A circuit breaker

Abstract

A kind of circuit breaker belongs to low-voltage electrical technology field.The circuit breaker includes drawer seat and circuit breaker body, circuit breaker body can be moved relative to drawer seat, screw rod is installed in drawer seat, the traction mechanism in drawer seat is dragged to move circuit breaker body after the rotation of screw rod, and realizes three position states of connection, test, separation, characterized by: gear assembly and locking plate are further provided in drawer seat, synchronous movement relationship is established between screw rod, gear assembly and circuit breaker body, when circuit breaker body is in three position states of connection, test, separation, locking plate all locks gear assembly, and then locks screw rod;Gear assembly is unlocked by the operation of locking plate, and then screw rod can continue to move circuit breaker body by the traction mechanism.The advantages are: it realizes the locking function of three positions by gear set and locking plate, compact structure, small space occupation, high degree of modularization, conducive to the development of new functions of drawer seat.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of low-voltage electrical apparatus, and particularly relates to a circuit breaker. BACKGROUND

[0002] The drawer type universal circuit breaker is a kind of power distribution equipment, which undertakes the role of protecting electrical apparatus in the power grid. Because the drawer type universal circuit breaker has maintainability and detectability, this form of circuit breaker is installed in a large number in switch cabinets. The drawer seat is generally directly fixed in the switch cabinet, connected with external power supply through busbars, and the circuit breaker body can be shaken in and out to realize connection and separation with the external power supply. The circuit breaker body has three positions of separation, test and connection in the drawer seat. When the circuit breaker body moves to the above three positions, the drawer seat locking mechanism must be locked, and only after unlocking operation, the circuit breaker body can be further shaken in or out.

[0003] The main form of the locking mechanism of the drawer seat on the market is to realize the locking function through a guide rod recording the position information. This method has low reliability and low transmission accuracy, occupies a large space of the drawer seat bottom plate, and limits the development space of new functions of the drawer seat. At the same time, the locking structure has low modularization degree, needs to disassemble the rotating shaft during maintenance, and has many disassembled parts, which is difficult to maintain.

[0004] In view of the above prior art, it is necessary to reasonably improve the locking structure of the drawer seat of the existing circuit breaker. Therefore, the applicant has made a beneficial design, and the technical scheme to be introduced below is generated in this background. SUMMARY

[0005] The task of the present application is to provide a circuit breaker, which realizes the three-position locking function through a gear set and a locking plate, has compact structure, occupies small space, has high modularization degree, and is beneficial to the development of new functions of the drawer seat.

[0006] The task of the present application is accomplished in the following way. A circuit breaker includes a drawer seat and a circuit breaker body, the circuit breaker body is movable relative to the drawer seat, a lead screw is installed in the drawer seat, the lead screw drives a traction mechanism in the drawer seat to move the circuit breaker body after rotation, and three position states of connection, test and separation are realized, a gear assembly and a locking plate are further provided in the drawer seat, a synchronous movement relationship is established among the lead screw, the gear assembly and the circuit breaker body, when the circuit breaker body is respectively in the three position states of connection, test and separation, the locking plate locks the gear assembly, and further locks the lead screw; the locking plate is actuated to unlock the gear assembly, and then the lead screw can continue to drive the circuit breaker body to move through the traction mechanism.

[0007] In one specific embodiment of the present application, a mounting plate is mounted on the bottom plate of the drawer seat, the locking plate is slidingly arranged on the mounting plate, and the gear assembly comprises a first gear, a second gear and a third gear which are rotatably arranged, the first gear rotates synchronously with the screw rod, the first gear is engaged with the second gear, and the second gear is further engaged with the third gear; when the circuit breaker body is in the three position states of connection, test and separation, the locking plate locks the gear assembly.

[0008] In another specific embodiment of the present application, the gear assembly further comprises a snap element which is rotatably arranged on the mounting plate; when the circuit breaker body is in the three locking position states of connection, test and separation, the first embedding shaft on the locking plate is embedded into the embedding cavity of the third gear, the second embedding shaft on the locking plate is embedded into the recess on the second gear, the embedding protrusion on the locking plate is embedded into the closed groove on the screw rod, and the abutting end of the snap element is located in the lever recess of the third gear.

