Modularized high-low voltage switchgear

Abstract

The invention relates to the technical field of switches, in particular to modular high-low voltage switch equipment which comprises a switch cabinet, a chassis handcart, moving contacts, static contacts, an inner supporting assembly, a pushing assembly and an inner supporting plate, the chassis handcart is installed in the switch cabinet in a sliding mode, and the moving contacts are fixedly installed on the chassis handcart; a plurality of static contacts are installed in the switch cabinet, an inner supporting assembly is arranged in the moving contact, the inner supporting plate is connected with the inner supporting assembly, the pushing assembly and the chassis handcart move in the same direction, when the pushing assembly moves, the inner supporting assembly pushes the inner supporting plate to move, and when the inner supporting plate moves, the contact piece slides on the installation base in a limited mode. When the moving contact is matched with the static contact, the inner supporting plate supports the moving contact open, damage caused by collision between the moving contact and the static contact when the handcart is manually operated to move is avoided, and meanwhile safety accidents caused by electric arcs generated when the moving contact and the static contact are connected are prevented.

Description

Technical Field

[0001] The present invention relates to the field of switch technology, in particular to a modular high and low voltage switch device. Background Art

[0002] With the rapid urbanization and construction of power grids, power systems have become widely popular. As a key component in power transmission and distribution systems, trolley-type switchgear plays a role in switching, controlling, and protecting power transmission and distribution. Trolley-type switchgear is a modular switchgear cabinet with three modules within the cabinet: a mobile trolley, a busbar compartment, and a cable compartment. The mobile trolley houses components such as circuit breakers and lightning arresters, while the busbar compartment houses components such as mutual inductors and transformers. The cable compartment neatly arranges various connecting cables. The movement of the trolley on the switchgear controls the connection and disconnection of the circuit breaker with the busbar and cables. When the moving contact on the trolley contacts the static contact in the switchgear, the power system is in operation. When the moving contact moves away from the static contact, the power system is disconnected. Maintenance of the switchgear requires only replacing the trolley, which can shorten maintenance outages. However, manual trolley movement makes it difficult to control the trolley's speed during circuit connection, which can lead to collisions between the moving and static contacts, causing damage.

[0003] In order to avoid the possibility of collision between the moving contact and the static contact when the manual operation trolley moves to make the moving contact and the static contact cooperate, thereby reducing the service life of the moving contact and the static contact, the invention patent with application number CN202410876746.2 provides a switch cabinet. The invention is to provide a cabinet door hinged at the front end of the cabinet body of the switch cabinet, and the cabinet body is provided with a static contact and a trolley assembly. The trolley assembly includes a trolley frame, a trolley and a circuit breaker. The circuit breaker is provided with a moving contact. The propulsion mechanism is provided on the trolley frame. The propulsion mechanism includes a first drive assembly and a second drive assembly. The first drive assembly and the second drive assembly both include a screw, a sleeve and a slide. The first drive assembly The pitch of the screw in the assembly is greater than the pitch of the screw in the second drive assembly. The protective mechanism is used to adjust the connection state between the slide and the sleeve. The propulsion mechanism makes the trolley move slower in the second half of the stroke close to the static contact, reducing the collision force when the moving contact is connected to the static contact. At the same time, a protective mechanism is provided, which can automatically disconnect the connection between the trolley and the propulsion mechanism when the movement of the trolley encounters resistance, to prevent the trolley from continuing to move and causing further damage. However, the moving contact is still inserted into the static contact, and the connection between the moving contact and the static contact may still collide. The collision may cause the moving contact to tilt, resulting in poor contact between the moving and static contacts, affecting the normal operation of the switch cabinet.

[0004] Therefore, in order to avoid damage caused by collision between the moving contact and the static contact when the manual trolley is moved, and to prevent safety accidents caused by arcing when the moving contact and the static contact are connected, a modular high and low voltage switchgear is proposed. Summary of the Invention

[0005] The object of the present invention is to provide a modular high and low voltage switchgear. In order to avoid damage caused by collision between the moving contact and the static contact when the manual operation trolley is moved, and to prevent arcing when the moving and static contacts are connected, an inner support plate is provided inside the moving contact to open the moving contact before the moving contact and the static contact are engaged. When the moving contact and the static contact are ready to contact and engage, multiple contact pieces fasten the end of the static contact, thereby avoiding multiple collisions between the moving contact and the static contact when the moving contact and the static contact are engaged and causing damage, and reducing the number of maintenance times of the switch cabinet.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A modular high and low voltage switchgear comprises a switch cabinet, a chassis trolley, a moving contact, a static contact, an inner support assembly, a pushing assembly and an inner support plate. The switch cabinet is provided with three modules: an upper door, a middle door and a lower door. The chassis trolley is slidably mounted in the middle door of the switch cabinet. A plurality of contact arms are mounted on the chassis trolley. The chassis trolley is connected to the switch cabinet through a lead screw. A plurality of moving contacts are correspondingly mounted at the ends of the plurality of contact arms. The moving contact comprises a mounting seat, a contact piece and a clamping spring. A plurality of contact pieces are mounted in a circumferential array on the mounting seat. The part can slide within the upper limit of the mounting seat, the tightening spring is sleeved on multiple contact pieces, multiple insulating covers corresponding to the contact arms are installed inside the switch cabinet, the static contact is fixedly installed in the insulating cover, a cylindrical rod is fixedly installed on the end of the contact arm, an inner support assembly is provided on the cylindrical rod, the inner support plate is connected to the inner support assembly, the pushing assembly is connected to the switch cabinet through a screw, the pushing assembly moves in the same direction as the chassis trolley, and when the pushing assembly moves, the inner support assembly pushes the inner support plate to move, and the contact piece swings on the mounting seat through the movement of the inner support plate.

