Cable chamber door interlock mechanism for gas-insulated switchgear

Abstract

The utility model relates to a kind of cable chamber door interlocking mechanism for gas-filled cabinet, including baffle assembly, it is set three-position mechanism one side, its one end is connected with the output shaft of three-position mechanism, its other end is matched with guide rod;Guide rod, its upper end is matched with baffle assembly, its lower end is connected with the door lock component in cable chamber, first limit plate is matched with the opening plate of circuit breaker mechanism, second limit plate is matched with the main shaft crank of circuit breaker mechanism;Door lock component, the door lock component is suitable for locking and unlocking to cable chamber door;When three-position mechanism is at ground connection, circuit breaker mechanism is at closing, the guide rod can be moved to upper position, and drive door lock component to unlock cable chamber door;When guide rod moves to upper position, the first limit plate blocks the opening plate and does opening rotation. Adopt mechanical interlocking structure, improve the reliability between three-position switch and cable chamber door, provide safety guarantee for gas-filled cabinet operation maintenance, reduce the probability of accident due to misoperation.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a cable compartment door interlocking mechanism for a gas-insulated switchgear. Background Technology

[0002] The three-position switch is an important component in the gas-insulated switchgear. It is a mechanical device that can operate to switch the working positions of the three-position switch. It includes three working position states: closed, isolated, and grounded. The positions have mechanical interlocking performance to prevent the grounding switch from being closed while the main circuit of the equipment is energized, thus avoiding the possibility of misoperation.

[0003] Under normal operating conditions, the cable compartment door of the gas-insulated switchgear is closed, and the primary main circuit is energized. The cable compartment door cannot be opened from the outside. For maintenance, the circuit breaker should first be tripped, the three-position switch operated to the grounded position, the circuit breaker closed, and the interlocking device released before the cable compartment door can be opened. Upon completion of maintenance, the cable compartment door must be closed before tripping the circuit breaker, operating the three-position switch to the closed position, and then closing the circuit breaker to energize the primary main circuit. The cable compartment door can only be opened and closed when the three-position switch is in the grounded position and the circuit breaker is in the closed position.

[0004] Due to the small size, compact structure, and modular components of gas-insulated switchgear, the interlocking structure is often difficult to implement or complex. Currently, most gas-insulated switchgear on the market is relatively small in size, and electrical interlocking methods are mostly used instead.

[0005] Electrical interlocking is a commonly used interlocking method in gas-filled switchgear due to its simple structure and convenient installation. It involves installing an electromagnetic lock device on the cable compartment door, which forms a reverse electrical interlocking circuit with the live indicator (the live indicator sends a signal through the primary circuit). When the primary circuit is de-energized, the electromagnetic lock will be energized by the secondary control power supply and will engage the lock cylinder, allowing the cable compartment door to open. When the primary circuit is energized, the electromagnetic lock will be de-energized and lose its attraction, preventing the cable compartment door from opening. However, this method has a low safety factor, and the components are prone to damage.

[0006] Electrical interlocking uses a capacitive sensor on the inlet bushing side of the gas-insulated switchgear to obtain an electrical signal as the interlocking condition, which then powers the electromagnetic actuator to lock the cable compartment door. The reliability of electrical interlocking depends on various factors, including the electromagnetic lock and the acquisition of the electrical signal. Insufficient control over human error poses certain safety hazards and cannot fully guarantee the safety of equipment operation and maintenance, threatening the lives of maintenance personnel and causing serious property damage. The absence or malfunction of the interlocking device can lead to operators accidentally opening the cable compartment door while the equipment is energized, causing accidents that threaten the personal safety of operators and result in serious property damage. Utility Model Content

[0007] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a cable compartment door interlocking mechanism for gas-filled switchgear, thereby solving the technical problem of low reliability of the electrical interlock between the existing three-position switch and the cable compartment door.

