One-key sequential control centrally installed switchgear
By setting a radial constraint frame and cam at the opening and closing spring of the grounding switch, the problem of spring buckling and instability under dynamic impact is solved, ensuring the reliability of the equipment and the stability of the system, and reducing maintenance requirements.
Patent Information
- Application Number
- CN202620015783.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-08
- Publication Date
- 2026-02-10
- Estimated Expiration
- 2036-01-08
AI Technical Summary
In one-key sequential control mode, the opening and closing springs are prone to buckling instability or tripping under dynamic impact conditions, and are difficult to directly observe and prevent in closed operation mode, affecting equipment safety and system stability.
A radial constraint frame is installed at the opening and closing spring of the grounding switch, and it cooperates with the first cam on the main shaft. When the switch is opened, the radial constraint frame is pressed against the inner wall of the cabinet to form a radial constraint and prevent the spring from buckling and jumping out.
It effectively prevents spring buckling and tripping, extends service life, improves the reliability of the grounding switch and the continuity and stability of the one-button sequential control system, and reduces maintenance requirements.
Smart Images
Figure CN223898209U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a switchgear cabinet technical field especially relates to a one-key sequence control middle cabinet. BACKGROUND
[0002] With the continuous advancement of smart grid construction, the operation mode of the middle switch cabinet is gradually upgraded from the traditional local manual operation to the remote one-key sequence control intelligent. The one-key sequence control technology automatically completes the operation of the circuit breaker, disconnecting switch, grounding knife switch and other devices in the switch cabinet through the preset program, significantly improves the operation efficiency, eliminates the risk of human error operation, and meets the development needs of unattended substation. As one of the key locking elements, the reliable opening and closing of the grounding knife switch is the basis for ensuring the safety of equipment maintenance and the correct execution of the program sequence control logic.
[0003] However, in the one-key sequence control mode, the cabinet body is often in a closed state, and the operator executes the instruction remotely or outside the cabinet, which is difficult to directly monitor the internal mechanical parts, especially the working state of each operating mechanism of the grounding knife switch. The mechanism generally adopts spring over dead point design to realize self-holding after the opening and closing of the mechanism. The opening and closing spring needs to go through a high-speed compression or energy release process at the end of the action. Under this dynamic and impact working condition, especially when the spring end moves over the dead point with the cam, the spring has a high risk of buckling instability due to the high aspect ratio and sudden force change, which may cause the spring to bend laterally or even jump out of the installation position. This potential mechanical instability problem is hidden, and once it occurs, it will directly cause the grounding knife switch to refuse to operate or the position indication to be abnormal, which not only threatens the safety of maintenance, but also causes the automatic program of the one-key sequence control to be interrupted, forcing the operation and maintenance personnel to interrupt the remote monitoring and carry out on-site troubleshooting and maintenance, which is contrary to the core goal of improving the automation level and reducing the operation intensity of the one-key sequence control technology. SUMMARY
[0004] Therefore, the utility model aims at providing a one-key sequence control middle cabinet to solve the problem that the opening and closing spring is prone to buckling instability or even jumping out of the installation position under the dynamic impact working condition of automatic opening and closing, and the hidden danger is difficult to be directly observed and prevented under the closed operation mode of remote one-key sequence control, thereby restricting the overall reliability and long-term maintenance-free nature of the system.
[0005] To achieve the above purpose, the utility model provides a one-key sequence control middle cabinet, which comprises a cabinet body, a grounding knife switch arranged in the cabinet body, and the grounding knife switch comprises:
[0006] A plurality of static contacts are arranged in the cabinet body for grounding, and a plurality of vertical mounting racks are arranged in the cabinet body, and all the vertical mounting racks are rotatably connected with a main shaft;
[0007] A plurality of dynamic contacts are rotatably connected to the vertical mounting rack through the main shaft.
[0008] The opening and closing spring is connected at one end to the middle of the movable contact and at the other end to the vertical mounting frame, and the axis of the opening and closing spring is provided with a radial constraint frame on one side, which is used to prevent the opening and closing spring from bending; a plurality of first cams are coaxially connected to the main shaft; when the opening is performed, the first cam rotating with the main shaft acts on the radial constraint frame, forcing the radial constraint frame to move along its guide to the inside of the cabinet body.