[0009] In still another specific embodiment of the present application, the recess on the second gear comprises a first recess, a second recess and a third recess, the first recess corresponds to the connection position, the second recess corresponds to the test position, and the third recess corresponds to the separation position.

[0010] In yet another specific embodiment of the present application, the snap element further comprises a rotating hole and a snap end, the rotating hole is used for rotatably arranging the snap element on the mounting plate, and the snap end is snap-fitted with the snap hook of the locking plate.

[0011] In still another specific embodiment of the present application, when the circuit breaker body is in the three locking position states of connection, test and separation, the second embedding shaft is in contact with the bottom of the first recess, the second recess and the third recess respectively, the depth of the first recess is greater than that of the second recess, and the depth of the second recess is greater than that of the third recess.

[0012] In further another specific embodiment of the present application, an indicating element is further arranged in the drawer seat, the indicating element comprises a display surface and a pivot hole, the display surface has the words of unlocking, separation, test and connection, the pivot hole is used for rotatably arranging the indicating element on the bottom plate of the drawer seat, and when the circuit breaker body is in the three locking position states of connection, test and separation, the locking plate drives the indicating element to swing and display the state of locking.

[0013] In a further specific embodiment of the present application, the indicating member further comprises an extension arm, and a sliding groove is arranged on the extension arm, the sliding groove being used for the convex rod of the locking plate to pass through, and the convex rod drives the indicating member to swing when the locking plate moves.

[0014] In a further specific embodiment of the present application, a tension spring is arranged between the locking plate and the mounting plate, and the tension spring provides the moving power for the locking plate.

[0015] In a further specific embodiment of the present application, the first gear is sleeved on the lead screw.

[0016] The present application has the beneficial effects of: through the cooperation of the gear set and the locking plate, the circuit breaker body is locked in the connected, tested and separated three position states during the movement of the circuit breaker body, and through the unlocking of the gear assembly by the unlocking of the locking plate, the lead screw can continue to drive the circuit breaker body to move through the traction mechanism in the unlocking state, so that the gear set and the locking plate realize the three position locking function, the structure is compact, the space occupied by the drawer seat bottom plate is small, the modular degree is high, the reliability is high, the transmission accuracy is high, and the development of new functions of the drawer seat is facilitated. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Part of the structure of the drawer seat of the present application is shown in the figure.

[0018] Figure 2 The schematic diagram of the lead screw of the present application is shown in the figure.

[0019] Figure 3 The schematic diagram of the first gear of the present application is shown in the figure.

[0020] Figure 4 The schematic diagram of the second gear of the present application is shown in the figure.

[0021] Figure 5 The schematic diagram of the third gear of the present application is shown in the figure.

[0022] Figure 6 The schematic diagram of the buckle member of the present application is shown in the figure.

[0023] Figure 7 The schematic diagram of the locking plate of the present application is shown in the figure.

[0024] Figure 8 The schematic diagram of the indicating member of the present application is shown in the figure.

[0025] Figure 9 The side explosion schematic diagram of the drawer seat locking device of the circuit breaker of the present application in the connected position locking state is shown in the figure.

[0026] Figure 10Another side explosion schematic view of the drawer seat locking device of the circuit breaker of the present application in the connecting position locking state.

[0027] Figure 11 Schematic view of the drawer seat locking device of the circuit breaker of the present application in the testing position locking state.

[0028] Figure 12 Schematic view of the drawer seat locking device of the circuit breaker of the present application in the separating position locking state.