[0008] The technical solution adopted by this utility model to solve its technical problem is:

[0009] A cable compartment door interlocking mechanism for a gas-insulated switchgear is provided, including:

[0010] The baffle assembly is located on one side of the three-station mechanism, with one end connected to the output shaft of the three-station mechanism and the other end cooperating with the guide rod;

[0011] The guide rod can move up and down and has a downward elastic restoring force. Its upper end cooperates with the baffle assembly, and its lower end is connected to the door lock assembly in the cable room. The guide rod is provided with a first limiting plate and a second limiting plate. The first limiting plate cooperates with the opening plate of the circuit breaker mechanism, and the second limiting plate cooperates with the main shaft crank arm of the circuit breaker mechanism.

[0012] A door lock assembly adapted to lock and unlock a cable compartment door;

[0013] When the three-station mechanism is in the grounding closed position, the baffle assembly releases the restriction on the guide rod, allowing the guide rod to move to the upper position. When the three-station mechanism is in the isolation closed or isolation open position, the baffle assembly blocks the guide rod, preventing it from moving to the upper position.

[0014] When the circuit breaker mechanism is in the closed position, the main shaft crank arm is driven to release the restriction on the second limit plate, at which time the guide rod can move to the upper position; when the circuit breaker mechanism is in the open position, the main shaft crank arm is driven to block the second limit plate, preventing the guide rod from moving to the upper position;

[0015] When the three-position mechanism is in the grounding closed position and the circuit breaker mechanism is in the closed position, the guide rod can be moved to the upper position and drive the door lock assembly to unlock the cable compartment door; when the guide rod is moved to the upper position, the first limit plate blocks the opening plate from rotating to open, preventing misoperation during maintenance.

[0016] Furthermore, the door lock assembly includes

[0017] The mounting bracket is located inside the cable compartment;

[0018] A locking shaft is mounted on a mounting bracket and is rotatable in the front and back direction. The rear end of the locking shaft is connected to the lower end of the guide rod via a connecting rod assembly, and a door lock plate is provided at its front end.

[0019] A mounting plate is fixed to the inside of the cable compartment door, and a lock hole is provided on the mounting plate for inserting a door lock plate;

[0020] When the cable compartment door is closed and the guide rod falls downward, the guide rod drives the door lock plate to rotate into the lock hole of the hanging plate via the connecting rod assembly, so as to lock the cable compartment door.

[0021] Furthermore, the mounting bracket is provided with a limiting slide plate, which can move back and forth and has a forward elastic restoring force;

[0022] A limit locking plate is fixed to the front end of the locking shaft;

[0023] Top rod, which is fixed inside the cable compartment door;

[0024] When the limiting slide is in the front position, the limiting slide abuts against the limiting lock plate, thereby restricting the rotation of the locking shaft. When the limiting slide is pushed to the rear position by the push rod, the limiting slide disengages from the limiting lock plate, and at this time the locking shaft rotates as the guide rod moves upward.

[0025] Furthermore, the linkage assembly includes

[0026] The first link has one end connected to the rear end of the locking shaft and the other end hinged to the second link;

[0027] The second link has one end hinged to the U-shaped piece and the other end hinged to the first link;

[0028] The U-shaped piece has its lower end hinged to the second connecting rod and its upper end connected to the guide rod.

[0029] Furthermore, the baffle assembly includes

[0030] The first baffle is set to move left and right behind the three-station mechanism. One end of it is connected to the output shaft of the three-station mechanism via a crank arm, and the other end cooperates with the second baffle.

[0031] The second baffle is set to rotate back and forth on one side of the three-station mechanism. Its rear end cooperates with the first baffle, and its front end cooperates with the third baffle.

[0032] The third baffle has its lower end fixedly connected to the upper end of the guide rod, and its upper end cooperates with the second baffle.

[0033] When the three-station mechanism is in the isolation close or isolation open position, the first baffle is extended through the output shaft and crank arm, and the second baffle restricts the first baffle and guide rod from moving to the upper position;

[0034] When the three-position mechanism is in the grounding position, the first baffle is retracted via the output shaft and crank arm, and the second baffle is unlocked, so that the first baffle and guide rod can be moved to the upper position.

[0035] Furthermore, a lever is provided on the third baffle.

