Permanent magnet circuit breaker emergency opening mechanism

Abstract

The application discloses an emergency opening mechanism of a permanent magnet circuit breaker, and relates to the technical field of switch devices.The emergency opening mechanism comprises a transmission shaft, which is rotatably arranged on a circuit breaker frame; a transmission assembly, which comprises a pair of transmission crank arms, a wedge-shaped crank arm and a circuit breaker crank arm; one end of each transmission crank arm is connected with the transmission shaft, and the other end of each transmission crank arm is connected with the corresponding wedge-shaped crank arm; the wedge-shaped crank arm moves under the drive of the transmission crank arm, and is provided with a variable-inclination slope, which comprises a front slope and a rear slope arranged in sequence in the opening drive direction, and the inclination angle of the front slope is greater than that of the rear slope; the circuit breaker crank arm is rotatably arranged on the circuit breaker frame through a circuit breaker crank arm rotating shaft, and is provided with a circuit breaker crank arm shaft in abutting cooperation with the variable-inclination slope; and the wedge-shaped crank arm drives the circuit breaker crank arm to rotate through the circuit breaker crank arm shaft, so as to realize the opening of the circuit breaker. The emergency opening mechanism of the permanent magnet circuit breaker can improve the reliability of the emergency opening and reduce the manual operating force.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and in particular to an emergency tripping mechanism for a permanent magnet circuit breaker. Background Technology

[0002] Permanent magnet circuit breakers use a permanent magnet operating mechanism to maintain the closed state, and have advantages such as simple structure, reliable operation, and no need for continuous power supply. When the control circuit loses power or the electrical tripping circuit fails, the circuit breaker cannot be electrically tripped normally. Therefore, an emergency tripping mechanism is usually configured to achieve forced tripping through mechanical means.

[0003] Existing emergency tripping mechanisms typically convert manual operation into circuit breaker tripping motion through inclined plane transmission, but these transmission inclined planes often employ a fixed angle. During emergency tripping, the transmission mechanism usually needs to first eliminate the backlash between transmission components before overcoming the closing holding force of the permanent magnet operating mechanism to complete the tripping. A fixed-angle inclined plane struggles to simultaneously address both the backlash elimination speed and the force amplification requirements during the force-bearing phase: a smaller angle results in a slower backlash elimination speed, affecting the emergency tripping response; a larger angle leads to insufficient force amplification, resulting in a larger manual operating force.

[0004] Therefore, how to provide an emergency tripping mechanism for permanent magnet circuit breakers that can quickly eliminate the initial idle stroke during tripping and improve the transmission force and reduce the operating force during the force-operated tripping stage is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide an emergency tripping mechanism for a permanent magnet circuit breaker, which takes into account both the rapid response in the early stage of tripping and the force increase requirement in the stress stage, thereby improving the reliability of emergency tripping and reducing manual operation force.

[0006] To achieve the above objectives, the present invention provides the following technical solution: An emergency tripping mechanism for a permanent magnet circuit breaker includes: The drive shaft extends along the three-phase arrangement direction of the circuit breaker and is rotatably mounted on the circuit breaker frame; Three sets of transmission components, each corresponding to the three-phase configuration of the circuit breaker, each set of transmission components includes a pair of transmission crank arms, a wedge-shaped crank arm and a circuit breaker crank arm; In each group of transmission components, one end of each of the two transmission crank arms is connected to the transmission shaft, and the other end is connected to the corresponding wedge-shaped crank arm. The wedge-shaped crank arm moves under the drive of the transmission crank arm and is provided with a variable tilt angle inclined surface. The variable tilt angle inclined surface includes a front inclined surface and a rear inclined surface arranged sequentially along the opening drive direction. The tilt angle of the front inclined surface is greater than that of the rear inclined surface. The circuit breaker crank arm is rotatably mounted on the circuit breaker frame via a circuit breaker crank arm rotation shaft, and is provided with a circuit breaker crank arm shaft that abuts against the variable tilt angle inclined surface. The wedge-shaped crank arm drives the circuit breaker crank arm to rotate via the circuit breaker crank arm shaft to achieve circuit breaker tripping.

[0007] Preferably, the end of the wedge-shaped crank arm away from the transmission crank arm is connected to a support shaft, and the portion of the support shaft located on both sides of the wedge-shaped crank arm is respectively provided with rollers.

