Miniature circuit breaker

Abstract

The invention discloses a miniature circuit breaker, which comprises a circuit breaker box body, a circuit breaker outer cover, a movable contact mechanism, an elliptical jacking mechanism, a protection mechanism and an electric control mechanism, and is characterized in that the circuit breaker box body is provided with an operation assembly which is used for controlling the elliptical jacking mechanism to move so as to disconnect the movable contact mechanism; the elliptical jacking mechanism comprises a rotating shaft rotationally mounted on the inner wall of the circuit breaker box body, an elliptical jacking plate which sleeves the rotating shaft and is in key connection with the rotating shaft, and two first gears which sleeve the rotating shaft and are in key connection with the rotating shaft, and the two first gears are symmetrically distributed on the two sides of the elliptical jacking plate; the two first gears are both provided with connecting assemblies used for enabling the first gears to be movably connected with the inner wall of the circuit breaker box body or the inner wall of the circuit breaker outer cover. According to the invention, abnormal sound caused by easy friction between the first gear and the inner wall of the circuit breaker box body or the inner wall of the circuit breaker outer cover in the prior art is reduced, the probability of friction damage between the first gear and the circuit breaker box body is increased, and the service life of equipment is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and in particular to a miniature circuit breaker. Background Art

[0002] A circuit breaker is a switching device that can close, carry and disconnect current under normal circuit conditions, and close, carry and disconnect current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The boundary between high and low voltage is relatively vague, and those above 3kV are generally called high-voltage electrical appliances. The main functions of circuit breakers include distributing electrical energy, starting asynchronous motors infrequently, and protecting power lines and motors. When a serious overload or short circuit or undervoltage fault occurs, the circuit breaker can automatically cut off the circuit. Its function is equivalent to a combination of a fuse switch and an over- and under-temperature relay.

[0003] A Chinese invention patent with publication number CN115346839B discloses an Internet of Things controlled circuit breaker, including a circuit breaker outer cover, a circuit breaker box, a manual switch, an elliptical lifting mechanism, a moving contact mechanism, a rack slider, a rack and an electric control part; an access terminal and an outlet terminal are respectively arranged at both ends of the circuit breaker box; a static contact is arranged in the access terminal; the manual switch is rotatably mounted on one side of the circuit breaker box; the elliptical lifting mechanism and the moving contact mechanism are rotatably mounted in the circuit breaker box; the manual switch is meshed with a gear arranged on the lower side of the elliptical lifting mechanism through gear teeth; one end of the moving contact mechanism is intermittently in contact with the static contact, and the other end is connected to the outlet terminal through a connection line, and the lower end surface is in contact with the elliptical lifting mechanism; the rack slider and the electric control part are fixedly arranged in the circuit breaker box, and the rack is slidably arranged on the rack slider; the electric control part and the elliptical lifting mechanism are respectively meshed with one end of the rack.

[0004] With respect to the above-mentioned related technologies, the inventors believe that the following defects exist: Gear 1 is connected to the rotating shaft key in the circuit breaker box body, and two gears 1 are arranged on both sides of the elliptical lifting plate. In order to facilitate the installation of gear 1, the connection between gear 1 and the rotating shaft is usually loose, and the two gears 1 are easily abutted against the inner walls on both sides of the circuit breaker box body, which makes it easy for gear 1 to rub against the inner wall of the circuit breaker box body during movement and produce abnormal noise. At the same time, after long-term use, the inner wall of the circuit breaker box body and the surface of gear 1 are easily worn. Therefore, it is necessary to improve the design of the related technologies. Summary of the invention