[0029] In the figure: 1. mounting plate; 2. screw rod, 21. screw rod head, 22. rod body, 23. screw rod neck, 24. closed groove; 3. gear assembly, 31. first gear, 311. first mounting hole, 3111. clamping protrusion, 32. second gear, 321. tooth part, 322. second gear annular part, 3221. first recess, 3222. second recess, 3223. third recess, 323. second mounting hole; 33. third gear, 331. third gear annular part, 332. third mounting hole, 333. embedded cavity, 334. lever recess, 34. buckle, 341. rotating hole, 342. abutting end, 343. buckle end, 344. notch part, 345. extension part; 4. drag plate; 5. indicating piece, 51. display surface, 52. pivot hole, 53. extended arm, 531. sliding groove; 6. locking plate, 61. mounting shaft, 62. embedded shaft, 621. first embedded shaft, 622. second embedded shaft, 63. buckle hook, 64. embedded protrusion, 65. convex rod; 7. tension spring. DETAILED DESCRIPTION

[0030] The specific embodiments of the present application are described in detail below with reference to the accompanying drawings, but the description of the embodiments is not a limitation on the technical solutions, and any formal but not substantial changes according to the concept of the present application should be considered as the protection scope of the present application.

[0031] In the following description, any directional or positional concepts such as up, down, left, right, front and back are based on the position shown in the corresponding figure, and therefore should not be understood as a special limitation on the technical solutions provided by the present application.

[0032] Please refer to Figure 1 The present application relates to a circuit breaker, which comprises a drawer seat and a circuit breaker body, and the circuit breaker body can be moved into or out of the drawer seat. When the circuit breaker body receives a traction device into the interior of the drawer seat, the circuit breaker body passes through three position states of separation, testing and connection in sequence. When the circuit breaker body is moved out of the drawer seat, it passes through three position states of connection, testing and separation in sequence.

[0033] Please refer to Figure 1The drawer seat comprises a bottom plate at the bottom and side plates at both sides. A three-position locking device is installed on the bottom plate. The three-position locking device comprises a mounting plate 1, a screw rod 2, a gear assembly 3, a drag plate 4, an indicating member 5 and a locking plate 6. The mounting plate 1 is fixedly installed on the bottom plate. The screw rod 2 is rotatably arranged on the mounting plate 1 and is in threaded engagement with the drag plate 4. The gear assembly 3 is installed on the mounting plate 1. The indicating member 5 is rotatably arranged on the drawer seat and is driven by the locking plate 6. The locking plate 6 is slidably arranged on the mounting plate 1.

[0034] When the operator inserts the handle into the screw rod 2 and shakes the handle, the screw rod 2 is driven to rotate. The screw rod 2 drives the traction mechanism in the drawer seat to move. The traction mechanism drives the circuit breaker body to move in the drawer seat. The screw rod 2 and the circuit breaker body move synchronously. At the same time that the screw rod 2 rotates, the gear assembly 3 also rotates due to the synchronous movement relationship between the gear assembly 3 and the screw rod 2. When the gear assembly 3 rotates through a specified stroke, the locking plate 6 locks the gear assembly 3, thereby locking the screw rod 2. The specified stroke refers to the stroke or the number of rotations of the gear assembly 3 corresponding to the movement of the circuit breaker body between the three position states of separation, test and connection. This is calculated during design. That is, when the gear assembly 3 is in the three locking states of separation, test and connection, the circuit breaker body is also in the corresponding three position states of separation, test and connection. The two are also in a synchronous movement relationship through the linkage of the screw rod 2 and the traction mechanism.

[0035] The traction mechanism comprises a drag plate 4 arranged on the bottom plate of the drawer seat. The screw rod 2 passes through a threaded hole in the drag plate 4. The screw rod 2 is in engagement with the threaded hole. Thus, when the screw rod 2 rotates, the drag plate 4 moves along.

[0036] As shown in Figs. Figure 1 and Figure 9 The gear assembly 3 comprises at least two gears for stroke matching, i.e. the locking state between the gear assembly 3 and the locking plate 6 changes when the circuit breaker body is in the three positions of separation, test and connection. In this embodiment, a first gear 31, a second gear 32 and a third gear 33 are arranged on the locking plate 6. The locking state of the three gears and the locking plate 6 should be consistent with the three positions of separation, test and connection of the circuit breaker body. That is, when the circuit breaker body is in the three position states of separation, test and connection, the locking plate 6 locks the gear assembly 3. During movement between two position states of the circuit breaker body, the locking plate 6 does not lock the gear assembly 3. For this embodiment, the first gear 31, the second gear 32 and the third gear 33 are arranged on the locking plate 6.

