A circuit breaker

Abstract

A kind of circuit breaker, including operating mechanism and drive module, the drive module includes control circuit, motor and transmission mechanism, the control circuit includes the closing circuit and the opening circuit of drive motor to carry out closing or opening rotation, the opening circuit and closing circuit are respectively connected with one-way conducting element in series, drive motor is rotated by the opening circuit after conducting, closing circuit, the on-off of auxiliary circuit is controlled by first micro switch, transmission mechanism triggers first micro switch to turn on auxiliary circuit when carrying out opening and closing rotation, when circuit breaker is closed or opened, the conducting state of transmission mechanism is switched first by closing circuit and opening circuit, the auxiliary circuit drive motor continues to rotate in conducting state, and first micro switch is triggered again to open auxiliary circuit when transmission mechanism is closed in place or opened in place. The control circuit of the application is simple, and accurate and efficient control of motor is realized by cooperation with transmission mechanism.

Description

Technical Field

[0001] This invention relates to low-voltage electrical appliances, and more specifically to a circuit breaker. Background Technology

[0002] A circuit breaker is a common switching element used in power systems to connect and disconnect circuits, and to automatically disconnect the circuit in the event of an overcurrent or leakage fault. Circuit breakers typically have automatic opening and closing functions, but these functions are mostly achieved through gear mechanisms. When the circuit breaker performs closing and opening movements, the gear mechanism's rotation for each movement usually requires complex physical structures and circuits, resulting in a complex overall structure. Furthermore, if the gear mechanism always rotates in one direction, it is prone to malfunctions due to poor coordination, reducing its reliability. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a circuit breaker with a simple structure and high reliability.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A circuit breaker includes an operating mechanism and a drive module. The drive module cooperates with the operating mechanism to realize the automatic opening and closing of the circuit breaker. The drive module includes a control circuit, a motor connected to the control circuit, and a transmission mechanism driven by the motor.

[0006] The control circuit includes a parallel closing line and a tripping line, with one closing line and the other tripping line kept in a closed-circuit state. A unidirectional conducting element is connected in series in both the closing and tripping lines, and the current conduction direction of the unidirectional conducting elements in the tripping and closing lines is opposite. When the closing line is closed, a closing voltage is applied to the closing line to drive the motor to rotate in closing mode. When the tripping line is closed, a tripping voltage with the opposite polarity to the closing voltage is applied to the tripping line to drive the motor to rotate in opening mode. The control circuit also includes an auxiliary line connected in parallel with the closing and tripping lines. The on / off state of the auxiliary line is controlled by a first micro switch. When the transmission mechanism rotates in the closing or tripping position, it triggers the first micro switch to open the auxiliary line. When the circuit breaker is closed or tripped, the transmission mechanism first triggers the switching of the closing and tripping lines' conduction states. The auxiliary line in the conducting state drives the motor to continue rotating. When the transmission mechanism is closed or tripped, it triggers the first micro switch to disconnect the auxiliary line.

[0007] Furthermore, the opening and closing of the circuit breaker is controlled by the second micro switch and the third micro switch, respectively. When the circuit breaker is closed or open, the transmission mechanism simultaneously triggers the second micro switch and the third micro switch to control the opening and closing of the circuit breaker.

[0008] Furthermore, the closing circuit and the opening circuit are controlled by a set of normally closed contacts and a set of normally open contacts. The opening and closing of the normally closed contacts are controlled by a second micro switch and a third micro switch, respectively. The transmission mechanism keeps the closing circuit and the opening circuit connected and disconnected by triggering the second micro switch and the third micro switch.

[0009] Furthermore, the second micro switch and the third micro switch are linked by a button. When the circuit breaker is closed, the transmission mechanism triggers the second micro switch and the third micro switch to switch the conduction state of the closing line and the opening line.

[0010] Furthermore, when the circuit breaker moves from open to closed, the motor is driven by the conducting closing line and auxiliary line to perform the closing rotation. When the circuit breaker moves from closed to open, the motor is first driven by the conducting opening line to perform the opening rotation, and then the motor is driven by the conducting auxiliary line to continue the opening rotation.

[0011] Furthermore, the transmission mechanism includes a first incomplete gear and a lever that are respectively linked to the motor and the operating mechanism. The first incomplete gear is used to trigger a first micro switch, and the lever is used to trigger a second micro switch and a third micro switch. The first micro switch is fixedly disposed on one side of the first incomplete gear, and the second and third micro switches are fixedly disposed between the lever and the operating mechanism.

[0012] Furthermore, the first incomplete gear includes a first sector gear section. When the transmission mechanism is closed, the head end of the first sector gear section abuts against the button of the first micro switch. After the transmission mechanism is opened, the tail end of the first sector gear section abuts against the button of the first micro switch. During the opening and closing rotation, the first sector gear section separates from the button of the first micro switch.

[0013] Furthermore, the lever includes a fan-shaped lever body, with a shaft hole at one end and a connecting hole at the other end. The connecting hole is used for linkage connection with the linkage of the operating mechanism. The second micro switch and the third micro switch are located on the side of the lever body near the connecting hole. When the circuit breaker is closed or opened, the second micro switch and the third micro switch are triggered simultaneously by the side wall of the lever body. When the circuit breaker is opened or closed, one end of the lever body moves away from the second micro switch and the third micro switch.