[0005] In order to solve the above problems, the present invention provides a small circuit breaker.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions: a small circuit breaker, comprising a circuit breaker box body and a circuit breaker cover for closing the opening of the circuit breaker box body, wherein the circuit breaker box body is provided with a moving contact mechanism, an elliptical lifting mechanism for keeping the moving contact mechanism normally connected, a protection mechanism for preventing the circuit from being damaged due to excessive current during power use, and an electric control mechanism for preventing the circuit from being automatically connected during circuit maintenance, and an operating component for controlling the movement of the elliptical lifting mechanism so that the moving contact mechanism is disconnected is provided on the circuit breaker box body, and the elliptical lifting mechanism comprises a rotating shaft rotatably mounted on the inner wall of the circuit breaker box body, an elliptical lifting plate sleeved on the rotating shaft and key-connected, and two first gears sleeved on the rotating shaft and key-connected, the two first gears are symmetrically distributed on both sides of the elliptical lifting plate, and the two first gears are both provided with a connecting component for movably connecting the first gear to the inner wall of the circuit breaker box body or the inner wall of the circuit breaker cover.

[0007] Furthermore, the connecting assembly includes a first plate body sleeved on the rotating shaft and keyed, a second plate body sleeved on the rotating shaft and keyed, and a ball jointly installed on the second plate body and the first plate body, the first plate body is located on a side of the second plate body close to the first gear, a spherical groove cooperating with the ball is provided on a side of the first plate body away from the first gear, a through hole for the ball to pass through is penetrated on the second plate body, the diameter of the through hole on the side away from the first gear is smaller than the diameter of the through hole on the side close to the first gear, and the side of the ball away from the first gear is rollingly connected to the inner wall of the circuit breaker box body or the inner wall of the circuit breaker outer cover.

[0008] Furthermore, the center of the ball is located on a plane where the first plate body and the second plate body are connected, and the second plate body and the first plate body are fixedly connected.

[0009] Furthermore, the protection mechanism includes a rotary toggle switch arranged in the circuit breaker box body, a second gear fixed on the rotary toggle switch, a line connector block arranged in the circuit breaker box body, a wireless module fixed in the circuit breaker box body, a controller fixed in the circuit breaker box body, and a control circuit arranged in the circuit breaker box body, wherein the control circuit is used to connect the rotary toggle switch, the line connector block, the wireless module and the controller in series to form a closed loop, an L-shaped block is fixed to the inner wall of the circuit breaker box body, a rack is penetrated through the L-shaped block and is slidably matched with the L-shaped block, and the rack is meshed with both the second gear and the first gear.

[0010] Further, the moving contact mechanism comprises a moving contact mechanism plate rotatably mounted on the inner wall of the circuit breaker box body and a moving connection contact fixed to the moving contact mechanism plate at one end of the rotating shaft of the moving contact mechanism plate, a static contact is arranged at a position of the inner wall of the circuit breaker box body corresponding to the moving connection contact, a sliding contact fixing plate is fixed at a position of the inner wall of the circuit breaker box body close to the moving contact mechanism plate, a sliding contact rod is fixed on the sliding contact fixing plate, a contact rail for sliding contact rod to slide on the moving contact mechanism plate is arranged on the moving contact mechanism plate, a mounting groove is arranged on one side of the moving contact mechanism plate away from the outer cover of the circuit breaker, a coil spring is fixed on the inner wall of the mounting groove, the other end of the coil spring is fixed to the rotating shaft of the moving contact mechanism plate, an electromagnetic coil protection mechanism is arranged at a position of the inner wall of the circuit breaker box body close to the bottom thereof, the electromagnetic coil protection mechanism is connected to the sliding contact fixing plate through a connection line, a current detection sensor is arranged in the electromagnetic coil protection mechanism, and the other end of the moving contact mechanism is connected to the outlet end on the circuit breaker box body;

[0011] The electric control mechanism includes an electric control part switch which is penetrated and slidably matched on the side wall of one side of the circuit breaker box body, and an insulating sheet fixed to one end of the electric control part switch located in the circuit breaker box body. The line connector block includes two joint blocks, each of which is slidably provided with a steel ball, each steel ball is connected to the corresponding joint block through a compression spring, and the insulating sheet is located between the two joint blocks.