[0008] The chassis trolley is slidably installed in the middle door of the switch cabinet, and the circuit breaker is set on the chassis trolley. The busbar room and cable room are respectively located in the upper door and lower door of the switch cabinet. The circuit breaker can be connected to the busbar and cable by controlling the movement of the chassis trolley to connect the moving contact with the static contact. When the moving contact on the chassis trolley has been fully inserted into the static contact in the switch cabinet and ensures good contact, the circuit breaker can perform the opening and closing operations to ensure the normal operation of the power system. When the chassis trolley needs to be repaired, the switch cabinet door has not been opened yet, and the moving contact and the static contact are first moved away by the screw drive. A distance is set, and appropriate locking is performed on the track inside the switch cabinet. The chassis trolley has not left the switch cabinet. Then, the switch cabinet door is opened, and the screw is turned again to completely separate the chassis trolley from the switch cabinet. The chassis trolley can be inspected as a whole. Multiple contact arms are set to cylindrical shape. The contact arms are used to electrically connect the moving contact and the circuit breaker. The tightening spring is set to circular shape. Multiple contact pieces are wrapped by the tightening spring to form a cylindrical shape. The static contact is also set to a cylindrical shape. Under the action of the tightening spring, the cylinder formed by the multiple contact pieces can wrap and clamp the static contact to ensure good contact between the moving contact and the static contact. The insulating cover is set to a cylindrical shape, and the inner diameter of the insulating cover is larger than the outer diameter of the cylindrical contact arm. When the moving contact cooperates with the static contact, the contact arm can be inserted into the insulating cover as a whole. The cylindrical rod and the contact arm are coaxially installed on the end face of the contact arm. The cross-sectional radius of the cylindrical rod is smaller than the cross-sectional radius of the contact arm. It is located inside the cylinder surrounded by multiple contact pieces. The pushing component and the chassis trolley are connected to the switch cabinet through the same screw. When the staff turns the screw, the pushing component will move in the same direction as the chassis trolley. When the pushing component moves to the set position, it will push the inner support component to move. When the inner support component moves, it pushes the chassis trolley to make the moving contact and Before the static contact mates, the inner support assembly will push the inner support plate to move. The movement of the inner support plate will stretch out multiple contact pieces. Multiple contact pieces slide at the upper limit of the mounting seat. The inner diameter of the cylinder formed by the multiple contact pieces becomes larger. When the moving contact and the static contact are ready to contact and mate, the pushing assembly will disengage from the contact with the inner support assembly, and the inner support plate will return to its initial position. Under the action of the tightening spring, the contact piece will slide and reset. Multiple contact pieces will fasten the end of the static contact, avoiding relative collision between the moving and static contacts when the moving contact and the static contact are mated and connected, reducing the probability of safety accidents caused by the collision of the moving and static contacts, and reducing the number of maintenance times of the switch cabinet.

[0009] Preferably, the inner support assembly includes a cylindrical seat, a long hinged rod and a short hinged rod. The cylindrical seat is slidably mounted on the cylindrical rod. One end of the long hinged rod is hinged to one end of the inner support plate, and the other end is hinged to the cylindrical seat. One end of the short hinged rod is hinged to one end of the inner support plate, and the other end is hinged to the cylindrical rod. Three inner support plates are arranged in a circular array on the cylindrical rod. The inner support plates are arranged in an arc shape. The ends of the three inner support plates are fitted together to form a circle. An abutment block is fixedly provided on the cylindrical seat, and the abutment block slides with the pushing assembly.

[0010] By arranging three inner support plates on the cylindrical rod, the arc angle of each inner support plate is 120°, and the cross-section of the three inner support plates constitutes a circle. When the pushing assembly pushes the abutment block to move in the horizontal direction, the cylindrical seat and the cylindrical rod slide relative to each other. At this time, the long hinged rod and the short hinged rod rotate at the same time. Under the restriction of the hinge point, the inner support plate moves to open the contact piece, and the contact piece slides within a limited position on the mounting seat. The radius of the circular cross-section formed by the inner support plate increases, and the thrust in three directions makes the internal force of the moving contact piece more uniform, avoiding asymmetric displacement of the contact piece. When the moving assembly is out of contact with the abutment block, the three inner support plates are reset, and the contact piece is in contact with the static contact under the action of the tightening spring. After the inner support assembly opens the contact piece, the moving contact and the static contact are in contact, avoiding the slow friction between the moving contact and the static contact to cause the generation of arc, thereby reducing the probability of safety accidents caused by arc.

[0011] Preferably, the pushing assembly includes a moving seat, a connecting plate, and a lever plate. A horizontal plate is fixedly installed on the chassis trolley, the connecting plate is slidably installed on the horizontal plate, a return spring is fixedly installed on the horizontal plate, one end of the return spring is connected to the side wall of the connecting plate, the end of the connecting plate slides with multiple abutment blocks, the moving seat is connected to the switch cabinet through a screw, one end of the lever plate is rotatably installed on the moving seat, the other end of the lever plate is provided with a slide groove, a horizontal rod is fixedly provided on the connecting plate, the horizontal rod slides with the slide groove, and a blocking block is fixedly installed in the switch cabinet. When the moving seat moves, the end of the lever plate and the blocking block slide relative to each other to cause the lever plate to rotate, and when the lever plate rotates, the connecting plate and the contact piece are relatively displaced.