[0014] Furthermore, the transmission mechanism also includes a second incomplete gear, which is coaxially and rotatably assembled with the lever and driven to engage with it. The second incomplete gear engages with the first incomplete gear, and the first incomplete gear drives the second incomplete gear to perform opening and closing rotations. During the opening and closing process, the first incomplete gear engages with the second incomplete gear located in the initial position, causing the second incomplete gear to drive the lever to perform opening or closing rotations, with the opening and closing rotations in opposite directions.

[0015] Furthermore, the operating mechanism includes a rotating plate rotatably mounted inside the housing, on which a jump buckle and a lock buckle are rotatably disposed. One end of the jump buckle and the lock buckle are fastened together, and one end of the jump buckle is connected to a connecting rod, which is used for linkage connection with the lever of the transmission mechanism.

[0016] The present invention discloses a circuit breaker in which the closing and opening circuits are switched by a transmission mechanism when the circuit breaker is in the opening or closing position, ensuring that the circuit switching is not premature or delayed. In addition, during the motor's opening and closing rotation, the auxiliary circuit conducted by the transmission mechanism is disconnected only after the switching of the closing and opening circuits, enabling the motor to complete the opening or closing operation. The control circuit is simple and can accurately and efficiently control the motor's start-up, shutdown, opening and closing rotation.

[0017] Furthermore, the second and third microswitches are in a closed and open state, and the buttons of the two microswitches are linked. The lever completes the circuit switching and conduction by triggering one of the microswitches, avoiding malfunctions. It has the advantages of simple structure and high degree of coordination. Attached Figure Description

[0018] Figure 1-2 This is a schematic diagram of the drive module in this invention;

[0019] Figure 3 This is a schematic diagram of the structure of the drive module and the operating mechanism when the transmission mechanism is in the closed position in this invention;

[0020] Figure 4 This is a schematic diagram of the structure of the drive module and the operating mechanism in the present invention when the transmission mechanism is in the open position;

[0021] Figure 5 This is a schematic diagram of the structure of the second incomplete gear and the return spring in the initial position in this invention;

[0022] Figure 6 This is a schematic diagram of the structure of the second incomplete gear and the reset spring when the circuit breaker is closed in the correct position in this invention;

[0023] Figure 7This is a schematic diagram of the structure of the second incomplete gear and the reset spring when the circuit breaker is in the tripped position in this invention;

[0024] Figure 8 This is a schematic diagram of the structure of the first incomplete gear and the second incomplete gear in this invention;

[0025] Figure 9 This is a schematic diagram of the structure of the second incomplete gear and lever in this invention;

[0026] Figure 10 This is a schematic diagram of the structure of the second incomplete gear in this invention;

[0027] Figure 11 This is a schematic diagram of the lever structure in this invention;

[0028] Figure 12 This is a circuit diagram of the control circuit in the open state in this invention;

[0029] Figure 13 This is a circuit diagram of the control circuit in this invention, showing the process from opening to closing the circuit.

[0030] Figure 14 This is a circuit diagram of the control circuit in the closed state in this invention;

[0031] Figure 15 This is a circuit diagram of the control circuit in the process of closing and opening the circuit in this invention. Detailed Implementation

[0032] The following is in conjunction with the appendix Figures 1 to 15 The given embodiments further illustrate specific implementations of a circuit breaker according to the present invention. The circuit breaker of the present invention is not limited to the descriptions of the following embodiments.

[0033] A circuit breaker includes a housing 6 and a manual operating component, an operating mechanism 5, and a contact mechanism disposed within the housing 6. The manual operating component is linked to the operating mechanism 5. The contact mechanism includes a cooperating moving contact and a stationary contact. The moving contact is linked to the operating mechanism 5. The manual operating component drives the operating mechanism 5 to move the moving contact away from or towards the stationary contact, thus manually opening and closing the circuit breaker. The manual operating component can be a handle mechanism rotated on the housing 6 or a button mechanism slidably engaged with the housing 6. An arc-extinguishing device is provided on one side of the contact mechanism to extinguish the electric arc generated during the opening and closing of the contact mechanism. An overload protection mechanism and / or a short-circuit protection mechanism cooperating with the operating mechanism 5 may also be installed within the housing 6. In the event of an overload or short-circuit fault, the overload protection mechanism or the short-circuit protection mechanism triggers the operating mechanism 5 to trip, thereby realizing the protection function of the circuit breaker.

[0034] A drive module, linked to the operating mechanism 5, is also installed inside the housing 6. The drive module works in conjunction with the operating mechanism 5 to achieve automatic opening and closing of the circuit breaker. The drive module includes a control circuit, a motor M, and a transmission mechanism. The control circuit includes a closing line and a opening line. By applying closing voltages and opening voltages of opposite polarities to the closing line and opening line respectively, the motor M rotates in opposite directions for closing and opening, thereby causing the transmission mechanism connected to the motor M to drive the operating mechanism 5 to perform opening and closing actions.