[0012] Furthermore, the side wall of the elliptical lifting plate is provided with an arc-shaped groove, a connecting wire is fixed on the inner wall of the arc-shaped groove near the moving contact mechanism plate, and the free end of the connecting wire is fixed with an armature that can be attracted by the electromagnetic coil protection mechanism when the current of the connected line is too high.

[0013] Furthermore, a limiting assembly is provided in the circuit breaker box body for preventing the connecting wire from shaking and causing the connecting wire to escape from the arc-shaped groove. The limiting assembly includes a fixing rod fixed on the inner wall of the circuit breaker box body and a fixing ring fixed to the end of the fixing rod. The connecting wire passes through the fixing ring and cooperates with the fixing ring.

[0014] Furthermore, fixed blocks are fixed on both sides of the fixed ring, a cylinder is sleeved on the fixed ring and is clearance-matched with the fixed block, a slide groove is provided on the inner wall of the cylinder for sliding cooperation of the fixed block, a spring is fixed at the bottom of the fixed block, the lower end of the spring is fixed to the inner bottom wall of the slide groove, and a vertical groove body is provided on one side of the cylinder for sliding of the fixed rod.

[0015] Furthermore, the operating assembly includes a central shaft rotatably mounted on the inner wall of the circuit breaker box body and a manual switch fixedly sleeved on the central shaft and meshing with one of the first gears.

[0016] Furthermore, one end of the rotating shaft of the rotary toggle switch passes through the side wall of the circuit breaker box body and is rotatably connected, a time-sharing zone groove is provided on the outer wall of the circuit breaker box body near the rotating shaft of the rotary toggle switch, a knob for indicating the time-sharing zone groove is fixed to one end of the rotary toggle switch located outside the circuit breaker box body, a guide rod and a threaded rod are fixed to the outer wall of the circuit breaker box body near the knob, a limit ring is sleeved on the guide rod and the threaded rod, a nut is sleeved on the threaded rod and is threadedly connected to the threaded rod, two nuts are provided and distributed on both sides of the limit ring, and a slot is provided on the limit ring to engage with the knob.

[0017] In summary, the present invention has the following beneficial effects:

[0018] 1. In the present application, the first gear is movably connected to the inner wall of the circuit breaker box body or the inner wall of the circuit breaker outer cover, which reduces the probability of the first gear easily rubbing against the inner wall of the circuit breaker box body or the inner wall of the circuit breaker outer cover and causing abnormal noise in the traditional technology, accelerates the probability of friction damage between the first gear and the circuit breaker box body, and improves the service life of the equipment;

[0019] 2. In the present application, the setting principle of the time zone notches is similar to the time scale on a fan with a timing function, which plays a good indicating role for the rotary toggle switch, so that the circuit breaker has a timing function. In addition, when the staff loosens the nut so that the slot on the limit ring engages with the knob, the rotation of the rotary toggle switch can be limited, thereby ensuring that the circuit breaker is in a normally open state, so that the circuit breaker can be used in situations where it needs to be normally open. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 A schematic diagram of the structure from another perspective;

[0022] Figure 3 yes Figure 2 The enlarged schematic diagram of point A in the middle;

[0023] Figure 4 It is a schematic diagram for highlighting the internal structure of a circuit breaker box according to an embodiment of the present invention;

[0024] Figure 5 is a structural schematic diagram for highlighting a connection component in an embodiment of the present invention;

[0025] Figure 6 is a schematic structural diagram of an embodiment of the present invention for highlighting an elliptical lifting mechanism;

[0026] Figure 7 yes Figure 6A magnified schematic diagram of point B in the middle.

