A miniature circuit breaker

Abstract

The present application relates to a miniature circuit breaker, which includes an outer shell for storing electronic components; a trigger mechanism includes: an operating handle and a central lever; a coil assembly includes a magnetic coil and an iron core, and the iron core can push the central lever; a conductive member is used to connect the miniature circuit breaker with a power supply circuit of an external circuit; a bimetallic strip includes two metal sheet clamps with different thermal expansion coefficients that are tightly attached together and are located outside the outer shell, and the operating handle is located on the clamps, and an initial groove, a transition groove and a reset groove are sequentially opened on the clamps; when the operating handle is located between the transition groove and the reset groove, the conductive member is disconnected; when the operating handle is located between the initial groove and the transition groove, the conductive member is closed; the present application has the effect of effectively reminding the user whether the line is disconnected due to a power outage or due to the use of high-power electrical appliances when the line is energized, and the user can take corresponding measures according to the power outage phenomenon of the line.

Description

Technical Field

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

[0002] Currently, miniature circuit breakers are protective devices installed in terminal distribution lines, primarily used to protect lines and electrical equipment from overload, short circuit, and leakage. As electricity demand for production and daily life continues to increase, higher requirements are being placed on power supply safety, reliability, and intelligence.

[0003] The aforementioned related technologies still have drawbacks: when multiple high-power appliances are used simultaneously on a single circuit in a home, a current overload may occur. The miniature circuit breaker instantly disconnects the circuit, stopping power to all appliances on the same circuit. However, people often don't know whether this disconnection is caused by a power outage or a protective mechanism activated by the circuit breaker. Furthermore, after the miniature circuit breaker operates, the high-power appliances on the circuit automatically shut down the next time power is supplied, reducing the current within the circuit and allowing the circuit to recover from the overload. However, manual adjustment of the miniature circuit breaker is required when power is restored, which is inconvenient and needs improvement. Summary of the Invention

[0004] When the line is energized, it can effectively remind the user whether the line is disconnected due to a power outage or the use of high-power electrical appliances. The user can take corresponding measures according to the power outage phenomenon of the line. The present application provides a miniature circuit breaker.

[0005] This application provides a miniature circuit breaker, which adopts the following technical solution:

[0006] A miniature circuit breaker includes an outer shell for storing electronic components;

[0007] A trigger mechanism is installed in the outer shell;

[0008] The trigger mechanism includes:

[0009] An operating handle is rotatably connected to the interior of the outer shell, with an end portion thereof exposed to the exterior of the outer shell, the operating handle having an initial position and a power-off position. When the operating handle is in the initial position, the circuit is connected; when the operating handle is in the power-off position, the circuit is disconnected;

[0010] A central lever, used to control whether the circuit is conductive, and a driving member is connected to the operating handle;

[0011] The coil assembly is installed in the outer shell;

[0012] The coil assembly comprises:

[0013] A magnetic coil, wherein the inner portion of the magnetic coil is wrapped in a plastic shell, the outer portion of the magnetic coil is coated with an insulating material, and the magnetic coil itself can be energized;

[0014] An iron core movably connected to the plastic shell, wherein the iron core is capable of pushing the central lever;

[0015] A conductive member, used to connect the miniature circuit breaker to the power supply circuit of the external circuit, wherein the conductive member is connected when the operating handle is in the initial position, and is disconnected when the operating handle is in the power-off position;

[0016] The arc extinguishing chamber is equipped with multiple parallel metal plates;

[0017] A bimetallic strip is installed in the outer shell, the bimetallic strip comprises two metal strips with different thermal expansion coefficients that are tightly attached to each other, the bimetallic strip is connected to the central lever and can drive the central lever to move;

[0018] The clamping plate is located outside the outer shell, the operating handle is located inside the clamping plate, and the clamping plate is provided with a sliding track that is consistent with the rotation trajectory of the operating handle; the clamping plate is sequentially provided with an initial groove, a transition groove, and a reset groove; when the operating handle is located between the transition groove and the reset groove, the conductive member is disconnected; when the operating handle is located between the initial groove and the transition groove, the conductive member is closed;

[0019] The reset member is located in the slide rail. When the operating handle enters the reset groove, the reset member causes the operating handle to return to the initial groove.