[0035] One improvement of this application is that, Figure 1-4 As shown, the transmission mechanism includes a first incomplete gear 1, a second incomplete gear 2, and a lever 3 rotatably mounted inside the housing 6. A return spring 4 is mounted between the second incomplete gear 2 and the housing 6. The operating mechanism 5 is linked to the lever 3. The lever 3 is coaxially mounted with the second incomplete gear 2 and drives it. During the opening and closing process, the first incomplete gear 1 and the second incomplete gear 2, which is in its initial position, cooperate to drive the lever 3 to rotate for opening or closing. After the circuit breaker is closed or opened, the return spring 4 drives the second incomplete gear 2 back to its initial position. The directions of opening and closing rotations are opposite. The two incomplete gears in the transmission mechanism rotate in cooperation, and the second incomplete gear 2 is driven to reset by the return spring 4 after the circuit breaker is in the opening or closing position. Its structure and cooperation process are simple, and it will not cause malfunctions due to poor cooperation caused by a single rotation direction, thus having the advantage of high reliability.

[0036] Specifically, such as Figure 8 As shown, when the first incomplete gear 1 is driven by the motor M to perform a closing rotation, the first incomplete gear 1 meshes with the second incomplete gear 2 to drive the second incomplete gear 2 to perform a closing rotation. The return spring 4 stores energy. After the circuit breaker is closed, the first incomplete gear 1 and the second incomplete gear 2 separate, and the return spring 4 releases energy to make the second incomplete gear 2 rotate back to its initial position. When the first incomplete gear 1 is driven by the motor M to perform a opening rotation, the first incomplete gear 1 pushes the second incomplete gear 2 to perform a opening rotation. The return spring 4 stores energy. After the circuit breaker is opened, the return spring 4 releases energy to make the second incomplete gear 2 rotate back to its initial position. The opening rotation and closing rotation of the second incomplete gear 2 are in opposite directions.

[0037] like Figure 9As shown, the lever 3 and the second incomplete gear 2 are coaxially assembled and driven together. The lever 3 and the second incomplete gear 2 can be stacked or staggered. However, when staggered, the second incomplete gear 2 needs to reserve enough space for the lever 3 to swing. The second incomplete gear 2 is provided with a closing part 221 and a disengaging part 222. The lever 3 is provided with a first stop part 31 and a second stop part 32. The closing part 221 and the first stop part 31 cooperate to drive the lever 3 to close and rotate. The disengaging part 222 and the second stop part 32 cooperate to drive the lever 3 to open and rotate. The closing part 221 and the first stop part 31, and the disengaging part 222 and the second stop part 32 can each be two mutually cooperating boss structures, or a mutually cooperating boss and groove structure.

[0038] The reset spring 4 stores and releases energy through a mutually cooperating dynamic limiting part 26 and a static limiting part 61. The dynamic limiting part 26 is disposed on the second incomplete gear 2, and the static limiting part 61 is disposed on the inner wall of the outer shell 6 on one side of the second incomplete gear 2. The dynamic limiting part 26 rotates circumferentially with the second incomplete gear 2 on one side of the static limiting part 61. The reset spring 4 includes a spring body and a first elastic arm 41 and a second elastic arm 42 extending from both ends of the spring body. The spring body is coaxially and rotatably assembled with the second incomplete gear 2. The first elastic arm 41 and the second elastic arm 42 are respectively disposed along both sides of the dynamic limiting part 26 and extend to both sides of the static limiting part 61.

[0039] like Figure 5 As shown, in the initial position, the moving limit part 26 and the stationary limit part 61 are directly opposite each other. At this time, the first elastic arm 41 is simultaneously attached to one side of both the moving limit part 26 and the stationary limit part 61, and the second elastic arm 42 is simultaneously attached to the other side of both the moving limit part 26 and the stationary limit part 61. Figure 6 As shown, when the second incomplete gear 2 rotates to close, the moving limit part 26 pushes the first elastic arm 41 to separate from the stationary limit part 61, causing the moving limit part 26 and the stationary limit part 61 to misalign. The second elastic arm 42 is limited by the stationary limit part 61, thus widening the gap between the first elastic arm 41 and the second elastic arm 42. This causes the return spring 4 to store energy. After the circuit breaker is closed, the first incomplete gear 1 and the second incomplete gear 2 no longer mesh. The first elastic arm 41 pushes the limit part 26 in the opposite direction, causing the second incomplete gear 2, the moving limit part 26, and the first elastic arm 41 to return to their initial positions. Similarly, as... Figure 7As shown, when the second incomplete gear 2 is rotating to open the circuit, the moving limit part 26 pushes the second elastic arm 42 to separate from the stationary limit part 61, and the moving limit part 26 and the stationary limit part 61 are misaligned. The first elastic arm 41 is limited by the stationary limit part 61, which increases the distance between the first elastic arm 41 and the second elastic arm 42. This causes the reset spring 4 to store energy. After the circuit breaker is in the open position, the first incomplete gear 1 and the second incomplete gear 2 are no longer meshed. The second elastic arm 42 pushes the limit part 26 in the reverse direction, so that the second incomplete gear 2, the moving limit part 26 and the second elastic arm 42 return to their initial positions.

