plate 51 is constantly pressed against the two second stoppers 53, the fourth limiting plate 52 is limited and stuck by the second stoppers 53 and cannot rotate, thereby locking the grounding switch shaft 3. Only when the disconnecting switch shaft 2 is opened will the third limiting plate 51 be driven to separate from the second stoppers 53, thus removing the pressure on the second stoppers and leaving free space for the two second stoppers 53 to move. By rotating the grounding switch shaft 3, the fourth limiting plate 52 can be driven to push open the second stoppers 53, thereby unlocking the grounding switch shaft 3. Similarly, according to the interlocking requirement that the isolating switch must not be accidentally closed when the grounding switch is closed, the fourth limiting plate 52 pushes the two second stoppers 53 and the second limiting plate 54 to move when the grounding switch shaft 3 is closed. This causes one of the second stoppers 53 to abut in the first limiting groove 411, preventing the third limiting plate 51 from rotating. This locks the isolating switch shaft and prevents accidental closing of the isolating switch and circuit breaker with the grounding switch attached. Only when the grounding switch shaft 3 is open will the fourth limiting plate 52 separate from the second stopper 53, allowing free space for the second stopper to move. By rotating the isolating switch shaft 2, the third limiting plate 51 can push open the second stopper 53, thus unlocking the isolating switch shaft 2. This second interlocking structure achieves the purpose of interlocking between the isolating switch shaft and the grounding switch shaft.

[0061] As an alternative embodiment of the aforementioned second limiting component, the difference lies in that the second limiting plate 54 is fixedly connected between the disconnecting switch shaft 2 and the grounding switch shaft 3. The second limiting component includes an intermediate limiting plate 6 and a second limiting plate 54 that are parallel to and sleeved on the disconnecting switch shaft 2 and the grounding switch shaft 3, and at least one set of second guide holes 55 that are oppositely arranged on the second limiting plate 54 and the intermediate limiting plate 6. The second guide holes 55 extend a set distance along the length direction of the second limiting plate 54. The second stop member 53 is slidably connected in the second guide hole 55 through the second guide shaft 56, and a plurality of stops are sequentially connected between the intermediate limiting plate 6 and the second limiting plate 54 along the second guide hole 55. This structural arrangement uses multiple connected second stop members to meet the connection distance requirements between the third limiting plate 51 and the fourth limiting plate 52. This allows the multiple second stop members 53 to move closer to the fourth limiting plate 52 under the drive of the third limiting plate 51, forming a limiting engagement with the fourth limiting plate to lock the grounding switch shaft 3. Conversely, the multiple second stop members 53 move closer to the third limiting plate 51 under the drive of the fourth limiting plate 52, forming a limiting engagement with the fourth limiting plate 52 to lock the isolating switch shaft 2. Those skilled in the art can select the appropriate arrangement of the second limiting components based on the above description; other equivalent embodiments will not be elaborated upon here.

[0062] In this embodiment, as Figure 1 As shown, the circuit breaker needs to store energy through the energy storage mechanism in the operating mechanism before closing. The energy storage mechanism is connected to the circuit breaker shaft 1. In order to realize the electric opening and closing operation of the circuit breaker, a closing half shaft 81 is rotatably provided on the mechanism support 8 to trigger the energy storage mechanism to release the stored energy to drive the circuit breaker shaft 1 to automatically close. A third interlocking structure 9 is provided between the closing half shaft 81 and the isolating switch shaft 2 to restrict the rotation of the closing half shaft 81 when the isolating switch shaft 2 is open. The electric closing of the circuit breaker is interlocked through the third interlocking structure 9.