[0037] In the embodiment, three gears are used to lock the locking plate 6 to achieve three-position locking, which meets the requirement of stroke, i.e. the locking occurs only when the three gears are all rotated to the angle at which the gears can be embedded in the locking plate 6. That is, the stroke between the two locking states of the locking plate 6 matches the stroke between the two position states of the circuit breaker body.

[0038] For the present application, the gear assembly 3 can be extended, for example, the gear assembly 3 includes a gear and a rack, or a gear and a worm, as long as the gear assembly 3 can be locked with the locking plate 6 when the circuit breaker body is in the three positions of separation, test, and connection, and no locking occurs when one position state transitions to another position state, which should be within the protection scope of the present application.

[0039] Referring to Figure 1 and Figure 9 , the gear assembly 3 further includes a latch 34. The screw rod 2 rotates to drive the first gear 31 to rotate. Since the first gear 31 and the second gear 32 are engaged, the second gear 32 rotates when the first gear 31 rotates. The second gear 32 is also engaged with the third gear 33, which rotates when the second gear 32 rotates. The first gear 31, the second gear 32, and the third gear 33 are all rotatably arranged on the mounting plate 1. The first gear 31 is sleeved on the screw rod 2 and synchronously rotates with the screw rod 2. The latch 34 is rotatably arranged on the mounting plate 1. The latch 34 is driven by the third gear 33 to rotate, which is used to lock the locking plate 6 in the unlocked state to prevent the locking plate 6 from immediately locking the first gear 31, the second gear 32, and the third gear 33 to lock the screw rod 2 after being unlocked.

[0040] As shown in Figure 1 , Figure 2 , the screw rod 2 is used to bring the transmission force of the handle to the traction mechanism. At the same time, the screw rod 2 also drives the movement of the gear assembly 3. The screw rod 2 includes a screw rod head 21 and a rod body 22. The rod body 22 is provided with threads. The diameter of the screw rod head 21 is larger than that of the rod body 22. A screw rod neck 23 is arranged between the screw rod head 21 and the rod body 22. The screw rod neck 23 is rotatably arranged with the mounting plate 1, i.e. the screw rod 2 is rotatably arranged on the mounting plate 1. A closed groove 24 is further arranged on the screw rod 2. The closed groove 24 is located on the screw rod neck 23 and has a closed end that penetrates into the screw rod head 21. Preferably, the closed groove 24 is arranged along the axial direction of the screw rod 2.

[0041] As shown in Figure 2 , Figure 3 , Figure 9As shown in the figure, the first gear 31 is circular, with teeth on the circumference, a first mounting hole 311 in the center, and a clamping protrusion 3111 on the inner edge of the first mounting hole 311. The first gear 31 is sleeved on the neck of the lead screw 23, and the clamping protrusion 3111 on the first gear 31 is embedded in the closed groove 24, thereby achieving the technical effect of synchronous rotation of the first gear 31 and the lead screw 2.

[0042] As shown in the figure, Figure 4 the second gear 32 is circular, with a toothed portion 321 on the circumference, a second mounting hole 323 in the center, and a protruding second gear annular portion 322 on the second gear 32. The outer edge surface of the second gear annular portion 322 is provided with a first recess 3221, a second recess 3222, and a third recess 3223, respectively. The first recess 3221 corresponds to the connection position, the second recess 3222 corresponds to the test position, and the third recess 3223 corresponds to the separation position. The depth of the first recess 3221 is greater than the depth of the second recess 3222, and the depth of the second recess 3222 is greater than the depth of the third recess 3223.