[0020] By adopting the above technical solution, when a short circuit occurs in the line, the magnetism generated by the magnetic coil increases, forcing the iron core to move toward the central lever, and the central lever squeezes the conductive part to separate the conductive part. At this time, due to the sudden increase in the magnetism formed by the magnetic coil during the short circuit, the iron core quickly and strongly hits the central lever, and the operating handle will directly move from the initial position to the reset position and be locked in the reset position to achieve the effect of disconnecting the circuit breaker; and if there are too many high-power electrical appliances in the line, resulting in too much current in the line, the bimetallic strip will slowly bend and press the central lever, and since the bimetallic strip is gradually heated up, it will cause the circuit breaker to break. When the bimetallic strip is bent during the high temperature process, the operating handle will move slowly when the bimetallic strip squeezes the central lever. At this time, due to the action of the reset member, the operating handle will not immediately enter the reset position from the initial position, but will first enter between the transition position and the reset position. At this time, the conductive member is disconnected, and when the temperature of the bimetallic strip drops, the reset member causes the operating handle to enter the transition groove. At this time, the circuit will automatically close when the operating handle enters the transition groove. If the current in the subsequent circuit continues to increase, causing the bimetallic strip to deform significantly again, the operating handle will enter the reset position and be clamped in the reset position to completely disconnect the circuit current.

[0021] Optionally, the conductive part includes an upper part and a lower part, one end of the lower part is connected to the metal plate of the arc extinguishing chamber, and the upper part is connected to the coil assembly. When the line is conductive, the upper part and the lower part are tightly attached; when the line is disconnected, the upper part and the lower part are separated. An adjusting box is fixedly connected to the central lever, the opening of the adjusting box faces the iron core and is bonded with elastic cloth, and a non-Newtonian fluid is placed in the adjusting box. When the adjusting box is tilted, the non-Newtonian fluid is concentrated at the corners of the adjusting box. An expansion cavity is also provided between the central lever and the adjusting box, and the non-Newtonian fluid can enter the adjusting box through the expansion cavity.

[0022] By adopting the above technical solution, when the line is first disconnected, the operating handle will first enter the transition groove. If the line is short-circuited at this time, the central lever will have a certain degree of deviation when the operating handle enters the transition groove. When the line is short-circuited, the impact force of the iron core on the central lever may be insufficient, resulting in the inability to effectively push the central lever. However, when the operating handle enters the transition groove, the adjustment box will tilt, and the non-Newtonian fluid will gather at the corners of the adjustment box, which will increase the height of the central lever in disguise, so that the iron core can still fully contact the central lever, so as to press the central lever and rotate the operating handle to make the operating handle enter the reset position.

[0023] Optionally, the notches of the initial groove and the transition groove facing the reset groove are both provided with inclined slopes, and the other slopes of the initial groove and the transition groove are both rectangular end faces.

[0024] By adopting the above technical solution, the inclined slope helps the operating handle to move toward the reset groove, while the rectangular end surface prevents the operating handle from being elastically acted upon by the reset member so that it can remain stable in the transition groove or the reset groove and is not easily detached therefrom.

[0025] Optionally, the return member includes a lower return spring, one end of the lower return spring is fixedly connected to one end of the sliding rail close to the return groove, and the other end of the lower return spring is fixedly connected to the operating handle. When the operating handle is in the initial position, the lower return spring is in an unstressed state.

[0026] By adopting the above technical solution, when the operating handle is in the initial position, the lower return spring is in an unstressed state. As the operating handle moves, when it enters the transition groove or exceeds the transition groove, the lower return spring is in a compressed state. When the operating handle continues to move toward the reset groove, the lower return spring will generate a certain elastic force on the operating handle, and this elastic force will gradually increase. However, due to the impact of the iron core, the impact force generated on the central lever is much greater than the elastic force of the lower return spring. The operating handle will not move due to the elastic force of the lower return spring; under the pressure of the bimetallic strip, the operating handle will also overcome the elastic force of the lower return spring and enter the reset groove. Under the action of the lower return spring and the upper return spring, the operating handle will move toward the transition groove until the operating handle enters the transition groove; if the operating handle returns from the reset groove to the initial groove, the upper return spring and the lower return spring will return to their original state, and due to the lower return spring.

