Interlocking mechanism of permanent magnet ring main unit

Abstract

The utility model relates to an interlocking mechanism of a permanent magnet ring main unit, which comprises a support frame and a support frame, the support frame is provided with a mounting hole, a driving shaft is arranged in the mounting hole, one end of the driving shaft extends outwards and is provided with a cam, and the other end of the driving shaft is connected with a transmission shaft of a permanent magnet circuit breaker through a coupler. Two guide pins are arranged on the outer side of the supporting frame and located below the driving shaft, an interlocking sliding plate is installed on the two guide pins in a sliding mode, kidney-shaped holes are formed in the positions, corresponding to the two guide pins, of the interlocking sliding plate so that the interlocking sliding plate can slide in the vertical direction, and a reset tension spring is installed between the inner side of the interlocking sliding plate and the supporting frame. A top plate is arranged at the top end of the interlocking sliding plate corresponding to the cam, and a locking part is arranged at the lower end of the interlocking sliding plate and used for shielding an operation shaft of the isolation mechanism; according to the utility model, interlocking between the permanent magnetic mechanism and the isolation mechanism of the permanent magnetic ring main unit is realized, and the operation safety is improved.

Description

Technical Field

[0001] This utility model relates to the field of ring main unit technology, specifically an interlocking mechanism for a permanent magnet ring main unit. Background Technology

[0002] In power systems, ring main units (RMS) serve as crucial switching equipment, undertaking the functions of power system protection and control. The permanent magnet circuit breaker (PMB) mechanism and the disconnecting switch mechanism are key components of the RMS. To ensure the safe operation of the RMS, it is essential to guarantee the correct operating sequence between the PMB and the disconnecting switch mechanisms to avoid safety accidents caused by misoperation. However, existing interlocking mechanisms often suffer from problems such as complex structure, low reliability, or inconvenient operation. For example, some interlocking mechanisms require multiple complex mechanical parts to work together, making them prone to failure; while other interlocking mechanisms, although simple in structure, cannot achieve comprehensive interlocking functions and cannot ensure safe isolation between the PMB and the disconnecting switch mechanisms. Utility Model Content

[0003] The main purpose of this utility model is to solve the problems existing in the prior art and provide an interlocking mechanism for a permanent magnet ring main unit.

[0004] The specific solution of this utility model is as follows: an interlocking mechanism for a permanent magnet ring main unit, including a support frame, the support frame having mounting holes, a drive shaft installed in the mounting holes, one end of the drive shaft extending outward and equipped with a cam, the other end of the drive shaft being connected to the transmission shaft of a permanent magnet circuit breaker via a coupling, two guide pins located below the drive shaft on the outer side of the support frame, an interlocking slide plate slidably mounted on the two guide pins, an oblong hole corresponding to each of the two guide pins on the interlocking slide plate to allow the interlocking slide plate to slide vertically, a return spring being installed between the inner side of the interlocking slide plate and the support frame, a top plate being provided at the top of the interlocking slide plate corresponding to the cam, and a locking part being provided at the lower end of the interlocking slide plate to block the operating shaft of the isolation mechanism.

[0005] Furthermore, a sensor is also installed at the lower end of the interlocking slide plate. The sensor is used to cooperate with the isolation mechanism opening and closing indicator plate to detect the opening and closing status of the isolation mechanism. The sensor is connected to the drive mechanism of the permanent magnet circuit breaker.

[0006] Furthermore, the outer end of the drive shaft is provided with an operating section, which has an external hexagonal shape. The operating section is used for manual tripping operation by means of a wrench in emergency situations.

[0007] Furthermore, the wrench includes a socket and an operating lever. The socket is provided with an internal hexagonal socket that matches the external hexagonal socket of the operating part. The operating lever is perpendicular to the socket and fixedly connected.

[0008] Furthermore, the support frame is composed of multiple layers, each layer including a base plate and several support shafts.