[0027] In the figure: 1. circuit breaker box; 2. circuit breaker cover; 3. moving contact mechanism; 31. moving contact mechanism plate; 311. contact rail; 32. moving contact; 33. static contact; 4. elliptical lifting mechanism; 41. rotating shaft; 42. elliptical lifting plate; 421. arc-shaped groove; 422. connecting wire; 423. armature; 43. first gear; 5. protection mechanism; 51. rotary toggle switch; 52. second gear; 53. line connector block; 54. wireless module; 55. controller; 56. control circuit; 6. electric control mechanism; 61. switch of electric control part; 7. operating assembly; 71. central axis; 72. hand dynamic switch; 8, connecting assembly; 81, first plate; 811, spherical groove; 82, second plate; 821, through hole; 83, ball; 9, L-shaped block; 91, rack; 10, sliding contact fixing plate; 101, sliding contact rod; 11, electromagnetic coil protection mechanism; 12, connecting line; 13, limit assembly; 131, fixing rod; 132, fixing ring; 1321, fixing block; 14, cylinder; 141, slide groove; 15, spring; 16, vertical groove; 17, time zone notch; 18, knob; 19, guide rod; 20, threaded rod; 21, limit ring; 211, slot; 22, nut. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0029] like Figure 1-7As shown, the embodiment of the present application discloses a miniature circuit breaker, comprising a circuit breaker case 1 and a circuit breaker cover 2 for closing the opening of the circuit breaker case 1, wherein a moving contact mechanism 3, an elliptical lifting mechanism 4 for keeping the moving contact mechanism 3 normally connected, a protection mechanism 5 for preventing the circuit from being damaged due to excessive current during power use, and an electric control mechanism 6 for preventing the circuit from being automatically connected during circuit maintenance are arranged in the circuit breaker case 1, and an operating component 7 for controlling the movement of the elliptical lifting mechanism 4 so that the moving contact mechanism 3 is disconnected is arranged on the circuit breaker case 1, and the elliptical lifting mechanism 4 comprises a rotating shaft 41 rotatably mounted on the inner wall of the circuit breaker case 1, an elliptical lifting plate 42 sleeved on the rotating shaft 41 and key-connected, and two first gears 43 sleeved on the rotating shaft 41 and key-connected, the two first gears 43 are symmetrically distributed on both sides of the elliptical lifting plate 42, and the two first gears 43 are both provided with a connecting component 8 for movably connecting the first gear 43 to the inner wall of the circuit breaker case 1 or the inner wall of the circuit breaker cover 2.

[0030] The setting of the connecting component 8 enables the first gear 43 to be movably connected to the inner wall of the circuit breaker box body 1 or the inner wall of the circuit breaker cover 2, thereby reducing the possibility of the first gear 43 easily rubbing against the inner wall of the circuit breaker box body 1 or the inner wall of the circuit breaker cover 2 and causing abnormal noise in the traditional technology, accelerating the probability of friction damage between the first gear 43 and the circuit breaker box body 1, and improving the service life of the equipment.

[0031] In order to prevent the ball 83 from falling off from the second plate 82 and the first plate 81, the connecting assembly 8 includes a first plate 81 sleeved on the rotating shaft 41 and keyed, a second plate 82 sleeved on the rotating shaft 41 and keyed, and a ball 83 installed on the second plate 82 and the first plate 81 together. The first plate 81 is located on the side of the second plate 82 close to the first gear 43, and the side of the first plate 81 away from the first gear 43 is provided with a The spherical groove 811, the second plate body 82 is penetrated by a through hole 821 for the ball 83 to pass through, the diameter of the through hole 821 away from the first gear 43 is smaller than the diameter of the through hole 821 close to the first gear 43, the side of the ball 83 away from the first gear 43 is rollingly connected to the inner wall of the circuit breaker box body 1 or the inner wall of the circuit breaker outer cover 2, the center of the ball 83 is located on the plane where the first plate body 81 and the second plate body 82 are connected, and the second plate body 82 is fixedly connected to the first plate body 81.