[0027] Optionally, the reset member also includes an upper reset spring, one end of the upper reset spring is fixedly connected to the side of the sliding rail close to the initial groove, the other end of the upper reset spring is fixedly connected to the operating handle, and the elastic coefficient of the upper reset spring is smaller than the elastic coefficient of the lower reset spring. When the operating handle is in the initial position, the upper reset member is in a compressed state.

[0028] By adopting the above technical solution, when the operating handle is in the initial position, the upper return spring is in a compressed state. Since the elastic coefficient of the upper return spring is smaller than the elastic coefficient of the lower return spring, the upper return spring has little pulling effect on the operating handle. If the operating handle suddenly enters the initial position from the reset position, the upper return spring can act as a buffer, reducing the impact of the operating handle on the splint, thereby protecting the splint.

[0029] Optionally, a shift member capable of positioning the control handle is further provided in the control handle, and the shift member includes a displacement member, a shift block and a shift spring; the shape of the shift block is the same as the slot shape of the transition groove, the displacement member slides in the sliding rail, one end of the shift block is rotatably connected to the displacement member, one end of the shift spring is fixedly connected to the displacement member, and the other end of the shift spring is fixedly connected to the free end of the shift block.

[0030] By adopting this technical solution, the shift block can be rotated and retracted within the cavity. The shape of the shift block matches the slot shape of the transition groove. When the shift block enters the initial groove or transition groove, it will fit into the initial groove or transition groove. A shift spring is located within the cavity. If the shift member moves from the initial groove to the transition groove or from the transition groove to the reset groove, the shift spring will retract, driving a larger area of ​​the shift block into the cavity.

[0031] Optionally, a rebound component is further provided in the splint, a rebound cavity is opened in the splint, the rebound cavity is connected with the transition groove and the reset groove, the rebound component is located in the rebound cavity, the rebound component includes a rebound block and a rebound spring, one end of the rebound spring is fixedly connected to the rebound cavity, the other end of the rebound spring is fixedly connected to the rebound block, the end of the rebound block fixedly connected to the rebound spring can enter the transition groove or the reset groove, and the rebound block is also integrally formed with a hand grip that passes through the splint and slides on the splint.

[0032] By adopting the above technical solution, when the user wants to reset the circuit breaker and reconnect the line, the user can hold the hand grip and move the hand grip toward the shift piece, so that the rebound block squeezes the shift piece that enters the transition groove or the reset groove, and pushes the shift piece out of the transition groove or the reset groove. At this time, the rebound spring is in a stretched state, and because the rebound block blocks the transition groove or the reset groove, the shift block shrinks back into the displacement piece and can only enter the initial groove, thereby achieving the reset of the circuit breaker.

[0033] Optionally, a parallel rod is provided at the free end of the hand grip located at the transition groove and the reset groove, and the two ends of the hand grip are fixedly connected to the two ends of the parallel rod respectively.

[0034] By adopting the above technical solution, the parallel rod connects the two handles. When the parallel rod moves, it can drive the two handles to move at the same time, and at the same time drive the rebound block located in the transition groove and the reset groove to move. The gear piece is squeezed out of the transition groove or the reset groove through the rebound block, which is convenient for the staff to operate.

[0035] In summary, this application includes at least one of the following beneficial technical effects:

[0036] When the voltage is too high due to the use of high-power electrical appliances, the circuit breaker will automatically disconnect and disable some high-power appliances to ensure the safety of the line. The line can then be reconnected without the user having to specifically open the circuit breaker, which is convenient and protects the user. When a power outage occurs due to a short circuit, the circuit breaker will also disconnect the line to protect the safety of the line. When a short circuit occurs in the line, the non-Newtonian fluid can effectively ensure that the circuit breaker can effectively cut off the current during use, shorting the line. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.

[0038] Figure 2 It is a schematic diagram of the structure after the central lever is bent in the embodiment of the present application.

[0039] Figure 3 It is a partial structural diagram highlighting the reset component and the shift member in the embodiment of the present application.

[0040] Figure 4 It is a schematic cross-sectional view of the local structure highlighting the initial groove, transition groove and reset groove in the embodiment of the present application.

[0041] Figure 5 It is a schematic cross-sectional view of the local structure highlighting the shift member and the rebound member in the embodiment of the present application.

[0042] Figure 6 It is a structural schematic diagram highlighting the handle and parallel rod in the embodiment of the application.

