Intelligent power grid self-throwing type comprehensive distribution box

Abstract

The application relates to the field of low-voltage distribution boxes, and specifically discloses an intelligent power grid self-throwing type comprehensive distribution box, which comprises a cabinet body, a double-power conversion switch is arranged in the cabinet body, the double-power conversion switch comprises two housings, three partition plates are fixedly connected in the housings, the partition plates divide the housings into four connecting chambers, two static contacts are symmetrically fixed in each of the connecting chambers, two mounting plates are slidably arranged in the connecting chambers, a moving contact is rotatably arranged on the mounting plate, the static contacts are located between the two moving contacts, the two static contacts are movably abutted at the two ends of the moving contact, the two static contacts are connected with external power sources and load devices respectively, and the housing further comprises a driving assembly arranged for driving the two mounting plates to move away from or close to the static contacts and a limiting piece arranged for limiting the moving contact. The application has the effect of improving the stability and safety of the distribution box during switching.

Description

Technical Field

[0001] This application relates to the field of low-voltage distribution box technology, and in particular to a smart grid automatic switching integrated distribution box. Background Technology

[0002] Automatic switching integrated distribution boxes are key equipment in the end-of-line power distribution systems of smart grids, widely used in important locations with high requirements for power supply continuity, such as industrial plants, commercial buildings, residential communities, hospitals, and transportation hubs. These distribution boxes can automatically switch to backup power to continue supplying power when the main power supply fails or is interrupted, ensuring the normal operation of the load equipment and avoiding serious consequences such as production interruptions, data loss, or safety accidents caused by unexpected power outages.

[0003] The existing automatic switching distribution box mainly consists of a cabinet, inside which a dual power transfer switch is fixedly connected. The incoming terminals of the dual power transfer switch are connected to the main power supply and the backup power supply respectively. The cabinet is also equipped with modules such as current transformers, fire monitoring modules, input / output circuit breakers, controllers, terminal blocks and surge protectors.

[0004] Dual-power transfer switches are mainly classified into plug-in type and snap-fit ​​type according to their contact structure. Plug-in type transfer switches use a knife-shaped blade design for the moving contact and a clamping structure for the stationary contact. When closing, the moving contact inserts into the stationary contact. Since there are two currents in the same direction on the moving contact, the clamping force is further increased when current flows, resulting in good electro-compensation effect and strong resistance to short-circuit current surges. Snap-fit ​​type transfer switches, on the other hand, use a forward snap-fit ​​structure where the moving and stationary contacts directly contact each other during closing.

[0005] For snap-action dual-power transfer switches, a strong electrodynamic repulsion force (i.e., Holm force) is generated between the moving and stationary contacts at the moment of closing contact or when a large short-circuit current is encountered. This repulsion force is proportional to the square of the current and can far exceed the contact spring pressure under short-circuit conditions, causing a sharp drop in contact pressure, a sudden increase in contact resistance, and high-frequency bouncing of the contacts, incomplete contact, or even complete repulsion. Although existing technologies attempt to suppress the repulsion force by increasing spring stiffness or using magnetic blowout structures, it is difficult to balance the instantaneously changing Holm force in real time. The bouncing process can easily cause arc erosion and contact welding, which can lead to permanent damage to the switch and threaten power supply safety in severe cases. For plug-in dual power transfer switches, during the closing process, when the moving contact (blade-shaped insert) is just inserted into the stationary contact (clamping finger), the contact only occurs at a localized tiny protrusion. The actual contact area is much smaller than the designed area, resulting in extremely high initial contact resistance. At the moment the current passes through, the contact material is prone to local melting, oxidation, or mechanical damage. After long-term use, the contact reliability decreases, and the thermal effect under high current will accelerate the aging of the contact. Therefore, improvements are urgently needed. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a smart grid automatic switching integrated distribution box.