[0008] Preferably, limiting members are provided at both ends of the support shaft.

[0009] Preferably, the front inclined surface and the rear inclined surface are continuously and smoothly transitioned, the inclination angle of the front inclined surface is 20 degrees, and the inclination angle of the rear inclined surface is 15 degrees.

[0010] Preferably, when the circuit breaker is closed, a safe clearance is maintained between the variable-angle inclined surface of the wedge-shaped crank arm and the crank arm shaft of the circuit breaker.

[0011] Preferably, the circuit breaker crank arm includes two arm plates arranged opposite each other, and a connector for connecting the two arm plates is provided between the two arm plates.

[0012] Preferably, the circuit breaker also includes a spring, one end of which is connected to the circuit breaker frame and the other end of which is connected to the connector.

[0013] Preferably, the circuit breaker frame includes a base plate and a plurality of support plates and a plurality of upright plates disposed on the base plate. The plurality of support plates are respectively disposed corresponding to the three sets of transmission components. The circuit breaker crank arm rotation shaft is rotatably disposed on the corresponding support plate, and the transmission shaft is rotatably supported on the upright plate.

[0014] Preferably, the drive shaft is rotatably mounted on the upright plate via bearings, and the shaft segment in which the drive shaft and the drive crank arm are connected is a prismatic segment.

[0015] Preferably, one end of the drive shaft is provided with an emergency tripping operation hole for manual operation.

[0016] Compared with the above-mentioned background technology, the emergency tripping mechanism of the permanent magnet circuit breaker provided by the present invention has the following beneficial effects: By setting a front inclined surface and a rear inclined surface on the wedge-shaped crank arm, and making the inclination angle of the front inclined surface greater than that of the rear inclined surface, the backlash can be quickly eliminated in the initial stage of tripping, thus improving the response speed. After entering the force-bearing stage, the force-boosting effect is improved by using the rear inclined surface with a smaller inclination angle, reducing the manual operation force, thereby balancing fast response and labor-saving tripping.

[0017] Meanwhile, this application sets up three sets of transmission components for each of the three phases of the circuit breaker, which are synchronously driven by the same transmission shaft, which helps to improve the consistency and synchronicity of the three-phase tripping action.

[0018] In addition, by forming a mechanical transmission path through the drive shaft, drive crank arm, wedge crank arm and circuit breaker crank arm, emergency mechanical tripping can be achieved when electric tripping fails, thereby improving the emergency tripping reliability of permanent magnet circuit breakers. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0020] Figure 1 A schematic diagram of the axial structure of the emergency tripping mechanism of a permanent magnet circuit breaker provided in an embodiment of the present invention; Figure 2 A front structural schematic diagram of the emergency tripping mechanism of a permanent magnet circuit breaker provided in an embodiment of the present invention; Figure 3 A side sectional view of the emergency tripping mechanism of a permanent magnet circuit breaker provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the single-phase transmission assembly in the emergency tripping mechanism of a permanent magnet circuit breaker provided in an embodiment of the present invention; Figure 5 for Figure 4 A magnified view of a portion of the image; Figure 6 This is a schematic diagram of the structure of the wedge-shaped crank arm and the transmission crank arm provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the wedge-shaped crank arm and the circuit breaker crank arm shaft provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the wedge-shaped crank arm and the circuit breaker crank arm provided in an embodiment of the present invention.

[0021] Figure label: 1-Drive shaft; 2-Wedge-shaped crank arm; 3-Drive crank arm; 4-Circuit breaker crank arm shaft; 5-Circuit breaker crank arm; 6-Circuit breaker crank arm rotating shaft; 7-Circuit breaker frame; 71-Base plate; 72-Support plate; 73-Upright plate; 8-Support shaft; 9-Roller; 10-Limiting component; 11-Spring; 12-Emergency tripping operation hole. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] This invention provides an emergency tripping mechanism for permanent magnet circuit breakers. Applicable to 12kV to 40.5kV phase-selective control permanent magnet vacuum circuit breakers, when the control circuit of the permanent magnet operating mechanism fails to operate electrically, or the secondary circuit is disconnected, the control board is damaged, or the excitation coil itself malfunctions, preventing the circuit breaker from tripping, it can reliably achieve three-phase synchronous emergency tripping manually using a purely mechanical method. This ensures that even with a complete failure of the electrical control system, fault current can still be interrupted, guaranteeing the tripping reliability and operational safety of the power system.