[0009] According to the technical scheme provided in the application example, the cabinet body is provided with a partition plate in the middle for mounting the grounding knife switch; the lateral wall of the partition plate is provided with a horizontal mounting frame, and an insulating column is connected between the horizontal mounting frame and each static contact.
[0010] According to the technical scheme provided in the application example, a plurality of second cams are coaxially connected to the main shaft, and one end of the opening and closing spring acts on the second cam, and the second cam is used to drive the opening and closing spring to store energy.
[0011] According to the technical scheme provided in the application example, the radial constraint frame includes a first joint head rotatably connected to the movable contact, a plurality of limiting rods are fixedly arranged at the bottom of the joint head, used to tightly contact the inner side or the outer side of the opening and closing spring, a second joint head is slidably sleeved at the end of the limiting rod away from the first joint head, and the second joint head is rotatably connected to one end of the vertical mounting frame.
[0012] The opening and closing spring is connected between the first joint head and the corresponding second joint head.
[0013] According to the technical scheme provided in the application example, a plurality of long holes are formed in the partition plate, used to pass through the limiting rods.
[0014] According to the technical scheme provided in the application example, a convex strip is fixedly arranged on the limiting rod, and the first cam is used to push the corresponding convex strip.
[0015] According to the technical scheme provided in the application example, an arc-shaped track is formed in the vertical mounting frame, used to pass through the convex strip.
[0016] The utility model discloses a beneficial effect: a one-key sequence control central distribution cabinet, through setting up radial constraint frame at the opening and closing spring of earthing knife switch, and cooperate with the first cam on the main shaft, when opening, the first cam uses spring tension to drive and press the radial constraint frame in the inner wall of cabinet body, so that it can form direct radial constraint to opening and closing spring, and can assist maintaining the opening state of earthing knife switch. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical scheme in the utility model or prior art, the following will be to the embodiment or prior art description needed to use the drawing briefly introduced, obviously, the following description in the drawing is only the utility model, for the ordinary skilled person in the art comes, under the premise of not paying the creative labor, can also obtain other drawings according to these drawings.
[0018] Figure 1 It is the overall structure schematic diagram of the utility model embodiment;
[0019] Figure 2 It is the structure schematic diagram of the utility model embodiment that has removed part cabinet door;
[0020] Figure 3 It is the structure schematic diagram of earthing knife switch in the utility model embodiment;
[0021] Figure 4 It is Figure 3 The side view;
[0022] Figure 5 It is the split structure schematic diagram of earthing knife switch in the utility model embodiment;
[0023] Figure 6 It is the structure schematic diagram of the first cam in the utility model embodiment;
[0024] Figure 7 It is the structure schematic diagram of radial constraint frame in the utility model embodiment;
[0025] Figure 8 It is the local structure schematic diagram of opening and closing spring in the utility model embodiment.
[0026] Marked as in the drawing:
[0027] 100, cabinet body; 110, partition; 111, long hole;
[0028] 200, one-key sequence control system; 210, one-key trigger unit; 220, sequence control module; 230, switch actuator;
[0029] 300, grounding knife switch; 310, horizontal mounting frame; 311, insulating column; 320, static contact; 330, vertical mounting frame; 3301, arc-shaped track; 331, main shaft; 3311, second cam; 3312, first cam; 340, dynamic contact; 341, synchronization rod; 350, opening and closing spring; 360, radial constraint frame; 361, first joint head; 3610, rotating hinge shaft; 362, limiting rod; 3621, convex strip; 363, second joint head. DETAILED DESCRIPTION
[0030] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below with specific examples.
[0031] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the present application should be understood as the common meaning understood by those skilled in the art to which the present application belongs. The terms "first", "second" and similar terms used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.
