Spring operating mechanism of vacuum circuit breaker and vacuum circuit breaker

Abstract

The invention relates to the technical field of vacuum circuit breakers, in particular to a spring operating mechanism of a vacuum circuit breaker and the vacuum circuit breaker.The spring operating mechanism comprises a rack, a transmission crank arm and an elastic speed regulation structure, one end of the elastic speed regulation structure is rotationally installed on the rack, and the other end of the elastic speed regulation structure is connected with the outer end of the transmission crank arm through a long hole; the connection between the transmission connecting lever and the elastic speed regulation structure satisfies the following conditions: at the earlier stage of the rotation stroke of the transmission connecting lever corresponding to the closing action, the outer end of the transmission connecting lever moves in the long hole, and the elastic speed regulation structure does not act on the transmission connecting lever; from the closing early stage to the just closing position, the outer end of the transmission crank arm stretches the elastic speed regulation structure and bears rotation resistance until a dead point position; and between closing and closing completion, the elastic speed regulation structure retracts and resets to provide an acting force for assisting in driving the transmission connecting lever to rotate until closing completion, so that the closing speed of the vacuum circuit breaker is regulated, and the load characteristic requirement of the vacuum circuit breaker is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum circuit breakers, and particularly relates to a spring operating mechanism of a vacuum circuit breaker and the vacuum circuit breaker. BACKGROUND

[0002] As an important control and protection device in the power system, the operating mechanism of a circuit breaker is a key component that determines the performance of the circuit breaker. The spring operating mechanism is widely used in the drive of the circuit breaker due to its simple principle, rapid opening and closing, low cost, and the ability to realize AC and DC operation.

[0003] With the rapid development of the power field, the vacuum circuit breaker has developed more rapidly due to its advantages such as arc extinguishing performance, small size, light weight, and no pollution to the environment. Unlike the SF6 circuit breaker, the load force of the vacuum circuit breaker in the no-load state is only the weight of the moving end of the circuit breaker. During the opening and closing movement of the vacuum circuit breaker, the vacuum circuit breaker is subjected to the action of the unique arc chamber self-closing force, the arc chamber bellows force, and the contact over-travel spring force, resulting in a large difference in the load characteristics compared with the SF6 circuit breaker. In the prior art, an authorized patent CN105513910B discloses a spring operating mechanism, which specifically discloses that the rack is provided with a separate opening buffer and a closing buffer, and the structure of the opening buffer and the closing buffer can be interchanged. The closing buffer includes a closing cylinder body and a closing piston rod coaxially guided and assembled with the closing cylinder body. A reset spring is sleeved on the closing piston rod. The inner end of the closing piston rod is provided with a closing piston part. The outer end is provided with a closing yoke as a rolling part. The closing yoke is provided with an assembly hole through which a rotating shaft for installing a roller bearing is arranged. Unlike the closing yoke of the closing buffer, the opening yoke of the opening buffer is provided with a hinged long hole for hinging with a transmission crank arm.

[0004] When the spring operating mechanism is closing, the closing cam rotates clockwise around its rotating shaft under the driving of the closing spring energy, and performs the closing action through the transmission of the cam crank arm. In the early and middle stages of closing, the roller bearing in the closing yoke of the closing buffer is in contact with the profile surface of the closing cam, and the roller bearing rotates around its installation shaft. The closing buffer does not work. In the late stage of closing, the closing yoke of the closing buffer moves downward under the action of the closing cam. At this time, the closing cylinder body starts to play a buffering role. Similarly, when the structure of the closing buffer and the opening buffer is interchanged, in the early stage of closing, the closing buffer does not play a buffering role due to the action of the hinged long hole. In the late stage of closing, the roller bearing is turned to the end of the hinged long hole, which drives the closing piston rod to move. The closing buffer starts to intervene and plays a buffering role to absorb the remaining energy of the closing spring, so as to avoid the early intervention of the buffer, improve the speed in the early stage of opening and closing, and effectively avoid the large impact during closing, which causes damage to the spring operating mechanism.

