Circuit breaker

Abstract

The utility model relates to a handcart type switching device for power supply or distribution, in particular to a circuit breaker. The circuit breaker comprises a fixed base, a mechanism box and a three-phase solid-sealed polar pole are arranged on the fixed base, an opening and closing mechanism for driving the three-phase solid-sealed polar pole to conduct opening and closing is arranged in the mechanism box, and the opening and closing mechanism comprises an electromagnetic mechanism and a permanent magnet maintaining mechanism which are integrated in the mechanism box and used for driving the closing action. An output shaft is arranged on a movable iron core of the electromagnetic mechanism, the permanent magnet holding mechanism and the repulsive force mechanism both act on the output shaft, so that each stage in the opening and closing process can be rapidly completed, the repulsive force mechanism is high in response speed, needed repulsive force can be rapidly generated, and the reliability of the opening and closing operation is improved. The permanent magnet holding force is overcome, rapid opening is realized, the opening time is shortened, and the opening speed is obviously improved.

Description

Technical Field

[0001] The utility model relates to a switching device for power supply or power distribution of trolley type, in particular to a circuit breaker. Background Art

[0002] As a crucial switching device in the power system, the performance of a circuit breaker directly affects the stability and safety of the power grid. The three-phase solid-sealed pole column, as the core component of the circuit breaker, is responsible for carrying and cutting off the current in the power grid. Since there is a phase angle difference of 120 degrees between the three-phase solid-sealed pole columns, in order to realize the step-by-step closing and opening operations to ensure the stable operation of the power grid, in the prior art, an independent closing and opening mechanism is equipped for each pole column. For example, the Chinese utility model patent with the authorization announcement number CN204303669U discloses a phase-controlled permanent magnet vacuum circuit breaker, in which the closing and opening actions of the A, B, and C phases are respectively driven by three independently arranged permanent magnet mechanisms. A closing capacitor and a tripping capacitor are connected to the permanent magnet mechanism. Among them, the closing capacitor provides a single-phase closing power supply, and the tripping capacitor provides a single-phase tripping power supply. The three permanent magnet mechanisms are arranged in sequence, and the distance between adjacent permanent magnet mechanisms is the same as the distance between adjacent solid-sealed pole columns; the solid-sealed pole column and the permanent magnet mechanism are connected through a transmission crank arm, and a manual tripping mechanism is arranged on the upper part of the permanent magnet mechanism. The closing and opening actions of the A, B, and C phases are respectively driven by three independent permanent magnet mechanisms, without interference, so as to realize the zero-crossing closing and opening actions of the three phases.

[0003] The permanent magnet mechanism configured in the above-mentioned phase-controlled permanent magnet vacuum circuit breaker has good holding characteristics in the closing and opening positions, but the response speed is relatively slow, especially in the case of rapid tripping, the response time is slow and the tripping time is long, which is not conducive to the rapid cutting off of faults. Especially in the face of faults such as short circuit and overload, if the fault point cannot be quickly and effectively isolated, it will endanger the safety of power equipment and personnel. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a circuit breaker to solve the problem that the tripping speed of the circuit breaker in the prior art is slow when driving the closing and opening actions of the three-phase pole columns, and the fault cannot be quickly isolated.

[0005] To achieve the above purpose, the technical solution of the circuit breaker provided by the utility model is: the circuit breaker includes a fixed base, on which an institutional box and three-phase solid-sealed pole columns are arranged. An opening and closing mechanism for driving the three-phase solid-sealed pole columns to perform opening and closing is arranged in the institutional box. The opening and closing mechanism includes an electromagnetic mechanism for driving the closing action, a permanent magnet holding mechanism, and a repulsive force mechanism for driving the tripping action, which are integrated in the institutional box. An output shaft is arranged on the moving iron core of the electromagnetic mechanism, and both the permanent magnet holding mechanism and the repulsive force mechanism act on the output shaft.

[0006] As a further improvement, a seesaw-shaped swing output plate is provided at the bottom of the mechanism box. One end of the swing output plate is pushed by the output shaft during the movement of the moving iron core, so that the other end of the swing output plate drives the insulating pull rod connected thereto to perform opening and closing operations.