[0043] Figure numerals: 1. outer shell; 2. trigger mechanism; 3. operating handle; 4. central lever; 5. coil assembly; 6. magnetic coil; 7. plastic shell; 8. iron core; 9. conductive part; 10. upper part; 11. lower part; 12. arc extinguishing chamber; 13. metal plate; 14. bimetallic strip; 15. splint; 16. sliding rail; 17. initial groove; 18. transition groove; 19. reset groove; 20. reset part; 21. adjustment box; 22. elastic cloth; 23. expansion cavity; 24. inclined slope; 25. rectangular end face; 26. upper reset spring; 27. lower reset spring; 28. driving part; 29. ​​gear part; 30. displacement part; 31. gear block; 32. gear spring; 33. rebound cavity; 34. rebound assembly; 35. rebound block; 36. rebound spring; 37. hand grip; 38. parallel rod. DETAILED DESCRIPTION

[0044] The following is combined with Figure 1-6 This application is described in further detail.

[0045] The embodiment of the present application discloses a miniature circuit breaker. Figure 1 、 Figure 2 , a miniature circuit breaker includes.

[0046] The outer shell 1 is used for storing and installing electronic components. A structure for protecting the circuit is arranged inside the outer shell 1, which includes a trigger mechanism 2, a coil assembly 5, a conductive member 9, an arc extinguishing chamber 12 and a bimetallic strip 14.

[0047] Reference Figure 1 、 Figure 2 The trigger mechanism 2 includes an operating handle 3 and a central lever 4. The operating handle 3 is rotatably connected to the interior of the outer shell 1, but a portion of the operating handle 3 is exposed to the outside of the outer shell 1 so that the user can rotate it, thereby rotating the operating handle 3 as a whole. The central lever 4 is located inside the outer shell 1, and the central lever 4 is used to control whether the circuit in the circuit breaker is connected. The operating handle 3 has an initial position and a power-off position depending on the position of its end. When the operating handle 3 is in the initial position, the circuit is connected. When the operating handle 3 is in the power-off position, the circuit is disconnected.

[0048] A driving member 28 is provided between the central lever 4 and the operating handle 3. In this embodiment, when the operating handle 3 is rotated downward, the driving member 28 pulls up one end of the central lever 4, while the other end of the central lever 4 is pressed down due to the lever principle, thereby disconnecting the circuit breaker circuit. At this time, the operating handle 3 is in the power-off position. When the operating handle 3 is rotated upward, the driving member 28 lifts the end of the central lever 4 connected to the operating handle 3 upward. At this time, the end of the central lever 4 away from the driving member 28 is lifted, connecting the circuit breaker circuit. At this time, the operating handle 3 is in the initial position.

[0049] Reference Figure 1 、 Figure 2The coil assembly 5 comprises an iron core 8 and a conductive magnetic coil 6. The magnetic coil 6 is wrapped in a plastic shell 7, which is wound around the shell and coated with an insulating material. The iron core 8 is located within the plastic shell 7, and a pull spring is located within the plastic shell 7 to drive the iron core 8 upward and downward. When current is applied to the wire, a circular magnetic field is formed around it. The magnetic coil 6 wrapped around the plastic shell 7 creates a stronger magnetic field. When normal current flows through the coil, the resulting magnetic field is insufficient to overcome the tension of the spring, and the iron core 8 within the plastic shell 7 is not pulled downward by the magnetic attraction of the coil. However, when a short circuit occurs, the current in the circuit increases abnormally. The increased current flowing through the coil generates a strong magnetic field. This magnetic field is sufficient to overcome the tension of the spring, and the iron core 8 within the plastic shell 7 is pulled downward by the magnetic attraction of the coil. The end of the moving iron core 8 presses against the end of the central lever 4 away from the actuator 28, disconnecting the circuit within the circuit breaker. At this time, as the central lever 4 moves, the position of the operating handle 3 will also move downward, so that the operating handle 3 is placed in the power-off position.

[0050] Reference Figure 1 、 Figure 2 A bimetallic strip 14 is provided in the circuit breaker. The bimetallic strip 14 is formed by two metal sheets with different thermal expansion coefficients pressed together. The bimetallic strip 14 is connected to the central lever 4 and can control the movement of the lever.