[0012] By fixing the horizontal plate on the chassis trolley, the lever plate connects the moving seat to the connecting plate. Under the thrust of the reset spring, the side wall of the lever plate is parallel to the side wall of the chassis trolley. The blocking block on the switch cabinet is set to a trapezoidal shape, and the end of the blocking block is provided with a chamfered corner. When the lead screw is rotated to make the moving seat and the chassis trolley move in the same direction, the end of the lever plate will first contact the end of the blocking block, and then slide relative to the end face of the blocking block. Due to the height limitation of the blocking block, the lever plate will rotate, and the rotation of the lever plate causes the horizontal rod and the slide groove to slide relative to each other, and the lever plate drives the connecting plate to move in the horizontal direction. The connecting plate and the contact piece are relatively displaced, the reset spring is compressed, and the movement of the connecting plate drives the cylindrical seat to slide on the cylindrical rod. The cylindrical seat causes the inner support plate to open the contact piece. When the movable seat continues to move and the lever plate leaves the upper surface of the blocking block, the connecting plate is reset under the thrust of the reset spring, and the cylindrical seat is also reset at the same time. The inner support plate is reset to make the moving contact and the static contact fit together and connected. The connecting plate is connected and disconnected to multiple cylindrical seats at the same time, so that the contact pieces of multiple moving contacts can slide and reset separately, ensuring the fit connection between multiple moving contacts and multiple static contacts, and ensuring the normal flow of current.

[0013] Preferably, the plurality of contacts can be limitedly moved in the axial direction of the mounting seat, the end of the static contact is provided with an arc convex surface, the end of the contact is provided with an arc concave surface, the curvature of the arc convex surface and the arc concave surface are the same, the length of the arc concave surface is greater than the length of the arc convex surface, and the end of the contact can be limitedly slid at the end of the static contact.

[0014] By setting the cooperation between the arc convex surface and the arc concave surface, when the contact piece on the moving contact is engaged with the end of the static contact, the arc convex surface first contacts the arc concave surface, and under the action of the tightening spring, the arc concave surface and the arc convex surface gradually slide relative to each other until the arc concave surface and the arc convex surface are completely fitted together. The length of the arc concave surface is greater than the arc convex surface, so that the arc concave surface has space for sliding adjustment. When the arc concave surface and the arc convex surface slide in cooperation, multiple contact pieces slide in the direction of the axis of the mounting seat to adapt to the connection between the contact piece and the static contact, avoid insufficient contact area between the end of the contact piece and the end of the static contact, and ensure the concentricity of the engagement between the moving contact and the static contact.

[0015] Preferably, a disc is fixedly mounted on the cylindrical rod, and the disc is surrounded by a plurality of contact pieces. A force storage spring is fixedly mounted on the cylindrical seat, and the other end of the force storage spring abuts against the side wall of the disc. A clamping plate is fixedly mounted on the cylindrical seat, and the clamping plate is located above the abutting block. A rectangular groove is provided at one end of the clamping plate, and a protrusion is provided at the other end. The protrusion is made of elastic alloy material, and the protrusion is in contact with the side wall of the disc. An unlocking rod is provided at the end of the connecting plate, and the unlocking rod slides in conjunction with the rectangular groove.

[0016] By arranging a storage spring on the cylindrical seat, when the connecting plate pushes the cylindrical seat to move, the storage spring is compressed, and the clamping plate moves at the same time when the cylindrical seat moves, and the raised end of the clamping plate slides relative to the end of the disc. When the cylindrical seat causes the inner support plate to fully open the contact piece, the raised end of the clamping plate is clamped on the other side of the disc. After the connecting plate is separated from the contact block, the storage spring is still in a compressed state under the limiting action of the clamping plate. During the continuous movement of the connecting plate after it is separated from the abutment block, the unlocking rod is in the rectangular groove. When the unlocking rod slides to fit the side wall of the rectangular groove, the connecting plate will pull the clamping plate to move, and the protrusion of the clamping plate will be pulled from one end of the disc to the other end of the disc. The protrusion at the end of the clamping plate will undergo elastic deformation. At this time, the force storage spring will quickly reset. Under the thrust of the force storage spring, the cylindrical seat will slide quickly on the cylindrical rod, so that the end of the contact piece and the end of the static contact will be quickly connected, reducing the connection time between the moving contact and the static contact, further avoiding the arc caused by the slow connection of the moving and static contacts, and improving the safety of the equipment.

[0017] Preferably, a flexible sleeve is fixedly provided on the abutment block, the flexible sleeve is made of polyimide material, the flexible sleeve is located between the contact piece and the inner support plate, and the end radius of the flexible sleeve is larger than the end radius of the static contact.

[0018] By arranging a flexible sleeve at the end of the connecting plate, polyimide is an organic polymer material with high insulation performance. The flexible sleeve has a certain stretching performance. When the chassis trolley moves to prepare the moving contact and the static contact to cooperate, the flexible sleeve is circular and located between the contact piece and the end of the static contact. When the inner support plate is reset, the contact piece is buckled on the end of the static contact under the action of the tightening spring. The contact piece first contacts the flexible sleeve. When the cylindrical seat is reset, the flexible sleeve and the contact piece slide relative to each other, and the flexible sleeve is disengaged from between the contact piece and the static contact, so that the contact piece and the static contact are fit and connected. The flexible sleeve buffers the clamping force of the moving contact, reduces the impact force between the moving contact and the static contact, and further prevents damage caused by the collision of the moving and static contacts.

[0019] Preferably, two long rods are symmetrically installed on the cylindrical seat, the extension length of the two long rods is greater than the height of the contact piece, and a slot is provided at the end of the long rod. Two buckles corresponding to the long rods are fixedly installed on the inner wall of the insulating cover, and the buckles slide in conjunction with the slots.

[0020] By setting the long rod to cooperate with the buckle, the moving contact and the static contact will be locked in the slot after they are in contact. When the chassis trolley needs to be inspected and moved out of the switch cabinet, the buckle will first limit the movement of the cylindrical seat by clamping the long rod, and the contact arm will drive the cylindrical rod to move at this time. The relative movement of the cylindrical seat and the cylindrical rod will cause the inner support plate to open the moving contact, and the moving contact will be separated from the static contact only after it is opened, avoiding relative friction between the contact piece and the end of the static contact and slow separation, and preventing arcing and safety accidents caused by the separation of the moving and static contacts.

[0021] Preferably, the buckle is made of elastic metal material, the buckle is set in a "J" shape, the end of the long rod and the slot are both provided with chamfered corners, and the inner wall of the slot is in contact with the side wall of the buckle.

