Dual bus switchgear disconnector and isolator two-in-one mechanical locking structure

Abstract

The utility model relates to a two -in -one mechanical locking structure of disconnecting switch of double bus switch cabinet belongs to the electric power equipment safety technical field. The device aims at solving the problem of low reliability and existing safety hidden danger of the existing electromagnetic locking mode. The utility model adopts pure mechanical linkage structure, mainly includes two sets of disconnecting switch operating mechanism corresponding I, II section bus respectively, operating mechanism linkage elbow plate, operating mechanism limit board, locking mounting plate, locking linkage board, linkage steering plate and tension spring. Through the mechanical interference between operating mechanism limit board and locking linkage board, the logic locking that "only when one disconnecting switch is in the state of opening, another disconnecting switch can be operated" is forced to realize, effectively prevents two section bus disconnecting switch to close simultaneously. The utility model core lies in realizing the locking function through mechanical structure itself, and the reliability is high, and the safety is strong, and the position of adding locking electromagnet is reserved simultaneously, and the electrical locking function can be expanded, satisfies the safety demand under different scenes.

Description

Technical Field

[0001] This utility model belongs to the technical field of packaging machinery and equipment, and relates to a mechanical interlocking structure that combines a double busbar switch and a disconnector switch. Background Technology

[0002] In power systems, the 10kV double busbar connection is an important means to improve power supply reliability and operational flexibility. In such switchgear, two disconnecting switches are typically installed, connected to busbars I and II respectively. To ensure safety, it is crucial to strictly prevent both disconnecting switches from being closed simultaneously; otherwise, the two busbars will be unexpectedly connected in parallel, potentially leading to serious electrical accidents such as short circuits and arcing explosions, posing a significant threat to equipment and personnel safety.

[0003] Currently, the industry commonly uses electromagnetic locks to achieve the interlocking function of such disconnect switches through electrical circuits. This solution relies on secondary control power supply, relay logic, and the execution of electromagnets, which inherently presents safety hazards. For example, when the control power supply fails, the electromagnet malfunctions, or the relay misoperates, the interlocking function may fail, thus losing its ability to prevent misoperation. Furthermore, the reliability of purely electrical interlocking depends on the complexity of the circuit, making maintenance and troubleshooting relatively difficult.

[0004] Therefore, there is an urgent need in this field for a locking device that does not rely on electrical components, is implemented purely through mechanical structures, and has higher reliability and stronger security, so as to fundamentally solve the problem of potential failure of electrical locking. Summary of the Invention

[0005] To address the aforementioned problems, this utility model provides a mechanical interlocking structure that integrates the isolating switch of a double busbar switchgear. This mechanical interlocking structure is installed in the medium-voltage switchgear cabinet and is operated mechanically, ensuring reliable operation. In conjunction with the added interlocking electromagnet, it can conveniently add electrical interlocking functionality for users who require it.

[0006] According to the technical solution of this utility model: a mechanical interlocking mechanism for a 10kV double busbar switchgear with two disconnecting switches, characterized in that: it includes a first disconnecting switch operating mechanism and a second disconnecting switch operating mechanism, the first disconnecting switch operating mechanism corresponds to bus section I, the second disconnecting switch operating mechanism corresponds to bus section II, a first operating mechanism linkage bending plate is installed on the first disconnecting switch operating mechanism, and a second operating mechanism linkage bending plate is installed on the second disconnecting switch operating mechanism. The main shaft of the first disconnector operating mechanism is equipped with a first operating mechanism limit plate, and the main shaft of the second disconnector operating mechanism is equipped with a second operating limit plate. An interlocking mounting plate is installed on the cabinet of the switchgear, and a first interlocking linkage plate and a second interlocking linkage plate are installed on the interlocking mounting plate. The second linkage steering plate is connected to the second operating mechanism linkage bending plate and the second locking linkage plate, and the tension spring is connected to the first operating mechanism linkage bending plate and the second operating mechanism linkage bending plate. When the first operating mechanism linkage plate is pressed down, it drives the first locking linkage plate to move downward, allowing the operation of the first disconnecting switch operating mechanism. When the first operating mechanism limit plate is in the closed state, the upward movement of the second locking linkage plate will be blocked by the first operating mechanism limit plate, preventing the operation of the second disconnecting switch operating mechanism. When the second operating mechanism linkage plate is pressed down, it drives the second linkage steering plate to move downward and the second locking linkage plate to move upward, allowing the operation of the second disconnecting switch operating mechanism. When the second operating mechanism limit plate is in the closed state, the downward movement of the first locking linkage plate will be blocked by the second operating mechanism limit plate, preventing the operation of the first disconnecting switch operating mechanism.

