An external locking structure for a middle-position switch cabinet valve mechanism

Abstract

The application discloses an external locking structure for a middle-mounted switch cabinet valve mechanism, which comprises an interlocking rotating plate, a lock rod coupling joint, a rotating plate shaft, an elastic member and a locking member; one end of the interlocking rotating plate abuts against a valve unlocking linkage sliding plate; one end of the lock rod coupling joint is connected with one end of the interlocking rotating plate, and the other end is connected with a first end of an interlocking rod; a second end of the interlocking rod partially extends out of a cabinet body of the switch cabinet, the part of the second end not extending out of the cabinet body is provided with the elastic member, and the part of the second end extending out of the cabinet body is provided with the locking member; the elastic member is used for providing elastic force for the movement of the interlocking rod, and the locking member is used for limiting the movement of the interlocking rod to limit the rotation of the interlocking rotating plate. The external locking structure can complete the locking operation outside the cabinet of the switch cabinet, prevents safety accidents caused by misoperation, does not need to operate in the cabinet body, is high in safety, convenient to operate, and can be widely applied to existing middle-mounted switch cabinets.

Description

Technical Field

[0001] This invention mainly relates to protective devices for switchgear, specifically to an external locking structure for the door mechanism of a centrally located switchgear. Background Technology

[0002] With rapid socio-economic development, the requirements for power supply reliability and safety are becoming increasingly stringent. When medium-voltage switchgear is under maintenance, it is essential to ensure that the valves are closed to completely cover the contact boxes and isolate personnel from live parts. To prevent accidental activation of the valve unlocking plate during maintenance, which could lead to an accident, the valve mechanism must be locked. Currently, locking operations on existing medium-voltage switchgear require entering the cabinet, which is inconvenient and prone to accidental misoperation. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an external locking structure for the door mechanism of a centrally located switchgear, which is simple in structure, safe and reliable, and easy to operate, in view of the technical problems existing in the prior art.

[0004] To solve the above-mentioned technical problems, the technical solution proposed by this invention is as follows:

[0005] An external locking structure for a centrally located switchgear door mechanism, the door mechanism comprising upper and lower door plates respectively connected to the upper and lower contact boxes of the centrally located switchgear, upper and lower door connecting plates respectively connected to the upper and lower door plates, door unlocking support plates respectively connected to the upper and lower door connecting plates, and a movable door unlocking linkage sliding plate.

[0006] The external locking structure includes a movable part, a fixed part, and an interlocking rod;

[0007] The movable part includes an interlocking rotating plate, a locking rod connector, and a rotating plate shaft;

[0008] The fixing part includes an elastic element and a locking element;

[0009] The interlocking rotating plate is fixed in the central switch cabinet by the rotating plate shaft and can rotate radially along the rotating plate shaft. One end of the interlocking rotating plate abuts against the door unlocking linkage sliding plate to restrict the movement of the door unlocking linkage sliding plate.

[0010] One end of the locking rod connector is connected to the end of the interlocking turntable away from the unlocking linkage slide plate of the valve, and the other end is connected to the first end of the interlocking rod;

[0011] The second end of the interlocking rod extends out of the cabinet of the central switchgear. The part of the second end that does not extend out of the cabinet is provided with an elastic element, and the part of the second end that extends out of the cabinet is provided with a locking element. The elastic element is used to provide elastic force for the movement of the interlocking rod, and the locking element is used to restrict the movement of the interlocking rod to restrict the rotation of the interlocking plate.

[0012] As a further improvement to the above technical solution:

[0013] The ends of the interlocking rotating plate and the locking rod connector are provided with openings, and the interlocking rotating plate and the locking rod connector are connected by a fixing member provided in the opening.

[0014] The second end of the interlocking rod extending out of the cabinet has a through hole, through which the locking element passes to lock the interlocking rod.

[0015] The external locking structure also includes a guide plate, which is fixedly connected to the middle of the interlocking rod and is used to guide the movement direction of the interlocking rod.

[0016] The external locking structure also includes a fastener, which is located at the part of the second end of the interlocking rod that does not extend out of the cabinet and is close to one end of the elastic element. The fastener is used to fix the elastic element.