[0040] Another improvement of this application is that the control circuit includes a parallel closing line, a tripping line, and an auxiliary line. The opening and closing of the closing line, tripping line, and auxiliary line are controlled by a second micro switch K2, a third micro switch K3, and a first micro switch K1, respectively. A closing or tripping voltage is applied to the closed or tripping line, causing the motor M to drive the transmission mechanism to perform closing or tripping rotations. During the closing or tripping rotation of the transmission mechanism, the first micro switch K1 is triggered to open the auxiliary circuit. When the circuit breaker is in the closed or tripping position, the transmission mechanism controls the closing and tripping lines by simultaneously triggering the second and third micro switches K2 and K3. After the transmission mechanism is in the tripping or tripping position, the transmission mechanism triggers the first micro switch K1 to disconnect the auxiliary line. The coordination between the transmission mechanism and the control circuit can provide feedback on the position of the transmission mechanism and also achieve precise control of the motor M.

[0041] Specifically, such as Figure 1-4 As shown in Figures 12-15, the first incomplete gear 1 of the transmission mechanism cooperates with the first micro switch K1, and the lever 3 of the transmission mechanism cooperates with the second micro switch K2 and the third micro switch K3. The control circuit includes parallel closing lines, opening lines, and auxiliary lines. Closing or opening voltage is applied through the conducting closing or opening line, causing the motor M to drive the transmission mechanism to perform closing or opening rotation. The closing and opening lines are controlled by a set of linked normally closed and normally open contacts. The opening and closing of the normally open and normally closed contacts are controlled by the second micro switch K2 and the third micro switch K3, respectively. This control circuit is used when the circuit breaker is closed or open. When the brake is in position, lever 3 simultaneously triggers the second micro switch K2 and the third micro switch K3 to switch the circuit between the closing and opening lines. That is, the second micro switch K2 and the third micro switch K3 are implemented by a single integrated micro switch, achieving synchronous linkage. Of course, they can also be set as two independent micro switches as needed. The opening and closing of the auxiliary line is controlled by the first micro switch K1. During the opening and closing rotation of the transmission mechanism, the first incomplete gear 1 cooperates with the first micro switch K1 to make the auxiliary line open. When the transmission mechanism is in the closing and opening positions, the first incomplete gear 1 triggers the first micro switch K1 to disconnect the auxiliary line.

[0042] In this way, the switching of the closing and opening circuits is switched by lever 3 when the circuit breaker is in the opening or closing position, which can ensure that the switching of the circuits is not premature or delayed. In addition, during the opening and closing rotation of motor M, the first incomplete gear 1 controls the conduction of the auxiliary circuit, which can ensure that lever 3 disconnects the auxiliary circuit only after the circuit breaker is fully opened or closed, and the auxiliary circuit continues to drive the motor. The control circuit is simple and can accurately and efficiently control the start and stop of motor M and the opening and closing rotation.

[0043] Furthermore, unidirectional conducting elements are connected in series in both the closing and opening circuits. The current conduction direction of the unidirectional conducting elements in the opening and closing circuits is opposite to that in the closing circuit. When the closing circuit is on, a closing voltage is applied to the closing circuit to drive the motor M to rotate in closing mode. When the opening circuit is on, a opening voltage with the opposite polarity to the closing voltage is applied to the opening circuit to drive the motor M to rotate in opening mode. When switching between the closing and opening circuits, the unidirectional conducting elements prevent the opening voltage from flowing through the closing circuit and the closing voltage from flowing through the opening circuit, thus avoiding accidental triggering of the motor M. The unidirectional conducting element is a diode. Furthermore, after the conduction state of the closing line and the opening line is switched, if the motor M still needs to continue closing or opening rotation, the auxiliary line that is still in the conducting state will drive the motor M to continue rotating. That is, during the closing process, when the closing line is disconnected and the opening line is closed, if the motor M still needs to close, the conducting auxiliary line will continue to provide the closing voltage to the motor M; during the opening process, when the opening line is disconnected and the closing line is conducted, if the motor M still needs to open, the conducting auxiliary line will continue to provide the opening voltage to the motor M.

[0044] Preferably, the first micro switch K1 is fixedly disposed on one side of the first incomplete gear 1, and the second micro switch K2 and the third micro switch K3 are fixedly disposed between the lever 3 and the operating mechanism 5. The buttons of the second micro switch K2 and the third micro switch K3 are linked together. In this way, when the circuit breaker is closed or open, the lever 3 can trigger the button of one of the micro switches to realize the switching of the closing line and the opening line, avoiding malfunction. It has the advantages of simple structure and high degree of coordination.

[0045] Combination Figure 1-15A preferred embodiment of a transmission mechanism, control circuit, and operating mechanism 5 is provided for use in a plug-in circuit breaker. The button mechanism of the plug-in circuit breaker is connected to the lever 3 via a U-shaped rod to realize manual opening and closing. In this embodiment, the transmission mechanism includes a first incomplete gear 1, a second incomplete gear 2, a lever 3, and a return spring 4. Of course, in actual use, the transmission mechanism can also be provided with at least one or more transmission gears.