[0036] The beneficial effects of this utility model are:

[0037] The cable compartment door interlocking mechanism for the gas-filled switchgear of this utility model adopts a mechanical interlocking structure, which improves the reliability between the three-position switch and the cable compartment door, provides safety assurance for the operation and maintenance of the gas-filled switchgear, and reduces the probability of accidents caused by misoperation.

[0038] It has a simple structure, reliable performance, strong versatility, and is easy to install. Attached Figure Description

[0039] The present invention will be further described below with reference to the accompanying drawings.

[0040] Figure 1 and Figure 2 This is a schematic diagram of an air-filled cabinet;

[0041] Figure 3 This is a schematic diagram of the cable compartment door interlocking mechanism;

[0042] Figure 4 and Figure 5 This is a schematic diagram of the door lock components;

[0043] in,

[0044] 1. Guide rod; 11. First limiting plate; 12. Second limiting plate;

[0045] 2. Three-station mechanism;

[0046] 3. Baffle assembly; 31. First baffle; 32. Second baffle; 33. Third baffle; 34. Lever;

[0047] 4. Cable compartment door;

[0048] 5. Door lock assembly; 51. Mounting bracket; 52. Lock shaft; 53. Door lock plate; 54. Hanging plate; 55. Fixing plate; 56. Limiting slide plate; 57. Top rod; 58. Second tension spring; 59. Limiting lock plate.

[0049] 6. Linkage assembly; 61. First link; 62. Second link; 63. U-shaped component;

[0050] 71. Gate valve; 72. Main shaft crank arm. Detailed Implementation

[0051] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0052] This application provides a four-interlock mechanism for the cable compartment door of a gas-insulated switchgear, which will be described in detail below. It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the descriptions of each embodiment have their own emphasis; parts not described in detail in a certain embodiment can be referred to in the relevant descriptions of other embodiments.

[0053] To address the technical problem of low reliability in the electrical interlock between the three-position switch and the cable compartment door 4 in the prior art, one embodiment of this application provides an interlocking mechanism for the cable compartment door 4 of a gas-insulated switchgear. This is described in detail below.

[0054] like Figures 1 to 5 As shown, a four-interlock mechanism for the cable compartment door of a gas-insulated switchgear includes...

[0055] The baffle assembly 3 is located on one side of the three-station mechanism 2, with one end connected to the output shaft of the three-station mechanism 2 and the other end cooperating with the guide rod 1;

[0056] The guide rod 1 is movable up and down and has a downward elastic restoring force. Its upper end cooperates with the baffle assembly 3 and its lower end is connected to the door lock assembly 5 in the cable room. The guide rod 1 is provided with a first limiting plate 11 and a second limiting plate 12. The first limiting plate 11 cooperates with the opening plate 71 of the circuit breaker mechanism and the second limiting plate 12 cooperates with the main shaft crank arm 72 of the circuit breaker mechanism.

[0057] Door lock assembly 5, which is adapted to lock and unlock the cable compartment door 4;

[0058] When the three-station mechanism 2 is in the grounding closed position, it drives the baffle assembly 3 to release the restriction on the guide rod 1, at which time the guide rod 1 can move to the upper position; when the three-station mechanism 2 is in the isolation closed or isolation open (i.e., grounding open) position, it drives the baffle assembly 3 to block the guide rod 1, preventing the guide rod 1 from moving to the upper position.

[0059] When the circuit breaker mechanism is in the closed position, the main shaft crank arm 72 is driven to release the restriction on the second limit plate 12, at which time the guide rod 1 can be moved to the upper position; when the circuit breaker mechanism is in the open position, the main shaft crank arm 72 is driven to block the second limit plate 12, preventing the guide rod 1 from moving to the upper position.

[0060] When the three-position mechanism 2 is in the grounding closed position and the circuit breaker mechanism is in the closed position, the guide rod 1 can be moved to the upper position and drive the door lock assembly 5 to unlock the cable compartment door 4; when the guide rod 1 is moved to the upper position, the first limit plate 11 blocks the opening plate 71 from opening rotation to prevent misoperation during maintenance.