[0022] By setting chamfers in the long rod and the slot, when the moving contact is connected or disconnected with the static contact, the buckle will rub against the end of the long rod. The chamfer reduces the friction between the two and makes the fit between the long rod and the buckle smoother. The shape of the buckle is set so that the buckle leaves the slot only after the moving contact moves a certain distance, preventing the moving contact from colliding with the static contact when the moving contact is disconnected.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. By arranging an inner support plate inside the moving contact, the moving contact is stretched open before the moving contact and the static contact are mated. When the moving contact and the static contact are ready to contact and mate, the connecting plate is separated from the contact with the cylindrical seat, and the inner support plate returns to the initial position. Under the action of the tightening spring, the contact piece slides and resets, and multiple contact pieces fasten the end of the static contact, avoiding relative collision between the moving contact and the static contact when the moving contact and the static contact are mated and connected, reducing the probability of safety accidents caused by the collision between the moving and static contacts, and reducing the number of maintenance times of the switch cabinet.

[0025] 2. By setting up an internal support assembly connected to the internal support plate, when the moving assembly is out of contact with the internal support assembly, the three internal support plates are reset, and the contact pieces are in contact with the static contacts under the action of the tightening spring. The internal support assembly stretches the contact pieces and then makes the moving contact and the static contact in contact, avoiding the slow friction between the moving contact and the static contact that causes the generation of arcs, thereby reducing the probability of safety accidents caused by arcs.

[0026] 3. By setting the connection plate and multiple cylindrical seats to connect and disconnect at the same time, the multiple contacts can adjust the clamping angle when they slide and reset and contact the inner support plate, ensuring the centering of the moving contact and the static contact, avoiding contact deviation, and ensuring the normal flow of current. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the appearance structure of the present invention;

[0028] Figure 2 This is a schematic diagram of the movement of the chassis trolley of the present invention;

[0029] Figure 3 This is a schematic diagram of the connection between the moving contact and the static contact of the present invention;

[0030] Figure 4 Schematic diagram of the internal structure of the moving contact of the present invention;

[0031] Figure 5 It is a cutaway side view of the movable contact of the present invention;

[0032] Figure 6 It is a schematic diagram of the movement of the inner support plate of the present invention;

[0033] Figure 7 This is a schematic diagram of the contact piece and the arc concave surface combined with the present invention;

[0034] Figure 8 It is a schematic diagram of the connection between the buckle and the slot of the present invention.

[0035] In the figure: 1. switch cabinet; 101. blocking block; 2. chassis trolley; 21. contact arm; 22. cylindrical rod; 221. disc; 23. horizontal plate; 24. reset spring; 3. moving contact; 31. mounting seat; 32. contact piece; 33. tightening spring; 34. arc concave surface; 4. static contact; 41. arc convex surface; 5. inner support assembly; 51. cylindrical seat; 52. long hinged rod; 53. short hinged rod; 54. abutment block; 55. force storage spring; 56. snap plate; 561. protrusion; 57. rectangular groove; 58. long rod; 581. snap groove; 6. pushing assembly; 61. moving seat; 62. connecting plate σ63. lever plate; 64. slide groove; 65. horizontal rod; 66. unlocking rod; 7. inner support plate; 8. flexible sleeve; 9. buckle. DETAILED DESCRIPTION

[0036] See also Figures 1 to 8 The present invention provides a modular high and low voltage switchgear, the technical solution is as follows:

[0037] A modular high and low voltage switchgear includes a switch cabinet 1, a chassis trolley 2, a moving contact 3, a static contact 4, an inner support assembly 5, a pushing assembly 6 and an inner support plate 7. The switch cabinet 1 is provided with three modules: an upper door, a middle door and a lower door. The chassis trolley 2 is slidably installed in the middle door of the switch cabinet 1. A plurality of contact arms 21 are installed on the chassis trolley 2. The chassis trolley 2 is connected to the switch cabinet 1 through a screw. A plurality of moving contacts 3 are correspondingly installed at the ends of the plurality of contact arms 21. The moving contact 3 includes a mounting seat 31, a contact piece 32 and a tightening spring 33. A plurality of contact pieces 32 are installed in a circumferential array on the mounting seat 31. The ends of the plurality of contact pieces 32 can slide in the upper limit position on the mounting seat 31. The tightening spring 33 is sleeved on the plurality of contact pieces 32. A plurality of insulating plates corresponding to the contact arms 21 are installed inside the switch cabinet 1. The cover, the static contact 4 is fixedly installed in the insulating cover, the end of the contact arm 21 is fixedly installed with a cylindrical rod 22, and an inner support assembly 5 is provided on the cylindrical rod 22. The inner support plate 7 is connected to the inner support assembly 5, and the pushing assembly 6 is connected to the switch cabinet 1 through a screw. The pushing assembly 6 moves in the same direction as the chassis trolley 2. When the pushing assembly 6 moves, the inner support assembly 5 pushes the inner support plate 7 to move, and the movement of the inner support plate 7 causes the contact piece 32 to swing on the mounting seat 31. The chassis trolley 2 is in the middle door of the switch cabinet 1, and the circuit breaker is arranged on the chassis trolley 2, and the busbar room and the cable room are respectively located in the upper door and the lower door of the switch cabinet 1. The circuit breaker can be connected to the busbar and the cable by controlling the movement of the chassis trolley 2 to connect the moving contact 3 with the static contact 4. When the moving contact 3 on the chassis trolley 2 is completed After the static contact 4 is fully inserted into the switch cabinet 1 and ensures good contact, the circuit breaker can perform the opening and closing operations to ensure the normal operation of the power system. When the chassis trolley 2 needs to be repaired, the switch cabinet 1 door has not been opened yet. The moving contact 3 and the static contact 4 are first moved a distance apart by the screw drive, and are properly locked on the track inside the switch cabinet 1. The chassis trolley 2 has not left the switch cabinet 1. Then, the switch cabinet 1 door is opened again, and the screw is turned again to completely separate the chassis trolley 2 from the switch cabinet 1. The chassis trolley 2 can be repaired as a whole. Multiple contact arms 21 are set to be cylindrical. The contact arms 21 are used to electrically connect the moving contact 3 and the circuit breaker. The tightening springs 33 are set to be circular. Multiple contact pieces 32 are wrapped by the tightening springs 33 to form The static contact 4 is also set to a cylindrical shape. Under the action of the tightening spring 33, the cylinder formed by the multiple contact pieces 32 can wrap and clamp the static contact 4 to ensure good contact between the moving contact 3 and the static contact 4. The insulating cover is set to a cylindrical shape, and the inner diameter of the insulating cover is larger than the outer diameter of the cylindrical contact arm 21. When the moving contact 3 and the static contact 4 cooperate, the contact arm 21 can be completely inserted into the insulating cover. The cylindrical rod 22 is coaxially installed on the end face of the contact arm 21. The cross-sectional radius of the cylindrical rod 22 is smaller than the cross-sectional radius of the contact arm 21. It is located inside the cylinder surrounded by multiple contact pieces 32. The pushing component 6 and the chassis trolley 2 are connected to the switch cabinet 1 through the same screw. When the staff rotates the screw, the pushing component 6 will move in the same direction as the chassis trolley 2.When the pushing assembly 6 moves to the set position, it will push the inner support assembly 5 to move. When the inner support assembly 5 moves, it will push the chassis trolley 2 to make the moving contact 3 and the static contact 4 cooperate. The inner support assembly 5 will push the inner support plate 7 to move. The movement of the inner support plate 7 will stretch out the multiple contact pieces 32. The multiple contact pieces 32 slide on the upper limit of the mounting seat 31. The inner diameter of the cylinder formed by the multiple contact pieces 32 becomes larger. When the moving contact 3 and the static contact 4 are ready to contact and cooperate, the pushing assembly 6 will break away from the contact with the inner support assembly 5, and the inner support plate 7 will return to the initial position. Under the action of the tightening spring 33, the contact piece 32 will slide and reset. The multiple contact pieces 32 will fasten the end of the static contact 4, avoiding relative collision between the moving and static contacts 4 when the moving contact 3 and the static contact 4 are cooperated and connected, thereby reducing the safety hazards caused by the collision of the moving and static contacts 4. The probability of a complete accident is reduced, and the number of maintenance times of the switch cabinet 1 is reduced; the internal support assembly 5 includes a cylindrical seat 51, a long hinged rod 52 and a short hinged rod 53. The cylindrical seat 51 is slidably installed on the cylindrical rod 22. One end of the long hinged rod 52 is hinged to one end of the inner support plate 7, and the other end is hinged to the cylindrical seat 51. One end of the short hinged rod 53 is hinged to one end of the inner support plate 7, and the other end is hinged to the cylindrical rod 22. Three inner support plates 7 are arranged in a circular array on the cylindrical rod 22. The inner support plates 7 are arranged in an arc shape. The ends of the three inner support plates 7 are fitted together to form a circle. An abutment block 54 is fixedly provided on the cylindrical seat 51. The abutment block 54 slides with the pushing assembly 6. When the pushing assembly 6 moves, it pushes the cylindrical seat 51 to move so that the inner support plate 7 opens the contact piece 32. The arc angle of each inner support plate 7 is 120° The cross-section of the three inner support plates 7 forms a circle. When the pushing assembly 6 pushes the abutment block 54 to move in the horizontal direction, the cylindrical seat 51 and the cylindrical rod 22 slide relative to each other. At this time, the long hinged rod 52 and the short hinged rod 53 rotate at the same time. Under the restriction of the hinge point, the inner support plate 7 moves to open the contact piece 32, and the contact piece 32 slides within a limited position on the mounting seat 31. The radius of the circular cross-section formed by the inner support plate 7 increases, and the thrust in three directions makes the internal force of the moving contact piece 32 more uniform, avoiding asymmetric displacement of the contact piece 32. When the moving assembly is out of contact with the abutment block 54, the three inner support plates 7 are reset, and the contact piece 32 is in contact with the static contact 4 under the action of the tightening spring 33. The inner support assembly 5 opens the contact piece 32 and then makes the moving contact 3 and the static contact engage. 4 close contact, avoid the slow friction between the moving contact 3 and the static contact 4 causing the generation of arc, and reduce the probability of safety accidents caused by arc; the pushing component 6 includes a moving seat 61, a connecting plate 62, and a lever plate 63. A horizontal plate 23 is fixedly installed on the chassis trolley 2, and the connecting plate 62 is slidably installed on the horizontal plate 23. A return spring 24 is fixedly installed on the horizontal plate 23, and one end of the return spring 24 is connected to the side wall of the connecting plate 62. The end of the connecting plate 62 is slidably matched with multiple abutment blocks 54. The moving seat 61 is connected to the switch cabinet 1 through a screw, and one end of the lever plate 63 is rotatably mounted on the moving seat 61. The other end of the lever plate 63 is provided with a slide groove 64. A horizontal rod 65 is fixedly provided on the connecting plate 62, and the horizontal rod 65 is slidably matched with the slide groove 64.A blocking block 101 is fixedly installed in the switch cabinet 1. When the movable seat 61 moves, the end of the lever plate 63 slides relative to the blocking block 101, causing the lever plate 63 to rotate. When the lever plate 63 rotates, the connecting plate 62 and the contact piece 32 are relatively displaced. The lever plate 63 connects the movable seat 61 with the connecting plate 62. Under the thrust of the return spring 24, the side wall of the lever plate 63 is parallel to the side wall of the chassis trolley 2. The blocking block 101 on the switch cabinet 1 is set to be trapezoidal, and the end of the blocking block 101 is provided with a chamfered corner. When the lead screw is rotated to make the movable seat 61 and the chassis trolley 2 move in the same direction, the end of the lever plate 63 will first contact the end of the blocking block 101, and then slide relative to the end face of the blocking block 101. Due to the height limitation of the blocking block 101, the lever plate 63 will rotate, and the rotation of the lever plate 63 makes the horizontal The rod 65 slides relative to the slide slot 64, and the lever plate 63 drives the connecting plate 62 to move horizontally. The connecting plate 62 and the contact piece 32 are displaced relative to each other, and the return spring 24 is compressed. The movement of the connecting plate 62 drives the cylindrical seat 51 to slide on the cylindrical rod 22. The cylindrical seat 51 causes the inner support plate 7 to open the contact piece 32. When the movable seat 61 continues to move, the lever plate 63 leaves the upper surface of the blocking block 101. Under the thrust of the return spring 24, the connecting plate 62 is reset. The cylindrical seat 51 is also reset at the same time. The inner support plate 7 is reset to make the moving contact 3 fit and connect with the static contact 4. The connecting plate 62 is connected and disconnected with multiple cylindrical seats 51 at the same time, so that the contact pieces 32 of multiple moving contacts 3 can slide and reset individually, ensuring the fit connection between multiple moving contacts 3 and multiple static contacts 4, and ensuring the normal flow of current.