[0024] See Figures 1 to 8 This paper provides a detailed description of the overall structure of the emergency tripping mechanism of a permanent magnet circuit breaker and its emergency tripping operation process.

[0025] The emergency tripping mechanism of the permanent magnet circuit breaker provided in this embodiment includes a drive shaft 1, a transmission assembly, and a circuit breaker frame 7. The drive shaft 1 extends along the direction of the three-phase arrangement of the circuit breaker and is rotatably mounted on the circuit breaker frame 7; the drive shaft 1 is arranged through the three-phase length direction, with one end extending out of the circuit breaker frame 7 for insertion of a manual operating lever to apply torque. The transmission assembly has three sets corresponding to the three phases of the circuit breaker, and the three sets of transmission assemblies are arranged at intervals along the axial direction of the drive shaft 1, and are all synchronously driven by the drive shaft 1 to ensure that the tripping action of the three phases is highly consistent. Each set of transmission assemblies includes a pair of transmission crank arms 3, a wedge-shaped crank arm 2, and a circuit breaker crank arm 5.

[0026] The transmission crank arms 3 are arranged in pairs, with each pair located on both sides of the wedge-shaped crank arm 2. One end of each transmission crank arm 3 is connected to the transmission shaft 1, and the other end is hinged to the corresponding wedge-shaped crank arm 2. When the transmission shaft 1 rotates, the paired transmission crank arms 3 swing synchronously with the transmission shaft 1, converting the rotational motion of the transmission shaft 1 into a push on the wedge-shaped crank arm 2, thus forming the first-stage crank-connecting rod type force amplification transmission. Because the pair of transmission crank arms 3 symmetrically clamps the wedge-shaped crank arm 2, the wedge-shaped crank arm 2 experiences balanced force on both sides during transmission, resulting in smooth movement and reducing the likelihood of skewness or jamming, thereby improving transmission reliability.

[0027] The wedge-shaped crank arm 2 reciprocates under the drive of a pair of transmission crank arms 3. The wedge-shaped crank arm 2 is equipped with a variable-angle inclined surface, which includes a front inclined surface and a rear inclined surface arranged sequentially along the brake opening drive direction. The inclination angle of the front inclined surface is greater than that of the rear inclined surface. The front and rear inclined surfaces transition smoothly and continuously, with no sharp angles or stress concentrations between them. Therefore, the wedge-shaped crank arm 2 can form a thrust characteristic during its stroke, first quickly eliminating idle travel and then amplifying the output thrust, thus constituting a second-stage force amplification structure. The first-stage crank-connecting rod force amplification and the second-stage variable-angle inclined surface force amplification are coupled in series, significantly improving the overall force amplification ratio of the entire mechanism.

[0028] The circuit breaker crank arm 5 is rotatably mounted on the circuit breaker frame 7 via the circuit breaker crank arm rotating shaft 6. The middle part of the circuit breaker crank arm 5 is rotatably connected to the circuit breaker crank arm rotating shaft 6, thus forming a lever structure with the circuit breaker crank arm rotating shaft 6 as the fulcrum. One end of the circuit breaker crank arm 5 is provided with a circuit breaker crank arm shaft 4 that abuts against the variable tilt angle inclined surface, and the other end is connected to the moving end transmission component of the circuit breaker fixed-seal pole. The wedge-shaped crank arm 2 pushes against the circuit breaker crank arm shaft 4 through the variable tilt angle inclined surface, thereby driving the circuit breaker crank arm 5 to rotate around the circuit breaker crank arm rotating shaft 6. The rotation of the circuit breaker crank arm 5 drives the moving end of the circuit breaker fixed-seal pole to move in the opening direction, overcoming the closing holding attraction of the permanent magnet operating mechanism, thereby completing the mechanical opening of the circuit breaker. The circuit breaker crank arm shaft 4 is cylindrical, and it has a rolling contact with the variable tilt angle inclined surface and can roll on the inclined surface, further reducing the frictional resistance during the transmission process.