[0032] As Figures 1-8The utility model provides a one-key sequence control cubical switchgear, including cabinet 100, one-key sequence control system 200 (not shown in the drawing) is integrated in cabinet 100, the system includes setting in the one-key trigger unit 210 (not shown in the drawing) of cabinet panel or remote terminal, the sequence control module 220 (not shown in the drawing) of built-in cabinet instrument room and with each switch equipment electric connection of switch execution mechanism 230 in the cabinet.When one-key trigger unit 210 receives the opening or closing instruction, sequence control module 220 parses the instruction and drives the corresponding switch execution mechanism 230 to act.In the embodiment, switch execution mechanism 230 includes the electric operation unit of driving ground knife switch 300, is used to receive control signal and drive the automatic opening and closing of ground knife switch 300.Cabinet 100 is provided with ground knife switch 300.Ground knife switch 300 includes: three static contacts 320 for grounding arranged in the inside of cabinet 100, two vertical mounting frames 330 arranged in cabinet 100, all vertical mounting frames 330 are rotatably connected with the same main shaft 331, and three moving contacts 340, all moving contacts 340 are fixedly connected on the main shaft 331, are rotatably connected on the vertical mounting frame 330 through the main shaft 331 and can swing synchronously with the rotation of the main shaft 331, to realize the closing or breaking of static contact 320.One end of opening and closing spring 350 is connected in the middle of moving contact 340, and the other end is connected on vertical mounting frame 330.Radial constraint frame 360 is arranged on the side of the axis of opening and closing spring 350, which is used to prevent the lateral bending of opening and closing spring 350, i.e.buckling, during the working process.A plurality of first cams 3312 are coaxially fixedly connected on the main shaft 331.When opening operation is carried out, the first cam 3312 rotatable with the main shaft 331 will act on the radial constraint frame 360, forcing the radial constraint frame 360 to move along its preset guide direction to the inside of cabinet 100 until the inner wall of cabinet 100 is compressed.
[0033] Preferably, a partition 110 is arranged in the middle of cabinet 100, which separates the inside of the cabinet and is used for installing ground knife switch 300.A horizontal mounting frame 310 is arranged on the side wall of partition 110, and an insulating column 311 is connected between horizontal mounting frame 310 and each static contact 320, so that static contact 320 is reliably supported and insulated on cabinet 100.
[0034] Specifically, a plurality of second cams 3311 are coaxially fixedly connected on the main shaft 331.One end of opening and closing spring 350 acts on the profile surface of second cam 3311.Second cam 3311 is used to drive opening and closing spring 350 to compress or stretch during the rotation of main shaft 331, so as to realize the energy storage and release of spring.
[0035] Preferably, the radial constraint frame 360 includes a first joint head 361, with a rotating hinge shaft 3610 on its upper part. The first joint head 361 is rotatably connected to the middle of the moving contact 340 via the rotating hinge shaft 3610. The end of the rotating hinge shaft 3610 can engage with the outer contour surface of the second cam 3311 to achieve over-dead-point self-holding for the rapid opening and closing of the grounding switch 300. Over-dead-point holding is a prior art technique, designed to suddenly release the tension of the opening and closing spring 350 at the end of the opening and closing state of the grounding switch 300, so as to avoid the generation of electric arc at the opening and closing points of the moving and stationary contacts. All three moving contacts 340 are connected by the same synchronizing rod 341, thereby ensuring the synchronous opening and closing of the three ground circuits through synchronous swing.
[0036] Specifically, four limiting rods 362 are fixedly installed at the bottom of the first joint head 361. Two limiting rods 362 are close to the inner side of the opening and closing spring 350, and the other two are close to the outer side of the spring, thus clamping the opening and closing spring 350 between the inner and outer limiting rods 362 to provide radial limiting. A second joint head 363 is slidably sleeved at the end of the limiting rod 362 away from the first joint head 361, and the second joint head 363 is rotatably connected to one end of the vertical mounting bracket 330. The opening and closing spring 350 is actually connected between the first joint head 361 and the corresponding second joint head 363. This design makes the radial constraint bracket 360 itself a movable linkage mechanism, which can both follow the movement of the moving contact and constrain the spring through the limiting rods 362.
[0037] Preferably, in order to provide space for the movement of the radial constraint frame 360 on the cabinet 100, a plurality of elongated holes 111 are provided on the partition 110 for the limit bar 362 to pass through, allowing the limit bar 362 to move along the extension direction of the elongated holes 111 during the opening and closing of the circuit breaker.