[0043] As shown in the figure, Figure 5 , Figure 9 the third gear 33 is circular, with a toothed portion on the circumference, a third mounting hole 332 in the center, and a protruding third gear annular portion 331 on the third gear 33. The third gear annular portion 331 is provided with an embedding cavity 333. Preferably, the embedding cavity 333 is a through groove that penetrates the inner and outer of the third gear annular portion 331. The third gear annular portion 331 is also provided with a lever recess 334. The lever recess 334 is used for snap-fit with the buckle 34.

[0044] As shown in the figure, Figure 6 , Figure 9 the buckle 34 is in the form of a lever, and includes a rotating hole 341 and an abutting end 342. The rotating hole 341 is used for the buckle 34 to be rotationally arranged on the mounting plate 1, i.e., the rotating hole 341 is the rotation center of the buckle 34, so that the buckle 34 forms a lever. The abutting end 342 is snap-fit with the lever recess 334 on the third gear 33. Preferably, the abutting end 342 is circular, and the lever recess 334 is a circular arc type recess.

[0045] As shown in the figure, Figure 6 , Figure 9As shown, the buckle member 34 is further provided with a buckle end 343, which is used to buckle with the locking plate 6, that is, when the locking plate 6 is manually pulled to move left, the buckle end 343 buckles the locking plate 6, preventing the locking plate 6 from moving right due to the spring restoring force.

[0046] As shown in Figure 6 , Figure 9 , the buckle member 34 is further provided with a notch portion 344, which is located at the right side of the buckle end 343, and functions as a space for preventing the locking plate 6 from interfering with the buckle member 34 during the right moving process.

[0047] As shown in Figure 6 , Figure 9 , the buckle member 34 is further provided with an extension portion 345, which is used to abut against the locking plate 6, preventing the buckle member 34 from rotating out of position.

[0048] As shown in Figure 7 , Figure 9 , the locking plate 6 is used to lock the gear assembly 3, in the embodiment, the locking plate 6 moves left and right, and when the circuit breaker body is respectively at the separated, tested, and connected positions, the position of the locking plate 6 is different after locking the gear assembly 3, in the embodiment, when the circuit breaker body is at the connected, tested, and separated positions, the locking plate 6 is at three different positions from right to left. Of course, the locking plate 6 does not adopt the transverse sliding, but adopts the rotating form, which is also possible, and can also achieve the locking with the gear assembly 3, and should also belong to the protection range of the present application. Figure 9

[0049] As shown in Figure 7 , Figure 9 , the locking plate 6 is in the form of a plate, and the locking plate 6 comprises a mounting shaft 61, which is used to achieve the sliding fit between the locking plate 6 and the mounting plate 1. Preferably, the mounting shaft 61 is three, so as to guarantee the reliable sliding fit between the locking plate 6 and the mounting plate 1, while maintaining the interval arrangement of the two.

[0050] As shown in Figure 7 , Figure 9 ​As shown, the locking plate 6 is also provided with two embedded shafts 62, including a first embedded shaft 621 and a second embedded shaft 622. The first embedded shaft 621 is embeddedly fitted in the embedded cavity 333 of the third gear 33, and the second embedded shaft 622 is embeddedly fitted in the first recess 3221, the second recess 3222 and the third recess 3223 of the second gear 32, i.e. the second embedded shaft 622 is embeddedly fitted in the first recess 3221, the second recess 3222 and the third recess 3223 in the connecting, testing and separating positions respectively.

[0051] As shown in Figure 6 , Figure 7 , Figure 9 As shown, the locking plate 6 is also provided with a clasp hook 63, which is clasp-fitted with the clasp end 343. That is, when the locking plate 6 is manually moved to the left to be unlocked, the clasp hook 63 is clasp-fitted with the clasp end 343 to prevent the locking plate 6 from moving to the right.

[0052] As shown in Figure 7 , Figure 9 As shown, the locking plate 6 is also provided with an embedded protrusion 64, which is embeddedly fitted in the closed groove 24 of the lead screw 2. When the embedded protrusion 64 is embedded in the closed groove 24, the lead screw 2 will be locked and cannot be rotated. A convex rod 65 is arranged on the side of the locking plate 6 facing the outside, which is used to drive the indicating piece 5 to swing.