[0029] The specific working process of emergency tripping is as follows: When the circuit breaker is normally in the closed state, the wedge-shaped crank arm 2 is in the backward limit position, and a certain gap is maintained between the variable tilt angle inclined surface and the circuit breaker crank arm shaft 4. The manual tripping transmission chain does not participate in the electric tripping and closing movement of the circuit breaker. When the control circuit of the permanent magnet operating mechanism is de-energized or the electrical control malfunctions, causing the electric tripping to fail, insert the manual operating lever into the operating hole of the drive shaft 1 and rotate the drive shaft 1 counterclockwise. The drive shaft 1 synchronously drives the three-phase drive crank arms 3 to swing, and the drive crank arms 3 push the three sets of wedge-shaped crank arms 2 to move forward synchronously in the tripping drive direction. The variable-angle inclined surface of the wedge-shaped crank arms 2 pushes the circuit breaker crank arm shaft 4. The circuit breaker crank arm shaft 4 first moves along the front inclined surface with a larger inclination angle, quickly eliminating the safety backlash of the mechanism with a smaller handle rotation angle, and then moves along the rear inclined surface with a smaller inclination angle. The inclined surface force ratio is greatly improved, so that the strong closing suction of the permanent magnet operating mechanism can be overcome with a smaller manual torque. The circuit breaker crank arm 5 rotates around the circuit breaker crank arm rotation shaft 6 under the push of the circuit breaker crank arm shaft 4, driving the moving ends of the three-phase solid-sealed poles to move synchronously in the tripping direction, completing the three-phase synchronous tripping. After the operation is completed, release the manual operating lever. The tripping reset force of the permanent magnet operating mechanism pushes the wedge-shaped crank arm 2 back to its initial position, and the mechanism returns to the state of waiting for the next emergency operation.

[0030] Because each of the three phases is equipped with an independent transmission assembly and is synchronously driven by the same rigid transmission shaft 1, the tripping torque of the three phases is transmitted independently, without relying on the torsional deformation of the transmission shaft for force transmission. This effectively suppresses the synchronization error caused by the torsion of the transmission shaft, ensuring high synchronization of the three-phase tripping action and meeting the requirements of phase-selective control circuit breakers. At the same time, the series cooperation between the first-stage crank connecting rod force amplification and the second-stage variable-angle inclined plane force amplification reduces the manual operation torque compared to the traditional screw rod plus arc-shaped crank arm scheme. Ordinary maintenance personnel can easily complete the emergency tripping operation with one hand, fundamentally solving the technical contradiction that the traditional single-stage fixed-angle inclined plane cannot balance the idle travel elimination speed and the end output thrust.

[0031] Based on the above embodiments, see Figure 4 , Figure 5 and Figure 6 The end of the wedge-shaped crank arm 2 furthest from the transmission crank arm 3 is connected to a support shaft 8. Rollers 9 are respectively installed on the portions of the support shaft 8 located on both sides of the wedge-shaped crank arm 2. That is, a support shaft 8 is fixedly or hinged to one end of the wedge-shaped crank arm 2. The support shaft 8 extends in a direction perpendicular to the direction of movement of the wedge-shaped crank arm 2, and a roller 9 is fitted on each of its extended sections on both sides of the wedge-shaped crank arm 2. The two rollers 9 are symmetrically distributed on both sides of the wedge-shaped crank arm 2. A guide surface or guide rail extending in the direction of tripping drive is provided on the circuit breaker frame 7 corresponding to the positions of the rollers 9. The two rollers 9 are supported and rolled on the guide surface, thus providing support and guidance for the movement of the wedge-shaped crank arm 2.

[0032] When the wedge-shaped crank arm 2 reciprocates under the push of a pair of transmission crank arms 3, the two rollers 9 at one end roll purely along the guide surface, transforming the sliding friction between the wedge-shaped component and the guide rail in the traditional scheme into rolling friction, significantly reducing frictional resistance. Simultaneously, a floating fit with a slight clearance can be used between the support shaft 8 and the wedge-shaped crank arm 2, and between the rollers 9 and the support shaft 8, allowing the wedge-shaped crank arm 2 to generate a slight adaptive float perpendicular to the feed direction, automatically matching the contact position of the circuit breaker crank arm shaft 4, thereby completely eliminating transmission dead points. Furthermore, self-lubricating bushings can be press-fitted between the inner hole of the rollers 9 and the support shaft 8, as well as at each hinge point, further reducing friction and wear. Through the pure rolling support of the rollers 9, the operating force of the mechanism is stable and fluctuates minimally throughout the entire operating stroke. Even in extreme conditions such as contact welding, there will be no jamming preventing tripping, thus significantly improving the safety redundancy of tripping under power grid fault conditions.