[0007] As a further improvement, the output shaft and the swing output plate are connected by a non-sticking groove and a sliding pin respectively provided on the two.

[0008] As a further improvement, the output shaft has an adjustment section, and the adjustment section is an adjustment screw provided on the output shaft.

[0009] As a further improvement, the opening and closing mechanism further includes a closing holding spring provided in the mechanism box and cooperating with the repulsive mechanism to perform the opening action.

[0010] As a further improvement, the closing holding spring is a tension spring. A spring hanging plate is fixed in the mechanism box. The two ends of the tension spring are respectively connected to the spring hanging plate and the end of the swing output plate far from the three-phase solid-sealed pole column.

[0011] As a further improvement, the electromagnetic mechanism, the permanent magnet holding mechanism and the repulsive mechanism are arranged in the mechanism box from top to bottom in sequence and integrated into one body in the mechanism box.

[0012] As a further improvement, three opening and closing mechanisms corresponding to the three-phase solid-sealed pole columns are provided in the mechanism box to independently drive the corresponding pole columns to perform opening and closing operations.

[0013] As a further improvement, the three-phase solid-sealed pole column and the mechanism box are of an integral structure.

[0014] As a further improvement, the opening and closing mechanism is further provided with a buffer mechanism. The buffer mechanism includes a seesaw-shaped buffer crank arm. The buffer crank arm is connected to the swing output plate and is on both sides of the output shaft. Opening and closing buffers are respectively provided under the swing ends on both sides of the buffer crank arm.

[0015] The beneficial effects are as follows: The present utility model provides a circuit breaker improved on the basis of the prior art. The electromagnetic mechanism, the permanent magnet holding mechanism, and the opening repulsion mechanism are integrally arranged in the circuit breaker mechanism box. During the closing process, the electromagnetic mechanism rapidly generates electromagnetic suction to drive the moving iron core to move; the permanent magnet holding mechanism provides a stable holding force to ensure the reliability of closing. Compared with the prior art, during the opening process, due to the fast response speed of the repulsion mechanism, the required repulsion can be rapidly generated to overcome the permanent magnet holding force, achieving rapid opening, which is beneficial to shortening the opening time and significantly improving the opening speed. Moreover, the permanent magnet holding mechanism and the electromagnetic mechanism together make up for the defect of the short acting distance of the repulsion mechanism, thus comprehensively ensuring rapid and reliable opening. Furthermore, when a fault such as a short circuit or overload occurs, the fault current can be rapidly cut off to protect power equipment and lines from further damage. At the same time, the three are integrated in the mechanism box, reducing the interference factors and delays during the opening and closing processes, enabling each stage during the opening and closing processes to be completed rapidly and stably, thereby significantly improving the opening and closing speeds. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 FIG. is a perspective view of an embodiment of the circuit breaker provided by the present utility model;

[0017] Figure 2 FIG. is a schematic structural view of an embodiment of the circuit breaker provided by the present utility model with the operation panel hidden;

[0018] Figure 3 FIG. is a cross-sectional view of an embodiment of the circuit breaker provided by the present utility model.

[0019] In the figures: 1, three-phase solid-sealed pole column; 2, fixed base; 3, operation panel; 4, operation button; 5, circuit breaker mechanism core; 6, opening oil buffer; 7, closing oil buffer; 8, opening and closing control switch; 9, energy storage capacitor; 10, opening and closing control switch driving unit; 11, adjusting screw; 12, tension spring; 13, swing output plate; 14, buffer crank arm; 15, hinge seat; 16, fork head; 17, sliding pin; 18, anti-sticking groove; 19, mechanism box; 20, spring hanging plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] The features and performance of the present utility model will be further described in detail below in conjunction with the embodiments.

