A thermomagnetic circuit breaker verification device for nuclear power plants

Abstract

The application belongs to the technical field of thermal magnetic circuit breakers, and discloses a thermal magnetic circuit breaker checking device for a nuclear power plant, which comprises a protection box, a checking device body, a workbench and an opening, the checking device body comprises a connecting piece arranged in the opening, a plurality of positioning holes are arranged on the workbench, a plug-in column matched with the positioning holes is arranged in the positioning holes, a placing plate is arranged on the plurality of plug-in columns, a placing groove is formed in the placing plate corresponding to the connecting piece, and a strip-shaped hole is formed in the bottom of the placing groove. An operator first puts the circuit breakers to be checked into the placing grooves of the placing plate one by one to avoid subsequent docking deviation. Then, the plug-in columns are aligned and plugged into the positioning holes, after the plug-in columns are positioned, the circuit breakers are lightly pressed, the inserts of the circuit breakers can be stably connected with the connecting pieces, repeated adjustment is not needed, the operation difficulty is reduced, and the time consumption is reduced. After the checking is completed, the placing plate is pulled upwards, all the checked circuit breakers are synchronously moved upwards, the inserts of the circuit breakers are quickly separated from the connecting pieces, and multiple circuit breakers are realized to be disassembled at one time.

Description

Technical Field

[0001] This utility model relates to the field of thermomagnetic circuit breaker technology, and in particular to a thermomagnetic circuit breaker calibration device for nuclear power plants. Background Technology

[0002] Nuclear power plants are facilities that use the nuclear fission reaction of uranium or plutonium to generate heat and drive steam turbine generators to produce electricity. Their operation places extremely stringent requirements on the continuity and stability of power supply. In the complex power supply network of a nuclear power plant, circuit breakers are the core equipment for circuit protection and control. Nuclear safety-grade circuit breakers require regular performance verification to ensure that their protection characteristics meet design requirements and that they can operate reliably in the event of a fault.

[0003] Currently, existing thermal-magnetic circuit breaker testing devices require circuit breakers to be inserted one by one into the connectors of the testing device. The circuit breaker plates are small, and the circuit breaker positions need to be repeatedly adjusted to ensure the insertion of the plates. After the test is completed, they also need to be removed one by one, which makes the waiting time between each test of the testing device long and the testing efficiency low. Utility Model Content

[0004] To address the aforementioned problems, this invention provides a thermal-magnetic circuit breaker calibration device for nuclear power plants.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a thermal-magnetic circuit breaker calibration device for nuclear power plants, comprising a protective box and a calibration device body disposed within the protective box. The protective box is provided with a workbench, and the workbench has several openings. The calibration device body includes a connector disposed within the opening for connection with the thermal circuit breaker. The workbench is provided with several positioning holes, and each positioning hole has a plug-in post that engages with it. A placement plate is provided on the several plug-in posts. The placement plate has a placement groove corresponding to the connector, and the bottom of the placement groove has a strip-shaped hole for the circuit breaker insert to pass through.

[0006] By adopting the above technical solution, and setting up a protective box, calibration device body, and workbench, during the actual circuit breaker calibration operation, the operator first places the circuit breakers to be calibrated one by one into the placement slots of the placement plate to avoid subsequent misalignment during docking. Next, the plug-in pins are aligned with the positioning holes and inserted. During this process, the circuit breaker will slightly slide in the placement slot due to resistance from the contact connector. After insertion and positioning, a light press on the circuit breaker will allow its plates to stably connect with the connector without repeated adjustments, reducing operational difficulty and time consumption. After calibration, pulling the placement plate upwards will move all the calibrated circuit breakers upwards synchronously, allowing the plates to quickly separate from the connector, enabling multiple units to be disassembled at once, changing the cumbersome traditional method of disassembling one by one. During a batch calibration, the operator can remove the circuit breakers from the previous batch and simultaneously place the next batch of circuit breakers to be calibrated into another placement plate. After the current batch is completed, the placement plate can be directly replaced to start the next batch of calibration, reducing equipment waiting time and significantly improving overall calibration efficiency.

[0007] Furthermore, a connecting block is provided at the upper end of the plug-in post, the placement plate is connected to the connecting block, a guide rod is vertically provided on the connecting block, a sliding tube is slidably sleeved on the guide rod, and a pressure plate is provided on a number of sliding tubes.