[0053] As shown in Figure 8 , Figure 9 As shown, the indicating piece 5 is used to show the position state of the circuit breaker body to the operator, i.e. to show that the circuit breaker body is in the separating, testing and connecting positions. The indicating piece 5 is a sheet-shaped part, which includes a display surface 51 provided with the words of unlocking, separating, testing, connecting and the like. The indicating piece 5 also includes a pivot hole 52, which is used to pivotally arrange the indicating piece 5 on the bottom plate of the drawer seat. The indicating piece 5 also includes an extending arm 53, which is provided with a sliding groove 531. The sliding groove 531 is used to pass through the convex rod 65, which drives the indicating piece 5 to swing when the locking plate 6 moves. Specifically, when the locking plate 6 is in the locked state of the separating, testing and connecting positions, the indicating piece 5 shows different state positions to the operator.

[0054] Figure 9 , Figure 10 Fig. 4 is a schematic view of the circuit breaker body in the connecting position state, and the following description is in the direction of the arrow in the figure. Figure 9In the above-mentioned "connection" position state, the locking plate 6 is moved to the left against the action of the tension spring 7. At this time, the locking hook 63 of the locking plate 6 pushes the clasp end 343 of the clasp 34, and then the clasp 34 is rotated clockwise until the clasp end 343 no longer blocks the left movement of the locking hook 63. At this time, the operator releases the locking plate 6, and the locking plate 6 is moved to the right under the action of the tension spring 7 until the locking hook 63 abuts against the clasp end 343, and the locking plate 6 stops moving to the right. At this time, the locking plate 6 drives the indicating member 5 to indicate the "unlocking" state. At this time, the first embedding shaft 621 of the locking plate 6 is not embedded in the embedding cavity 333, the second embedding shaft 622 is not embedded in the first recess 3221 of the second gear 32, and the embedding protrusion 64 is not embedded in the closed groove 24. At this time, the operator can rotate the lead screw 2.

[0055] In the above-mentioned "connection" position state, the locking plate 6 is moved to the left against the action of the tension spring 7. At this time, the locking hook 63 of the locking plate 6 pushes the clasp end 343 of the clasp 34, and then the clasp 34 is rotated clockwise until the clasp end 343 no longer blocks the left movement of the locking hook 63. At this time, the operator releases the locking plate 6, and the locking plate 6 is moved to the right under the action of the tension spring 7 until the locking hook 63 abuts against the clasp end 343, and the locking plate 6 stops moving to the right. At this time, the locking plate 6 drives the indicating member 5 to indicate the "unlocking" state. At this time, the first embedding shaft 621 of the locking plate 6 is not embedded in the embedding cavity 333, the second embedding shaft 622 is not embedded in the first recess 3221 of the second gear 32, and the embedding protrusion 64 is not embedded in the closed groove 24. At this time, the operator can rotate the lead screw 2.

[0056] Figure 11 In the above-mentioned "connection" position state, the locking plate 6 is moved to the left against the action of the tension spring 7. At this time, the locking hook 63 of the locking plate 6 pushes the clasp end 343 of the clasp 34, and then the clasp 34 is rotated clockwise until the clasp end 343 no longer blocks the left movement of the locking hook 63. At this time, the operator releases the locking plate 6, and the locking plate 6 is moved to the right under the action of the tension spring 7 until the locking hook 63 abuts against the clasp end 343, and the locking plate 6 stops moving to the right. At this time, the locking plate 6 drives the indicating member 5 to indicate the "unlocking" state. At this time, the first embedding shaft 621 of the locking plate 6 is not embedded in the embedding cavity 333, the second embedding shaft 622 is not embedded in the first recess 3221 of the second gear 32, and the embedding protrusion 64 is not embedded in the closed groove 24. At this time, the operator can rotate the lead screw 2. Figure 9 , 10The handle is continued to be shaken in the above-mentioned "unlocked" state, the handle drives the first gear 31 to rotate, and the second gear 32 and the third gear 33 also rotate due to the meshing relationship. After the third gear 33 rotates, the lever recess 334 rotates and pushes the abutting end 342 of the buckle 34 away from the lever recess 334. Then, the buckle 34 rotates clockwise, and the buckle end 343 is lifted and no longer blocks the buckle hook 63. When the screw rod 2 rotates to the position, the first embedding shaft 621 on the locking plate 6 is opposite to the embedding cavity 333, the second embedding shaft 622 is opposite to the second recess 3222 on the second gear 32, the embedding protrusion 64 is opposite to the closed groove 24, and the abutting end 342 of the buckle 34 is located in the lever recess 334. Under the action of the pulling force of the pull spring 7, the locking plate 6 moves to the right, the first embedding shaft 621 on the locking plate 6 is embedded into the embedding cavity 333, the second embedding shaft 622 is embedded into the second recess 3222 on the second gear 32, and the embedding protrusion 64 is embedded into the closed groove 24.