[0038] In this embodiment, as Figure 7 and Figure 8 As shown, in order to accurately convert the rotational motion of the spindle 331 into a pushing action on the radial constraint frame 360, a protrusion 3621 is fixedly provided on the limiting rod 362. Figure 5 and Figure 6 As shown, the profile of the first cam 3312 on the main shaft 331 is designed in the shape of the Arabic numeral "6" (or "9"), which can reliably contact and push the corresponding protrusion 3621 during the opening rotation, thereby driving the entire radial constraint frame 360 to move towards the inner wall of the cabinet 100.
[0039] Preferably, in order to guide the movement trajectory of the protrusion 3621 and ensure the stability of the radial constraint frame 360 movement, an arc-shaped track 3301 is provided on the vertical mounting frame 330. The protrusion 3621 can slide through or be embedded in the arc-shaped track 3301.
[0040] Furthermore, it should be noted that the components involved in this invention, such as the one-key sequential control system 200, one-key triggering unit 210, sequential control module 220, switch actuator 230, electric operating unit, and position sensor, are all general standard parts or components known to those skilled in the art. Their structures and principles can be obtained by those skilled in the art through technical manuals or conventional experimental methods. Their electrical connections can be adapted according to specific one-key sequential control logic, and the detailed connection and control methods are all technologies known in the art.
[0041] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; within the framework of the present invention, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in the details for the sake of brevity.
[0042] This utility model is intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. A one-button sequential control central cabinet, comprising a cabinet body (100), characterized in that, The cabinet (100) is equipped with a grounding switch (300), which includes: Several stationary contacts (320) are disposed inside the cabinet (100) for grounding; several vertical mounting brackets (330) are disposed inside the cabinet (100), and a main shaft (331) is rotatably inserted into all of the vertical mounting brackets (330). A plurality of moving contacts (340), all of which are rotatably connected to the vertical mounting bracket (330) via the main shaft (331); The opening and closing spring (350) is connected at one end to the middle of the moving contact (340) and at the other end to the vertical mounting bracket (330). A radial constraint bracket (360) is provided on one side of the axis where the opening and closing spring (350) is located to prevent the opening and closing spring from bending. Several first cams (3312) are coaxially connected on the main shaft (331). When the circuit is opened, the first cams (3312) that rotate with the main shaft (331) act on the radial constraint bracket (360), forcing the radial constraint bracket (360) to move along its guide towards the inside of the cabinet (100).
2. The one-button sequential control central cabinet according to claim 1, characterized in that, A partition (110) is provided in the middle of the cabinet (100) for installing the grounding switch (300); a horizontal mounting bracket (310) is provided on the side wall of the partition (110), and an insulating column (311) is connected between the horizontal mounting bracket (310) and each of the stationary contacts (320).
3. The one-button sequential control central cabinet according to claim 2, characterized in that, A plurality of second cams (3311) are coaxially connected to the main shaft (331). One end of the opening and closing spring (350) acts on the second cam (3311), and the second cam (3311) is used to drive the opening and closing spring (350) to store energy.
4. The one-button sequential control central cabinet according to claim 3, characterized in that, The radial constraint frame (360) includes a first joint head (361) rotatably connected to the moving contact (340). A plurality of limiting rods (362) are fixedly provided at the bottom of the joint head (361) for pressing against the inner or outer side of the opening and closing spring (350). A second joint head (363) is slidably sleeved at the end of the limiting rod (362) away from the first joint head (361), and the second joint head (363) is rotatably connected to one end of the vertical mounting frame (330). The opening and closing spring (350) is connected between the first joint head (361) and the corresponding second joint head (363).
5. A one-button sequential control central cabinet according to claim 4, characterized in that, The partition (110) has several elongated holes (111) for the limit bar (362) to pass through.
6. The one-button sequential control cabinet according to claim 5, characterized in that, A protrusion (3621) is fixedly provided on the limiting rod (362), and the first cam (3312) is used to push the corresponding protrusion (3621).
7. A one-button sequential control central cabinet according to claim 6, characterized in that, The vertical mounting bracket (330) is provided with an arc-shaped track (3301) for the passage of the protrusion (3621).