[0032] The protection mechanism 5 includes a rotary toggle switch 51 arranged in the circuit breaker box body 1, a second gear 52 fixed on the rotary toggle switch 51, a line connector block 53 arranged in the circuit breaker box body 1, a wireless module 54 fixed in the circuit breaker box body 1, a controller 55 fixed in the circuit breaker box body 1 and a control circuit 56 arranged in the circuit breaker box body 1. The control circuit 56 is used to connect the rotary toggle switch 51, the line connector block 53, the wireless module 54 and the controller 55 in series to form a closed loop. An L-shaped block 9 is fixed to the inner wall of the circuit breaker box body 1. A rack 91 that slides with the L-shaped block 9 is penetrated by the L-shaped block 9, and the rack 91 is meshed with the second gear 52 and the first gear 43.

[0033] The moving contact mechanism 3 includes a moving contact mechanism 3 plate rotatably mounted on the inner wall of the circuit breaker box body 1 and a moving connection contact 32 fixed to the moving contact mechanism 3 plate away from one end of the rotating shaft of the moving contact mechanism 3 plate. A static contact 33 is arranged at a position of the inner wall of the circuit breaker box body 1 corresponding to the moving connection contact 32. A sliding contact fixing plate 10 is fixed at a position of the inner wall of the circuit breaker box body 1 close to the moving contact mechanism 3 plate. A sliding contact rod 101 is fixed on the sliding contact fixing plate 10. A contact rail 311 for sliding cooperation of the sliding contact rod 101 is arranged on the moving contact mechanism 3 plate. A mounting groove is provided on one side of the moving contact mechanism 3 plate away from the outer cover 2 of the circuit breaker, a coil spring is fixed to the inner wall of the mounting groove (the mounting groove and the coil spring are not shown in the figure), and the other end of the coil spring is fixed to the rotating shaft of the moving contact mechanism 3 plate. An electromagnetic coil protection mechanism 11 is provided on the inner wall of the circuit breaker box body 1 near its bottom, and the electromagnetic coil protection mechanism 11 is connected to the sliding contact fixing plate 10 through a connection line 12. A current detection sensor is provided in the electromagnetic coil protection mechanism 11, and the other end of the moving contact mechanism 3 is connected to the outlet terminal on the circuit breaker box body 1.

[0034] In order to ensure that there is no problem of automatic power-on when maintaining the circuit breaker, the electric control mechanism 6 includes an electric control part switch 61 that is inserted through the side wall of one side of the circuit breaker box body 1 and slidably matched, and an insulating sheet (not shown in the figure) fixed to one end of the electric control part switch 61 located in the circuit breaker box body 1. The line connector block 53 includes two joint blocks, each of which is slidably provided with a steel ball, each steel ball is connected to the corresponding joint block through a compression spring 15, and the insulating sheet is located between the two joint blocks. When maintaining the circuit breaker, when the electric control part switch 61 pushes the insulating sheet to insert into the line connector block 53, the electric control part is powered off, which improves the safety of operation.

[0035] The side wall of the elliptical lifting plate 42 is provided with an arc-shaped groove 421, and a connecting wire 422 is fixed on the inner wall of the arc-shaped groove 421 near the position of the moving contact mechanism 3 plate. The free end of the connecting wire 422 is fixed with an armature 423 that can be attracted by the electromagnetic coil protection mechanism 11 when the current of the connected line 12 is too high. The electromagnetic coil protection mechanism 11 is provided with a current detection sensor, which is installed on the connected line 12 and is used to monitor the current size of the connected line 12 in real time; the current detection sensor and the electromagnetic coil are both electrically connected to the main control module of the controller 55; when the current detection sensor detects that the current of the connected line 12 is too high, the main control module controls the electromagnetic coil to be energized, and then attracts the armature 423 downward, at which time the armature 423 drives the elliptical lifting plate 42 to rotate through the connecting wire 422, thereby disconnecting the contact between the moving contact mechanism 3 and the static contact 33, and realizing power failure of the line.