[0021] The three-phase solid-sealed pole column is responsible for the opening and closing of the electrical main circuit. It is the core component of the circuit breaker and is responsible for cutting off the current with load in the power grid. To meet diverse application requirements, in circuit breakers with low requirements for the synchronization of opening and closing operations during opening and closing operations, a combined opening and closing operating mechanism is often provided for the entire three-phase solid-sealed pole column to simplify the control logic and reduce the operating components. In circuit breakers with higher flexibility and control accuracy requirements, an independent opening and closing operating mechanism is often configured for each phase of the solid-sealed pole column to achieve precise independent control. As the prior art cited in the background art, there is provided a circuit breaker that equips each pole column with an independent permanent magnet mechanism to drive the opening and closing actions of the three-phase pole columns respectively. However, permanent magnet mechanisms generally have problems such as slow response and slow opening speed, which to a certain extent restricts the overall performance of the circuit breaker. Therefore, there is an urgent need for a circuit breaker that can quickly open the circuit when a fault such as a short circuit or overload occurs, so as to quickly cut off the fault current, isolate the fault point, prevent the expansion of the fault range, and reduce the impact and damage to the power grid.

[0022] The overall design concept of the circuit breaker provided by the present invention is: combining different types of opening and closing operating mechanisms in the circuit breaker, and according to the characteristics of each operating mechanism, making different operating mechanisms be respectively used for the opening and closing processes, cooperating with each other, so as to maximize the advantages, and further comprehensively improve the opening and closing speed of the circuit breaker, especially significantly improving the opening speed.

[0023] Specifically, as a basic technical solution, as Figure 1 shown, the circuit breaker includes a fixed base 2, on which three-phase solid-sealed pole columns 1 and a mechanism box 19 are arranged oppositely. An opening and closing mechanism is provided in the mechanism box 19 to drive the three-phase solid-sealed pole columns to perform opening and closing operations.

[0024] The opening and closing mechanism includes an electromagnetic mechanism, a permanent magnet holding mechanism and a repulsive force mechanism integrated in the mechanism box. When closing, the electromagnetic coil in the electromagnetic mechanism is energized to generate an electromagnetic suction force for closing. The permanent magnet holding mechanism also intervenes in the work during the closing process to provide a stable holding force to ensure that the circuit breaker remains in the closed position after the electromagnetic coil is de-energized after closing, preventing accidental opening, which not only improves the stability and reliability of closing; moreover, the permanent magnet holding mechanism enables the electromagnetic mechanism to not need to be continuously energized to maintain the closed state after closing, reducing the energy consumption. When opening, the repulsive force mechanism can quickly generate a strong repulsive force to overcome the permanent magnet holding force and perform the opening operation. The repulsive force mechanism helps to reduce the opening time due to its fast opening characteristics and improve the operating speed of the circuit breaker. Compared with the prior art, the repulsive force mechanism has a fast response speed, which is conducive to further shortening the opening time and achieving fast opening.

[0025] The integrated setting of the electromagnetic mechanism, permanent magnet holding mechanism and repulsive force mechanism simplifies the internal structure of the circuit breaker, reduces the number of components and connection links, not only reduces the manufacturing cost and production difficulty, but also improves the reliability and service life of the circuit breaker; moreover, it reduces the interference factors and delays during the opening and closing processes. And the stability of the permanent magnet holding mechanism reduces the influence of external interference on the opening and closing processes, and the fast response characteristics of the electromagnetic mechanism and the opening repulsive force mechanism reduce the waiting time and delay, making the opening and closing speeds of the circuit breaker faster.

[0026] Based on the above overall introduction of the circuit breaker of the present utility model, a more specific embodiment is provided on the basis of the overall introduction as follows:

[0027] This embodiment focuses on the specific processes of the opening and closing operations of the electromagnetic mechanism, permanent magnet holding mechanism and repulsive force mechanism, and how to further improve the opening speed and elaborates in detail.