[0017] The fastener is a cotter pin.

[0018] The elastic element is a compression spring, which is sleeved on the part of the second end of the interlocking rod that does not extend out of the cabinet.

[0019] The locking element is a padlock, and the upper part of the padlock passes through a through hole on the interlocking rod to lock the interlocking rod.

[0020] Compared with the prior art, the advantages of the present invention are as follows:

[0021] The external locking structure for the valve mechanism of a center-mounted switchgear provided by this invention enables locking operations to be completed outside the center-mounted switchgear through the cooperation of the movable part, the fixed part and the interlocking rod. After locking, the valve mechanism is locked and the valve cannot be opened, which can prevent safety accidents caused by misoperation. There is no need to enter the cabinet to operate. It is not only highly safe, but also convenient and quick, and can be widely used in existing center-mounted switchgear. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a current mid-mounted switchgear cabinet, including a locking mechanism.

[0023] Figure 2 This is an enlarged view of the locking structure A inside the current mid-mounted switchgear.

[0024] Figure 3A schematic diagram of the overall structure of the external locking structure for the door mechanism of a center-mounted switchgear, as described in this invention.

[0025] Figure 4 This is an enlarged view of the external locking structure B for the centrally located switchgear door mechanism of the present invention.

[0026] Figure 5 This is a top view of the external locking structure B for the centrally located switchgear door mechanism of the present invention.

[0027] Legend:

[0028] 11. Contact box; 12. Live part; 13. Valve plate; 14. Valve connecting plate; 15. Valve unlocking support plate; 16. Valve unlocking linkage slide plate; 2. Interlocking rotating plate; 3. Locking rod connector; 4. Locking rod connector; 5. Interlocking rod; 51. First end; 52. Second end; 6. Guide plate; 7. Fastener; 8. Elastic element; 9. Locking element. Detailed Implementation

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. 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.

[0030] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "horizontal", "inner", "outer", "top", "bottom", etc., which indicate orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0031] like Figure 1 and Figure 2As shown, the existing centrally located switchgear valve mechanism includes upper and lower valve plates 13 connected to the upper and lower contact boxes 11 of the centrally located switchgear, upper and lower valve connecting plates 14 connected to the upper and lower valve plates 13, upper and lower valve unlocking support plates 15 connected to the upper and lower valve connecting plates 14, and a left-right movable valve unlocking linkage slide plate 16 connected to the upper and lower valve unlocking support plates 15. Under normal conditions, due to the valve mechanism's built-in interlocking device, the upper and lower valve connecting plates 14 cannot move, the valve cannot open, and the valve mechanism completely covers the contact boxes 11, isolating personnel from the live parts 12. When the valve unlocking support plate 15 is pressed down, the valve unlocking linkage slide plate 16 slides to the right accordingly. At this time, the valve connecting plates 14 can move, the valve can open, and the live parts 12 of the contact boxes 11 are exposed. When maintenance is required, to prevent accidental pressing of the valve unlocking support plate 15 and subsequent contact with live parts 12, a locking element (such as a padlock) is typically placed inside the through hole of the upper and lower valve unlocking support plates 15, rendering the upper and lower valve connecting plate 14 immovable and thus locking the valve mechanism. It can be seen that since locking the valve mechanism requires operation within the cabinet of the centrally located switchgear, improper operation may lead to safety accidents; therefore, improvements to the above structure are necessary.

[0032] Figures 3 to 5 This embodiment uses an external locking structure for the door mechanism of a centrally located switchgear. The structure of the door mechanism is consistent with the existing structure of the centrally located switchgear door mechanism. The external locking structure includes a movable part, a fixed part, and an interlocking rod 5. The movable part includes an interlocking rotating plate 2, a locking rod connector 3, and a rotating plate shaft 4. The fixed part includes an elastic element 8 and a locking element 9. The interlocking rotating plate 2 is fixed inside the centrally located switchgear via the rotating plate shaft 4 and can rotate radially along the rotating plate shaft 4. One end of the interlocking rotating plate 2 abuts against the door unlocking linkage slide plate 16 to restrict the movement of the door. The door unlocking linkage slide plate 16 moves; one end of the locking rod connector 3 is connected to the end of the interlocking turn plate 2 away from the door unlocking linkage slide plate 16, and the other end is connected to the first end 51 of the interlocking rod 5; the second end 52 of the interlocking rod 5 extends out of the cabinet of the central switch cabinet, the part of the second end 52 that does not extend out of the cabinet is provided with an elastic element 8, and the part of the second end 52 that extends out of the cabinet is provided with a locking element 9; the elastic element 8 is used to provide elastic force for the movement of the interlocking rod 5, and the locking element 9 is used to limit the movement of the interlocking rod 5 to limit the rotation of the interlocking turn plate 2.