[0007] The intelligent grid automatic switching integrated distribution box provided in this application adopts the following technical solution: A smart grid automatic switching integrated distribution box includes a cabinet with a dual power transfer switch inside. The dual power transfer switch includes two housings, and three partitions are fixedly connected inside each housing, dividing the interior of the housing into four connection chambers. Each connection chamber has two stationary contacts symmetrically fixedly connected to it. Two mounting plates are slidably arranged in each connection chamber, and moving contacts are rotatably arranged on the mounting plates. The two stationary contacts are located on both sides of the moving contacts, and the two stationary contacts are movably abutted against both ends of each moving contact. The two stationary contacts are respectively connected to an external power source and a load device. The housing also includes a driving component for driving the two mounting plates away from or towards the stationary contacts, and a limiting component for limiting the movement of the moving contacts.

[0008] By adopting the above technical solution, when the main power supply fails, the dual power switch switches to connect to the backup power supply. At this time, the stationary contact connected to the main power supply separates from the moving contact, while the stationary contact connected to the backup power supply engages with the moving contact. When the moving contact engages with the stationary contact, the drive assembly moves the two housings closer to the stationary contact, and the moving contacts on the two mounting plates abut against the top and bottom walls of the stationary contact, respectively. Since the two moving contacts clamp and abut the stationary contact, compared with the plug-in contacts in the prior art, the contact area between the moving and stationary contacts is effectively increased, the contact melting caused by excessive resistance during the contact process is effectively reduced, and the service life of the dual power switch is improved.

[0009] The internal partition of the housing divides the interior into four connection chambers. Since the four connection chambers are sealed spaces, they can effectively suppress the spread of electric arc when the moving and stationary contacts are broken, and eliminate electrical interference between adjacent stationary contacts, thereby improving the breaking safety and phase-to-phase insulation performance of the switch.

[0010] Since the two moving contacts are located at the top and bottom of the stationary contact respectively, and the moving contacts clamp and fix the stationary contact, when the power is on, current flows in the same direction between the two moving contacts. According to Ampere's law, the two moving contacts will generate mutual attraction. This force further enhances the clamping force of the moving contacts on the stationary contact, forming a current-driven dynamic self-locking effect, which effectively improves the stability and safety between the moving contacts and the stationary contacts.

[0011] When the drive assembly moves the mounting plate, the limiting component limits the moving contact, effectively preventing it from deflecting prematurely; it reduces the risk of a sudden increase in local resistance due to insufficient contact area or angular deviation, ensures reliable contact at the moment of closing, and improves the safety of the dual power supply transfer switch.

[0012] When the moving contact contacts the stationary contact or when the current fluctuates significantly, a Hall effect force is generated between the stationary and moving contacts due to the current fluctuation. This causes the moving contact to bounce, resulting in poor contact between the moving and stationary contacts. The magnitude of the Hall effect force is mainly related to the current and the effective contact area. By rotating the moving contact on the mounting plate and making its two ends abut against the two stationary contacts respectively, the contact area between the two ends of the moving contact and the two stationary contacts can be adjusted. By changing the distance between the rotation axis of the moving contact and the two stationary contacts, the Hall effect force generated at both ends of the moving contact can be canceled out through the lever principle. This effectively reduces the risk of moving contact bounce and improves the stability between the moving and stationary contacts.

[0013] Optionally, the drive assembly includes a threaded rod rotatably disposed within the housing. The threaded rod has two symmetrically arranged threaded segments with opposite directions of rotation and the same pitch. The two mounting plates are respectively threadedly adapted to the two threaded segments at both ends of the threaded rod. One end of the threaded rod passes through the housing, and a gear is coaxially fixed to the end of the threaded rod extending out of the housing. A rack that meshes with the gear is slidably disposed on the housing. The drive assembly also includes a drive component for driving the rack to move.

[0014] By adopting the above technical solution, the driving component moves the rack on the housing, the rack drives the gear to rotate, the gear drives the threaded rod to rotate, and the threaded rod drives the two mounting plates to move away from or towards the stationary contact simultaneously. When the mounting plate approaches the stationary contact, the limiting component restricts the moving contact to ensure that the moving contact does not deflect before contacting the stationary contact. The limiting component keeps the two moving contacts horizontal with the stationary contact. When the moving contact contacts the stationary contact, the limiting component unlocks the moving contact. If a short circuit occurs, according to the lever principle, the rotatable moving contact can reduce the bouncing of the moving contact. When the mounting plate moves away from the stationary contact, the limiting component restricts the moving contact again.