[0036] A limiting assembly 13 is provided in the circuit breaker box body 1 to prevent the connecting wire 422 from shaking and causing the connecting wire 422 to escape from the arc-shaped groove 421. The limiting assembly 13 includes a fixing rod 131 fixed to the inner wall of the circuit breaker box body 1 and a fixing ring 132 fixed to the end of the fixing rod 131. The connecting wire 422 passes through the fixing ring 132 and cooperates with the fixing ring 132.

[0037] Fixed blocks 1321 are fixed on both sides of the fixed ring 132. A cylinder 14 is sleeved on the fixed ring 132 to match the fixed block 1321. The inner wall of the cylinder 14 is provided with a slide groove 141 for sliding fit of the fixed block 1321. A spring 15 is fixed at the bottom of the fixed block 1321. The lower end of the spring 15 is fixed to the inner bottom wall of the slide groove 141. A vertical groove 16 is provided on one side of the cylinder 14 for the fixed rod 131 to slide. When the moving contact mechanism 3 contacts the static contact 33 and the line is connected, the fixed ring 132 plays a good limiting role on the connecting wire 422. With the cooperation of the deadweight of the armature 423, the probability of the connecting wire 422 being separated from the arc-shaped groove 421 is reduced. When the current detection sensor detects that the current of the connected line 12 is too high, the main control module controls the electromagnetic coil to be energized, thereby attracting the armature 423 downward, which may cause the cylinder 14 to move up and down. During this process, the spring 15 vibrates, and the fixed block 1321 cooperates with the cylinder 14 to make the cylinder 14 reciprocate, thereby enhancing the stability of the connecting line 422 during this process.

[0038] The operating assembly 7 includes a central shaft 71 rotatably mounted on the inner wall of the circuit breaker box 1 and a manual switch 72 fixedly sleeved on the central shaft 71 and meshed with one of the first gears 43. When the manual switch 72 is pulled downward, the manual switch 72 drives the elliptical lifting mechanism 4 to rotate clockwise, so that the moving contact mechanism 3 and the static contact 33 are closed, and the rack 91 pushes the second gear 52 to rotate clockwise, thereby pulling the rotary toggle switch 51 to the closed position; when the manual switch 72 is pulled upward, the moving contact mechanism 3 and the static contact 33 are disconnected, and the rack 91 pushes the second gear 52 to rotate counterclockwise, thereby pulling the rotary toggle switch 51 to the disconnected position.

[0039] One end of the rotating shaft of the rotary toggle switch 51 passes through the side wall of the circuit breaker box body 1 and is rotatably connected. A time-division zone groove 17 is provided on the outer wall of the circuit breaker box body 1 near the rotating shaft of the rotary toggle switch 51. A knob 18 for indicating the time-division zone groove 17 is fixed to one end of the rotary toggle switch 51 located outside the circuit breaker box body 1. A guide rod 19 and a threaded rod 20 are fixed to the outer wall of the circuit breaker box body 1 near the knob 18. A limit ring 21 that is clearance-matched with the guide rod 19 and the threaded rod 20 is sleeved on the guide rod 19. A nut 22 that is threadedly connected to the threaded rod 20 is sleeved on the threaded rod 20. Two nuts 22 are provided and distributed on both sides of the limit ring 21. A card slot 211 that is snap-fitted with the knob 18 is provided on the limit ring 21.

[0040] The setting principle of the time zone notch 17 is similar to the time scale on a fan with a timing function, which plays a good indicating role for the rotary toggle switch 51, so that the circuit breaker has a timing function. In addition, when the staff loosens the nut 22, so that the slot 211 on the limit ring 21 is engaged with the knob 18, the rotation of the rotary toggle switch 51 can be limited, thereby ensuring that the circuit breaker is in a normally open state, so that the circuit breaker can be used in a situation where it needs to be normally open.