[0038] As an embodiment of the present invention, refer to Figures 2 to 8, a sliding groove corresponding to a plurality of contact pieces 32 is provided on the mounting seat 31, and a cylindrical protrusion 561 is provided at the end of the contact piece 32 to slide with the sliding groove, and the plurality of contact pieces 32 can be limited and moved in the axial direction of the mounting seat 31, and a circular arc convex surface 41 is provided at the end of the static contact 4, and a circular arc concave surface 34 is provided at the end of the contact piece 32. The circular arc convex surface 41 has the same curvature as the circular arc concave surface 34, and the length of the circular arc concave surface 34 is greater than the circular arc convex surface 41. The end of the contact piece 32 can be limited and slid at the end of the static contact 4. When the contact piece 32 on the moving contact 3 is engaged with the end of the static contact 4, the circular arc convex surface 41 first contacts the circular arc concave surface 34, and under the action of the tightening spring 33, the circular arc concave surface 34 and the circular arc convex surface 41 gradually slide relative to each other until the circular arc convex surface 41 is closed. The arc concave surface 34 is completely fitted with the arc convex surface 41. The length of the arc concave surface 34 is greater than that of the arc convex surface 41, so that the arc concave surface 34 has space for sliding adjustment. When the arc concave surface 34 and the arc convex surface 41 slide together, multiple contact pieces 32 slide in the axial direction of the mounting seat 31 to adapt to the connection and cooperation between the contact piece 32 and the static contact 4, avoid insufficient contact area between the end of the contact piece 32 and the end of the static contact 4, and ensure the centering of the movable contact 3 and the static contact 4; a disk 221 is fixedly mounted on the cylindrical rod 22, and the disk 221 is surrounded by multiple contact pieces 32. A storage spring 55 is fixedly mounted on the cylindrical seat 51, and the other end of the storage spring 55 abuts against the side wall of the disk 221. A clamping plate 56 is fixedly mounted on the cylindrical seat 51, and the clamping plate 56 Located above the abutment block 54, a rectangular groove 57 is provided at one end of the clamping plate 56, and a protrusion 561 is provided at the other end. The protrusion 561 at one end of the clamping plate 56 is made of elastic alloy material, and an unlocking rod 66 is provided at the end of the connecting plate 62. The unlocking rod 66 slides with the rectangular groove 57. When the connecting plate 62 pushes the cylindrical seat 51 to move, the storage spring 55 is compressed, and the clamping plate 56 moves at the same time as the cylindrical seat 51 moves. The protrusion 561 end of the clamping plate 56 slides relative to the end of the disc 221. When the cylindrical seat 51 causes the inner support plate 7 to fully open the contact piece 32, the protrusion 561 end of the clamping plate 56 is stuck on the other side of the disc 221. After the connecting plate 62 is out of contact with the abutment block 54, it stores force under the limiting action of the clamping plate 56. When the spring is still in the compressed state, and the connecting plate 62 continues to move after being separated from the abutment block 54, the unlocking rod 66 slides in the rectangular groove 57. When the unlocking rod 66 slides to fit the side wall of the rectangular groove 57, the connecting plate 62 pulls the clamping plate 56 to move, and the protrusion 561 of the clamping plate 56 is pulled from one end of the disc 221 to the other end of the disc 221. The protrusion 561 at the end of the clamping plate 56 undergoes elastic deformation. At this time, the force storage spring 55 quickly resets. Under the thrust of the force storage spring 55, the cylindrical seat 51 quickly slides on the cylindrical rod 22, so that the end of the contact piece 32 is quickly connected to the end of the static contact 4, reducing the connection time of the moving contact 3 and the static contact 4, further avoiding the arc caused by the slow connection of the moving and static contacts 4, and improving the safety of the equipment.A flexible sleeve 8 is fixedly connected to the abutment block 54. The flexible sleeve 8 is made of polyimide material. Polyimide is an organic polymer material with high insulation performance. The flexible sleeve 8 has a certain stretching performance. The flexible sleeve 8 is located between the contact piece 32 and the inner support plate 7. The radius of the end of the flexible sleeve 8 is larger than the radius of the end of the static contact 4. When the chassis trolley 2 moves to prepare the moving contact 3 and the static contact 4 to cooperate, the flexible sleeve 8 is circular and located between the ends of the contact piece 32 and the static contact 4. When the inner support plate 7 is reset, the contact piece 32 is buckled on the end of the static contact 4 under the action of the tightening spring 33, the contact piece 32 first The flexible sleeve 8 contacts the flexible sleeve 8. When the cylindrical seat 51 is reset, the flexible sleeve 8 and the contact piece 32 slide relative to each other, and the flexible sleeve 8 disengages from between the contact piece 32 and the static contact 4, so that the contact piece 32 and the static contact 4 are fitted and connected. The flexible sleeve 8 buffers the clamping force of the moving contact 3, reduces the impact force between the moving contact 3 and the static contact 4, and further prevents damage caused by the collision between the moving and static contacts 4; two long rods 58 are symmetrically installed on the cylindrical seat 51. The extension length of the two long rods 58 is greater than the height of the contact piece 32. A card slot 581 is opened at the end of the long rod 58, and two corresponding long rods 58 are fixedly installed on the inner wall of the insulating cover. The buckle 9 slides in cooperation with the slot 581. After the moving contact 3 and the static contact 4 are in contact and cooperate, the buckle 9 will be locked in the slot 581. When the chassis trolley 2 needs to be inspected and repaired and the chassis trolley 2 is moved out of the switch cabinet 1, the buckle 9 will first limit the movement of the cylindrical seat 51 by clamping the long rod 58, and the contact arm 21 will drive the cylindrical rod 22 to move at this time. The relative movement of the cylindrical seat 51 and the cylindrical rod 22 will cause the inner support plate 7 to open the moving contact 3. The moving contact 3 will be separated from the static contact 4 only after it is opened, avoiding relative friction between the contact piece 32 and the end of the static contact 4 and slowly separating, thereby preventing the generation of electric shock when the moving and static contacts 4 are separated. Arcing can cause safety accidents; the buckle 9 is made of elastic metal material and is set in a "J" shape. The end of the long rod 58 and the slot 581 are both rounded. The inner wall of the slot 581 fits the side wall of the buckle 9. When the moving contact 3 and the static contact 4 are connected or disconnected, the buckle 9 will rub against the end of the long rod 58. The rounded corners reduce the friction between the two and make the connection between the long rod 58 and the buckle 9 smoother. The shape of the buckle 9 ensures that the moving contact 3 moves a certain distance before the buckle 9 leaves the slot 581, preventing the moving contact 3 from colliding with the static contact 4 when the moving contact 3 is disconnected.