[0028] On the basis of the embodiment in which a single opening and closing mechanism is provided in the above-mentioned mechanism box 5 to drive the three-phase solid-sealed pole column 1 to perform opening and closing operations, considering that the three-phase solid-sealed pole columns 1 usually have a phase angle difference of 120 degrees, in order to avoid problems such as current imbalance or arc reignition caused by asynchronous opening and closing of the three-phase solid-sealed pole columns 1, see Figures 1 - 3 , in another more preferred embodiment, there are three sets of opening and closing mechanisms corresponding to the three-phase solid-sealed pole columns 1 in the mechanism box 19 to separately drive the corresponding pole columns to perform opening and closing actions, so as to achieve precise control of the opening and closing of each pole column, and further enable the pole columns with a phase angle difference to perform opening and closing operations simultaneously, ensuring that the opening and closing operations are carried out simultaneously when the three-phase currents all reach appropriate zero-crossing points, reducing current shocks and arc problems that may be caused by asynchronous operations, so as to protect the circuit breaker and the power system from the damage of arcs. Of course, the structure of the opening and closing mechanism is the same whether a single opening and closing mechanism is configured in the circuit breaker to drive as a whole or an opening and closing mechanism is configured for each pole column to drive separately.

[0029] As Figures 1 - 3As shown in the figure, in this embodiment, the electromagnetic mechanism is arranged above the mechanism box 5. When the electromagnetic mechanism is powered on, the electromagnetic coil generates a magnetic field, driving the moving iron core to move towards the bottom of the mechanism box 5, so that the output shaft cooperates with the insulating pull rod through the transmission mechanism to perform opening and closing operations. The electromagnetic mechanism located above is closer to the original position of the moving iron core, and the corresponding speed of the moving iron core is faster, which can reduce the magnetic circuit loss and improve the energy conversion efficiency. Moreover, the heat generated by the electromagnetic mechanism is easily dissipated through the upper part of the mechanism box 5, which is beneficial to improving the service life of the circuit breaker. The repulsive mechanism is arranged at the bottom of the mechanism box 5. After the moving iron core moves downward for closing operation, the repulsive mechanism arranged at the bottom is closer to the moving iron core, reducing the transmission distance and energy loss, which is beneficial to driving the moving iron core to move upward, thereby driving the circuit breaker contacts to separate to complete the opening operation. A permanent magnet holding mechanism is arranged between the electromagnetic mechanism and the repulsive mechanism in the mechanism box 5. The permanent magnet holding mechanism uses the magnetic force of the permanent magnet to maintain the closing or opening state of the circuit breaker. Placing it in the middle position can reduce the interference of the outside on the permanent magnet. And such an arrangement from top to bottom makes full use of the internal space of the mechanism box 5, the connection between components is tight, and the overall structure is compact.

[0030] In another more preferred embodiment, the electromagnetic mechanism, the permanent magnet holding mechanism, and the repulsive mechanism are integrated into one body. Refer to Figure 2 , and the three are integrated into the circuit breaker mechanism core 5 of one body. During the manufacturing process, the electromagnetic mechanism, the permanent magnet holding mechanism, and the repulsive mechanism are tightly connected as an inseparable whole, forming a highly integrated unit, which is beneficial to realizing the compactness of the circuit breaker volume. Furthermore, the circuit breaker can be installed in relatively narrow spaces such as distribution cabinets and control boxes, and the application range of the circuit breaker is wider. And in case of a failure, it can be quickly and conveniently replaced as a whole, which is especially suitable for application scenarios where the circuit breaker needs to respond quickly and be maintained efficiently.

[0031] Alternatively, in other embodiments, a split electromagnetic mechanism, permanent magnet holding mechanism, and repulsive mechanism can be arranged in the mechanism box. The split components are then combined by bolts. Each component can be manufactured and processed separately and then assembled. Compared with the integrated circuit breaker mechanism core, it is convenient for maintenance and replacement of damaged components. If a certain component fails, it can be replaced separately without replacing the entire opening and closing operating mechanism, thereby reducing the maintenance cost.

[0032] The electromagnetic coil in the electromagnetic mechanism is wound around or near the moving iron core. When powered on, it generates an electromagnetic field to drive the movement of the moving iron core. The bottom of the moving iron core is connected to an output shaft. A seesaw mechanism is arranged at the bottom of the mechanism box 19. The main body of the seesaw mechanism is a swing output plate 13. The swing output plate 13 is rotatably installed through a hinge seat 15 fixed to the bottom of the mechanism box 19. One end of the swing output plate 13 is located at the lower end of the vertical movement path of the output shaft. When the output shaft moves downward, the lower end of the output shaft will press against this end of the swing output plate 13, so that the swing output plate 13 can rotate around its hinge point.