[0033] Based on the above embodiments, the structure of the limiting member 10 will be further described, see [link to documentation]. Figure 4 and Figure 5 .

[0034] Limiting elements 10 are provided at both ends of the support shaft 8. The limiting element 10 can be a limiting block integrally formed with the support shaft 8 or fixedly connected to it. On the one hand, it axially positions the roller 9 mounted on the support shaft 8 to prevent the roller 9 from moving axially along the support shaft 8 and disengaging from the guide surface; on the other hand, the limiting element 10 can cooperate with the corresponding stopping part on the circuit breaker frame 7 to limit the limit feed stroke of the wedge-shaped crank arm 2, preventing the wedge-shaped crank arm 2 from overtraveling and causing damage to the mechanism when the manual operation torque is too large.

[0035] Specifically, when the manual torque applied by the maintenance personnel exceeds the torque required for normal tripping, the wedge-shaped crank arm 2 moves forward and is stopped when the limit piece 10 abuts against the stop part of the circuit breaker frame 7, thereby preventing the transmission crank arm 3, wedge-shaped crank arm 2, circuit breaker crank arm shaft 4 and circuit breaker crank arm 5 from plastic deformation or even breakage due to excessive force.

[0036] Based on the above embodiments, the specific inclination angle and transition form of the variable inclination slope are further explained, see [link to relevant documentation]. Figure 3 and Figure 6 .

[0037] The front and rear inclined planes transition smoothly and continuously. The inclination angle of the front inclined plane is 20 degrees, and that of the rear inclined plane is 15 degrees. The front inclined plane is a steep slope with a larger inclination angle, while the rear inclined plane is a gentle slope with a smaller inclination angle. The two are connected by a smooth transition surface, without any bends or stress concentrations, thus ensuring that the circuit breaker crank arm shaft 4 experiences continuous force and moves smoothly during the transition between the two inclined planes.

[0038] During emergency tripping, the circuit breaker crank arm shaft 4 first contacts the 20-degree steep slope at the front. Due to the large inclination angle of the front slope, the lifting amount of the circuit breaker crank arm shaft 4 corresponding to each forward movement of the wedge-shaped crank arm 2 is large. Therefore, only a small handle rotation angle is needed to quickly eliminate the safety clearance reserved in the closing state of the mechanism, allowing the mechanism to quickly enter the force-bearing tripping stage and improve the emergency response speed under power failure. Subsequently, the circuit breaker crank arm shaft 4 rolls to the 15-degree gentle slope at the rear. Due to the smaller inclination angle of the rear slope, the force amplification ratio of the slope is greatly increased. The wedge-shaped crank arm 2 can apply a large lifting thrust to the circuit breaker crank arm shaft 4 with a small pushing force, thereby overcoming the strong closing attraction of the permanent magnet operating mechanism with a small manual torque. The combination of the 20-degree and 15-degree inclination angles allows the variable-angle slope to simultaneously eliminate the clearance quickly in the front and provide a large thrust output in the rear. Combined with the force amplification of the first-stage crank connecting rod, the overall force amplification of the mechanism is increased.

[0039] Based on the above embodiments, the safety clearance and normal decoupling structure in the closed state of the circuit breaker are further explained. See [link / reference]. Figure 2 .

[0040] When the circuit breaker is closed, a safe clearance is maintained between the variable-angle inclined surface of the wedge-shaped crank arm 2 and the crank arm shaft 4 of the circuit breaker. That is to say, when the circuit breaker is operating normally in closed mode, the wedge-shaped crank arm 2 is in the retracted limit position, and its variable-angle inclined surface does not contact the crank arm shaft 4 of the circuit breaker, with a safe clearance of about 2 mm to 3 mm reserved between them.