[0039] Working principle: When the chassis trolley 2 needs to be connected to the switch cabinet 1, the chassis trolley 2 and the moving seat 61 are moved simultaneously by rotating the lead screw. During the continuous movement of the moving seat 61, the end of the lever plate 63 will first contact the end of the blocking block 101, and then slide relative to the end face of the blocking block 101. Due to the height restriction of the blocking block 101, the lever plate 63 will rotate. The rotation of the lever plate 63 causes the horizontal rod 65 and the slide groove 64 to slide relative to each other. The lever plate 63 drives the connecting plate 62 to move in the horizontal direction. The connecting plate 62 and the contact piece 32 are relatively displaced. The reset spring 24 is compressed, and the movement of the connecting plate 62 drives the cylindrical seat 51 to slide on the cylindrical rod 22. At this time, the long hinged rod 52 and The short hinged rod 53 rotates at the same time. Under the restriction of the hinge point, the inner support plate 7 moves to open the contact piece 32. The contact piece 32 slides on the mounting seat 31. Multiple contact pieces 32 surround the static contact 4. The cylindrical seat 51 moves to compress the storage spring 55. When the cylindrical seat 51 moves, the clamping plate 56 moves at the same time. The protrusion 561 end of the clamping plate 56 slides relative to the end of the disc 221. When the cylindrical seat 51 causes the inner support plate 7 to fully open the contact piece 32, the protrusion 561 end of the clamping plate 56 is clamped on the other side of the disc 221. At this time, the flexible sleeve 8 is located between the moving contact 3 and the static contact 4. After the buckle 9 and the end of the long rod 58 rub against each other, the buckle 9 is engaged with the slot 581. When the movable seat 61 continues to move and the lever plate 63 leaves the upper surface of the blocking block 101, the connecting plate 62 is reset and disengaged from the abutment block 54 under the thrust of the return spring 24. During the continuous movement of the connecting plate 62 after disengaging from the abutment block 54, the unlocking rod 66 slides in the rectangular groove 57. When the unlocking rod 66 slides to fit the side wall of the rectangular groove 57, the connecting plate 62 will pull the clamping plate 56 to move, and the protrusion 561 of the clamping plate 56 is pulled from one end of the disc 221 to the other end of the disc 221. The protrusion 561 at the end of the clamping plate 56 undergoes elastic deformation. At this time, the force storage spring 55 quickly resets. Under the thrust of the force storage spring 55, the cylindrical seat 51 quickly slides and resets on the cylindrical rod 22, and the inner When the support plate 7 returns to its initial position, the cylindrical seat 51 drives the flexible sleeve 8 to disengage from between the moving contact 3 and the static contact 4. Under the action of the tightening spring 33, the contact piece 32 slides and resets, and multiple contact pieces 32 fasten the ends of the static contact 4. When the chassis trolley 2 needs to be inspected and the chassis trolley 2 is moved out of the switch cabinet 1, the buckle 9 will first limit the movement of the cylindrical seat 51 by clamping the long rod 58 during the continuous rotation of the screw, and the contact arm 21 will drive the cylindrical rod 22 to move at this time. The relative movement of the cylindrical seat 51 and the cylindrical rod 22 will cause the inner support plate 7 to open the moving contact 3, and the moving contact 3 will be separated from the static contact 4 only after it is opened. After the moving and static contacts 4 are separated, the chassis trolley 2 can be moved out of the switch cabinet by continuously rotating the screw.

[0040] A specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiment described above. It will be apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments without departing from the principles and concepts of the present invention should still fall within the scope of protection of the present invention.