[0008] By adopting the above technical solution, and setting up connecting blocks, guide rods, and pressure plates, when placing the circuit breaker into the placement slot for testing, the sliding tube must first be separated from the guide rod to avoid interference. When it is necessary to remove the placement plate, the sliding tube is sleeved on the corresponding guide rod, and the pressure plate contacts the top of several circuit breakers to prevent the circuit breaker from falling out of the placement slot when the placement plate is pulled upwards.

[0009] Furthermore, a first handle is provided on both sides of the placement plate. The first handle includes a first semi-circular column and a first L-shaped rod provided at both ends of the first semi-circular column. The end of the first L-shaped rod away from the first semi-circular column is connected to the placement plate. A second handle is provided on the pressure plate. The second handle includes a second semi-circular column and a second L-shaped rod provided at both ends of the second semi-circular column. The end of the second L-shaped rod away from the second semi-circular column is connected to the pressure plate.

[0010] By adopting the above technical solution and setting a first handle, when the pressure plate contacts the top of the circuit breaker, the first semi-cylinder contacts the second semi-cylinder to form a complete cylinder. When the staff holds this cylinder and pulls it, the distance between the pressure plate and the placement plate can be effectively limited, ensuring that the relative positions of the two are stable.

[0011] Furthermore, a mounting block is provided on the pressure plate corresponding to the sliding tube. A circular hole is vertically opened on the mounting block, and the circular hole is inserted into the guide rod. A mounting hole communicating with the circular hole is horizontally opened on the mounting block, and a spring plunger is provided in the mounting hole. An annular groove is opened on the guide rod, and the ball head of the spring plunger is engaged with the annular groove.

[0012] By adopting the above technical solution, an installation block and a spring plunger are set up. When the pressure plate moves down along the guide rod to contact the top of the circuit breaker, the ball head of the spring plunger will pop out under its own elastic force and get into the annular groove opened on the guide rod, thereby firmly locking the pressure plate in this position.

[0013] Furthermore, the upper edge of the guide rod is chamfered.

[0014] By adopting the above technical solution and setting a guide chamfer, when assembling the sliding tube and the guide rod, the guide chamfer can guide the sliding tube and the guide rod to align, avoiding assembly difficulties caused by misalignment between the sliding tube and the guide rod. At the same time, the guide chamfer squeezes the ball head of the spring plug, causing it to retract.

[0015] Furthermore, there are four positioning holes arranged in a rectangular array.

[0016] Furthermore, the length of the plug-in post is greater than the length of the circuit breaker's insert.

[0017] By adopting the above technical solution, it is ensured that when the circuit breaker is placed in the placement slot, its plates are always suspended and do not contact the platform where the support column is located, thereby effectively preventing the circuit breaker plates from being damaged by scratches or collisions during placement.

[0018] Furthermore, the edge of the placement slot opening is chamfered to provide guidance.

[0019] By adopting the above technical solution, the guide chamfer opened at the edge of the slot provides effective guidance for the placement of the circuit breaker, improving the convenience and efficiency of the placement.

[0020] Furthermore, a square opening is provided on one side of the protective box, and a storage box for storing and placing plates and pressure plates is slidably arranged inside the protective box.

[0021] By adopting the above technical solution, the storage box provides a dedicated storage space for accessories such as plates and pressure plates, effectively improving the space utilization and ease of use of the device.

[0022] Furthermore, there are two placement plates.

[0023] By adopting the above technical solutions, the continuity of operations can be guaranteed.

[0024] In summary, this utility model has the following beneficial effects: This application includes a protective box, a calibration device body, and a workbench. During actual circuit breaker calibration, the operator first places the circuit breakers to be calibrated one by one into the placement slots of the placement plate to avoid subsequent misalignment. Then, the plug-in pins are aligned with the positioning holes and inserted. During this process, the circuit breaker will slightly slide in the placement slot due to resistance from the contact connector. After insertion and positioning, a light press on the circuit breaker allows its inserts to connect stably with the connector without repeated adjustments, reducing operational difficulty and time consumption. After calibration, pulling the placement plate upwards will move all calibrated circuit breakers upwards synchronously, allowing the inserts to quickly separate from the connector, enabling multiple units to be disassembled at once, changing the cumbersome traditional method of disassembling one by one. During batch calibration, the operator can remove the previously tested circuit breakers and simultaneously place the next batch of circuit breakers to be tested into another placement plate. After the current batch is tested, the placement plate can be directly replaced to start the next batch of testing, reducing equipment waiting time and significantly improving overall calibration efficiency. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model; Figure 2 This is a schematic diagram of the structure of the protective box according to an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of the placement plate in an embodiment of this utility model; Figure 4 This is a schematic diagram of the structure of the pressure plate in an embodiment of this utility model.