[0063] The following is combined with Figure 2-5 The specific configuration of the third interlocking structure is described in detail below:

[0064] The third interlocking structure 9 includes a drive rod 92, a locking hook 91, and a reset spring 93. The drive rod 92 is linked to the isolating switch shaft 2. The locking hook 91 is rotatably mounted on the mechanism bracket 8 via a rotating shaft. It includes a trigger end 911 extending along the rotation path of the drive rod 92 and a limiting end 912 extending relative to the trigger end 911 toward the position of the closing half-shaft 81. The reset spring 93 is connected between the mechanism bracket 8 and the locking hook 91 and applies an elastic force to the locking hook to drive the limiting end 912 to rotate away from the closing half-shaft 81. This structural configuration, through a third interlocking structure 9 between the disconnecting switch and the closing half-shaft 81, allows the drive rod 92 to push the trigger end 911 of the locking hook 91 when the disconnecting switch shaft 2 is open. This causes the locking hook 91 to rotate and form a limiting engagement with the closing half-shaft 81, thus locking the closing half-shaft 81. At this time, the circuit breaker cannot be electrically closed via the closing half-shaft 81. Only when the disconnecting switch shaft 2 is closed, the drive rod 92 rotates away from the trigger end 911 as the disconnecting switch shaft 2 rotates. This causes the locking hook 91, under the action of the reset spring 93, to rotate the limiting end 912 away from the closing half-shaft 81. In other words, the limiting end is not in the rotation path of the closing half-shaft, thereby releasing the limiting engagement between the locking hook 91 and the closing half-shaft 81. At this time, after completing energy storage, the circuit breaker can be electrically closed via the closing half-shaft 81. The advantage of this structural design is that the third interlocking structure 9 can prevent the circuit breaker from being electrically closed when the disconnecting switch is opened. At the same time, in conjunction with the first interlocking structure, it can prevent the circuit breaker from being manually closed, thereby fulfilling the interlocking requirements between the disconnecting switch and the circuit breaker. It also ensures that the relevant operations of the combined switching appliances are performed in the correct operating sequence, preventing unnecessary risks caused by misoperation, and making it safe and reliable to use.

[0065] like Figure 1 As shown, the drive rod 92 is mounted on the disconnector shaft 2 via a fixed sleeve. The end of the disconnector shaft 2 is provided with an isolation open / close indicator 94 fixedly connected to the drive rod 92. The isolation open / close indicator 94 is used to indicate the open and closed states of the disconnector, making it convenient for users to observe the working status of the disconnector. The inner mounting plate 7 is provided with an isolation limit shaft 71 and a grounding limit shaft 72 located on the rotation paths of the third limit disk 51 and the fourth limit disk 52, respectively. The isolation limit shaft 71 and the grounding limit shaft 72 limit the rotation angles of the third limit disk 51 and the fourth limit disk 52, respectively.

[0066] Example 2

[0067] This embodiment discloses a combined switchgear, referencing... Figure 9-10It includes a circuit breaker 101, a disconnecting switch 102, a grounding switch 103 mounted on the frame, and the combined switchgear interlocking device described in Embodiment 1. The combined switchgear interlocking device is mounted on the operating mechanism 104 on the side of the frame. The circuit breaker is a vacuum circuit breaker.

[0068] This structurally designed combined switchgear is equipped with the interlocking devices described above, and therefore naturally possesses all the advantages brought about by these interlocking devices. The circuit breaker 101, disconnector 102, and grounding switch 103 are interlocked through the first, second, and third interlocking structures. When performing power-on operations, this combined switchgear first opens the grounding switch 103, then closes the disconnector 102, and finally opens or closes the circuit breaker 101. This prevents the disconnector from closing before the grounding switch is opened, or vice versa. Furthermore, when performing power-off or maintenance operations, the circuit breaker 101 is first opened, then the disconnector 102 is opened, and finally the grounding switch 103 is opened or closed. This process prevents the disconnector from being opened or closed under load, thus ensuring that the combined switchgear meets the safety operation requirements of the five-proof interlocking system, making it safe and reliable.

[0069] 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 scope of protection of this invention.