[0015] Optionally, the driving component includes a driving block fixed to the rack, a rotating shaft fixed to the driving block, a first connecting rod and a second connecting rod provided on the housing, one end of the first connecting rod and the second connecting rod rotatably disposed on the housing, and the other end of the first connecting rod and the second connecting rod both disposed on the rotating shaft, a driving hole provided on the first connecting rod and the second connecting rod, the rotating shaft passing through the driving hole and being slidable along it, a driving rod disposed inside the housing, one end of the driving rod fixed to the rotating shaft, the driving rod being located between the first connecting rod and the second connecting rod, a driving disk rotatably disposed inside the housing, the end of the driving rod away from the rotating shaft rotatably disposed on the driving disk, and a power component for driving the driving disk to rotate inside the housing.

[0016] By adopting the above technical solution, when the driving contact moves, the power component drives the driving disk to rotate, the driving disk drives the driving rod to move, the driving rod drives the driving block to move through the rotating shaft, the driving block drives the rack to move on the housing, and the rotating shaft simultaneously drives the first connecting rod and the second connecting rod to rotate. Since the first connecting rod and the second connecting rod are provided with driving holes, when the driving rod drives the rotating shaft to move, the rotating shaft moves within the driving holes of the first connecting rod and the second connecting rod.

[0017] Optionally, a movable plate is slidably disposed on the second connecting rod, and an elastic element is disposed between the second connecting rod and the movable plate, wherein the movable plate is movably fitted with the rotating shaft.

[0018] By adopting the above technical solution, when the drive block and the rotating shaft move on the housing, the rotating shaft abuts against the moving plate on the second connecting rod. When the moving contact and the stationary contact are pressed together, the elastic element is squeezed and the rack is locked by the first connecting rod and the second connecting rod, thereby making the moving contact and the stationary contact tightly pressed together. This reduces the risk of the moving contact jumping and causing poor contact between the moving contact and the stationary contact under short circuit and large current change conditions.

[0019] Optionally, a guide rod is fixedly connected inside the housing, and both mounting plates are slidably mounted on the guide rod.

[0020] By adopting the above technical solution, when the threaded rod drives the two mounting plates to move, the guide rod inside the housing improves the stability of the mounting plate movement.

[0021] Optionally, the limiting member includes a rotating rod fixed to the moving contact, both ends of the rotating rod passing through the mounting plate, and both ends of the rotating rod being coaxially fixed to a limiting disk. A plurality of limiting grooves are evenly spaced on the peripheral wall of the limiting disk. A limiting plate is elastically and slidably provided on the mounting plate, and a limiting block that is inserted and adapted to the limiting groove is fixed on the limiting plate.

[0022] By adopting the above technical solution, when the two moving contacts are not in contact with the stationary contacts, the limiting block on the limiting plate is inserted into the limiting groove on the limiting disk. The limiting block locks the rotating rod, keeping the moving contacts parallel to the stationary contacts, thereby reducing the risk of the moving contacts tilting and contacting the stationary contacts, which would result in excessive resistance during contact and damage to both the moving and stationary contacts. When the two mounting plates move to the point where the moving contacts and stationary contacts abut, the two limiting plates abut against each other, and the limiting block on the limiting plate separates from the limiting groove, allowing the moving contacts to rotate on the mounting plate, thereby reducing the risk of the moving contacts jumping.

[0023] Optionally, two sets of arc-extinguishing grids are fixedly connected to the partition plate, and the two sets of arc-extinguishing grids are located on both sides of the moving contact.

[0024] By adopting the above technical solution, the arc-extinguishing grid extinguishes the arc generated when the moving contact and the stationary contact separate, reduces the temperature during the switching process of the dual power supply transfer switch, and improves the stability and installability of the device.

[0025] Optionally, the housing is provided with a sliding groove, and the rack and the drive block are slidably disposed in the sliding groove.

[0026] By adopting the above technical solution, the groove on the housing provides a basis for the movement of the rack and drive block.