[0007] As a further improvement of this utility model, it also includes a first locking electromagnet and a second locking electromagnet. The first locking electromagnet is installed below the linkage plate of the first operating mechanism, and the second locking electromagnet is installed below the linkage plate of the second operating mechanism. When the first locking electromagnet and the second locking electromagnet are not energized, their locking rods respectively prevent the linkage plate of the first operating mechanism and the linkage plate of the second operating mechanism from moving downward.

[0008] As a further improvement of this utility model, the locking mounting plate is installed on the right side of the switch cabinet body.

[0009] As a further improvement of this utility model, the first operating mechanism linkage plate and the second operating mechanism linkage plate usually block the main shaft of the first disconnecting switch operating mechanism and the main shaft of the second disconnecting switch operating mechanism under the action of the tension spring, so as to prevent the external operating handle from operating directly.

[0010] As a further improvement of this utility model, the second linkage steering plate converts the downward movement of the second operating mechanism linkage bending plate into the upward movement of the second locking linkage plate.

[0011] As a further improvement of this utility model, the first disconnecting switch operating mechanism is fixed to the switch cabinet by the first aluminum support, and the second disconnecting switch operating mechanism is fixed to the switch cabinet by the second aluminum support.

[0012] The technical advantages of this utility model are as follows: This utility model adopts a purely mechanical linkage structure. Its interlocking logic is achieved through the movement and interference of physical components, without relying on external power sources or electrical components. This fundamentally avoids interlocking failure caused by power outages or electrical faults, greatly improving the inherent safety level of the equipment. Through the mechanical interference between the operating mechanism's limit plate and the interlocking linkage plate, the logic of "only one disconnecting switch can be closed" is strictly guaranteed. When one disconnecting switch is closed, its limit plate physically blocks the operating channel of another disconnecting switch, forming a mandatory mechanical interlock, effectively eliminating the possibility of human error. All mechanical components are integrated into a single interlocking mounting plate, which can be installed as a whole on the side of the switchgear cabinet. The structural layout is reasonable, does not occupy too much space, and is easy to modify in existing switchgear or integrate into new cabinets. In addition to providing reliable mechanical interlocking, a position is reserved for installing an interlocking electromagnet. Users can, as needed, superimpose electrical interlocking functions on top of the mechanical interlocking to achieve multiple interlocking with "mechanical as the main and electrical as the auxiliary," meeting the needs of higher safety levels or remote monitoring. The operating mechanism's linkage plate automatically resets under the action of the tension spring, always blocking the operating spindle. This not only prevents misoperation but also provides clear indication of the operating status. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the primary wiring scheme for the switchgear.

[0014] Figure 2 This is a front view of the present invention in its installed state.

[0015] Figure 3 This is a side view of the present invention.

[0016] Figure 4 This is a perspective view of the present invention.

[0017] Figure 5 This is the view of the locking action status. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0019] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0020] Figure 1-5The components include a first main shaft 1, a second main shaft 2, a first aluminum support 3, a second aluminum support 4, a first operating mechanism linkage bending plate 5, a second operating mechanism linkage bending plate 6, a first operating mechanism limiting plate 7, a second operating mechanism limiting plate 8, a locking mounting plate 9, a first locking linkage plate 10, a second locking linkage plate 11, a second linkage steering plate 12, a first locking electromagnet 13, a second locking electromagnet 14, a locking mounting plate 15, a tension spring 16, a first disconnecting switch operating mechanism 100, and a second disconnecting switch operating mechanism 200, etc.