[0041] Due to the existence of this safety clearance, the entire manual tripping transmission chain, consisting of the drive shaft 1, drive crank arm 3, wedge-shaped crank arm 2, and roller 9, is completely physically separated from the permanent magnet operating mechanism during the normal electric tripping and closing of the circuit breaker. It does not participate in the electric tripping and closing motion and does not generate any additional transmission resistance or frictional loss to the electric tripping and closing of the circuit breaker. Compared to the structure in the comparative technology where the arc-shaped crank arm is always in contact with the screw rod in the closed state and there is continuous sliding frictional loss during electric operation, the normal decoupling structure of this embodiment avoids additional wear under electric operating conditions and does not accelerate the wear of internal parts such as the iron core and coil of the permanent magnet operating mechanism, thereby extending the electrical life of the entire circuit breaker. Furthermore, the safety clearance also provides a travel basis for the rapid elimination of the backlash on the steep slope at the front during emergency tripping, ensuring the mechanism's rapid response capability under emergency conditions.

[0042] Based on the above embodiments, the specific structure of the circuit breaker crank arm 5 will be further described, see [link to documentation]. Figure 7 and Figure 8 .

[0043] The circuit breaker crank arm 5 includes two opposing arm plates, with a connector between them. The two arm plates are parallel and spaced apart. The circuit breaker crank arm rotation shaft 6 passes through the middle of both arm plates, allowing them to rotate synchronously around the shaft. The two ends of the circuit breaker crank arm shaft 4 are supported on the two arm plates, so that the two arm plates symmetrically bear the thrust from the variable-angle inclined plane on the circuit breaker crank arm shaft 4.

[0044] The structure employing two opposing arm plates connected by a connector serves two purposes: firstly, it creates a high-rigidity frame structure for the circuit breaker crank arm 5, enabling it to withstand the large tripping force during emergency tripping without easily deforming; secondly, it ensures balanced force distribution on both ends of the circuit breaker crank arm shaft 4, avoiding the uneven loading and torsion caused by unilateral force on a single-plate structure, thus guaranteeing smooth rotation and reliable tripping operation of the circuit breaker crank arm 5. The connector not only connects and fixes the two arm plates, ensuring their relative positions, but also serves as a connection base for other components, facilitating the overall assembly of the mechanism and the installation of subsequent parts.

[0045] Based on the above embodiments, the arrangement of spring 11 will be further explained, see [link to relevant documentation]. Figure 1 , Figure 2 and Figure 5 .

[0046] One end of the spring 11 is connected to the circuit breaker frame 7, and the other end is connected to the connecting piece. That is, the spring 11 is connected between the circuit breaker frame 7 and the connecting piece of the circuit breaker crank arm 5, thereby applying a certain elastic force to the circuit breaker crank arm 5.

[0047] The main function of spring 11 is to provide reset and holding force for the mechanism. After the emergency tripping operation is completed and the maintenance personnel release the manual operating lever, spring 11, in conjunction with the tripping reset force of the permanent magnet operating mechanism, reliably pushes the circuit breaker crank arm 5 and its linked wedge crank arm 2, transmission crank arm 3, and other components back to their initial positions. This allows a new safe clearance to be formed between the variable tilt angle inclined surface and the circuit breaker crank arm shaft 4, preparing for the next emergency tripping operation and improving the reset reliability of the mechanism. Simultaneously, under normal circuit breaker operation, spring 11 can also apply a certain holding force to the circuit breaker crank arm 5, maintaining a stable relative position between the circuit breaker crank arm shaft 4 and the wedge crank arm 2. This prevents accidental displacement of the circuit breaker crank arm 5 due to vibration or other factors, further improving the stability and reliability of the mechanism. Because spring 11 is connected to the circuit breaker crank arm 5 through a connector, the force of spring 11 can be applied relatively evenly to the two arm plates of the circuit breaker crank arm 5, avoiding uneven loading.

[0048] Based on the above embodiments, the specific structure of the circuit breaker frame 7 will be further described, see [link to documentation]. Figure 1 and Figure 2 .

[0049] The circuit breaker frame 7 includes a base plate 71 and multiple support plates 72 and multiple upright plates 73 disposed on the base plate 71. The multiple support plates 72 are respectively disposed corresponding to three sets of transmission components, that is, a corresponding support plate 72 is provided for each phase transmission component. The circuit breaker crank arm rotating shaft 6 is rotatably disposed on the corresponding support plate 72, thereby supporting the circuit breaker crank arm 5 of each phase on the corresponding support plate 72; the transmission shaft 1 is rotatably supported on the upright plate 73, and the multiple upright plates 73 provide multi-point support for the transmission shaft 1 along the length direction of the transmission shaft 1.