[0027] In summary, this application includes at least one of the following beneficial technical effects: 1. By setting a stationary contact inside the housing and sliding a mounting plate inside the housing, a moving contact is rotatably mounted on the mounting plate. In the event of a short circuit or a large change in current, according to the lever principle, the Holm forces generated at both ends of the moving contact cancel each other out. Compared with the snap-fit ​​contact in the prior art, this effectively reduces the risk of arcing and melting of the moving contact due to bouncing, and effectively improves the stability and safety of the dual power transfer switch and the distribution box. 2. When the moving contact contacts the stationary contact, the power component drives the drive rod to move, the drive rod drives the rack to move, the rack drives the threaded rod to rotate, and the threaded rod drives the two mounting plates to approach the stationary contact. The moving contact on the mounting plate clamps and abuts the stationary contact. Compared with the plug-in contact in the existing technology, this reduces the risk of high resistance when the moving contact and stationary contact are plugged in, which could lead to local melting of the moving contact and stationary contact. This improves the safety and service life of the dual power switch and the distribution box. 3. Before the moving contact makes contact with the stationary contact, the limiting block is inserted into the limiting groove of the limiting plate to keep the moving contact parallel to the stationary contact. When the moving contact makes contact with the stationary contact, the limiting plate moves away from the limiting plate to unlock the moving contact. This effectively reduces the risk of premature deflection of the moving contact, which leads to changes in the contact angle and improves the stability when the moving contact makes contact with the stationary contact. 4. The three partitions inside the housing isolate adjacent moving and stationary contacts, placing them in sealed connection chambers. This effectively reduces electrical interference between adjacent contacts. Additionally, the arc-extinguishing grids on the partitions extinguish the arc generated when the moving and stationary contacts separate, effectively improving the stability of the dual power transfer switch and distribution box. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application; Figure 2 This is a partial structural schematic diagram of a dual power supply transfer switch, used in an embodiment of this application. Figure 3 This is a partial structural schematic diagram of the driving component used in an embodiment of this application; Figure 4 This is a schematic diagram illustrating a portion of the internal structure of the housing, as shown in an embodiment of this application. Figure 5 This is a partial structural diagram of the mounting plate used in an embodiment of this application; Figure 6 This is a partial structural diagram of the moving contact and the stationary contact used in the embodiments of this application.

[0029] Reference numerals: 1. Cabinet; 2. Dual power supply changeover switch; 3. Housing; 31. Partition; 32. Connecting chamber; 33. Stationary contact; 34. Moving contact; 35. Slide groove; 36. Mounting plate; 4. Drive assembly; 41. Threaded rod; 411. Guide rod; 42. Gear; 43. Rack; 44. Drive component; 441. Drive block; 442. Rotating shaft; 443. First connecting rod; 444. Second connecting rod; 445. Drive hole; 446. Drive rod; 447. Drive disc; 448. Power component; 51. Moving plate; 52. Elastic component; 6. Limiting component; 61. Rotating rod; 62. Limiting disc; 63. Limiting groove; 64. Limiting plate; 65. Limiting block; 7. Arc extinguishing grid. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0031] This application discloses an automatic switching integrated distribution box for smart grids. (Refer to...) Figure 1-4The smart grid automatic transfer switch integrated distribution box includes a cabinet 1, inside which is installed a controller, which can be a dedicated smart controller. A dual power transfer switch 2 is fixedly connected inside the cabinet 1. The dual power transfer switch 2 includes two housings 3, which are fixed together by long pins. Three partitions 31 are fixedly connected inside each housing 3. Two sets of arc-extinguishing grids 7 are fixedly connected to each of the three partitions 31. Each set of arc-extinguishing grids 7 includes multiple evenly spaced grid pieces. The grid pieces can be made of copper-plated steel, copper alloy, copper, steel, etc. The three partitions 31 divide the interior of the housing 3 into four connection chambers 32. Four sets of stationary contacts 33 are fixedly connected inside the housing 3. These four sets of stationary contacts 33 are respectively connected to the live wire and neutral wire (A, B, C, N). Each set of stationary contacts 33 includes two stationary contacts 33 that penetrate the housing 3. One end of each stationary contact 33 is connected to the power supply, and the other end is connected to an external load. The sets of stationary contacts 33 on the two housings 3 are respectively connected to the main power supply and the backup power supply. The housing 3 is equipped with a mechanism for detecting the main power supply and the backup power supply. The power supply uses voltage and current transformers, which are electrically connected to the controller. Four sets of mounting plates 36 are slidably arranged inside the housing 3, corresponding one-to-one with four connecting chambers 32. Each set of mounting plates 36 includes two mounting plates 36, located at the top and bottom of the stationary contact 33 respectively. The mounting plates 36 are movably fitted against the peripheral wall of the connecting chamber 32. Moving contacts 34 are rotatably arranged on the mounting plates 36, located at the top and bottom of the stationary contact 33 respectively. The two ends of the moving contacts 34 are movably fitted against the two stationary contacts 33 respectively. The housing 3 and mounting plates 36 can be made of glass fiber reinforced unsaturated polyester resin, engineering plastics, etc. The housing 3 contains a drive assembly 4 for moving the moving contacts 34 and a limiting member 6 for limiting the movement of the moving contacts 34.