[0051] When too many electrical appliances are connected to a circuit, the increased current in the circuit can cause overload, generating significant heat. If this heat continues to build up and becomes difficult to dissipate, it can damage wires and other equipment, potentially causing a fire. However, due to the presence of a circuit breaker, when excessive current flows through the conductive element 9 connecting the circuits within the circuit breaker, the bimetallic strip 14 can bend. The metal with a higher thermal expansion coefficient bends more than the metal with a lower thermal expansion coefficient. This causes the bimetallic strip 14 to pull on the central lever 4, disconnecting the conductive element 9. The movement of the central lever 4 also places the operating handle 3 in the power-off position.

[0052] Reference Figure 1 、 Figure 2Inside the circuit breaker, a conductive member 9 is installed. This member consists of an upper component 10 and a lower component 11. The upper component 10 is electrically connected to the magnetic coil 6, while the lower component 11 is mounted on a bimetallic strip 14 and electrically connected to the metal plate 13 of the arc extinguishing chamber 12. When the operating handle 3 is in the initial position, the upper component 10 and the lower component 11 are in close contact, allowing current to flow through the circuit breaker and the external circuit. When the operating handle 3 is in the power-off position, the upper component 10 and the lower component 11 no longer have any contact points. At this point, the circuit in which the circuit breaker is located cannot form a closed loop and the circuit will be disconnected.

[0053] Reference Figure 1 、 Figure 2 A clamping plate 15 is provided on the outside of the outer shell 1. Two clamping plates 15 are provided, one on each side of the operating handle 3. Slide rails 16 are provided on the clamping plates 15 to align with the rotational trajectory of the operating handle 3. The operating handle 3 can slide along the track of the slide rails 16. An initial groove 17, a transition groove 18, and a reset groove 19 are provided along the track of the operating handle 3 from top to bottom. The operating handle 3 is provided with a shifting member 29 that can be inserted into the initial groove 17, the transition groove 18, and the reset groove 19.

[0054] When too many high-power electrical appliances are operating simultaneously on the circuit breaker's circuit, the bimetallic strip 14 will bend and move the central lever 4. As the central lever 4 moves, the operating handle 3 will disengage from its initial position. The shift member 29, originally located in the initial groove 17, will also move out of the initial groove 17 and toward the transition groove 18 as the operating handle 3 moves. When the shift member 29 moves into the transition groove 18, the central lever 4 and the lower member 11 are in close proximity or contact. The shift member 29 will then move out of the transition groove 18 and between the transition groove 18 and the reset groove 19, at which point the central lever 4 will press down on the lower member 11, separating the upper member 10 from the lower member 11.

[0055] Reference Figure 1 、 Figure 2 A reset member 20 is also provided in the sliding rail 16 , and the reset member 20 includes a lower reset spring 27 , one end of the lower reset spring 27 is fixedly connected to the bottom rail wall of the sliding rail 16 , and the other end of the lower reset spring 27 is fixedly connected to the gear member 29 .

[0056] When the shift member 29 slides within the transition groove 18 and the return groove 19, the lower return spring 27 is in a compressed state, which drives the shift member 29 toward the transition groove 18, causing the shift member 29 to enter the transition groove 18. However, since the bimetallic strip 14 is in a bent state at high temperature, the force exerted by the bimetallic strip 14 on the central lever 4 is greater than the elastic force of the lower return spring 27. Therefore, before the bimetallic strip 14 recovers, the lower return spring 27 cannot push the shift member 29.

[0057] After the bimetallic strip 14 separates the conductive member 9, the high-power electrical appliances within the circuit will cease operation due to the temporary lack of current. The bimetallic strip 14, free from the sustained high temperature, will slowly return to its original shape from its bent shape. The shift member 29, under the action of the lower return spring 27, will then enter and engage within the transition groove 18. As the shift member 29 slides toward the transition groove 18, the end of the central lever 4 pressing against the lower member 11 will slowly lift until the shift member 29 enters the transition groove 18. At this point, the central lever 4 will no longer press against the lower member 11, and the upper member 10 and lower member 11 will once again be in close contact, forming a closed circuit for the circuit breaker. At this point, after a brief power outage, the user will be informed that the temporary power outage was caused by excessive current in the circuit, and that the previous temporary power outage also disabled the high-power electrical appliances within the circuit breaker. After the bimetallic strip 14 cools down and recovers, the circuit quickly returns to a closed loop state, which also makes it convenient for the user to not have to turn the operating handle 3 of the circuit breaker.