[0026] In the diagram: 10. Protective box; 11. Workbench; 12. Positioning hole; 13. Storage box; 20. Calibration device body; 21. Connector; 30. Insertion post; 31. Placement plate; 32. Placement slot; 33. Strip hole; 34. Connecting block; 35. Guide rod; 36. First handle; 361. First semi-circular post; 362. First L-shaped rod; 37. Annular groove; 40. Sliding tube; 41. Pressure plate; 42. Second handle; 421. Second semi-circular post; 422. Second L-shaped rod; 43. Mounting block; 44. Spring plunger. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] like Figure 1-4As shown in the embodiment of this application, a thermal-magnetic circuit breaker calibration device for nuclear power plants is disclosed, including a protective box 10 and a calibration device body 20. The calibration device body 20 is disposed inside the protective box 10. A workbench 11 is disposed inside the protective box 10. The workbench 11 has several openings. The calibration device body 20 includes a connector 21 disposed in the opening for connection with the thermal circuit breaker. The workbench 11 has four positioning holes 12 arranged in a rectangular array. A plug-in post 30 is disposed in the positioning hole 12 for plugging and mating with it. A placement plate 31 is disposed on several plug-in posts 30. A placement groove 32 is disposed on the placement plate 31 corresponding to the connector 21. A strip hole 33 is disposed at the bottom of the placement groove 32 for the circuit breaker insert to pass through.

[0029] In actual calibration operations, operators can first place the circuit breakers to be calibrated one by one into the placement slots 32 of the placement plate 31. The limiting effect of the placement slots 32 ensures the initial position of the circuit breakers is accurate, preventing misalignment during subsequent connection. Then, the insertion pins 30 at the bottom of the placement plate 31 are aligned with the positioning holes 12 on the workbench 11 and inserted. During this process, the circuit breaker will experience slight sliding within the placement slots 32 due to resistance generated by contact with the connectors 21 on the workbench 11. After successful insertion and positioning, the operator only needs to gently press the circuit breaker to connect its plates to the connectors 21. The entire connection process eliminates the need for repeated adjustments to the circuit breaker position, significantly reducing operational difficulty and connection time. After the verification and testing are completed, the operator only needs to pull the placement plate 31 upwards. The upward movement of the placement plate 31 moves all the circuit breakers that have completed verification upwards simultaneously, allowing the circuit breaker plates to quickly separate from the connectors 21. This enables the simultaneous disassembly of multiple circuit breakers, completely changing the cumbersome process of disassembling circuit breakers one by one in traditional verification devices. During the verification and testing of a batch of circuit breakers, the operator can remove the circuit breakers from the previous batch that have completed testing from the previous placement plate 31, while simultaneously placing the next batch of circuit breakers to be tested into the placement slots 32 of the placement plate 31. After the current batch of testing is completed, the placement plate 31 can be directly replaced to begin the next batch of testing, effectively reducing equipment waiting time and significantly improving the overall efficiency of the verification operation.

[0030] Specifically, there are two placement plates 31 to ensure the continuity of the operation. The edge of the placement slot 32 is chamfered to provide effective guidance for the placement of the circuit breaker, improving the convenience and efficiency of placement. During the process of placing the circuit breaker into the placement slot 32, the chamfered guides the edge of the circuit breaker smoothly. Even if the operator slightly deviates from the placement position, the circuit breaker will automatically slide into the placement slot 32 under the guidance of the chamfer, eliminating the need for repeated adjustments and significantly reducing the difficulty of the placement operation. This reduces the placement time for each circuit breaker and improves overall work efficiency. The length of the plug-in post 30 is greater than the length of the circuit breaker's insert. This ensures that when the circuit breaker is placed into the placement slot 32, its insert remains suspended and does not contact the platform where the support post is located, effectively preventing damage to the circuit breaker's insert due to scratches or collisions during placement.