[0057] In the above process, the second embedding shaft 622 is in contact with the bottom of the second recess 3222, and the second recess 3222 controls the position of the right movement of the locking plate 6. At this time, the position of the locking plate 6 is different from the position of the locking plate 6 in the separation and connection positions, the convex rod 65 on the locking plate 6 moves to the specified position with the locking plate 6, drives the indicating part 5 to rotate counterclockwise from the "unlocked" position to the "test" position, thereby indicating the "test" state, and locks the circuit breaker body in the "test" position state.

[0058] In the "test" position state, the locking plate 6 is moved to the left, thereby unlocking the locked "test" position state, and the screw rod 2 can be continued to be shaken. Since the unlocking process is consistent with the "connection" state, it is not repeated here.

[0059] Figure 12 In order for the circuit breaker body to be in the "separation" position state, and in combination with Figure 9 , 10The handle is continued to be shaken in the above-mentioned "unlocked" state, the handle drives the screw rod 2 to rotate, the rotation of the screw rod 2 drives the first gear 31 to rotate, and the second gear 32 and the third gear 33 also rotate together due to the meshing relationship. After the third gear 33 rotates, the lever recess 334 rotates and pushes the abutting end 342 of the buckle 34 away from the lever recess 334. In turn, the buckle 34 rotates clockwise, and the buckle end 343 above is lifted and no longer blocks the buckle hook 63. When the screw rod 2 rotates to the position, the first embedded shaft 621 on the locking plate 6 is opposite to the embedded cavity 333, the second embedded shaft 622 is opposite to the third recess 3223 on the second gear 32, the embedded protrusion 64 is opposite to the closed groove 24, and the abutting end 342 of the buckle 34 is located in the lever recess 334. Under the action of the pulling force of the pull spring 7, the locking plate 6 moves to the right, the first embedded shaft 621 on the locking plate 6 is embedded into the embedded cavity 333, the second embedded shaft 622 is embedded into the third recess 3223 on the second gear 32, and the embedded protrusion 64 is embedded into the closed groove 24.

[0060] In the above process, the second embedded shaft 622 is in contact with the bottom of the third recess 3223, and the third recess 3223 controls the position of the right movement of the locking plate 6. At this time, the position of the locking plate 6 is different from the position of the locking plate 6 in the trial and connection state, the convex rod 65 on the locking plate 6 moves to the specified position with the locking plate 6, drives the indicating part 5 to move counterclockwise from the "unlocked" position to the "separation" position, thereby indicating the "separation" state, and locking the circuit breaker body in the "separation" position state.

[0061] In the "separation" position state, the locking plate 6 is pulled to move to the left, thereby unlocking the locked "separation" position state, and the screw rod 2 can continue to be shaken. Due to the consistency with the "connection" state, the description is not repeated here.