[0046] like Figure 8 As shown, the first incomplete gear 1 includes a circular gear and a first sector gear section 11. The circular gear is used to mesh with a gear or gear set connected to the output shaft of the motor M. The first sector gear section 11 is coaxially and fixedly connected to the circular gear. In this embodiment, the radius of the first sector gear section 11 is smaller than the radius of the circular gear.

[0047] like Figure 5-10 As shown, the second incomplete gear 2 includes a circular plate 21 with a shaft hole in the middle. The circular plate 21 has a certain thickness. A second sector gear portion 23 is provided along one circumferential sidewall of the circular plate 21. The second sector gear portion 23 can mesh with the first sector gear portion 11. At the same time, the tail end 112 of the first sector gear portion 11 can push the head end 111 of the first sector gear portion 11. A sector-shaped notch 22 is provided along the other circumferential sidewall of the circular plate 21. The two opposite end faces of the notch 22 serve as the closing part 221 and the opening part 222, respectively. In the figure, the opening part 222 is the left end face of the notch 22, and the closing part 221 is the right end face of the notch 22. The stop boss 33 of the lever 3, which is coaxially connected to the circular plate 21 and is staggered, can extend into the fan-shaped notch 22. The two side walls of the stop boss 33 serve as the first stop part 31 and the second stop part 32, respectively, and the first stop part 31 and the second stop part 32 are opposite to the closing part 221 and the opening part 222, respectively.

[0048] like Figure 10 As shown, a receiving groove 24 and a sector-shaped groove 25 are provided on one side of the circular plate 21, which are interconnected. The bottoms of the receiving groove 24 and the sector-shaped groove 25 are on the same plane. The receiving groove 24 is located in the center of the circular plate 21 and is used to assemble the return spring 4. The sector-shaped groove 25 is located between the first end 231 of the second sector gear part 23 and the opening part 222. The sector-shaped groove 25 makes the circular plate 21 thinner on one side and thicker on the other. The thicker side is located between the tail end 232 of the second sector gear part 23 and the closing part 221, and the thinner side is located between the first end 231 of the second sector gear part 23 and the opening part 222. A sector-shaped protrusion as a moving limit part 26 protrudes from the middle of the sector-shaped groove 25. The moving limit part 26 divides the sector-shaped groove 25 into two parts. A static limit part 61 is provided on one side of the outer casing 6, as shown. Figure 5-7As shown, the stationary limiting part 61 is a fan-shaped boss. The stationary limiting part 61 and the moving limiting part 26 share the same center and their central angles are equal. When the second incomplete gear 2 is in the initial position, the moving limiting part 26 and the stationary limiting part 61 are directly opposite each other. During the closing or opening operation, the moving limiting part 26 rotates to both sides of the stationary limiting part 61, so that the moving limiting part 26 and the stationary limiting part 61 are misaligned. Preferably, a gap is left between the stationary limiting part 61 and the second incomplete gear 2 so that the stationary limiting part 61 will not interfere with the rotation of the second incomplete gear 2.

[0049] like Figure 9 , 11 As shown, the lever 3 includes a fan-shaped lever body. A shaft hole is provided at one end of the lever body, through which the lever body is coaxially assembled with the second incomplete gear 2. A connecting hole 34 is provided at the other end of the lever body, and a stop boss 33 protruding from the lever body is provided on one side of the connecting hole 34. Figure 9 , 11 The stop boss 33 protrudes in a direction perpendicular to the rotation axis of the lever body, so that the stop boss 33 can extend into the notch 22 of the second incomplete gear 2. The stop boss 33 is much smaller than the notch 22, so that the stop boss 33 can swing within the notch 22. The side wall of the stop boss 33 facing the connecting hole 34 is the first stop part 31, which is opposite to the closing part 221. The side wall of the stop boss 33 facing away from the connecting hole 34 is the second stop part 32, which is opposite to the opening part 222.

[0050] like Figure 5-7 As shown, the return spring 4 is preferably a torsion spring. The return spring 4 includes a spring body and a first elastic arm 41 and a second elastic arm 42 extending from both ends of the spring body. The spring body is assembled in the receiving groove 24 of the second incomplete gear 2 and is coaxially connected with the second incomplete gear 2. Preferably, the outer side wall of the spring body is in contact with the inner side wall of the receiving groove 24 and the inner side wall of the moving limiting part 26, respectively. The first elastic arm 41 and the second elastic arm 42 are respectively arranged along both sides of the moving limiting part 26 and extend to both sides of the static limiting part 61. The first elastic arm 41 of the return spring 4 swings between the moving limiting part 26 and the first end 231 of the second sector gear part 23, and the second elastic arm 42 of the return spring 4 swings between the moving limiting part 26 and the tail end 232 of the second sector gear part 23.