[0033] During closing, the moving iron core moves downward under the action of electromagnetic force and pushes the swing output plate 13 to rotate around the hinge seat 15 through the output shaft. As the swing output plate 13 rotates, the other end of the swing output plate 13 drives the insulating pull rod fixed thereon to perform the closing operation. During the process of the output shaft pushing against the swing output plate 13, the swing output plate 13 overcomes the elastic force of the opening holding spring and continues to push the insulating pull rod to move, thereby driving the circuit breaker to complete the closing action. When the circuit breaker is successfully closed, the moving iron core is held in a stable state through the permanent magnet holding mechanism. During opening, the repulsive force mechanism overcomes the permanent magnet holding force, causing the moving iron core to move from the closing position to the opening position. The moving iron core moves upward, so that the output shaft no longer presses against the swing output plate 13, and the swing output plate 13 rotates in the reverse direction, releasing the thrust on the insulating pull rod, thereby driving the circuit breaker to complete the opening action.

[0034] In another more preferred embodiment, the bottom of the circuit breaker mechanism core 5 is connected with a tension spring 12 through a spring hanging plate 20 as the opening holding spring. The other end of the tension spring 12 is connected to the end of the swing output plate 13 far from the solid-sealed pole column. Specifically, connection holes for connecting the tension spring 12 are provided on both the spring hanging plate 20 and the swing output plate 13. During the closing process, the moving iron core moves downward under the action of electromagnetic force and pushes the swing output plate 13 to rotate through the output shaft.

[0035] During the closing process, the moving iron core moves downward under the action of electromagnetic force, pushes the output shaft and then presses against the swing output plate 13, causing it to rotate around the hinge seat 15. At this time, the tension spring 12 is stretched to store elastic potential energy. The tension of the tension spring 12 can also improve the stability of the swinging process of the swing output plate 13 to a certain extent, ensuring the smooth progress of the closing process. During opening, the repulsive force mechanism overcomes the permanent magnet holding force, causing the moving iron core to move upward, and the output shaft no longer pushes against the swing output plate 13.

[0036] During the opening process, the tension spring continuously releases the stored elastic potential energy, providing stable and continuous power for the opening action and effectively enhancing the opening speed. Even if there is a certain resistance or friction during the opening process, the tension spring can ensure sufficient opening force, enabling the circuit breaker to quickly and reliably disconnect the circuit. In addition, after the opening action is completed, although the moving iron core has moved to the opening position, the mechanism box may not have fully returned to its initial position at this time. During the energy release process of the tension spring, it not only pushes the movement of the moving iron core but also indirectly drives the reset of the entire mechanism box through components such as the output shaft. The tension of the spring gradually decreases until the mechanism box completely returns to its initial stable state, which helps the circuit breaker prepare for the next closing action and improves the reliability and safety of the entire power system.

[0037] During the movement of the moving iron core between the opening position and the closing position, the output shaft moves vertically back and forth to push the swing output plate 13 to achieve opening and closing. In this embodiment, the output shaft has an adjustment section, which is the adjustment screw 11 connected to the bottom of the output shaft. The bottom of the adjustment screw 11 is processed with threads for cooperation with the adjustment nut. By rotating the adjustment nut to adjust the length of the adjustment screw 11, the pushing position and stroke of the swing output plate 13 can be adjusted. Specifically, the change in the length of the adjustment screw 11 will directly affect the rotation angle of the swing output plate 13. Since one end of the swing output plate 13 is pushed by the adjustment screw 11, when the length of the adjustment screw 11 changes, the swing output plate 13 will be pushed by a larger or smaller angle. The opening and closing positions of the three-phase solid-sealed pole column 1 can be precisely adjusted by changing the length of the adjustment screw 11. Especially when there are three sets of opening and closing mechanisms for individual driving of the pole columns, the adjustment nuts in the opening and closing mechanisms corresponding to each pole column can be adjusted to ensure the synchronization and accuracy of three-phase opening and closing.