[0050] The frame structure, consisting of a base plate 71, a support plate 72, and upright plates 73, allows for modular assembly of components such as the drive shaft 1 and transmission assemblies onto the same base plate 71. Each phase transmission assembly is installed relatively independently using the support plate 72 as a unit, simplifying the assembly process and facilitating adjustments. Furthermore, multiple upright plates 73 provide multi-point support for the three-phase drive shaft 1, effectively reducing its deflection during the transmission of tripping torque and ensuring the rigidity and synchronization of the three-phase drive. The entire mechanism can be mounted on the circuit breaker body or switchgear frame via the base plate 71, offering strong versatility and adaptability to 12kV and even 40.5kV series permanent magnet vacuum circuit breakers. It has a wide range of operating conditions and requires no additional electrical commissioning, thus improving production line assembly efficiency and reducing manufacturing and assembly costs.

[0051] Based on the above embodiments, the installation method of the drive shaft 1 and its cooperation structure with the drive crank arm 3 are further explained. See [link to documentation]. Figure 2 and Figure 4 .

[0052] The drive shaft 1 is rotatably mounted on the vertical plate 73 via bearings, and the shaft segment connecting the drive shaft 1 and the drive crank arm 3 is a prismatic segment. That is to say, the drive shaft 1 achieves smooth rotation relative to the circuit breaker frame 7 with the help of the bearings set on the vertical plate 73. The bearings not only bear the radial load of the drive shaft 1, but also reduce the frictional resistance when the drive shaft 1 rotates, making manual operation more effortless and smoother. The shaft segment on the drive shaft 1 that mates with the drive crank arm 3 is a prismatic segment, such as a regular hexagonal prism segment or other polyprismatic segment. One end of the drive crank arm 3 is provided with a prismatic hole that mates with the prismatic segment, and the two are mated with each other by prismatic surfaces.

[0053] The connection method using prism segments and prism holes ensures reliable torque transmission between the drive shaft 1 and the drive crank arm 3 in the circumferential direction without relative rotational slippage. This guarantees that the three-phase drive crank arms 3 can swing synchronously and at the same angle when the drive shaft 1 rotates, thus ensuring the consistency of the three sets of transmission components and high-precision synchronous three-phase tripping. Simultaneously, the prism fit facilitates axial positioning and quick assembly / disassembly of the drive crank arm 3 on the drive shaft 1, which is beneficial for the assembly and maintenance of the mechanism. The drive shaft 1 adopts a continuous rigid shaft structure spanning all three phases. Combined with multi-point bearing support on the vertical plate 73 and torque transmission via the prism segments, the three-phase tripping torque is rigidly and synchronously distributed to each phase by the drive shaft 1, rather than relying on the torsional deformation of the drive shaft itself for force transmission, further ensuring the accuracy of three-phase synchronous tripping.

[0054] Based on the above embodiments, the manual operation structure of the drive shaft 1 will be further described, see [link to documentation]. Figure 1 .

[0055] One end of the drive shaft 1 is provided with an emergency tripping operation hole 12 for manual operation. The emergency tripping operation hole 12 can be set as an internal hexagonal hole or other non-circular irregular hole, which is located at the end of the drive shaft 1 that extends out of the circuit breaker frame 7, so that when the electric tripping of the circuit breaker fails, the operation and maintenance personnel can insert the corresponding manual operating rod into the emergency tripping operation hole 12 and apply torque.

[0056] By providing an emergency tripping operation hole 12 at the end of the drive shaft 1, the emergency tripping operation position is brought to an easily accessible location. The operator simply inserts the manual operating lever into the emergency tripping operation hole 12 and rotates it counterclockwise. Through the transmission of the drive shaft 1, drive crank arm 3, wedge-shaped crank arm 2, and circuit breaker crank arm 5, three-phase synchronous emergency tripping is achieved. Compared to the fixed and high position of the operating hole in the comparative technology, which requires considerable effort to operate, the emergency tripping operation hole 12 in this embodiment, combined with the aforementioned two-stage force amplification and floating roller transmission structure, significantly reduces the operating torque of manual emergency tripping and ensures a smooth operating stroke. Ordinary maintenance personnel can easily and reliably complete the emergency tripping operation with one hand. Furthermore, the emergency tripping operation hole 12 adopts an irregular hole structure, ensuring reliable torque transmission between the manual operating lever and the drive shaft 1, preventing slippage, and improving operational reliability and safety.