[0009] Compared with the prior art, this utility model has the following advantages: 1. The main shaft of the interlocking mechanism of this utility model is directly connected to the auxiliary transmission shaft of the permanent magnet mechanism. This design allows the movement of the interlocking mechanism and the permanent magnet circuit breaker mechanism to be synchronized, eliminating the need for additional transmission components, simplifying the structure, and improving reliability; 2. When the permanent magnet circuit breaker is closed, the crank arm of the main shaft of the interlocking mechanism pushes down the interlocking slide plate, which blocks the operating hole of the isolating mechanism, thereby effectively preventing the operation of the isolating switch. When the circuit breaker is opened, the crank arm pulls down the interlocking slide plate, opening the operating hole of the isolating mechanism and allowing the operation of the isolating switch. This design ensures the correct operating sequence between the permanent magnet circuit breaker mechanism and the isolating switch mechanism; 3. When the isolating mechanism moves to separate the isolating switch, the sensor can detect the open state of the isolating switch and automatically lock the signal of the permanent magnet mechanism, preventing the permanent magnet mechanism from working. This design further enhances the safety of the interlocking mechanism and prevents the permanent magnet circuit breaker from being misoperated when the isolating switch is not fully open; 4. The interlocking mechanism of this utility model also has the function of manually emergency tripping the permanent magnet circuit breaker. In an emergency, operators can manually trip the permanent magnet circuit breaker by inserting the manual trip handle into the main shaft of the interlocking mechanism. This design improves the emergency response capability of the ring main unit. Attached Figure Description

[0010] Figure 1 This is a three-dimensional view of the structure of this utility model;

[0011] Figure 2 This is a three-dimensional view of the present invention installed in a ring main unit;

[0012] Figure 3 yes Figure 2 A stereoscopic view from another perspective;

[0013] Figure 4 This is a schematic diagram of the present invention when the permanent magnet circuit breaker is in the open state;

[0014] Figure 5 This is a schematic diagram of the present invention when the permanent magnet circuit breaker is in the closed state;

[0015] Figure 6 This is a schematic diagram of the manual emergency tripping function of this utility model;

[0016] In the diagram: 1. Support frame; 2. Drive shaft; 3. Cam; 4. Interlocking slide plate; 5. Guide pin; 6. Locking part; 7. Sensor; 8. Transmission shaft; 9. Coupling; 10. Operating shaft; 11. Opening / closing indicator plate; 12. Reset spring; 13. Wrench. Detailed Implementation

[0017] See Figure 1-6 This embodiment is an interlocking mechanism for a permanent magnet ring main unit, including a support frame 1. The support frame 1 has mounting holes, and a drive shaft 2 is installed in the mounting holes. One end of the drive shaft 2 extends outward and is equipped with a cam 3. The other end of the drive shaft 2 is connected to the transmission shaft 8 of the permanent magnet circuit breaker through a coupling 9. Two guide pins 5 are provided on the outside of the support frame 1 below the drive shaft 2. An interlocking slide plate 4 is slidably mounted on the two guide pins 5. Each of the two guide pins 5 has a waist-shaped hole, which allows the interlocking slide plate to slide vertically. A return spring 12 is installed between the inner side of the interlocking slide plate 4 and the support frame 1. A top plate is provided at the top of the interlocking slide plate 4 corresponding to the cam 3. A locking part 6 is provided at the lower end of the interlocking slide plate 4. The locking part 6 is used to block the operating shaft 10 of the isolation mechanism.

[0018] Furthermore, a sensor 7 is also installed at the lower end of the interlocking slide plate 4. The sensor 7 is used to cooperate with the isolation mechanism opening and closing indicator plate 11 to detect the opening and closing status of the isolation mechanism. The sensor 7 is connected to the drive mechanism of the permanent magnet circuit breaker.