[0038] At the same time, during the operation of the circuit breaker, due to factors such as mechanical wear, the position of the moving contact in the arc extinguishing chamber may undergo a slight deviation. If this deviation is not compensated in a timely manner, it may cause the moving contact and the static contact to fail to align precisely during closing, thereby affecting the conductivity and reliability of the circuit breaker. At this time, the pushing degree of the swing output plate 13 on the insulating pull rod can be changed by adjusting the screw 11. When it is found that the position of the moving contact is deviated, the length of the adjustment screw 11 can be finely adjusted to correspondingly adjust the positions of the insulating pull rod and the moving contact, so as to ensure that the moving contact can be precisely aligned with the static contact during closing, enabling the circuit breaker to always maintain a good working state.

[0039] Preferably, the output shaft in the above is the adjustment screw 11 to allow fine adjustment under different installation conditions or after equipment wear to ensure the normal operation and performance of the circuit breaker. In other embodiments, the output shaft is an adjustable rigid connecting rod, which can simplify the overall structure of the circuit breaker, reduce the number of components, and lower the manufacturing cost.

[0040] The bottom of the output shaft is connected through the cooperation of the anti-sticking groove 18 and the sliding pin 17. Specifically, a fork head 16 at the bottom of the output shaft is provided with an anti-sticking groove 18, and a sliding pin 17 is fixed on the swing output plate 13. The sliding pin 17 passes through the anti-sticking groove 18 and is in sliding cooperation with the anti-sticking groove 18. The cooperation of the anti-sticking groove 18 and the sliding pin 17 enables the swing output plate 13 to swing more stably. At the same time, the width of the anti-sticking groove 18 is greater than that of the sliding pin 17, that is, the sliding pin 17 slides in the anti-sticking groove 18 and has a certain distance from the groove edge of the anti-sticking groove 18 to ensure the smooth rotation of the swing output plate 13. Of course, in other embodiments, a connecting rod can also be hinged on the swing output plate.

[0041] When the swing output plate 13 is pressed by the output shaft, the sliding pin 17 moves in the anti-sticking groove 18, reducing the instability and vibration caused by excessive rotation, making the movement of the swing output plate 13 more controllable and stable. And it is more suitable for the swing output plate 13 that itself repeats the movement during the opening and closing process, which helps to achieve more precise control, improves the overall performance and reliability of the circuit breaker, and ensures its stable operation and efficient work. Preferably, the anti-sticking groove is a waist-shaped groove or an arc-shaped groove opened on the fork head 16 at the bottom of the output shaft. Or in other embodiments, the anti-sticking groove can be opened on the swing output plate, and a sliding pin is fixed on the fork head at the bottom of the output shaft. During the rotation of the swing output plate, the fixed pin is in sliding cooperation with the anti-sticking groove.

[0042] Based on the above overall introduction of the circuit breaker of the present invention, or on the basis of the embodiments of the present invention introduced above, the following provides a more specific embodiment:

[0043] This embodiment focuses on a detailed description of the buffering process of the circuit breaker.

[0044] To reduce the impact and vibration during the opening and closing processes and improve the service life of the circuit breaker, the opening and closing mechanism is also configured with a buffering mechanism. Correspondingly, in the circuit breaker with three sets of opening and closing mechanisms corresponding to the above three-phase solid-sealed pole columns 1, three sets of buffering mechanisms are naturally configured accordingly. The buffering mechanism includes a buffering crank arm 14 arranged on the main shaft of the circuit breaker. The main shaft of the circuit breaker is segmented, and each mechanism box 5 is provided with a section of the main shaft. The buffering crank arm 14 can be connected to the swing output plate 13 through a connecting rod. The buffering crank arms are on both sides of the output shaft, and during the swinging process of the buffering crank arms, the swinging ends on both sides respectively press the opening buffer or the closing buffer. The buffering crank arm 14 and the opening and closing buffers constitute the buffering mechanism. Two opening buffers or two closing buffers can be arranged at the same swinging end on the same side of the buffering crank arm 13 to improve the buffering effect and the stability during the opening and closing processes.