[0061] In this embodiment, the guide rod 1 is connected to the first tension spring, and the guide rod 1 is kept in a downward elastic reset by the first tension spring.

[0062] Specifically, as an optional implementation method in this embodiment, such as Figure 4 and Figure 5 As shown, the door lock assembly 5 includes

[0063] Mounting bracket 51 is installed in the cable compartment;

[0064] A locking shaft 52 is mounted on a mounting bracket 51 and is rotatable in the front and back direction. The rear end of the locking shaft 52 is connected to the lower end of the guide rod 1 via a connecting rod assembly 6, and a door lock plate 53 is provided at its front end.

[0065] A mounting plate 54 is fixed to the inside of the cable compartment door 4, and a lock hole is provided on the mounting plate 54 for the door lock plate 53 to be inserted.

[0066] like Figure 4 As shown, when the cable compartment door 4 is closed and the guide rod 1 falls downward, the guide rod 1 drives the door lock plate 53 to rotate into the lock hole of the hanging plate 54 via the connecting rod assembly 6, so as to lock the cable compartment door 4.

[0067] In this embodiment, the mounting bracket 51 is a U-shaped structure, which is fixed to the top of the cable room.

[0068] Specifically, as an optional implementation method in this embodiment, such as Figure 4 and Figure 5 As shown, a limiting slide plate 56 is provided on the mounting bracket 51. The limiting slide plate 56 can move back and forth and has a forward elastic restoring force.

[0069] The limiting locking plate 59 is fixed to the front end of the locking shaft 52;

[0070] Top rod 57, which is fixed inside the cable compartment door 4;

[0071] When the limiting slide plate 56 is in the front position, the limiting slide plate 56 abuts against the limiting locking plate 59, thereby restricting the locking shaft 52 from rotating. When the limiting slide plate 56 is pushed to the rear position by the push rod 57, the limiting slide plate 56 disengages from the limiting locking plate 59. At this time, the locking shaft 52 rotates as the guide rod 1 moves upward.

[0072] In this embodiment, a second tension spring 58 is provided between the front end of the limiting slide plate 56 and the mounting bracket 51, and the second tension spring 58 pulls the limiting slide plate 56 forward.

[0073] One end of the top rod 57 is fixedly connected to the cable compartment door 4, and the other end is adapted to pass through the door frame and the mounting bracket 51, thereby abutting against the limiting slide plate 56.

[0074] In this embodiment, the door lock plate 53 is fixed to the lock shaft 52 with screws.

[0075] The mounting structure of the limiting slide plate 56 on the mounting bracket 51 is as follows: a fixing plate 55 is provided on the mounting bracket 51, see [link / reference] Figure 4 and Figure 5 As shown, the fixing plate 55 is a U-shaped structure inverted inside the mounting bracket 51. Then, two screws are provided on the fixing plate 55 at the front and back. The limiting slide plate 56 has two long slots at the front and back. The screws pass through the long slots, and the limiting slide plate 56 moves back and forth on the fixing plate 55 through these two screws.

[0076] Specifically, as an optional implementation method in this embodiment, such as Figure 4 and Figure 5 As shown, the linkage assembly 6 includes

[0077] The first link 61 has one end connected to the rear end of the locking shaft 52, and the other end hinged to the second link 62;

[0078] The second link 62 has one end hinged to the U-shaped piece 63 and the other end hinged to the first link 61;

[0079] The lower end of the U-shaped part 63 is hinged to the second connecting rod 62, and the upper end is connected to the guide rod 1.

[0080] When the guide rod 1 moves upward, it pulls the first link 61, the second link 62, and the U-shaped piece 63, thereby causing the locking shaft 52 to rotate in the unlocking direction. When the guide rod 1 moves downward, it pushes the U-shaped piece 63, the first link 61, and the second link 62, thereby causing the locking shaft 52 to rotate in the locking direction.

[0081] Specifically, as an optional implementation method in this embodiment, such as Figure 3 As shown, the baffle assembly 3 includes

[0082] The first baffle 31 is set to move left and right on the rear side of the three-station mechanism 2. One end of it is connected to the output shaft of the three-station mechanism 2 via a crank arm, and the other end of it is engaged with the second baffle 32.