[0033] The principle of the external locking structure in this embodiment is as follows: When the centrally located switchgear is under maintenance, the valve mechanism is in a self-locking state, and the valve unlocking linkage slide plate 16 is in a retracted state. At this time, since the part of the interlocking rod 5 located outside the switchgear is locked by the locking member 9, the interlocking rod 5 cannot move to the left. Correspondingly, the interlocking rotating plate 2 is in a vertical state, firmly abutting against the valve unlocking linkage slide plate 16, preventing the valve unlocking linkage slide plate 16 from sliding to the right. At this time, even if the valve unlocking support plate 15 is pressed, the valve mechanism cannot be unlocked. When the locking member 9 is removed, the interlocking rod 5 can move to the left, and the interlocking rotating plate 2 can rotate left and right accordingly. When the valve mechanism unlocking support plate is pressed down, the valve unlocking linkage slide plate 16 can slide to the right. At this time, the valve mechanism is unlocked, and the valve can be opened.

[0034] It is understood that the external locking structure of this embodiment, without changing the structure of the central switch cabinet door mechanism, locks the door mechanism through the movable part located inside the cabinet, the fixed part located partially inside the cabinet and partially outside the cabinet, and the interlocking rod 5. The locking component 9, which requires manual operation for locking, is placed outside the cabinet. During maintenance, the door mechanism can be locked without opening the cabinet door, ensuring safety during operation and preventing accidental contact between the operator and the live parts 12 caused by misoperation.

[0035] In this embodiment, both the interlocking rotating plate 2 and the locking rod connector 3 have openings at their ends, and the interlocking rotating plate 2 and the locking rod connector 3 are connected by fasteners located in the openings. Specifically, the interlocking rotating plate 2 and the locking rod connector 3 can be connected by threaded fastening.

[0036] In this embodiment, the second end 52 of the interlocking rod 5, which extends out of the cabinet, has a through hole. The locking member 9 passes through the through hole to lock the interlocking rod 5. Of course, the interlocking rod 5 can also be locked by screw tightening, switch toggle, or other methods, as long as the position of the interlocking rod 5 can be fixed to prevent it from moving to the left.

[0037] In this embodiment, the external locking structure also includes a guide plate 6, which is fixedly connected to the middle of the interlocking rod 5 and is used to guide the movement direction of the interlocking rod 5. The guide plate 6 plays a role in mechanically positioning and guiding the interlocking rod 5 when it moves left and right. Specifically, the guide plate 6 can be configured as an L-shaped structure.

[0038] In this embodiment, the external locking structure further includes a fastener 7, which is located at the end of the second end of the interlocking rod 5 that does not extend beyond the cabinet and is close to one end of the elastic member 8. The fastener 7 is used to fix the elastic member 8. As a preferred embodiment, the fastener 7 is a cotter pin. Of course, the fastener 7 can also be a bolt, screw, or other common structure, as long as it can fix one end of the elastic member 8 to the interlocking rod 5.