[0032] When the main power supply fails, the dual power transfer switch 2 in the distribution box switches to connect with the backup power supply. The drive assembly 4 inside the housing 3 connected to the backup power supply drives the two mounting plates 36 to move, and brings the moving contact 34 on the two mounting plates 36 close to the stationary contact 33 and abuts against the stationary contact 33. The limiting member 6 keeps the moving contact 34 parallel to the stationary contact 33 during the movement, effectively reducing the risk of premature deflection of the moving contact 34 during the movement, resulting in insufficient contact area or angular deviation. This reduces the risk of a sudden increase in local resistance when the moving contact 34 contacts the stationary contact 33, ensuring the safety of the dual power transfer switch 2 closing and the stability of the distribution box.

[0033] Since the mounting plate 36 is located at the bottom and top of the stationary contact 33 respectively, the moving contact 34 on the mounting plate 36 clamps and presses against the stationary contact 33. Compared with the plug-in contact in the prior art, this effectively increases the contact area between the moving contact 34 and the stationary contact 33, reduces the problem of contact melting caused by excessive resistance during the contact process, and improves the service life of the dual power switch.

[0034] The housing 3 has three partitions 31, and an arc-extinguishing grid 7 is fixed on the partitions 31. Compared with the plug-in contacts in the prior art, this solution forms four relatively closed connection chambers 32, which effectively suppresses the arc propagation generated when the moving contact 34 and the stationary contact 33 are broken, reduces the electrical interference between adjacent moving contacts 34 and stationary contacts 33, and improves the safety and stability of the distribution box.

[0035] Furthermore, since the two moving contacts 34 are located at the top and bottom of the stationary contact 33 respectively, when energized, the current direction on the two moving contacts 34 is the same. According to Ampere's law, the two moving contacts 34 generate mutual attraction, which further enhances the clamping force of the moving contacts 34 on the stationary contact 33, forming a current-driven self-locking effect, effectively improving the stability between the moving contacts 34 and the stationary contact 33, and improving the safety of the distribution box.

[0036] When the moving contact 34 and the stationary contact 33 are pressed together, if the contact pressure is insufficient during closing or when a large current is flowing, a Holm force will be generated between the moving contact 34 and the stationary contact 33. This Holm force may cause problems such as the moving contact 34 bouncing, poor contact, or even welding. By rotating the moving contact 34 on the mounting plate 36, with both ends of the moving contact 34 abutting against the two stationary contacts 33, a lever can be formed between the moving contact 34 and the stationary contacts 33. If the contact areas between the moving contact 34 and the two stationary contacts 33 are S1 and S2 respectively, the generated Holm forces are F1 and F2, and the corresponding lever arms are L1 and L2. Based on the lever principle, L1... F1=L2 F2, and by changing the effective contact area between the moving contact 34 and the two stationary contacts 33 or changing the lever arm between the moving contact 34 and the two stationary contacts 33, the torque generated at both ends of the moving contact 34 by the Holm force can be partially or completely canceled. The resultant force at both ends of the moving contact 34 is borne by the mounting plate 36 and the drive assembly 4. At the same time, since the current direction is the same, the two moving contacts 34 generate an Ampere force between them, which further locks the moving contact 34 to the stationary contact 33, thereby reducing the problem of the moving contact 34 jumping during a short circuit, and effectively improving the stability and safety of the distribution box.