[0083] The second baffle 32 is set to rotate back and forth on one side of the three-station mechanism 2. Its rear end cooperates with the first baffle 31, and its front end cooperates with the third baffle 33.

[0084] The lower end of the third baffle 33 is fixedly connected to the upper end of the guide rod 1, and its upper end is engaged with the second baffle 32.

[0085] When the three-station mechanism 2 is in the isolation close or isolation open position, the first baffle 31 is extended through the output shaft and the crank arm, and the second baffle 32 restricts the first baffle 31 and the guide rod 1 to move to the upper position.

[0086] When the three-station mechanism 2 is in the grounding position, the first baffle 31 is retracted via the output shaft and crank arm, and the second baffle 32 is unlocked, so that the first baffle 31 and the guide rod 1 can be moved to the upper position.

[0087] Specifically, as an optional implementation method in this embodiment, such as Figure 3 As shown, a lever 34 is provided on the third baffle 33. The operator can easily raise the guide rod 1 upwards using the lever 34.

[0088] The opening plate 71 and the main shaft crank arm 72 are basic components of the circuit breaker mechanism. The main shaft crank arm 72 is installed on the main shaft of the circuit breaker mechanism, and the opening plate 71 is fixed on the opening half shaft of the circuit breaker mechanism.

[0089] The three-station mechanism 2 has an isolation combined station, an isolation separated station, a grounded combined station, and a grounded separated station. Since the isolation separated station and the grounded separated station are in the same position, it is referred to as a three-station mechanism.

[0090] The following details the working process in a specific application:

[0091] When the three-station mechanism 2 is in the isolation position, the main shaft drives the first baffle 31 to extend via the crank arm. The first baffle 31 blocks the second baffle 32, thereby restricting the second baffle 32 from rotating. The second baffle 32 restricts the first baffle 31 and the guide rod 1 from moving upward. The guide rod 1 cannot move upward, which means it cannot drive the locking shaft 52 to rotate. At this time, the cable compartment door 4 cannot be opened.

[0092] When the three-position mechanism 2 is in the isolation position, the first baffle 31 remains extended, restricting the guide rod 1 from moving upward. At this time, the circuit breaker mechanism trips, causing the main shaft crank arm 72 to rotate to the downward position. At this time, the main shaft crank arm 72 blocks the second limit plate 12. At this time, the guide rod 1 simultaneously blocks the third baffle 33 and the main shaft crank arm 72, making it impossible to lift up and drive the locking shaft 52 to rotate. At this time, the cable compartment door 4 still cannot be opened.

[0093] When the three-position mechanism 2 is in the grounding closed state, the main shaft retracts the first baffle 31 via the crank arm. At this time, the second baffle 33 is released from its restriction and can rotate. The circuit breaker closes, and the main shaft crank arm 72 rotates forward to a horizontal position, releasing its restriction on the second limit plate 12. The guide rod 1 can then move upwards. The guide rod 1, via the connecting rod assembly 6, drives the locking shaft 52 to rotate, causing the door lock plate 53 to move out of the lock hole of the hanging plate 54. At this time, the cable compartment door 4 can be opened. Figure 5 As shown.

[0094] As the cable compartment door 4 is opened, the top rod 57 moves away from the limiting slide plate 56. Under the action of the second tension spring 58, the limiting slide plate 56 returns to its original position and presses against the limiting lock plate 59, thereby restricting the lock shaft 52 from rotating, that is, restricting the guide rod 1 from moving downward, and ensuring that the guide rod 1 is in the upper position.

[0095] When the guide rod 1 is in the upper position, the first limit plate 11 just blocks the opening plate 71 from rotating, preventing the circuit breaker from closing when the cable compartment door 4 is open, and preventing misoperation during maintenance.