Claims

1. A combination switchgear interlocking device, comprising a circuit breaker shaft (1), a disconnector shaft (2), and a grounding switch shaft (3) respectively rotatably mounted on a mechanism support (8), wherein a first interlocking structure (4) is connected between the disconnector shaft (2) and the circuit breaker shaft (1), and a second interlocking structure (5) is connected between the disconnector shaft (2) and the grounding switch shaft (3), characterized in that: The first interlocking structure (4) includes a first limiting plate (41) linked to the disconnecting switch shaft (2), a second limiting plate (42) linked to the circuit breaker shaft (1), and a first stop (43) movably disposed between the first limiting plate (41) and the second limiting plate (42). The second interlocking structure (5) includes a third limiting plate (51) linked to the isolating switch shaft (2), a fourth limiting plate (52) linked to the grounding switch shaft (3), and a second stop (53) movably disposed between the third limiting plate (51) and the fourth limiting plate (52). When the disconnector shaft (2) is in the open position, the first stop (43) is driven by the first limit plate (41) to form a limit engagement with the second limit plate (42) to restrict the rotation of the circuit breaker shaft (1); and a free space is formed between the third limit plate (51) and the fourth limit plate (52) for the second stop (53) to move. When the disconnecting switch shaft (2) is in the closed position, the third limiting plate (51) drives the second stop (53) to form a limiting engagement with the fourth limiting plate (52) to restrict the rotation of the grounding switch shaft (3); and a free space is formed between the first limiting plate (41) and the second limiting plate (42) for the first stop (43) to move. The first interlocking structure (4) includes a first limiting component disposed between the disconnecting switch shaft (2) and the circuit breaker shaft (1) for guiding the first stop (43) to make linear reciprocating movements; The second interlocking structure (5) includes a second limiting component disposed between the isolating switch shaft (2) and the grounding switch shaft (3) for guiding the second stop (53) to make linear reciprocating movements; The moving direction of the first stop (43) intersects the moving direction of the second stop (53) at the isolating switch shaft (2) and is set at an angle; The first limiting component includes an intermediate limiting plate (6) and a first limiting plate (44) that are sleeved parallel to each other on the disconnector switch shaft (2) and the circuit breaker shaft (1), and a set of first guide holes (45) that extend relative to each other on the first limiting plate (44) and the intermediate limiting plate (6) along the length direction of the first limiting plate (44), and a first guide shaft (46) that is slidably connected in the first guide holes (45) is provided on the first stop (43); The first stop (43) is a circular roller and is provided between the intermediate limiting plate (6) and the first limiting plate (44). The first limiting plate (41) has a first limiting groove (411) on its arc-shaped convex edge that mates with the circular roller, and the second limiting plate (42) has a second limiting groove (421) on its arc-shaped convex edge that mates with the roller structure. When the disconnecting switch shaft (2) is opened, the first limiting plate (41) pushes the first stop (43) to abut against the second limiting groove. The second limit plate (42) restricts the rotation of the circuit breaker shaft (1) and separates from the first stop (43) when the disconnecting switch shaft (2) is closed to release the rotation restriction on the circuit breaker shaft (1); the second limit plate (42) pushes the first stop (43) to abut in the first limit groove (411) when the circuit breaker shaft (1) is closed to restrict the rotation of the disconnecting switch shaft (2), and separates from the first stop (43) when the circuit breaker shaft (1) is opened to release the rotation restriction on the disconnecting switch shaft (2); The second limiting assembly includes an intermediate limiting plate (6) parallel to the inner mounting plate (7) of the housing, and a second limiting plate (54) movably disposed between the intermediate limiting plate (6) and the inner mounting plate (7) along the moving direction of the second stop (53). Two second stops (53) are connected in the arc grooves at both ends of the second limiting plate (54). It also includes two sets of second guide holes (55) corresponding to the two second stops (53) disposed opposite to each other on the intermediate limiting plate (6) and the inner mounting plate (7), and two sets of second guide shafts (56) respectively disposed on the two second stops (53) and correspondingly slidably connected in the two sets of second guide holes (55). The two second stops (53) are respectively connected to the third limiting plate (51) and the fourth limiting plate (52). The second limiting plate (54) includes two strip-shaped sliding holes (58) extending along its length direction. Two positioning posts (57) passing through the two strip-shaped sliding holes (58) are connected between the intermediate limiting plate (6) and the inner mounting plate (7). Two sets of second guide holes (55) extend in the same direction as the strip-shaped sliding holes (58). The first limiting plate (44) and the second limiting plate (54) are respectively located on both sides of the intermediate limiting plate (6). The second limiting component includes an intermediate limiting plate (6) and a second limiting plate (54) that are sleeved parallel to the isolating switch shaft (2) and the grounding switch shaft (3), and at least one set of second guide holes (55) that are disposed opposite to the second limiting plate (54) and the intermediate limiting plate (6). The second guide holes (55) extend a set distance along the length direction of the second limiting plate (54). The second stop (53) is slidably connected in the second guide hole (55) through the second guide shaft (56), and a plurality of stops are sequentially connected between the intermediate limiting plate (6) and the second limiting plate (54) along the second guide hole (55).