[0058] However, if the shift member 29 is located in the transition groove 18 and the current in the circuit continues to increase, causing the bimetallic strip 14 to bend again, the bimetallic strip 14 will press the central lever 4 downward again. In this embodiment, when the shift member 29 is located in the transition groove 18, the central lever 4 and the lower component 11 are in close contact, but a gap exists between the bimetallic strip 14 and the central lever 4. When the shift member 29 is released from the transition groove 18 and moves toward the reset groove 19, the bimetallic strip 14 will also move toward the central lever 4 until the shift member 29 is inserted into the reset groove 19. At this time, the bimetallic strip 14 contacts and presses the central lever 4 again. The central lever 4, under the action of the bimetallic strip 14, presses the lower component 11 again, separating the upper component 10 from the lower component 11. At this time, the shift member 29, which has entered the reset groove 19, will remain in the reset groove 19, keeping the circuit breaker in the disconnected state. The operating handle 3 is now in the power-off position.

[0059] Reference Figure 3 、 Figure 4The notches of the initial groove 17 and the transition groove 18 facing the reset groove 19 are both provided with an inclined slope 24 , and the other slopes of the initial groove 17 and the transition groove 18 are both rectangular end surfaces 25 .

[0060] Reference Figure 1 、 Figure 2 An adjustment box 21 is provided on the outer wall of the central lever 4 facing the core 8. The opening of the adjustment box 21 faces the core 8, and an elastic cloth 22 is adhered to the opening. The adjustment box 21 is filled with a non-Newtonian fluid. An expansion chamber 23 is defined between the central lever 4 and the adjustment box 21. The non-Newtonian fluid can flow from the expansion chamber 23 into the adjustment box 21 or back into the expansion chamber 23 from the adjustment box 21.

[0061] When the shift member 29 of the operating handle 3 is in the initial position, the end of the central lever 4 containing the adjustment box 21 is horizontal. The non-Newtonian fluid fully fills the expansion chamber 23, while a portion is evenly distributed within the adjustment box 21, forming a thin layer within the adjustment box 21. If a short circuit occurs in the circuit breaker, the non-Newtonian fluid will be mostly concentrated in the expansion chamber 23, with very little remaining in the adjustment box 21. Therefore, the non-Newtonian fluid will not significantly interfere with the impact of the iron core 8.

[0062] However, if the shift member 29 of the operating handle 3 is in the transition position, the end of the central lever 4 with the regulating box 21 is tilted. The non-Newtonian fluid in the expansion chamber 23 will flow into the regulating box 21 and accumulate in the corner of the regulating box 21 directly below the iron core 8. At this point, the liquid level of the non-Newtonian fluid will be much higher than when the regulating box 21 is horizontal. Furthermore, because the iron core 8 impacts the non-Newtonian fluid at an extremely high speed, and non-Newtonian fluids become very hard when subjected to rapid impact, the iron core 8 presses the liquid level of the non-Newtonian fluid as it impacts the non-Newtonian fluid, forcing the operating handle 3 directly into the power-off position. The height created by the accumulation of non-Newtonian fluid in the corner of the regulating box 21 compensates for the height reduction of the central lever 4 when tilted, thereby avoiding the problem of insufficient impact force on the central lever 4 caused by the iron core 8 due to the height difference.

[0063] Reference Figure 3 、 Figure 4The shift member 29 includes a displacement member 30, a shift block 31 and a shift spring 32. The displacement member 30 is integrally formed with the operating handle 3 and can slide in the sliding cavity, and a cavity for the shift block 31 is also provided in the displacement member 30. One end of the shift block 31 is rotatably connected to the displacement member 30, and the shift block 31 can be rotated to shrink inside the cavity. The shape of the shift block 31 is the same as the slot shape of the transition groove 18. When the shift block 31 enters the initial groove 17 or the transition groove 18, the shift block 31 will fit into the initial groove 17 or the transition groove 18. The shift spring 32 is located in the cavity, and one end of the shift spring 32 is fixedly connected to the displacement member 30, and the other end of the shift spring 32 is fixedly connected to the free end of the shift block 31. If the shift member 29 moves from the initial groove 17 to the transition groove 18 or from the transition groove 18 to the reset groove 19 , the shift spring 32 will contract to drive the shift block 31 with a larger area to retract into the cavity.