[0051] like Figure 3 , 4As shown, the operating mechanism 5 includes a rotating plate 51 rotatably mounted inside the housing 6. A trip latch 52 and a locking latch 53 are rotatably mounted on the rotating plate 51. One end of the trip latch 52 and the locking latch 53 are engaged. One end of the trip latch 52 is connected to a connecting rod 54 that is linked to the lever 3. One end of the connecting rod 54 is inserted into the connecting hole 34 of the lever 3, and the other end is inserted into the trip latch 52. The rotating plate 51 is connected to the moving contact. The rotation of the lever 3 drives the rotating plate 51 to rotate via the connecting rod 54 and the trip latch 52, driving the moving contact to engage with the stationary contact to achieve opening and closing of the circuit breaker. In the event of an overload or short circuit fault, the overload protection mechanism or the short circuit protection mechanism drives the locking latch 53 to release the engagement of the trip latch 52 and the locking latch 53, causing the operating mechanism 5 to disengage, thereby realizing the protection function of the circuit breaker.

[0052] like Figure 12-15 As shown, the control circuit includes a closing circuit, a opening circuit, and an auxiliary circuit. The closing circuit includes a second micro switch K2 and a diode D2. The opening circuit includes a third micro switch K3 and a diode D3. The auxiliary circuit includes a first micro switch K1. The first end of the first micro switch K1 is connected to the anode of diode D2 and the cathode of diode D3. The second ends of the first micro switch K1, the second micro switch K2, and the third micro switch K3 are connected together in series with the motor M. The first end of the second micro switch K2 is connected to the cathode of diode D2, and the first end of the third micro switch K3 is connected to the anode of diode D3.

[0053] like Figure 3 , 4 As shown, the first micro switch K1 is fixedly disposed on one side of the first incomplete gear 1. The button of the first micro switch K1 is located on the side where the first sector gear part 11 is provided, so that the first end 111 and the tail end 112 of the first sector gear part 11 can abut against each other to trigger the first micro switch K1. Of course, a corresponding boss can be provided on the first sector gear part 11 to trigger the first micro switch K1. The second micro switch K2 and the third micro switch K3 are fixedly disposed between the lever 3 and the operating mechanism 5, specifically disposed on one side of the lever 3, preferably on the lever body side near the connecting hole 34. The buttons of the second micro switch K2 and the third micro switch K3 are linked, and the second micro switch K2 and the third micro switch K3 maintain a state where one is open and the other is closed. When the circuit breaker is closed, as Figure 3 As shown, the second microswitch K2 and the third microswitch K3 are simultaneously triggered by the side wall of the lever body. When the circuit breaker is in the open position or before the circuit breaker is in the open position, one end of the lever body has already moved away from the second microswitch K2 and the third microswitch K3 simultaneously. Figure 4In this configuration, one end of the lever body with the shaft hole exits from the second micro switch K2 and the third micro switch K3. Of course, when the circuit breaker is in the open position, the second micro switch K2 and the third micro switch K3 are simultaneously triggered by the side wall of the lever body. When the circuit breaker is in the closed position or before it is in the closed position, one end of the lever body has already exited from the second micro switch K2 and the third micro switch K3.

[0054] In this embodiment, the circuit breaker closing position means that the lever 3 is driven to the closing position, and the lever 3 drives the operating mechanism 5 to complete the closing action. The transmission mechanism closing position means that after the first incomplete gear 1 and the second incomplete gear 2 are separated, the second incomplete gear 2 is reset and the first incomplete gear 1 rotates to the closing position. The circuit breaker opening position means that the lever is driven to the opening position, and the lever 3 drives the operating mechanism 5 to complete the opening action. The transmission mechanism opening position means that after the first incomplete gear 1 and the second incomplete gear 2 are separated, the second incomplete gear 2 is reset and the first incomplete gear 1 rotates to the opening position. Therefore, it can be seen that when the circuit breaker is closed or opened, the transmission mechanism still needs to rotate for a period of time before it is closed or opened.

[0055] Specific work process:

[0056] Taking the second micro switch K2 set in the closed position of lever 3, and the second micro switch K2 and the third micro switch K3 linked by a button as an example, the second micro switch K2 controls the normally closed contact, and the third micro switch K3 controls the normally open contact.