Claims

1. A modular high and low voltage switchgear, characterized in that: The invention comprises a switch cabinet (1), a chassis trolley (2), a moving contact (3), a static contact (4), an inner support assembly (5), a pushing assembly (6) and an inner support plate (7); the switch cabinet (1) is provided with three modules, namely, an upper door, a middle door and a lower door; the chassis trolley (2) is slidably mounted in the middle door of the switch cabinet (1); a plurality of contact arms (21) are mounted on the chassis trolley (2); the chassis trolley (2) is connected to the switch cabinet (1) via a lead screw; a plurality of moving contacts (3) are correspondingly mounted at the ends of the plurality of contact arms (21); the moving contacts (3) comprise a mounting seat (31), a contact piece (32) and a clamping spring (33); a plurality of contact pieces (32) are mounted in a circumferential array on the mounting seat (31); the ends of the plurality of contact pieces (32) can be fixed on the mounting seat (31) upper limit sliding, the tightening spring (33) is sleeved on a plurality of contact pieces (32), a plurality of insulating covers corresponding to the contact arms (21) are installed inside the switch cabinet (1), the static contact (4) is fixedly installed in the insulating cover, a cylindrical rod (22) is fixedly installed at the end of the contact arm (21), an inner support assembly (5) is provided on the cylindrical rod (22), the inner support plate (7) is connected to the inner support assembly (5), the pushing assembly (6) is connected to the switch cabinet (1) through a screw, the pushing assembly (6) and the chassis trolley (2) move in the same direction, and when the pushing assembly (6) moves, the inner support assembly (5) pushes the inner support plate (7) to move, and the contact piece (32) swings on the mounting seat (31) through the movement of the inner support plate (7).

2. A modular high and low voltage switchgear according to claim 1, characterized in that: The inner support assembly (5) includes a cylindrical seat (51), a long hinged rod (52) and a short hinged rod (53). The cylindrical seat (51) is slidably mounted on the cylindrical rod (22). One end of the long hinged rod (52) is hinged to one end of the inner support plate (7), and the other end is hinged to the cylindrical seat (51). One end of the short hinged rod (53) is hinged to one end of the inner support plate (7), and the other end is hinged to the cylindrical rod (22). Three inner support plates (7) are arranged in a circular array on the cylindrical rod (22). The inner support plates (7) are arranged in an arc shape. The ends of the three inner support plates (7) are fitted together to form a circle. An abutment block (54) is fixedly arranged on the cylindrical seat (51), and the abutment block (54) is slidably matched with the pushing assembly (6).

3. A modular high and low voltage switchgear according to claim 2, characterized in that: The pushing assembly (6) includes a moving seat (61), a connecting plate (62), and a lever plate (63). A horizontal plate (23) is fixedly mounted on the chassis trolley (2). The connecting plate (62) is slidably mounted on the horizontal plate (23). A return spring (24) is fixedly mounted on the horizontal plate (23). One end of the return spring (24) is connected to the side wall of the connecting plate (62). The end of the connecting plate (62) is slidably matched with a plurality of abutment blocks (54). The moving seat (61) is connected to the switch cabinet (1) through a screw. The lever plate (63) is fixedly mounted on the horizontal plate (23). ) is rotatably mounted on a movable seat (61), a slide groove (64) is provided at the other end of the lever plate (63), a horizontal rod (65) is fixedly provided on the connecting plate (62), the horizontal rod (65) and the slide groove (64) are slidably matched, a blocking block (101) is fixedly installed in the switch cabinet (1), when the movable seat (61) moves, the end of the lever plate (63) and the blocking block (101) slide relative to each other, causing the lever plate (63) to rotate, and when the lever plate (63) rotates, the connecting plate (62) and the contact piece (32) are relatively displaced.

4. A modular high and low voltage switchgear according to claim 3, characterized in that: The plurality of contact pieces (32) can move in a limited manner in the axial direction of the mounting seat (31); the end of the static contact (4) is provided with an arc convex surface (41); the end of the contact piece (32) is provided with an arc concave surface (34); the arc convex surface (41) and the arc concave surface (34) have the same curvature; the length of the arc concave surface (34) is greater than the length of the arc convex surface (41); and the end of the contact piece (32) can slide in a limited manner at the end of the static contact (4).

5. The modular high and low voltage switchgear according to claim 4, characterized in that: A disc (221) is fixedly mounted on the cylindrical rod (22), and the disc (221) is surrounded by a plurality of contact pieces (32). A force storage spring (55) is fixedly mounted on the cylindrical seat (51), and the other end of the force storage spring (55) abuts against the side wall of the disc (221). A clamping plate (56) is fixedly mounted on the cylindrical seat (51), and the clamping plate (56) is located above the abutting block (54). One end of the clamping plate (56) is provided with a rectangular groove (57), and the other end is provided with a protrusion (561), and the protrusion (561) is made of elastic alloy material. The protrusion (561) is in contact with the side wall of the disc (221). An unlocking rod (66) is provided at the end of the connecting plate (62), and the unlocking rod (66) is slidably matched with the rectangular groove (57).

6. The modular high and low voltage switchgear according to claim 3, characterized in that: A flexible sleeve (8) is fixedly provided on the abutment block (54), the flexible sleeve (8) being made of polyimide material, the flexible sleeve (8) being located between the contact piece (32) and the inner support plate (7), and the end radius of the flexible sleeve (8) being greater than the end radius of the static contact (4).

7. The modular high and low voltage switchgear according to claim 6, characterized in that: Two long rods (58) are symmetrically mounted on the cylindrical seat (51), the extension length of the two long rods (58) being greater than the height of the contact piece (32), and a card slot (581) is provided at the end of the long rod (58). Two buckles (9) corresponding to the long rods (58) are fixedly mounted on the inner wall of the insulating cover, and the buckles (9) are slidably matched with the card slot (581).

8. The modular high and low voltage switchgear according to claim 7, characterized in that: The buckle (9) is made of elastic metal material and is configured in a "J" shape. The end of the long rod (58) and the clamping slot (581) are both provided with rounded corners, and the inner wall of the clamping slot (581) is in contact with the side wall of the buckle (9).

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