2. The combined switchgear interlocking device according to claim 1, characterized in that: The second stop (53) is a circular roller. The third limiting plate (51) has a third limiting groove (511) on its arc-shaped convex edge that mates with the circular roller. The fourth limiting plate (52) has a fourth limiting groove (521) on its arc-shaped convex edge that mates with the roller structure. When the disconnecting switch shaft (2) is closed, the third limiting plate (51) pushes the second stop (53) to abut in the fourth limiting groove (521) to limit the grounding switch shaft (3). The fourth limiting plate (52) pushes the second stopping member (53) to abut in the third limiting groove (511) when the grounding switch shaft (3) is closed to restrict the rotation of the disconnecting switch shaft (2), and separates from the second stopping member (53) when the grounding switch shaft (3) is opened to release the rotation restriction on the disconnecting switch shaft (3); the fourth limiting plate (52) pushes the second stopping member (53) to abut in the third limiting groove (511) when the grounding switch shaft (3) is closed to restrict the rotation of the disconnecting switch shaft (2), and separates from the second stopping member (53) when the grounding switch shaft (3) is opened to release the rotation restriction on the disconnecting switch shaft (2).

3. The combined switchgear interlocking device according to claim 1, characterized in that: The mechanism support (8) is rotatably provided with a closing half shaft (81) for triggering the energy storage mechanism to release stored energy to drive the circuit breaker shaft (1) to automatically close. A third interlocking structure (9) is provided between the closing half shaft (81) and the disconnecting switch shaft (2) to restrict the rotation of the closing half shaft (81) when the disconnecting switch shaft (2) is opened.

4. The combined switchgear interlocking device according to claim 3, characterized in that: The third interlocking structure (9) includes: The drive rod (92) is linked to the isolating switch shaft (2); The locking hook (91) is rotatably mounted on the mechanism bracket (8) via a rotating shaft. It includes a trigger end (911) extending along the rotation path of the drive rod (92) and a limiting end (912) extending relative to the trigger end (911) toward the position of the closing half shaft (81). A reset spring (93) is connected between the mechanism bracket (8) and the locking hook (91), and applies an elastic force to the locking hook (91) to drive the limiting end (912) to rotate away from the closing half shaft (81); When the disconnector switch shaft (2) is open, the drive rod (92) pushes the trigger end (911) to drive the locking hook (91) to rotate and form a limiting engagement with the closing half shaft (81); When the isolating switch shaft (2) is closed, the drive rod (92) moves away from the trigger end (911) so that the locking hook (91) rotates under the action of elastic force and then releases the limiting end (912) from the limiting engagement with the closing half shaft (81).

5. The combined switchgear interlocking device according to claim 4, characterized in that: The drive rod (92) is mounted on the disconnecting switch shaft (2) by a fixing sleeve. The end of the disconnecting switch shaft (2) is provided with an isolation opening / closing indicator (94) fixedly connected to the drive rod (92). The inner mounting plate (7) is provided with an isolation limiting shaft (71) and a grounding limiting shaft (72) located on the rotation paths of the third limiting disk (51) and the fourth limiting disk (52), respectively.

6. A combination switchgear, characterized in that: It includes a circuit breaker (101), a disconnecting switch (102), a grounding switch (103) mounted on the rack, and a combined switchgear interlocking device according to any one of claims 1-5, wherein the combined switchgear interlocking device is located in an operating mechanism (104) on the side of the rack.

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