[0096] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A cable compartment door interlocking mechanism for a gas-insulated switchgear, characterized in that, include The baffle assembly is located on one side of the three-station mechanism, with one end connected to the output shaft of the three-station mechanism and the other end cooperating with the guide rod; The guide rod can move up and down and has a downward elastic restoring force. Its upper end cooperates with the baffle assembly, and its lower end is connected to the door lock assembly in the cable room. The guide rod is provided with a first limiting plate and a second limiting plate. The first limiting plate cooperates with the opening plate of the circuit breaker mechanism, and the second limiting plate cooperates with the main shaft crank arm of the circuit breaker mechanism. A door lock assembly adapted to lock and unlock a cable compartment door; When the three-station mechanism is in the grounding closed position, the baffle assembly releases the restriction on the guide rod, allowing the guide rod to move to the upper position. When the three-station mechanism is in the isolation closed or isolation open position, the baffle assembly blocks the guide rod, preventing it from moving to the upper position. When the circuit breaker mechanism is in the closed position, the main shaft crank arm is driven to release the restriction on the second limit plate, at which time the guide rod can move to the upper position; when the circuit breaker mechanism is in the open position, the main shaft crank arm is driven to block the second limit plate, preventing the guide rod from moving to the upper position; When the three-position mechanism is in the grounding closed position and the circuit breaker mechanism is in the closed position, the guide rod can be moved to the upper position and drive the door lock assembly to unlock the cable compartment door; when the guide rod is moved to the upper position, the first limit plate blocks the opening plate from rotating to open, so as to prevent misoperation during maintenance.

2. The cable compartment door interlocking mechanism for a gas-insulated switchgear according to claim 1, characterized in that, The door lock assembly includes The mounting bracket is located inside the cable compartment; A locking shaft is mounted on a mounting bracket and is rotatable in the front and back direction. The rear end of the locking shaft is connected to the lower end of the guide rod via a connecting rod assembly, and a door lock plate is provided at its front end. A mounting plate is fixed to the inside of the cable compartment door, and a lock hole is provided on the mounting plate for inserting a door lock plate; When the cable compartment door is closed and the guide rod falls downward, the guide rod drives the door lock plate to rotate into the lock hole of the hanging plate via the connecting rod assembly, so as to lock the cable compartment door.

3. The cable compartment door interlocking mechanism for a gas-insulated switchgear according to claim 2, characterized in that, The mounting bracket is equipped with a limiting slide plate, which can move back and forth and has a forward elastic restoring force; A limit locking plate is fixed to the front end of the locking shaft; Top rod, which is fixed inside the cable compartment door; When the limiting slide is in the front position, the limiting slide abuts against the limiting lock plate, thereby restricting the rotation of the locking shaft. When the limiting slide is pushed to the rear position by the push rod, the limiting slide disengages from the limiting lock plate, and at this time the locking shaft rotates as the guide rod moves upward.

4. The cable compartment door interlocking mechanism for a gas-insulated switchgear according to claim 2, characterized in that, The linkage assembly includes The first link has one end connected to the rear end of the locking shaft and the other end hinged to the second link; The second link has one end hinged to the U-shaped piece and the other end hinged to the first link; The U-shaped piece has its lower end hinged to the second connecting rod and its upper end connected to the guide rod.

5. The cable compartment door interlocking mechanism for a gas-insulated switchgear according to claim 1, characterized in that, The baffle assembly includes The first baffle is set to move left and right behind the three-station mechanism. One end of it is connected to the output shaft of the three-station mechanism via a crank arm, and the other end cooperates with the second baffle. The second baffle is set to rotate back and forth on one side of the three-station mechanism. Its rear end cooperates with the first baffle, and its front end cooperates with the third baffle. The third baffle is fixedly connected at its lower end to the upper end of the guide rod, and its upper end cooperates with the second baffle. When the three-station mechanism is in the isolation close or isolation open position, the first baffle is extended through the output shaft and crank arm, and the second baffle restricts the first baffle and guide rod from moving to the upper position; When the three-position mechanism is in the grounding position, the first baffle is retracted via the output shaft and crank arm, and the second baffle is unlocked, so that the first baffle and guide rod can be moved to the upper position.

6. The cable compartment door interlocking mechanism for a gas-insulated switchgear according to claim 5, characterized in that, A lever is provided on the third baffle.

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