[0031] During setup, a connecting block 34 is provided at the upper end of the plug-in post 30. The placement plate 31 is connected to the connecting block 34. A guide rod 35 is vertically provided on the connecting block 34. A sliding tube 40 is slidably sleeved on the guide rod 35. A pressure plate 41 is provided on several sliding tubes 40. When placing the circuit breaker into the placement slot 32 for testing, the sliding tube 40 must first be separated from the guide rod 35 to avoid interference. When it is necessary to remove the placement plate 31, the sliding tube 40 is sleeved on the corresponding guide rod 35, and the pressure plate 41 contacts the top of several circuit breakers to prevent the circuit breaker from falling out of the placement slot 32 when the placement plate 31 is pulled upward. A first handle 36 is provided on both sides of the placement plate 31. The first handle 36 includes a first semi-circular post 361 and a first L-shaped rod 362 provided at both ends of the first semi-circular post 361. The end of the first L-shaped rod 362 away from the first semi-circular post is connected to the placement plate 31, and the rectangular surface of the first semi-circular post faces upward. A second handle 42 is provided on the pressure plate 41. The second handle 42 includes a second semi-circular column 421 and second L-shaped rods 422 located at both ends of the second semi-circular column 421. The end of the second L-shaped rod 422 away from the second semi-circular column is connected to the pressure plate 41. The rectangular surface of the second semi-circular column faces downward. When the flat pressure plate 41 contacts the top of the circuit breaker in the placement slot 32, the rectangular surface of the first semi-circular column contacts the rectangular surface of the second semi-circular column, so that the first and second semi-circular columns form a complete cylinder. When the operator holds this cylinder and pulls it, it can effectively limit the distance between the pressure plate 41 and the placement plate 31, ensuring the stability of their relative positions.

[0032] In the specific configuration, a mounting block 43 is provided on the pressure plate 41 corresponding to the sliding tube 40. The mounting block 43 has a vertically opening circular hole that engages with the guide rod 35. A horizontal mounting hole communicating with the circular hole is also provided on the mounting block 43, and a spring plunger 44 is installed within the mounting hole. An annular groove 37 is provided on the guide rod 35, and the ball head of the spring plunger 44 engages with the annular groove 37. When the pressure plate 41 moves downwards along the guide rod 35 until it contacts the top of the circuit breaker, the ball head of the spring plunger 44 will spring out under its own elastic force and engage with the annular groove 37 on the guide rod 35, thus securing the pressure plate 41 in this position. When it is necessary to unlock, the operator only needs to pull the pressure plate 41 upwards. Under the pulling force, the ball head of the spring plunger 44 will compress the spring and retract into the mounting hole, disengaging from the annular groove 37, allowing the pressure plate 41 to move upwards along the guide rod 35. The upper edge of the guide rod 35 has a guide chamfer. When assembling the sliding tube 40 and the guide rod 35, the guide chamfer guides the sliding tube 40 and the guide rod 35 to align, avoiding assembly difficulties caused by misalignment between the sliding tube 40 and the guide rod 35. Simultaneously, the guide chamfer presses against the ball head of the spring plug, causing it to retract.

[0033] The protective case 10 includes a case body with a lid hinged to it. A square opening is provided on one side of the case body. A storage box 13 for storing the placement plate 31 and pressure plate 41 is slidably disposed inside the protective case 10. The storage box 13 provides dedicated storage space for accessories such as the placement plate 31 and pressure plate 41, effectively improving the space utilization and ease of use of the device. The operation screen of the calibration device body 20 is located on the lid.

[0034] Before calibration begins, the calibration device 20 automatically scans the insertion status of connectors 21 into the thermal-magnetic circuit breakers. Unused connectors 21 are bypassed without affecting the overall testing. After setting the calibration current via the touchscreen, the internal constant current source outputs the corresponding current to the main circuit contacts of the thermal-magnetic circuit breakers. During power-on, the calibration device 20 scans the status of the auxiliary contacts of all thermal-magnetic circuit breakers in real time. When a thermal-magnetic circuit breaker trips, the tripping time and tripping channel number are recorded. Once all thermal-magnetic circuit breakers to be calibrated have tripped, the calibration device 20 automatically stops outputting. Calibration can also be manually stopped midway.