[0045] During the opening and closing processes, when the swinging output plate 13 rotates, it is transmitted to the buffer toggle arm 14 through the linkage mechanism, causing the buffer toggle arm 14 to start rotating. The two ends of the buffer toggle arm 14 gradually approach and contact the opening buffer or closing buffer to absorb the energy generated during the opening and closing processes, which helps the circuit breaker to complete the opening and closing operations in a more stable state, can slow down the opening and closing speeds, make the operation process smoother, thereby reducing the mechanical stress concentration and instability phenomena caused by excessive speed, reducing the damage to the internal components of the circuit breaker due to impact and vibration, improving the stability and reliability of the operation, being beneficial to extending the service life of the circuit breaker and its components, and reducing the maintenance and replacement costs of the circuit breaker.

[0046] In this embodiment, the opening and closing buffers are the closing oil buffer 7 and the opening oil buffer 6. When one end of the buffer toggle arm 14 contacts the closing oil buffer 7 or the opening oil buffer 6. The closing oil buffer 7 and the opening oil buffer 6 are filled with oil, and the viscosity of the oil and the throttling elements in the oil circuit are used to achieve liquid damping. As the buffer toggle arm 14 continues to rotate, the closing oil buffer 7 and the opening oil buffer 6 start to absorb the impact energy generated during the opening process, slow down the rotation speed of the buffer toggle arm 14, and further slow down the movement speed of the swinging output plate 13 driving the insulating pull rod. The oil buffer can efficiently absorb the impact energy generated during the opening and closing processes by using the damping effect of the liquid. Of course, in other embodiments, the opening and closing buffers can also be spring buffers, which are simple in structure and easy to manufacture. Or gas buffers, and the damping effect of the gas buffer can be conveniently adjusted by adjusting the gas pressure or volume parameters.

[0047] Based on the above overall introduction of the circuit breaker of the present invention, or on the basis of the embodiments of the present invention introduced above, the following further provides a more specific embodiment:

[0048] This embodiment focuses on a detailed description of the specific layout inside the circuit breaker mechanism box.

[0049] See Figure 2 、 Figure 3 , the mechanism box 19 is fixed on the fixed base 2. The back of the mechanism box 19 is the operation panel 3. The operation panel 3 is provided with an opening and closing control switch 8 and operation buttons 4. The operator can send the opening signal and closing signal of the circuit breaker by operating the opening and closing control switch 8 and the operation buttons 4, and make the driving unit 10 of the opening and closing control switch act.

[0050] A storage capacitor is also provided in the circuit breaker to store energy, so as to quickly release energy to complete the opening and closing operations when needed. The charging and discharging processes of the storage capacitor are controlled by the control circuit in the secondary circuit. In this embodiment, the storage capacitor 9 is on the top of the mechanism box. More specifically, see Figure 3, the energy storage capacitor 9 is arranged on the top of the integrated circuit breaker mechanism core 5, which can make full use of the vertical space inside the circuit breaker mechanism, help reduce the overall occupied area of the circuit breaker, and make the design of the circuit breaker more compact. Moreover, the energy storage capacitor 9 is arranged on the top of the mechanism box 5, which is convenient for the operator to access the energy storage capacitor 9 more easily and perform inspections, replacements, or repairs on it without disassembling the entire circuit breaker mechanism. Maintenance and replacement are more convenient. Alternatively, in other embodiments, the energy storage capacitor can also be arranged on the side of the mechanism box.

[0051] To further reduce the volume of the circuit breaker, the three-phase solid-sealed pole column 1 and the mechanism box 19 are of an integrated structure, achieving a high degree of integration between the two and significantly reducing the volume of the circuit breaker. During the manufacturing process, the fixed part of the solid-sealed pole column is directly designed as part of the frame, or can be directly formed by injection molding or casting to integrally cure the solid-sealed pole column and the circuit breaker frame into a single component. This eliminates the gaps and redundant spaces between the various components in the circuit breakers of the prior art, thereby significantly reducing the volume of the circuit breaker, facilitating the saving of installation space, and improving the compactness of the equipment. It not only ensures the tight combination between the solid-sealed pole column and the frame, avoiding the possible gaps and looseness problems in the traditional assembly method, but also forms a firm connection structure between the solid-sealed pole column and the circuit breaker frame, enhancing the structural strength of the overall component. This is beneficial to improving the mechanical stability and anti-vibration ability of the circuit breaker and extending the service life of the equipment.