[0037] Reference Figure 3-4The drive assembly 4 includes four threaded rods 41 rotatably disposed within the housing 3. Each of the four threaded rods 41 corresponds one-to-one with a connecting chamber 32. Each threaded rod 41 has two symmetrically arranged threaded segments with opposite directions of rotation and the same pitch. Two mounting plates 36 are threadedly connected to the threaded rods 41. The two mounting plates 36 are symmetrically arranged and correspond to the two threaded segments on the threaded rods 41. One end of each threaded rod 41 penetrates the housing 3, and a gear 42 is coaxially fixed to the end of the threaded rod 41 penetrating the housing 3. Four guide rods 411 are fixedly disposed within the housing 3. Each of the four guide rods 411 corresponds one-to-one with a threaded rod 41. The mounting plates 36 are slidably disposed on the guide rods 411. A groove 35 is provided on the housing 3. A rack 43 is slidably disposed on the housing 3 and is adapted to slide in the groove 35. The rack 43 meshes with the gear 42. The drive assembly 4 also includes a drive component 44 for driving the rack 43 to move.

[0038] When the main power supply fails, the voltage transformer and current transformer inside the distribution box detect the voltage and current changes of the main power supply. The controller inside the distribution box controls the start of the drive assembly 4. The drive assembly 44 drives the rack 43 to move along the slide groove 35 on the housing 3. The rack 43 meshes with the gear 42, driving the threaded rod 41 to rotate. The threaded rod 41 drives the mounting plate 36 inside the housing 3 connected to the backup power supply to move, and brings the moving contact 34 on the mounting plate 36 closer to the stationary contact 33, and abuts against the top and bottom of the stationary contact 33. The guide rod 411 inside the housing 3 improves the stability of the movement of the mounting plate 36. At the same time, the controller controls the drive assembly 4 to move the moving contact 34 inside the housing 3 connected to the main power supply away from the stationary contact 33. The arc-extinguishing grid 7 inside the housing 3 extinguishes the arc generated between the moving contact 34 and the stationary contact 33, thereby completing the switching.

[0039] Reference Figure 3-6The driving component 44 includes a driving block 441 welded or integrally formed on the rack 43. A rotating shaft 442 is fixedly connected to the driving block 441. A first connecting rod 443 and a second connecting rod 444 are rotatably arranged on the housing 3. One end of the first connecting rod 443 and the second connecting rod 444 are rotatably arranged on the housing 3, and the other end of the first connecting rod 443 and the second connecting rod 444 are rotatably arranged on the rotating shaft 442. A driving hole 445 is opened at the end of the first connecting rod 443 and the second connecting rod 444 near the rotating shaft 442. The rotating shaft 442 passes through the driving hole 445. A power component 448 is arranged inside the housing 3. The power component 448 can be an excitation coil or a motor. The power component 448 is electrically connected to the controller. A driving disk 447 is fixedly connected to the output end of the power component 448. A driving rod 44 is rotatably arranged on the driving disk 447. 6. The end of the drive rod 446 away from the drive disc 447 is rotatably mounted on the rotating shaft 442. The drive rod 446 is located between the first connecting rod 443 and the second connecting rod 444. A movable plate 51 is slidably mounted on the second connecting rod 444. The movable plate 51 has a movable hole that is adapted to be inserted into the second connecting rod 444. An elastic element 52 is sleeved on the second connecting rod 444. The elastic element 52 can be a spring. One end of the elastic element 52 is fixed to the second connecting rod 444, and the other end of the elastic element 52 is fixed to the movable plate 51. The movable plate 51 is movably fitted with the rotating shaft 442. The drive rod 446 inside the two housings 3 can be driven by a power element 448, but the position of the drive rod 446 needs to be staggered so that the moving contact 34 and the stationary contact 33 inside the two housings 3 are respectively in a mating state and a separated state.

[0040] The controller starts the power component 448, which drives the drive disk 447 to rotate. The drive disk 447 drives the drive rod 446 to move. The drive rod 446 drives the drive block 441 and rack 43 to move via the rotating shaft 442. The drive rod 446 also drives the first connecting rod 443 and the second connecting rod 444 to rotate. The rotating shaft 442 moves relative to the drive holes 445 of the first connecting rod 443 and the second connecting rod 444. The peripheral wall of the rotating shaft 442 abuts against the moving plate 51 on the second connecting rod 444 and pushes the moving plate 51 to move on the second connecting rod 444. The moving plate 51 compresses the elastic element 52. When the moving contact 34 abuts against the stationary contact 33, the elastic element 52 on the second connecting rod 444 makes the moving contact 34 and the stationary contact 33 press tightly together, improving the locking effect of the moving contact 34 on the stationary contact 33 and reducing the risk of bouncing between the moving contact 34 and the stationary contact 33.