[0019] Furthermore, the outer end of the drive shaft 2 is provided with an operating section, which has an external hexagonal shape. The operating section is used for manual tripping operation by means of a wrench 13 in an emergency.

[0020] Furthermore, the wrench 13 includes a sleeve and an operating lever. The sleeve is provided with an internal hexagonal socket that matches the external hexagonal socket of the operating part. The operating lever is perpendicular to the sleeve and fixedly connected.

[0021] Furthermore, the support frame 1 is composed of multiple layers, each layer including a base plate and several support shafts.

[0022] The working principle of this utility model is as follows: See Figure 4 When the permanent magnet circuit breaker is in the open state, the cam 3 on the drive shaft 2 is in an inclined state. At this time, the interlocking slide plate 4 is pressed against the cam 3 under the action of the reset spring 12. Therefore, the lower locking part 6 of the interlocking slide plate 4 is misaligned with the operating shaft 10 of the isolation mechanism, thereby exposing the operating shaft 10. In this state, the isolation mechanism can be operated; see also Figure 5 When the permanent magnet circuit breaker is in the closed state, the cam 3 is in the vertical state. At this time, the interlocking slide is in the lowest position, the locking part 6 blocks the operating shaft 10, and the isolation mechanism is not allowed to be operated. At the same time, the reset spring 12 is in the extended and stored state.

[0023] When the isolating mechanism operates and the isolating switch is opened, the opening / closing indicator 11 will rotate with the main shaft of the isolating mechanism. When the sensor 7 cannot detect the opening / closing indicator 11, it indicates that the isolating switch is currently in the open state. The sensor 7 automatically sends a signal to the permanent magnet mechanism to automatically lock the permanent magnet mechanism signal, so that the permanent magnet mechanism cannot work.

[0024] This design further enhances the safety of the interlocking mechanism, preventing accidental operation of the permanent magnet circuit breaker if the disconnecting switch is not fully open.

[0025] In an emergency, the operator can use wrench 13 to turn drive shaft 2, which in turn drives transmission shaft 8 to open the permanent magnet circuit breaker mechanism.

Claims

1. An interlocking mechanism for a permanent magnet ring main unit, characterized in that: The device includes a support frame with mounting holes. A drive shaft is installed in the mounting holes. One end of the drive shaft extends outward and is equipped with a cam. The other end of the drive shaft is connected to the drive shaft of a permanent magnet circuit breaker via a coupling. Two guide pins are located on the outside of the support frame below the drive shaft. An interlocking slide plate is slidably mounted on the two guide pins. Each interlocking slide plate has a waist-shaped hole corresponding to one of the two guide pins, allowing the interlocking slide plate to slide vertically. A return spring is installed between the inner side of the interlocking slide plate and the support frame. A top plate is located at the top of the interlocking slide plate corresponding to the cam. A locking part is located at the lower end of the interlocking slide plate, which is used to block the operating shaft of the isolation mechanism.

2. The interlocking mechanism of a permanent magnet ring main unit according to claim 1, characterized in that: The lower end of the interlocking slide is also equipped with a sensor, which is used to cooperate with the isolation mechanism opening and closing indicator plate to detect the opening and closing status of the isolation mechanism. The sensor is connected to the drive mechanism of the permanent magnet circuit breaker.

3. The interlocking mechanism of a permanent magnet ring main unit according to claim 1, characterized in that: The outer end of the drive shaft is provided with an operating section, which has an external hexagonal shape. The operating section is used for manual tripping operation by means of a wrench in emergency situations.

4. The interlocking mechanism of a permanent magnet ring main unit according to claim 3, characterized in that: The wrench includes a socket and an operating lever. The socket is provided with an internal hexagonal socket that matches the external hexagonal socket of the operating part. The operating lever is perpendicular to the socket and fixedly connected.

5. The interlocking mechanism of a permanent magnet ring main unit according to claim 1, characterized in that: The support frame is composed of multiple layers, each layer including a base plate and several support shafts.

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