[0035] The operating principle of the thermal-magnetic circuit breaker calibration device for nuclear power plants in this embodiment is as follows: Open the cover of the protective box 10, take out the placement plate 31 and pressure plate 41 from the storage box 13, separate the sliding tube 40 from the guide rod 35, and simultaneously place the next batch of circuit breakers to be calibrated into the placement slot 32 of another placement plate 31 in advance. Align and insert the placement plate 31 containing the circuit breakers to be calibrated with the positioning hole 12 on the workbench 11 through the bottom insertion post 30, and then gently press the circuit breaker so that the circuit breaker insert passes through the strip hole 33 of the placement slot 32 and completes the connection with the connector 21. Set the calibration current on the operation screen of the calibration device body 20, and the constant current source of the calibration device body 20 outputs current to the main circuit of the circuit breaker. During the test, the device scans the status of the auxiliary contacts in real time, records the tripping time and channel number, and the device automatically stops outputting after all circuit breakers trip. After the test is completed, slide tube 40 is fitted onto guide rod 35 so that pressure plate 41 contacts the top of circuit breaker. At this time, the ball head of spring plunger 44 is inserted into the annular groove 37 of guide rod 35 to lock pressure plate 41. Then, hold the first and second handles 42 and pull upward to drive all circuit breakers to separate from connector 21 synchronously. After removal, replace with another pre-prepared placement plate 31 and repeat the above steps to continue the test.

[0036] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A calibration device for thermal-magnetic circuit breakers in nuclear power plants, comprising a protective enclosure (10) and a calibration device body (20) disposed within the protective enclosure (10), characterized in that: The protective box (10) is provided with a workbench (11), and the workbench (11) has several openings. The calibration device body (20) includes a connector (21) set in the opening for connection with the thermal circuit breaker. The workbench (11) is provided with several positioning holes (12), and the positioning holes (12) are provided with plug-in posts (30) that are plugged in and cooperate with them. A placement plate (31) is provided on several plug-in posts (30). A placement groove (32) is provided on the placement plate (31) corresponding to the connector (21). A strip hole (33) for the circuit breaker insert to pass through is provided at the bottom of the placement groove (32).

2. The thermal-magnetic circuit breaker calibration device for nuclear power plants according to claim 1, characterized in that: A connecting block (34) is provided at the upper end of the plug-in post (30). The placement plate (31) is connected to the connecting block (34). A guide rod (35) is vertically provided on the connecting block (34). A sliding tube (40) is slidably sleeved on the guide rod (35). A pressure plate (41) is provided on several of the sliding tubes (40).

3. The thermal-magnetic circuit breaker calibration device for nuclear power plants according to claim 2, characterized in that: The placement plate (31) is provided with a first handle (36) on both sides. The first handle (36) includes a first semi-circular column (361) and a first L-shaped rod (362) provided at both ends of the first semi-circular column (361). The end of the first L-shaped rod (362) away from the first semi-circular column is connected to the placement plate (31). The pressure plate (41) is provided with a second handle (42). The second handle (42) includes a second semi-circular column (421) and a second L-shaped rod (422) provided at both ends of the second semi-circular column (421). The end of the second L-shaped rod (422) away from the second semi-circular column is connected to the pressure plate (41).

4. The thermal-magnetic circuit breaker calibration device for nuclear power plants according to claim 3, characterized in that: The pressure plate (41) is provided with a mounting block (43) corresponding to the sliding tube (40). The mounting block (43) has a vertically opened circular hole, which is inserted into the guide rod (35). The mounting block (43) has a horizontally opened mounting hole communicating with the circular hole. A spring plunger (44) is provided in the mounting hole. The guide rod (35) has an annular groove (37), and the ball head of the spring plunger (44) is engaged with the annular groove (37).

5. A thermal-magnetic circuit breaker calibration device for nuclear power plants according to claim 4, characterized in that: The upper edge of the guide rod (35) has a guide chamfer.

6. The thermal-magnetic circuit breaker calibration device for nuclear power plants according to claim 1, characterized in that: The positioning holes (12) are four in number and arranged in a rectangular array.

7. The thermal-magnetic circuit breaker calibration device for nuclear power plants according to claim 1, characterized in that: The length of the plug post (30) is greater than the length of the circuit breaker's insert.

8. The thermal-magnetic circuit breaker calibration device for nuclear power plants according to claim 1, characterized in that: The edge of the groove (32) is chamfered to provide guidance.

9. A thermal-magnetic circuit breaker calibration device for nuclear power plants according to claim 1, characterized in that: The protective box (10) has a square opening on one side, and a storage box (13) for storing the placement plate (31) and pressure plate (41) is slidably arranged inside the protective box (10).

10. A thermal-magnetic circuit breaker calibration device for nuclear power plants according to claim 1, characterized in that: There are two placement plates (31).

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