[0039] In this embodiment, the elastic element 8 is a compression spring, which is sleeved on the part of the second end 52 of the interlocking rod 5 that does not extend out of the cabinet. One end of the compression spring is fixed to the interlocking rod 5 by a fastener 7 (cotter pin), and the other end of the compression spring abuts against the inner cabinet door of the switch cabinet. When the interlocking rod 5 is not locked, the elasticity of the compression spring drives the interlocking rod 5 to move to the left, so that the interlocking rotating plate 2 does not interfere with the left and right movement of the valve unlocking linkage slide plate 16, and the interlocking device of the valve mechanism can be unlocked freely; when the interlocking rod 5 is locked, the compression spring is fixed to both sides and cannot move, the interlocking rotating plate 2 is in a vertical state and firmly abuts against the valve unlocking linkage slide plate 16, so that the valve unlocking linkage slide plate 16 cannot move to the right to unlock the valve mechanism. At this time, even if the valve unlocking support plate 15 is pressed, the valve mechanism cannot be unlocked, ensuring that no safety accident will occur due to accidental pressing of the valve unlocking support plate 15 during maintenance.

[0040] In this embodiment, the locking element 9 is a padlock, with the upper part of the padlock passing through the through hole on the interlocking rod 5 to lock the interlocking rod 5. Of course, the locking element 9 can also be a pin, nut, or other structures that can achieve the locking function through manual operation, as long as the reliability of the locking is ensured.

[0041] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should be considered within the scope of protection of the present invention.

Claims

1. An external locking structure for a centrally located switchgear door mechanism, the door mechanism comprising upper and lower door plates (13) respectively connected to the upper and lower contact boxes (11) of the centrally located switchgear, upper and lower door connecting plates (14) respectively connected to the upper and lower door plates (13), door unlocking support plates (15) respectively connected to the upper and lower door connecting plates (14), and a movable door unlocking linkage slide plate (16), characterized in that: The external locking structure includes a movable part, a fixed part, and an interlocking rod (5). The movable part includes an interlocking rotating plate (2), a locking rod connector (3), and a rotating plate shaft (4). The fixing part includes an elastic element (8) and a locking element (9); The interlocking rotating plate (2) is fixed in the central switch cabinet by the rotating plate shaft (4) and can rotate radially along the rotating plate shaft (4). One end of the interlocking rotating plate (2) abuts against the door unlocking linkage slide plate (16) to restrict the movement of the door unlocking linkage slide plate (16). One end of the locking rod connector (3) is connected to the end of the interlocking turn plate (2) away from the door unlocking linkage slide plate (16), and the other end is connected to the first end (51) of the interlocking rod (5); The second end (52) of the interlocking rod (5) extends out of the cabinet of the central switch cabinet. The part of the second end (52) that does not extend out of the cabinet is provided with an elastic element (8), and the part of the second end (52) that extends out of the cabinet is provided with a locking element (9). The elastic element (8) is used to provide elastic force for the movement of the interlocking rod (5), and the locking element (9) is used to limit the movement of the interlocking rod (5) to limit the rotation of the interlocking turntable (2). The ends of the interlocking rotating plate (2) and the locking rod connector (3) are provided with openings, and the interlocking rotating plate (2) and the locking rod connector (3) are connected by a fixing member provided in the opening; The second end (52) of the interlocking rod (5) has a through hole extending out of the cabinet, and the locking member (9) passes through the through hole to lock the interlocking rod (5).

2. The external locking structure for the door mechanism of a centrally located switchgear according to claim 1, characterized in that: The external locking structure also includes a guide plate (6), which is fixedly connected to the middle of the interlocking rod (5) to guide the movement direction of the interlocking rod (5).

3. The external locking structure for the door mechanism of a centrally located switchgear according to claim 1, characterized in that: The external locking structure also includes a fastener (7), which is located at the part of the second end (52) of the interlocking rod (5) that does not extend out of the cabinet and is close to one end of the elastic member (8). The fastener (7) is used to fix the elastic member (8).

4. The external locking structure for the door mechanism of a centrally located switchgear according to claim 3, characterized in that: The fastener (7) is a cotter pin.

5. The external locking structure for the door mechanism of a centrally located switchgear according to any one of claims 1-4, characterized in that: The elastic element (8) is a compression spring, which is sleeved on the part of the second end (52) of the interlocking rod (5) that does not extend out of the cabinet.

6. The external locking structure for the door mechanism of a centrally located switchgear according to any one of claims 1-4, characterized in that: The locking element (9) is a padlock, and the upper part of the padlock passes through the through hole on the interlocking rod (5) to lock the interlocking rod (5).

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