[0064] Reference Figure 3 、 Figure 4 as well as Figure 5 A rebound assembly 34 is also provided in the clamping plate 15 for rebounding the shifting member from the transition groove 18 or the reset groove 19 to the initial groove 17. Two rebound cavities 33 are defined in the clamping plate 15 and are communicated with the transition groove 18 and the reset groove 19, respectively. The rebound assembly 34 is located in each of the rebound cavities 33.

[0065] The rebound assembly 34 includes a rebound block 35 and a rebound spring 36. One end of the rebound spring 36 is fixedly connected to the rebound chamber 33, and the other end of the rebound spring 36 is fixedly connected to the rebound block 35. Under the elastic action of the rebound spring 36, the rebound block 35 can enter the transition groove 18 or the reset groove 19 to move the shift block located in the transition groove 18 or the reset groove 19 out. The rebound block 35 is also integrally provided with a hand grip 37 that passes through the splint 15 and slides on the splint 15. The end of the hand grip 37 that passes through the outside of the splint 15 is also connected to a parallel rod. The hand grip 37 located on the same side of the splint 15 is connected to the same parallel rod. The movement of the parallel rod drives the two rebound blocks 35 to move simultaneously. When the two rebound blocks 35 move toward the shift member 29 at the same time, the rebound spring 36 is in a stretched state. At this time, the rebound block 35 squeezes the shift member 29 out of the transition groove 18 or the reset groove 19, and the rebound block 35 blocks the transition groove 18 or the reset groove 19, causing the shift block to retract into the displacement member 30 and can only enter the initial groove 17, thereby resetting the circuit breaker.

[0066] Reference Figure 5 、 Figure 6The reset member 20 also includes an upper return spring 26. One end of the upper return spring 26 is fixedly connected to the side of the slide rail 16 near the initial groove 17, and the other end is fixedly connected to the operating handle 3. The elastic coefficient of the upper return spring 26 is smaller than that of the lower return spring 27. When the operating handle 3 is in the initial position, the upper return spring 26 has little pulling effect on the operating handle 3 because the elastic coefficient of the upper return spring 26 is smaller than that of the lower return spring 27. However, when the operating handle 3 is in the reset position, the elastic force of the lower return spring 27 is at its maximum. At this time, the lower return spring 27 pushes the operating handle 3, causing the operating handle 3 to enter the initial position. The upper return spring 26 can then mitigate the impact force of the operating handle 3, thereby protecting the clamping plate 15 and the operating handle 3 from severe impact.

[0067] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A miniature circuit breaker, characterized in that: include: An outer shell (1) for storing electronic components; A trigger mechanism (2) is installed in the outer shell (1); The trigger mechanism (2) comprises: An operating handle (3) is rotatably connected to the interior of the outer shell (1), with an end portion exposed to the exterior of the outer shell (1). The operating handle (3) has an initial position and a power-off position. When the operating handle (3) is in the initial position, the circuit is connected; when the operating handle (3) is in the power-off position, the circuit is disconnected. A central lever (4) is used to control whether the circuit is conductive, and a driving member (28) is connected to the operating handle (3); A coil assembly (5) is installed in the outer shell (1); The coil assembly (5) comprises: A magnetic coil (6), wherein the magnetic coil (6) is enclosed in a plastic shell (7), the outer side of the magnetic coil (6) is coated with an insulating material, and the magnetic coil (6) itself can be energized; An iron core (8) is movably connected to the plastic shell (7), and the iron core (8) is capable of pushing the central lever (4); A conductive member (9) is used to connect the miniature circuit breaker to the power supply circuit of the external circuit, wherein when the operating handle (3) is in the initial position, the conductive member (9) is connected, and when the operating handle (3) is in the power-off position, the conductive member (9) is disconnected; An arc extinguishing chamber (12) having a plurality of parallel metal plates (13) disposed therein; A bimetallic strip (14) is installed in the outer shell (1), the bimetallic strip (14) comprising two metal strips with different thermal expansion coefficients that are tightly attached together, the bimetallic strip (14) being connected to the central lever (4) and capable of driving the central lever (4) to move; A clamping plate (15) is located outside the outer shell (1), the operating handle (3) is located inside the clamping plate (15), and the clamping plate (15) is provided with a sliding rail (16) that is consistent with the rotation trajectory of the operating handle (3); an initial groove (17), a transition groove (18) and a reset groove (19) are sequentially provided on the clamping plate (15); when the operating handle (3) is located between the transition groove (18) and the reset groove (19), the conductive member (9) is disconnected; when the operating handle (3) is located between the initial groove (17) and the transition groove (18), the conductive member (9) is closed; The reset member (20) is located in the sliding rail (16). When the operating handle (3) enters the reset groove (19), the reset member (20) causes the operating handle (3) to return to the initial groove (17).