[0057] It should be noted that in this specification, relational terms such as first and second are used only to distinguish one entity from several other entities, and do not necessarily require or imply any such actual relationship or order between these entities.

[0058] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An emergency tripping mechanism for a permanent magnet circuit breaker, characterized in that, include: The drive shaft (1) extends along the three-phase arrangement direction of the circuit breaker and is rotatably mounted on the circuit breaker frame (7). Three sets of transmission components, each corresponding to the three-phase configuration of the circuit breaker, each set of transmission components includes a pair of transmission crank arms (3), a wedge crank arm (2) and a circuit breaker crank arm (5). One end of each of the two transmission cranks (3) in each transmission assembly is connected to the transmission shaft (1), and the other end is connected to the corresponding wedge-shaped crank (2). The wedge-shaped crank arm (2) moves under the drive of the transmission crank arm (3) and is provided with a variable tilt angle inclined surface. The variable tilt angle inclined surface includes a front inclined surface and a rear inclined surface arranged sequentially along the opening drive direction. The tilt angle of the front inclined surface is greater than that of the rear inclined surface. The circuit breaker crank arm (5) is rotatably mounted on the circuit breaker frame (7) via the circuit breaker crank arm rotation shaft (6), and is provided with a circuit breaker crank arm shaft (4) that abuts against the variable tilt angle inclined surface. The wedge-shaped crank arm (2) drives the circuit breaker crank arm (5) to rotate via the circuit breaker crank arm shaft (4) to realize the circuit breaker tripping.

2. The emergency tripping mechanism of the permanent magnet circuit breaker according to claim 1, characterized in that, The wedge-shaped crank arm (2) is connected to a support shaft (8) at one end away from the transmission crank arm (3), and the support shaft (8) is provided with rollers (9) on both sides of the wedge-shaped crank arm (2).

3. The emergency tripping mechanism of the permanent magnet circuit breaker according to claim 2, characterized in that, The support shaft (8) is provided with limiting members (10) at both ends.

4. The emergency tripping mechanism of the permanent magnet circuit breaker according to claim 1, characterized in that, The front inclined plane and the rear inclined plane transition smoothly and continuously. The inclination angle of the front inclined plane is 20 degrees, and the inclination angle of the rear inclined plane is 15 degrees.

5. The emergency tripping mechanism of the permanent magnet circuit breaker according to claim 1, characterized in that, When the circuit breaker is closed, a safe clearance is maintained between the variable tilt angle inclined surface of the wedge-shaped crank arm (2) and the crank arm shaft (4) of the circuit breaker.

6. The emergency tripping mechanism of the permanent magnet circuit breaker according to claim 1, characterized in that, The circuit breaker crank arm (5) includes two arm plates arranged opposite to each other, and a connector for connecting the two arm plates is provided between the two arm plates.

7. The emergency tripping mechanism of the permanent magnet circuit breaker according to claim 6, characterized in that, It also includes a spring (11), one end of which is connected to the circuit breaker frame (7) and the other end is connected to the connector.

8. The emergency tripping mechanism of the permanent magnet circuit breaker according to claim 1, characterized in that, The circuit breaker frame (7) includes a base plate (71) and multiple support plates (72) and multiple upright plates (73) disposed on the base plate (71). The multiple support plates (72) are respectively disposed corresponding to the three sets of transmission components. The circuit breaker crank arm rotating shaft (6) is rotatably disposed on the corresponding support plate (72), and the transmission shaft (1) is rotatably supported on the upright plate (73).

9. The emergency tripping mechanism of the permanent magnet circuit breaker according to claim 8, characterized in that, The drive shaft (1) is rotatably mounted on the vertical plate (73) via a bearing, and the shaft segment in which the drive shaft (1) and the drive crank arm (3) are connected is a prism segment.

10. The emergency tripping mechanism of the permanent magnet circuit breaker according to claim 1, characterized in that, One end of the drive shaft (1) is provided with an emergency tripping operation hole (12) for manual operation.

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