Claims

1. A circuit breaker, comprising a drawer base and a circuit breaker body, wherein the circuit breaker body is movable relative to the drawer base, and a lead screw (2) is installed inside the drawer base, wherein the lead screw (2) rotates to drive a traction mechanism inside the drawer base to move the circuit breaker body, thereby achieving three position states: connection, test, and disconnection, characterized in that: The drawer seat is further provided with a gear assembly (3) and a locking plate (6), a synchronous movement relationship is established among the lead screw (2), the gear assembly (3) and the circuit breaker body, when the circuit breaker body is in the connection, test and separation positions respectively, the locking plate (6) locks the gear assembly (3) and then locks the lead screw (2); the locking plate (6) is unlocked to unlock the gear assembly (3), and then the lead screw (2) can continue to drive the circuit breaker body to move through the traction mechanism; the gear assembly (3) further comprises a snap element (34), the snap element (34) is rotatably arranged on the mounting plate (1), the snap element (34) is rotated to receive the drive of the gear assembly, and is used for locking the locking plate (6) in the unlocked state to prevent the locking plate (6) from locking the gear assembly to lock the lead screw (2) immediately after being unlocked.

2. The circuit breaker of claim 1, wherein: The bottom plate of the drawer seat is provided with a mounting plate (1), the locking plate (6) is slidably arranged on the mounting plate (1), the gear assembly (3) comprises first, second and third gears (31, 32, 33) which are rotatably arranged, the first gear (31) rotates synchronously with the lead screw (2), the first gear (31) is engaged with the second gear (32), and the second gear (32) is further engaged with the third gear (33); when the circuit breaker body is in the connection, test and separation positions respectively, the locking plate (6) locks the gear assembly (3).

3. The circuit breaker of claim 2, wherein: When the circuit breaker body is locked in the connection, test and separation positions respectively, a first embedding shaft (621) on the locking plate (6) is embedded into an embedding cavity (333) of the third gear (33), a second embedding shaft (622) on the locking plate (6) is embedded into a recess on the second gear (32), an embedding protrusion (64) on the locking plate (6) is embedded into a closed groove (24) on the lead screw (2), and an abutting end (342) of the snap element (34) is located in a lever recess (334) of the third gear (33).

4. The circuit breaker of claim 3, wherein: The recess on the second gear (32) comprises first, second and third recesses (3221, 3222, 3223), the first recess (3221) corresponds to the connection position, the second recess (3222) corresponds to the test position, and the third recess (3223) corresponds to the separation position.

5. The circuit breaker of claim 3, wherein: The snap element (34) further comprises a rotating hole (341) and a snap end (343), the rotating hole (341) is used for rotatably arranging the snap element (34) on the mounting plate (1), and the snap end (343) is snap-fitted with a snap hook (63) of the locking plate (6).

6. The circuit breaker of claim 4, wherein: When the circuit breaker body is locked in the connection, test, and separation positions, respectively, the second embedded shaft (622) is in contact with the bottom of the first, second, and third recesses (3221, 3222, and 3223), respectively, the first recess (3221) has a greater depth than the second recess (3222), and the second recess (3222) has a greater depth than the third recess (3223).

7. The circuit breaker of claim 6, wherein: The drawer seat is also provided with an indicating member (5), which comprises a display surface (51) and a pivot hole (52), the display surface (51) is provided with the words "unlocking", "separation", "testing", and "connection", the pivot hole (52) is used to pivotally arrange the indicating member (5) on the bottom plate of the drawer seat, when the circuit breaker body is locked in the connection, test, and separation positions, respectively, the locking plate (6) drives the indicating member (5) to swing and display the locking state.

8. The circuit breaker of claim 7, wherein: The indicating member (5) further comprises an extending arm (53), which is provided with a sliding groove (531), the sliding groove (531) is used for the convex rod (65) of the locking plate (6) to pass through, when the locking plate (6) moves, the convex rod (65) drives the indicating member (5) to swing.

9. The circuit breaker of claim 2, wherein: A tension spring (7) is arranged between the locking plate (6) and the mounting plate (1) to provide the moving power for the locking plate (6).

10. The circuit breaker of claim 2, wherein: The first gear (31) is sleeved on the lead screw (2).

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