[0041] Reference Figure 5The limiting component 6 includes a rotating rod 61 rotatably mounted on the mounting plate 36, a moving contact 34 fixedly connected to the rotating rod 61, both ends of the rotating rod 61 penetrating the mounting plate 36, and both ends of the rotating rod 61 are coaxially fixedly connected to a limiting disk 62. The limiting disk 62 is provided with multiple limiting grooves 63 evenly spaced along the circumferential direction. A sliding rod is slidably mounted on the side wall of the mounting plate 36, and a limiting plate 64 is fixedly connected to one end of the sliding rod. A spring is sleeved on the sliding rod. A torsion spring can be provided at the rotatable connection between the rotating rod 61 and the mounting plate 36. A limiting block 65 is integrally formed on the limiting plate 64 and is adapted to be inserted into the limiting groove 63.

[0042] When the moving contact 34 and the stationary contact 33 are pressed together, the ends of the two mounting plates 36 abut together, the sliding rods on the two mounting plates 36 abut together, and the limiting plate 64 moves away from the limiting disk 62. The limiting block 65 on the limiting plate 64 moves away from the limiting groove 63, thereby unlocking the rotating rod 61. When the mounting plate 36 drives the moving contact 34 to separate from the stationary contact 33, under the action of the spring force, the limiting block 65 on the limiting plate 64 inserts into the limiting groove 63 of the limiting disk 62, so that the moving contact 34 and the stationary contact 33 remain parallel, thereby reducing the problem of deflection of the moving contact 34 before contacting the stationary contact 33 and improving the stability when the moving contact 34 and the stationary contact 33 are switched.

[0043] The implementation principle of the intelligent grid automatic switching integrated distribution box in this application embodiment is as follows: When the dual power transfer switch 2 switches, the power component 448 drives the drive disk 447 to rotate, the drive disk 447 drives the drive rod 446 to move, the drive rod 446 drives the drive block 441 and rack 43 to move through the rotating shaft 442, the rack 43 drives the gear 42 to rotate, the gear 42 drives the threaded rod 41 to rotate, the threaded rod 41 drives the two mounting plates 36 to move, the mounting plates 36 drive the moving contact 34 to abut against the stationary contact 33, and the drive rod 446 simultaneously drives the first connecting rod 443 and The second connecting rod 444 rotates, and the rotating shaft 442 abuts against the moving plate 51 on the second connecting rod 444, pushing the moving plate 51 to move on the second connecting rod 444. The elastic element 52 on the second connecting rod 444 locks the rack 43. The mounting plate 36 drives the two moving contacts 34 to clamp the stationary contact 33. Compared with the plug-in contacts in the prior art, this effectively reduces the problems of local heat melting caused by the small contact area and high resistance when the moving contact 34 and the stationary contact 33 come into contact, thus effectively improving the stability and safety of the distribution box.

[0044] When the mounting plate 36 drives the moving contact 34 to contact the stationary contact 33, the limiting block 65 on the limiting plate 64 inserts into the limiting groove 63 on the limiting plate 62 to lock the moving contact 34, reducing the risk of premature deflection of the moving contact 34 and the stationary contact 33, and improving the stability of the dual power transfer switch 2 and the distribution box.

[0045] When a short circuit or a large change in current occurs, the two ends of the moving contact 34 abut against the two stationary contacts 33. The Holm force generated at the two ends of the moving contact 34 is canceled out by the lever principle, since the moving contact 34 is rotatably mounted on the mounting plate 36. Compared with the snap-fit ​​contact in the prior art, this effectively reduces the risk of the moving contact 34 jumping, which could lead to contact burning or melting. This effectively improves the safety and stability of the dual power transfer switch and the distribution box.