[0021] The first disconnector switch operating mechanism 100 includes a first main shaft 1, a first aluminum support 3, a first operating mechanism linkage bending plate 5, a first operating mechanism limiting plate 7, a first indicator cover 17, a first sector plate 19, a first bushing A21, a first bushing B23, and a first bearing 25. During installation, the first indicator cover 17 is first placed into the round hole of the first aluminum support 3, and the first aluminum support 3 presses the first operating mechanism linkage bending plate 5 onto the cabinet. Then, the first bushing A21, the first operating mechanism limiting plate 7, the first bushing B23, the first sector plate 19, and the first bearing 25 are sequentially installed on the first main shaft 1. Finally, the first main shaft 1 is installed into the round hole of the first aluminum support 3. The first bushing A21, the first operating mechanism limiting plate 7, the first bushing B23, the first sector plate 19, the first bearing 25, and the first indicator cover 17 rotate together with the first main shaft 1. The first bushing A21 and the first bushing B23 position the first operating mechanism limiting plate 7. The first sector plate 19 is used to limit the rotation angle of the first main shaft 1. The first indicator cover 17 is used to indicate the angular position of the first main shaft 1. The first bearing 25 is used to connect the first main shaft 1 and the first aluminum support 3, so that the first main shaft 1 can rotate in the first aluminum support 3.

[0022] The second disconnector operating mechanism 200 includes a second main shaft 2, a second aluminum support 4, a second operating mechanism linkage bend plate 6, a second operating mechanism limit plate 8, a second indicator cover 18, a second sector plate 20, a second bushing A22, a second bushing B24, and a second bearing 26. During installation, the second indicator cover 18 is first placed into the round hole of the second aluminum support 4, and the second aluminum support 4 presses down the second operating mechanism linkage bend plate 6 onto the cabinet. Then, the second bushing A22, the second operating mechanism limit plate 8, the second bushing B24, the second sector plate 20, and the second bearing 26 are sequentially installed on the second main shaft 2. Finally, the second main shaft 2 is installed into the round hole of the second aluminum support 4. The second bushing A22, the second operating mechanism limiting plate 8, the second bushing B24, the second sector plate 20, the second bearing 26, and the second indicator cover 18 rotate together with the second main shaft 2. The second bushing A22 and the second bushing B24 position the second operating mechanism limiting plate 8. The second sector plate 20 is used to limit the rotation angle of the second main shaft 2. The second indicator cover 18 is used to indicate the angular position of the second main shaft 2. The second bearing 26 is used to connect the second main shaft 2 and the second aluminum support 4, so that the second main shaft 2 can rotate in the second aluminum support 4.

[0023] like Figure 1-5 As shown, the combined mechanical interlocking structure of the isolating switch in the double busbar switchgear of this utility model is preferably installed on the right side plate of a 10kV double busbar center-mounted switchgear. First, the operating mechanism of the isolating switch is installed: The first operating mechanism linkage bending plate 5 is installed on the first aluminum support 3 of the first disconnecting switch operating mechanism 100, and the first operating mechanism limiting plate 7 is installed on the first main shaft 1 of the first disconnecting switch operating mechanism 100. Then the first main shaft 1 is installed as a whole on the first aluminum support 3.

[0024] Similarly, the second operating mechanism linkage bending plate 6 is installed on the second aluminum support 4 of the second disconnecting switch operating mechanism 200, and the second operating mechanism limiting plate 8 is installed on the second main shaft 2 of the disconnecting switch operating mechanism. Then, the second main shaft 2 is installed as a whole on the second aluminum support 4.

[0025] Next, install the core interlocking components: The first interlocking linkage plate 10 and the second interlocking linkage plate 11 are installed together on the interlocking mounting plate 9, and then the interlocking mounting plate 9 is fixed as a whole to the right side plate of the switch cabinet.