2. A miniature circuit breaker according to claim 1, characterized in that: The conductive member (9) comprises an upper member (10) and a lower member (11), one end of the lower member (11) is connected to a metal plate (13) of an arc extinguishing chamber (12), and the upper member (10) is connected to a coil assembly (5). When the circuit is on, the upper member (10) and the lower member (11) are in close contact; when the circuit is off, the upper member (10) and the lower member (11) are separated. An adjusting box (21) is fixedly connected to the central lever (4), the opening of the adjusting box (21) faces the iron core (8) and is bonded with an elastic cloth (22). Non-Newtonian fluid is placed in the adjusting box (21), and when the adjusting box (21) is tilted, the non-Newtonian fluid is concentrated at the corners of the adjusting box (21). An expansion cavity (23) is also provided between the central lever (4) and the adjusting box (21), and the non-Newtonian fluid can enter the adjusting box (21) through the expansion cavity (23).

3. The miniature circuit breaker according to claim 1, characterized in that: The notches of the initial groove (17) and the transition groove (18) facing the reset groove (19) are both provided with inclined slopes (24), and the other slopes of the initial groove (17) and the transition groove (18) are both rectangular end surfaces (25).

4. A miniature circuit breaker according to claim 3, characterized in that: The reset member (20) includes a lower reset spring (27), one end of which is fixedly connected to one end of the slide rail (16) close to the reset groove (19), and the other end of which is fixedly connected to the operating handle (3). When the operating handle (3) is located at the initial position, the lower reset spring (27) is in an unstressed state.

5. The miniature circuit breaker according to claim 1, characterized in that: The reset member (20) further includes an upper reset spring (26), one end of which is fixedly connected to a side of the slide rail (16) close to the initial groove (17), and the other end of which is fixedly connected to the operating handle (3). The elastic coefficient of the upper reset spring (26) is smaller than the elastic coefficient of the lower reset spring (27). When the operating handle (3) is located at the initial position, the upper reset spring (26) is in a compressed state.

6. The miniature circuit breaker according to claim 3, characterized in that: The operating handle is further provided with a shift member (29) capable of positioning the operating handle, and the shift member (29) includes a displacement member (30), a shift block (31) and a shift spring (32); the shape of the shift block (31) is the same as the slot shape of the transition groove (18); the displacement member (30) slides in the sliding rail (16); one end of the shift block (31) is rotatably connected to the displacement member (30), one end of the shift spring (32) is fixedly connected to the displacement member (30), and the other end of the shift spring (32) is fixedly connected to the free end of the shift block (31).

7. The miniature circuit breaker according to claim 5, characterized in that: The splint (15) is also provided with a rebound component (34), and a rebound cavity (33) is opened in the splint (15), and the rebound cavity (33) is communicated with the transition groove (18) and the reset groove (19). The rebound component (34) is located in the rebound cavity (33), and the rebound component (34) includes a rebound block (35) and a rebound spring (36). One end of the rebound spring (36) is fixedly connected to the rebound cavity (33), and the other end of the rebound spring (36) is fixedly connected to the rebound block (35). The end of the rebound block (35) fixedly connected to the rebound spring (36) can enter the transition groove (18) or the reset groove (19), and the rebound block (35) is also integrally formed with a hand grip (37) that passes through the splint (15) and slides on the splint (15).

8. The miniature circuit breaker according to claim 7, characterized in that: A parallel rod is provided at the free end of the hand grip (37) located at the transition groove (18) and the reset groove (19), and the two ends of the hand grip (37) are respectively fixedly connected to the two ends of the parallel rod.

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