[0057] The process from the open position to the closed position of the transmission mechanism: When in the open position (both the transmission mechanism and the circuit breaker are in the open position), the tail end 112 of the first sector gear 11 abuts against the button of the first micro switch K1, making the auxiliary circuit disconnected. The end of the lever 3 is not pressed against the buttons of the second micro switch K2 and the third micro switch K3, making the closing circuit conductive and the open circuit disconnected. At this time, by applying a closing voltage to the control circuit, current flows through the closing circuit. Figure 12 , 13 The current flows from left to right, causing motor M to rotate when the circuit is closed. The transmission mechanism connected to motor M also rotates when the circuit is closed. Figure 4 As shown, with the closing and rotation of the first incomplete gear 1, the tail end 112 of the first sector gear 11 separates from the button of the first micro switch K1, thus connecting the auxiliary circuit (see...). Figure 13The first sector gear 11's head end 111 engages with the second sector gear 23's head end 231, which is in the initial position, to drive the second incomplete gear 2 to rotate for closing. While the second incomplete gear 2 is rotating for closing, the closing part 221 pushes the first stop part 31 to rotate the lever 3 for closing, until the lever 3, through the connecting rod 54, drives the operating mechanism 5 to complete the closing action (at this point, the circuit breaker has completed the process from the open position to the closed position). Simultaneously, if... Figure 6 As shown, the moving limit part 26, which rotates together with the second incomplete gear 2, pushes the first elastic arm 41 of the return spring 4, causing the distance between the first elastic arm 41 and the second elastic arm 42 to gradually increase in order to store energy. After the tail end 232 of the first sector gear part 11 and the second sector gear part 23 separates, the return spring 4 releases energy, causing the first elastic arm 41 to push the moving limit part 26 in the opposite direction, thereby driving the second incomplete gear 2 back to its initial position. During the process of the second incomplete gear 2 returning to its initial position, the lever 3, which is already in the closed position, will not be pushed, but the opening part 222 of the second incomplete gear 2 will approach or abut against the second stop part 32 of the lever 3. At the same time, the lever 3, which is in the closed position, has simultaneously triggered the second micro switch K2 and the third micro switch K3, thereby switching the conduction state of the closing circuit and the opening circuit, that is, the closing circuit is disconnected and the opening circuit is connected. When lever 3 just touches the second micro switch K2, the closing circuit is cut off. However, due to the error in the micro switch and the closing stroke, lever 3 will trigger the second micro switch K2 before reaching the closing position. At this time, the first incomplete gear 1 or lever 3 cannot be guaranteed to be in the closed position. Therefore, it is necessary to keep the motor M rotating for a while through the auxiliary circuit. However, due to the unidirectional conduction of diode D3, the closing voltage cannot flow through the opening circuit. At this time, if the first incomplete gear 1, after being separated from the second incomplete gear 2, has not rotated to the closing position, the closing voltage can drive the motor M to continue rotating through the still conducting auxiliary circuit until the first incomplete gear 1 rotates to the closing position, so that the head end 111 of the first sector gear 11 abuts against the button of the first micro switch K1, causing the auxiliary circuit to disconnect. The motor M is thus de-energized and stops. At this time, the transmission mechanism is in the closing position (see...). Figure 3 , 14 ).

[0058] The process from the transmission mechanism being closed to the circuit breaker being open: When in the closed state (both the transmission mechanism and the circuit breaker are closed), the first end 111 of the first sector gear 11 abuts against the button of the first micro switch K1, causing the auxiliary circuit to be disconnected. The side wall of the lever 3 presses against the buttons of the second micro switch K2 and the third micro switch K3, causing the circuit breaker to be open and the circuit breaker to be closed. By applying a circuit breaker voltage with the opposite polarity to the closing voltage to the control circuit, current flows through the circuit breaker. Figure 14 , 15The current direction is from right to left. Motor M rotates with the circuit breaker open, and the transmission mechanism connected to motor M also rotates with the circuit breaker open. As the first incomplete gear 1 rotates with the circuit breaker open, the head end 111 of the first sector gear section 11 separates from the button of the first micro switch K1, thus connecting the auxiliary circuit (see...). Figure 15 The tail end 112 of the first sector gear 11 pushes the head end 231 of the second sector gear 23, which is in the initial position, to rotate open. This causes the opening part 222 of the second incomplete gear 2 to push the second stop part 32, causing the lever 3 to rotate open. During the opening rotation of the lever 3, the lever 3 separates from the buttons of the second micro switch K2 and the third micro switch K3. At this time, the opening circuit is connected and the closing circuit is disconnected. However, the opening voltage cannot flow through the closing circuit due to the unidirectional conduction of the diode D2. The opening voltage only drives the motor M to continue to rotate open through the connected auxiliary circuit, so that the lever 3 can continue to rotate open until the lever 3 drives the operating mechanism 5 to complete the opening action (at this time, the circuit breaker has completed the action process from the closing position to the opening position). At the same time, if Figure 7 As shown, the moving limit part 26, which rotates together with the second incomplete gear 2, pushes the second elastic arm 42 of the return spring 4, causing the distance between the first elastic arm 41 and the second elastic arm 42 to gradually increase in order to store energy. After the tail end 112 of the first sector gear part 11 separates from the head end 231 of the second sector gear part 23, the return spring 4 releases energy, causing the second elastic arm 42 to push the moving limit part 26 in the opposite direction, driving the second incomplete gear 2 back to its initial position. During the process of the second incomplete gear 2 returning to its initial position, the lever 3, which is already in the open position, will not be pushed, but the closing part 221 of the second incomplete gear 2 will approach or abut against the first stop part 31 of the lever 3. At the same time, after the opening rotation of the motor M drives the first incomplete gear 1 to separate from the second incomplete gear 2, the tail end 112 of the first sector gear part 11 abuts against the button of the first micro switch K1, causing the auxiliary circuit to disconnect. The motor M is thus de-energized and stops. At this time, the transmission mechanism is in the open position (see Figure 4 , 12 During this process, the conduction time of the tripping circuit is significantly shorter than that of the closing circuit.