[0052] Moreover, the integrated structure forms a firm connection structure between the solid-sealed pole column and the circuit breaker frame, enhancing the structural strength of the overall component. This is beneficial to improving the mechanical stability and anti-vibration ability of the circuit breaker and extending the service life of the equipment. The integrated design reduces the number of components and connection points, reducing the probability of failures. At the same time, since all parts are tightly combined into a single component, the reliability and stability of the electrical connection are improved, ensuring the normal operation of the circuit breaker.

[0053] In other embodiments, a certain space is reserved inside the insulating housing of the circuit breaker, and the three-phase solid-sealed pole column is embedded therein. Such an arrangement can also reduce the volume and floor area of the circuit breaker. Alternatively, brackets can also be provided on the circuit breaker to mount the solid-sealed pole column. By adjusting the position and angle of the brackets, the solid-sealed pole column can be flexibly arranged to adapt to different circuit connection methods and space limitations.

[0054] It should be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present utility model does not further explain various possible combination methods.

[0055] In addition, any combination can be made among various different embodiments of the present utility model, as long as it does not violate the idea of the present utility model, and it should equally be regarded as the content disclosed by the present utility model.

[0056] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. The patent protection scope of the present utility model shall be subject to the claims. Any equivalent structural changes made by using the content of the specification and drawings of the present utility model shall equally be included in the protection scope of the present utility model.

Claims

1. A circuit breaker, comprising a fixed base, on which a mechanism box and three-phase solid-sealed poles are arranged, and in which a switching mechanism for driving the three-phase solid-sealed poles to switch on and off is arranged, characterized in that: The closing and opening mechanism includes an electromagnetic mechanism integrated in the mechanism box for driving the closing action, a permanent magnetic holding mechanism, and a repulsion mechanism for driving the opening action. An output shaft is provided on the moving iron core of the electromagnetic mechanism, and the permanent magnetic holding mechanism and the repulsion mechanism both act on the output shaft.

2. The circuit breaker according to claim 1, characterized in that: A seesaw-type swing output plate is provided at the bottom of the mechanism box. One end of the swing output plate is pushed by the output shaft during the action of the moving iron core, so that the other end of the swing output plate drives the insulating pull rod connected thereto to perform opening and closing operations.

3. The circuit breaker according to claim 2, characterized in that: The output shaft and the swing output plate are connected in cooperation with the sliding pins through anti-jamming grooves respectively arranged on the two.

4. The circuit breaker according to claim 2, characterized in that: The output shaft has an adjusting section, which is an adjusting screw arranged on the output shaft.

5. The circuit breaker according to claim 2, characterized in that: The opening and closing mechanism also includes an opening holding spring which is arranged in the mechanism box and cooperates with the repulsion mechanism to perform an opening action.

6. The circuit breaker according to claim 5, characterized in that: The opening holding spring is a tension spring, a spring hanging plate is fixed in the mechanism box, and two ends of the tension spring are respectively connected to the spring hanging plate and one end of the swing output plate three-phase away from the sealed pole.

7. The circuit breaker according to claim 1, characterized in that: The electromagnetic mechanism, the permanent magnetic holding mechanism and the repulsive mechanism are arranged in sequence from top to bottom in the mechanism box and integrated into one body in the mechanism box.

8. The circuit breaker according to any one of claims 1 to 7, characterized in that: Three groups of closing mechanisms are arranged in the mechanism box corresponding to the three-phase sealed poles to individually drive the corresponding poles to perform opening and closing actions.

9. The circuit breaker according to any one of claims 1 to 7, characterized in that: The three-phase solid-sealed pole and the mechanism box are an integrated structure.

10. The circuit breaker according to any one of claims 2 to 7, characterized in that: The opening and closing mechanism is also equipped with a buffer mechanism, which includes a seesaw-type buffer crank arm, which is connected to the swing output plate and is located on both sides of the output shaft. Opening and closing buffers are respectively arranged under the swing ends on both sides of the buffer crank arm.

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