[0041] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A miniature circuit breaker, comprising a circuit breaker housing (1) and a circuit breaker cover (2) for closing an opening of the circuit breaker housing (1), wherein the circuit breaker housing (1) is provided with a moving contact mechanism (3), an elliptical lifting mechanism (4) for maintaining the moving contact mechanism (3) normally connected, a protection mechanism (5) for preventing the circuit from being damaged due to excessive current during power use, and an electric control mechanism (6) for preventing the circuit from being automatically connected during circuit maintenance, and wherein the circuit breaker housing (1) is provided with an operating assembly (7) for controlling the movement of the elliptical lifting mechanism (4) so ​​as to disconnect the moving contact mechanism (3), wherein: The elliptical lifting mechanism (4) comprises a rotating shaft (41) rotatably mounted on the inner wall of the circuit breaker box body (1), an elliptical lifting plate (42) sleeved on the rotating shaft (41) and key-connected, and two first gears (43) sleeved on the rotating shaft (41) and key-connected, the two first gears (43) being symmetrically distributed on both sides of the elliptical lifting plate (42), and the two first gears (43) being provided with a connecting assembly (8) for movably connecting the first gear (43) to the inner wall of the circuit breaker box body (1) or the inner wall of the circuit breaker cover (2).

2. A miniature circuit breaker according to claim 1, characterized in that: The connecting assembly (8) comprises a first plate (81) sleeved on the rotating shaft (41) and key-connected, a second plate (82) sleeved on the rotating shaft (41) and key-connected, and a ball (83) mounted on the second plate (82) and the first plate (81), wherein the first plate (81) is located on a side of the second plate (82) close to the first gear (43), a spherical groove (811) cooperating with the ball (83) is provided on a side of the first plate (81) away from the first gear (43), a through hole (821) is provided on the second plate (82) through which the ball (83) passes, the diameter of the through hole (821) on the side away from the first gear (43) is smaller than the diameter of the through hole (821) on the side close to the first gear (43), and the side of the ball (83) away from the first gear (43) is rollingly connected to the inner wall of the circuit breaker box (1) or the inner wall of the circuit breaker cover (2).

3. A miniature circuit breaker according to claim 2, characterized in that: The center of the ball (83) is located on a plane where the first plate (81) and the second plate (82) are connected, and the second plate (82) and the first plate (81) are fixedly connected.

4. A miniature circuit breaker according to claim 2, characterized in that: The protection mechanism (5) comprises a rotary toggle switch (51) arranged in a circuit breaker box (1), a second gear (52) fixed on the rotary toggle switch (51), a line connector block (53) arranged in the circuit breaker box (1), a wireless module (54) fixed in the circuit breaker box (1), a controller (55) fixed in the circuit breaker box (1), and a control circuit (56) arranged in the circuit breaker box (1); the control circuit (56) is used to connect the rotary toggle switch (51), the line connector block (53), the wireless module (54) and the controller (55) in series to form a closed loop; an L-shaped block (9) is fixed on the inner wall of the circuit breaker box (1); a rack (91) is provided through the L-shaped block (9) and is slidably matched with the L-shaped block (9); the rack (91) is meshed with both the second gear (52) and the first gear (43).