[0026] Install the second linkage steering plate 12, with one end connected to the second operating mechanism linkage bending plate 6 and the other end connected to the second locking linkage plate 11.

[0027] Install the locking mounting plate 15, and use tension springs 16 to connect the first operating mechanism linkage plate 5 and the second operating mechanism linkage plate 6 respectively, so that the two are kept at the upper limit position without external force.

[0028] Finally, as an optional step, a first locking electromagnet 13 and a second locking electromagnet 14 may be installed on the locking mounting plate 15, located directly below the first operating mechanism linkage plate 5 and the second operating mechanism linkage plate 6, respectively.

[0029] The working process of this utility model is as follows: In the initial state, both disconnect switches are in the open position, and the first operating mechanism limit plate 7 and the second operating mechanism limit plate 8 are both in the vertically downward "open" state. At this time, the tension spring 16 causes the first operating mechanism linkage bending plate 5 and the second operating mechanism linkage bending plate 6 to block their respective main shaft operating holes.

[0030] Implementation Scenario 1: Operating the I-section bus disconnect switch The operator applies a downward force to the linkage plate 5 of the first operating mechanism to overcome the tension of the tension spring 16 and move it downward.

[0031] This action causes the first interlocking linkage plate 10 to move downwards. Since the operating mechanism limit plate (II) 8 is in the open state at this time, it leaves space for the first interlocking linkage plate 10 to move downwards, so the movement is unimpeded.

[0032] After the first operating mechanism linkage bending plate 5 moves down, the operating hole of the first main shaft 1 of the first disconnecting switch operating mechanism 100 is exposed. At this time, the external operating handle is inserted and rotated clockwise to drive the first main shaft 1 to rotate, thereby driving the first operating mechanism limit plate 7 to rotate to the horizontal (or specific angle) "closed" state.

[0033] When the handle is removed, the first operating mechanism linkage plate 5 automatically resets under the action of the tension spring 16, and re-covers the first main shaft 1.

[0034] Lockout in effect: At this time, if an attempt is made to operate the II-section bus disconnect switch, pressing down the second operating mechanism linkage plate 6 will drive the second locking linkage plate 11 to move upward via the second linkage steering plate 12. However, since the first operating mechanism limit plate 7 is already in the closed state (horizontal position), its plate body is exactly blocking the upward movement path of the second locking linkage plate 11, resulting in mechanical interference. This prevents the second operating mechanism linkage plate 6 from being pressed down, thus preventing the operating hole of the second main shaft 2 from being exposed, thereby achieving forced locking of the II-section bus disconnect switch.

[0035] Implementation Scenario 2: Operating the II-section busbar disconnect switch With the I-stage disconnector open, press down the linkage bend 6 of the second operating mechanism.

[0036] This action is converted into the upward movement of the second locking linkage plate 11 via the second linkage steering plate 12. Since the first operating mechanism limit plate 7 is in the open state, the movement is unimpeded.

[0037] Expose the operating hole of the second main shaft 2, insert the handle to operate, and rotate the limit plate 8 of the second operating mechanism to the "closed" state.

[0038] After being released, the second operating mechanism automatically resets the linkage bending plate 6.

[0039] Lockout in effect: At this time, if an attempt is made to operate the I-section bus disconnect switch, pressing down the first operating mechanism linkage plate 5 will cause the first lockout linkage plate 10 to move downward. At this time, the second operating mechanism limit plate 8, which is already in the closed state, will block the downward movement path of the first lockout linkage plate 10, forming mechanical interference and prohibiting the operation of the I-section bus disconnect switch.

[0040] Cooperative operation of electrical interlocking: When the first interlocking electromagnet 13 and the second interlocking electromagnet 14 are installed: In the absence of an operation permission signal, the interlocking electromagnets are not energized, and their locking rods are in the extended state, physically blocking the lower part of the linkage plate of the operating mechanism. At this time, even if the mechanical interlocking itself allows operation, the operator cannot press down the linkage plate, thus achieving remote or logical interlocking.