[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A smart grid automatic transfer switch integrated distribution box, comprising a cabinet (1), wherein a dual power transfer switch (2) is provided inside the cabinet (1), characterized in that: The dual power supply changeover switch (2) includes two housings (3). Three partitions (31) are fixed inside the housings (3). The partitions (31) divide the interior of the housings (3) into four connecting chambers (32). Two stationary contacts (33) are symmetrically fixed inside each connecting chamber (32). Two mounting plates (36) are slidably arranged inside the connecting chambers (32). Moving contacts (34) are rotatably arranged on the mounting plates (36). The two stationary contacts (33) are located on both sides of the moving contacts (34). The two stationary contacts (33) are movably abutted against the two ends of each moving contact (34). The two stationary contacts (33) are connected to an external power supply and a load device, respectively. The housings (3) also include a drive assembly (4) for driving the two mounting plates (36) away from or closer to the stationary contacts (33) and a limiting member (6) for limiting the moving contacts (34).

2. The smart grid automatic switching integrated distribution box according to claim 1, characterized in that: The drive assembly (4) includes a threaded rod (41) rotatably disposed within the housing (3). Two threaded segments with opposite directions and the same pitch are symmetrically disposed on the threaded rod (41). The two mounting plates (36) are respectively threadedly adapted to the two threaded segments on the threaded rod (41). One end of the threaded rod (41) penetrates the housing (3), and a gear (42) is coaxially fixed to the end of the threaded rod (41) extending out of the housing (3). A rack (43) that meshes with the gear (42) is slidably disposed on the housing (3). The drive assembly (4) also includes a drive member (44) that drives the rack (43) to move.

3. The smart grid automatic switching integrated distribution box according to claim 2, characterized in that: The driving component (44) includes a driving block (441) fixedly connected to the rack (43), a rotating shaft (442) fixedly connected to the driving block (441), a first connecting rod (443) and a second connecting rod (444) provided on the housing (3), one end of the first connecting rod (443) and the second connecting rod (444) being rotatably mounted on the housing (3), and the other end of the first connecting rod (443) and the second connecting rod (444) being mounted on the rotating shaft (442), and a driving hole (445) being provided on both the first connecting rod (443) and the second connecting rod (444). The rotating shaft (442) passes through the driving hole (445) and can slide along it. A driving rod (446) is provided inside the housing (3). One end of the driving rod (446) is fixed to the rotating shaft (442). The driving rod (446) is located between the first connecting rod (443) and the second connecting rod (444). A driving disk (447) is rotatably provided inside the housing (3). One end of the driving rod (446) away from the rotating shaft (442) is rotatably provided on the driving disk (447). A power component (448) for driving the driving disk (447) to rotate is provided inside the housing (3).

4. The smart grid automatic switching integrated distribution box according to claim 3, characterized in that: A movable plate (51) is slidably disposed on the second connecting rod (444), and an elastic element (52) is disposed between the second connecting rod (444) and the movable plate (51). The movable plate (51) is movably fitted with the rotating shaft (442).

5. A smart grid automatic transfer switch integrated distribution box according to claim 1, characterized in that: A guide rod (411) is fixedly connected inside the housing (3), and both mounting plates (36) are slidably disposed on the guide rod (411).

6. A smart grid automatic transfer switch integrated distribution box according to claim 1, characterized in that: The limiting member (6) includes a rotating rod (61) fixed to the moving contact (34). Both ends of the rotating rod (61) pass through the mounting plate (36), and both ends of the rotating rod (61) are coaxially fixed to a limiting disk (62). A plurality of limiting grooves (63) are evenly spaced on the peripheral wall of the limiting disk (62). A limiting plate (64) is elastically and slidably provided on the mounting plate (36). A limiting block (65) that is inserted and adapted to the limiting groove (63) is fixed on the limiting plate (64).

7. A smart grid automatic switching integrated distribution box according to claim 1, characterized in that: Two sets of arc-extinguishing grids (7) are fixedly connected to the partition (31), and the two sets of arc-extinguishing grids (7) are located on both sides of the moving contact (34).

8. A smart grid automatic transfer switch integrated distribution box according to claim 3, characterized in that: The housing (3) has a groove (35) and the rack (43) and the drive block (441) are slidably disposed in the groove (35).

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