5. A miniature circuit breaker according to claim 4, characterized in that: The moving contact mechanism (3) comprises a moving contact mechanism (3) plate rotatably mounted on the inner wall of the circuit breaker box body (1) and a moving connection contact (32) fixed to the moving contact mechanism (3) plate at one end of the rotating shaft of the moving contact mechanism (3) plate, a stationary contact (33) is arranged at a position of the inner wall of the circuit breaker box body (1) corresponding to the moving connection contact (32), a sliding contact fixing plate (10) is fixed at a position of the inner wall of the circuit breaker box body (1) close to the moving contact mechanism (3) plate, a sliding contact rod (101) is fixed on the sliding contact fixing plate (10), and a contact for the sliding contact rod (101) is arranged on the moving contact mechanism (3) plate. 1) a sliding contact rail (311), a mounting groove is provided on the side of the moving contact mechanism (3) plate away from the circuit breaker outer cover (2), a coil spring is fixed to the inner wall of the mounting groove, the other end of the coil spring is fixed to the rotating shaft of the moving contact mechanism (3) plate, an electromagnetic coil protection mechanism (11) is provided on the inner wall of the circuit breaker box body (1) near the bottom thereof, the electromagnetic coil protection mechanism (11) is connected to the sliding contact fixing plate (10) via a connection line (12), a current detection sensor is provided in the electromagnetic coil protection mechanism (11), and the other end of the moving contact mechanism (3) is connected to the connection end on the circuit breaker box body (1); The electric control mechanism (6) comprises an electric control part switch (61) which is arranged through a side wall of one side of the circuit breaker box body (1) and is slidably matched, and an insulating sheet fixed to one end of the electric control part switch (61) located inside the circuit breaker box body (1); the line connector block (53) comprises two joint blocks, each of which is slidably provided with a steel ball, each of which is connected to a corresponding joint block via a compression spring (15); and the insulating sheet is located between the two joint blocks.

6. A miniature circuit breaker according to claim 5, characterized in that: The side wall of the elliptical lifting plate (42) is provided with an arc-shaped groove (421), a connecting wire (422) is fixed on the inner wall of the arc-shaped groove (421) at a position close to the moving contact mechanism (3) plate, and an armature (423) is fixed at the free end of the connecting wire (422) that can be attracted by the electromagnetic coil protection mechanism (11) when the current of the connected circuit (12) is too high.

7. A miniature circuit breaker according to claim 6, characterized in that: A limiting assembly (13) is provided in the circuit breaker box body (1) for preventing the connecting wire (422) from shaking and causing the connecting wire (422) to escape from the arc-shaped groove (421); the limiting assembly (13) comprises a fixing rod (131) fixed to the inner wall of the circuit breaker box body (1) and a fixing ring (132) fixed to the end of the fixing rod (131); the connecting wire (422) passes through the fixing ring (132) and cooperates with the fixing ring (132).

8. A miniature circuit breaker according to claim 7, characterized in that: Fixed blocks (1321) are fixed on both sides of the fixed ring (132); a cylinder (14) is sleeved on the fixed ring (132) and is clearance-matched with the fixed block (1321); a slide groove (141) is provided on the inner wall of the cylinder (14) for the fixed block (1321) to slide with; a spring (15) is fixed at the bottom of the fixed block (1321); the lower end of the spring (15) is fixed to the inner bottom wall of the slide groove (141); and a vertical groove body (16) is provided on one side of the cylinder (14) for the fixed rod (131) to slide.

9. A miniature circuit breaker according to claim 7, characterized in that: The operating assembly (7) comprises a central shaft (71) rotatably mounted on the inner wall of the circuit breaker box (1) and a manual switch (72) fixedly sleeved on the central shaft (71) and meshing with one of the first gears (43).

10. A miniature circuit breaker according to claim 7, characterized in that: One end of the rotating shaft of the rotary toggle switch (51) penetrates the side wall of the circuit breaker box (1) and is rotatably connected; a time-division zone notch (17) is provided on the outer wall of the circuit breaker box (1) near the rotating shaft of the rotary toggle switch (51); a knob (18) for indicating the time-division zone notch (17) is fixed to one end of the rotary toggle switch (51) located outside the circuit breaker box (1); and a time-division zone notch (17) is fixed to the outer wall of the circuit breaker box (1) near the knob (18). A guide rod (19) and a threaded rod (20) are provided, the guide rod (19) is sleeved with a limit ring (21) which is clearance-matched with the guide rod (19) and the threaded rod (20), the threaded rod (20) is sleeved with a nut (22) which is threadedly connected with the threaded rod (20), two nuts (22) are provided and distributed on both sides of the limit ring (21), and the limit ring (21) is provided with a slot (211) which is snap-fitted with the knob (18).

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