[0041] When an operation permission signal is received, the corresponding locking electromagnet is energized, the locking rod retracts, and the obstruction to the linkage bending plate is released. Only then can the above-mentioned mechanical operation be performed.

[0042] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A mechanical interlocking structure combining a disconnector switch and a double busbar switchgear, characterized in that: It includes a first disconnector operating mechanism and a second disconnector operating mechanism. The first disconnector operating mechanism corresponds to bus section I, and the second disconnector operating mechanism corresponds to bus section II. A first operating mechanism linkage bend plate (5) is installed on the first disconnector operating mechanism, and a second operating mechanism linkage bend plate (6) is installed on the second disconnector operating mechanism. The main shaft of the first disconnector switch operating mechanism is equipped with a first operating mechanism limit plate (7), and the main shaft of the second disconnector switch operating mechanism is equipped with a second operating mechanism limit plate (8). A locking mounting plate (15) is installed on the cabinet of the switchgear, and a first locking linkage plate (10) and a second locking linkage plate (11) are installed on the locking mounting plate (15). The second linkage steering plate (12) is connected to the second operating mechanism linkage bending plate (6) and the second locking linkage plate (11), and the tension spring (16) is connected to the first operating mechanism linkage bending plate (5) and the second operating mechanism linkage bending plate (6). When the first operating mechanism linkage plate (5) is pressed down, it drives the first locking linkage plate (10) to move downward, allowing the operation of the first disconnecting switch operating mechanism. When the first operating mechanism limit plate (7) is in the closed state, the second locking linkage plate (11) will be blocked by the first operating mechanism limit plate (7) when it moves upward, preventing the operation of the second disconnecting switch operating mechanism. When the second operating mechanism linkage plate (6) is pressed down, it drives the second linkage steering plate (12) to move downward and drives the second locking linkage plate (11) to move upward, allowing the operation of the second disconnecting switch operating mechanism. When the second operating mechanism limit plate (8) is in the closed state, the first locking linkage plate (10) will be blocked by the second operating mechanism limit plate (8) when it moves downward, preventing the operation of the first disconnecting switch operating mechanism.

2. The mechanical interlocking structure for the combined isolating switch of the double busbar switchgear as described in claim 1, characterized in that: It also includes a first locking electromagnet (13) and a second locking electromagnet (14). The first locking electromagnet (13) is installed below the first operating mechanism linkage plate (5), and the second locking electromagnet (14) is installed below the second operating mechanism linkage plate (6). When the first locking electromagnet (13) and the second locking electromagnet (14) are not energized, their locking rods respectively prevent the first operating mechanism linkage plate (5) and the second operating mechanism linkage plate (6) from moving downward.

3. The mechanical interlocking structure for the combined isolating switch of the double busbar switchgear as described in claim 1, characterized in that: The locking mounting plate (15) is installed on the right side of the switch cabinet.

4. The mechanical interlocking structure for the combined isolating switch of the double busbar switchgear as described in claim 1, characterized in that: Under the action of the tension spring (16), the first operating mechanism linkage plate (5) and the second operating mechanism linkage plate (6) usually block the main shaft of the first disconnecting switch operating mechanism and the main shaft of the second disconnecting switch operating mechanism to prevent the external operating handle from operating directly.

5. The mechanical interlocking structure for the combined isolating switch of the double busbar switchgear as described in claim 1, characterized in that: The second linkage steering plate (12) converts the downward movement of the second operating mechanism linkage bending plate (6) into the upward movement of the second locking linkage plate (11).

6. The mechanical interlocking structure for the combined isolating switch of the double busbar switchgear as described in claim 1, characterized in that: The first disconnector operating mechanism is fixed to the switch cabinet by the first aluminum support (3), and the second disconnector operating mechanism is fixed to the switch cabinet by the second aluminum support (4).

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