[0059] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A circuit breaker, comprising an operating mechanism (5) and a drive module, wherein the drive module cooperates with the operating mechanism (5) to realize the automatic opening and closing of the circuit breaker, and the drive module comprises a control circuit, a motor (M) connected to the control circuit, and a transmission mechanism driven by the motor (M). The control circuit includes a parallel closing circuit and a closing circuit, wherein the closing circuit and the closing circuit are kept in a state of one being on and the other being off. A unidirectional conducting element is connected in series in each of the closing and opening circuits, and the current conduction direction of the unidirectional conducting element in the opening circuit is opposite to that in the closing circuit. When the closing circuit is on, a closing voltage is applied to the closing circuit to drive the motor (M) to perform closing rotation. When the opening circuit is on, a closing voltage with the opposite polarity to the closing voltage is applied to the opening circuit to drive the motor (M) to perform opening rotation. The characteristic feature is that: The control circuit also includes an auxiliary line connected in parallel with the closing line and the opening line. The opening and closing of the auxiliary line is controlled by a first micro switch (K1). When the transmission mechanism rotates to open or close the circuit, it triggers the first micro switch (K1) to conduct the auxiliary line. When the circuit breaker is closed or open, the transmission mechanism first triggers the switching of the conduction state of the closing line and the opening line. The auxiliary line drive motor (M) continues to rotate when it is in the conducting state. When the transmission mechanism is closed or open, it triggers the first micro switch (K1) to disconnect the auxiliary line.

2. A circuit breaker according to claim 1, characterized in that: The opening and closing of the circuit breaker are controlled by the second micro switch (K2) and the third micro switch (K3), respectively. When the circuit breaker is closed or open, the transmission mechanism simultaneously triggers the second micro switch (K2) and the third micro switch (K3) to control the opening and closing of the circuit breaker.

3. A circuit breaker according to claim 2, characterized in that: The closing and opening circuits are controlled by a set of normally closed contacts and a set of normally open contacts. The opening and closing of the normally closed contacts are controlled by a second micro switch (K2) and a third micro switch (K3), respectively. The transmission mechanism keeps the closing and opening circuits connected and disconnected by triggering the second micro switch (K2) and the third micro switch (K3).

4. A circuit breaker according to claim 3, characterized in that: The second micro switch (K2) and the third micro switch (K3) are linked together. When the circuit breaker is closed, the transmission mechanism triggers the second micro switch (K2) and the third micro switch (K3) to switch the conduction state of the closing line and the opening line.

5. A circuit breaker according to claim 4, characterized in that: When the circuit breaker is in the position from open to closed, the motor (M) is driven by the closed circuit and the auxiliary circuit to perform the closing rotation. When the circuit breaker is in the position from closed to open, the motor (M) is driven by the closed circuit to perform the opening rotation first, and then the motor (M) is driven by the closed auxiliary circuit to continue the opening rotation.

6. A circuit breaker according to claim 2, characterized in that: The transmission mechanism includes a first incomplete gear (1) and a lever (3) that are respectively linked to the motor (M) and the operating mechanism (5). The first incomplete gear (1) is used to trigger the first micro switch (K1), and the lever (3) is used to trigger the second micro switch (K2) and the third micro switch (K3). The first micro switch (K1) is fixedly disposed on one side of the first incomplete gear (1), and the second micro switch (K2) and the third micro switch (K3) are fixedly disposed between the lever (3) and the operating mechanism (5).

7. A circuit breaker according to claim 6, characterized in that: The first incomplete gear (1) includes a first sector gear section (11). When the transmission mechanism is closed, the head end (111) of the first sector gear section (11) abuts against the button of the first micro switch (K1). After the transmission mechanism is opened, the tail end (112) of the first sector gear section (11) abuts against the button of the first micro switch (K1). During the opening and closing rotation, the first sector gear section (11) separates from the button of the first micro switch (K1).

8. A circuit breaker according to claim 6, characterized in that: The lever (3) includes a fan-shaped lever body, with a shaft hole at one end and a connecting hole (34) at the other end. The connecting hole (34) is used to be linked with the connecting rod (54) of the operating mechanism (5). The second micro switch (K2) and the third micro switch (K3) are located on the side of the lever body near the connecting hole (34). When the circuit breaker is closed or opened, the second micro switch (K2) and the third micro switch (K3) are triggered simultaneously by the side wall of the lever body. When the circuit breaker is opened or closed, one end of the lever body moves away from the second micro switch (K2) and the third micro switch (K3).

9. A circuit breaker according to claim 6, characterized in that: The transmission mechanism also includes a second incomplete gear (2), which is coaxially rotated and driven by the lever (3). The second incomplete gear (2) is engaged with the first incomplete gear (1), and the first incomplete gear (1) drives the second incomplete gear (2) to perform opening and closing rotation. During the opening and closing process, the first incomplete gear (1) and the second incomplete gear (2) located in the initial position are engaged with each other, so that the second incomplete gear (2) drives the lever (3) to perform opening or closing rotation. The opening and closing rotations are in opposite directions.

10. A circuit breaker according to claim 6, characterized in that: The operating mechanism (5) includes a rotating plate (51) rotatably mounted inside the housing (6). A snap fastener (52) and a lock fastener (53) are rotatably mounted on the rotating plate (51). One end of the snap fastener (52) and the lock fastener (53) are fastened together. One end of the snap fastener (52) is connected to a connecting rod (54). The connecting rod (54) is used to be linked with the lever (3) of the transmission mechanism.

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