[0005] In the field of vacuum circuit breaker, the spring operating mechanism is subjected to a unique self-closing force during closing, and the closing speed is relatively fast. However, the over-travel spring force of the contact needs to be overcome during the over-travel segment after the moving and static contacts are contacted. When the above-mentioned closing buffer is applied to the field of vacuum circuit breaker, the closing spring buffer does not work when the closing speed of the vacuum circuit breaker should be reduced before the contacts are just contacted, and the closing speed is buffered when the closing speed should be increased after the contacts are just contacted to ensure reliable closing, so that the closing speed of the circuit breaker is reduced, and the vacuum circuit breaker cannot overcome the over-travel spring force of the vacuum circuit breaker during the over-travel segment after the moving and static contacts are contacted, resulting in a failure of the circuit breaker to close to the position, and a risk that the circuit breaker cannot perform the opening operation. Therefore, the characteristics of the spring operating mechanism in the above-mentioned technology cannot well match the characteristic requirements of the vacuum circuit breaker.

[0006] For a vacuum circuit breaker, the closing speed depends on the matching degree of the output characteristics of the spring operating mechanism and the load characteristics of the circuit breaker. Generally, the cam profile is adjusted to match the different characteristic requirements during closing, that is, the transmission efficiency of the cam is reduced before the vacuum circuit breaker is just contacted, and the transmission efficiency of the cam is increased after the vacuum circuit breaker is just contacted, so as to meet the characteristic requirements of the vacuum circuit breaker. For example, in the invention patent application with publication number CN101315849A, the cam profile is designed according to the energy conservation and the relationship between the load force and the angle of rotation of the main shaft, and the output force characteristics corresponding to the cam profile are obtained to match the load characteristics, so as to reduce the operating work of the spring operating mechanism and relieve the impact on each component. However, the cam designed in this way cannot ensure that the power characteristics accurately match the load characteristics, the profile curve needs to be repeatedly tested and corrected, the operating work of the spring operating mechanism is greatly lost, the product size is increased, the reliability is reduced, and it is not easy to implement.

[0007] In summary, with the rise of the vacuum environmentally friendly circuit breaker, new demands are put forward for the driving characteristics of the circuit breaker driving mechanism. However, the closing buffer provided in the current SF6 circuit breaker cannot match the characteristic requirements of the vacuum circuit breaker. When the cam profile of the closing cam is adjusted to match the characteristics in the vacuum circuit breaker, not only the operating work is lost, but also the degree of characteristic matching is poor, and multiple corrections are needed, which is not easy to implement. Under the trend that the vacuum circuit breaker of high voltage level replaces the SF6 circuit breaker and becomes the inevitable trend of switch technology development, the existing spring operating mechanism cannot adapt to the development needs of the current vacuum circuit breaker. SUMMARY

[0008] The spring operating mechanism of the vacuum circuit breaker aims to solve the problem that the conventional spring operating mechanism matching the opening and closing characteristics of SF6 circuit breakers cannot match the characteristic requirements of vacuum circuit breakers, and when the closing cam profile line needs to be adjusted for characteristic matching in the vacuum circuit breaker, not only the operating power loss is caused, but also the characteristic matching degree is poor, and multiple corrections are required, which is difficult to achieve.

[0009] To achieve the above-mentioned purpose, the technical scheme of the spring operating mechanism of the vacuum circuit breaker provided by the present application is: comprising a rack, a transmission crank, and an elastic speed regulation structure, one end of the elastic speed regulation structure is rotatably installed on the rack, and the other end is connected with the outer end of the transmission crank through a long hole, and the connection between the transmission crank and the elastic speed regulation structure satisfies: in the corresponding early closing action stage of the transmission crank rotation stroke, the outer end of the transmission crank moves in the long hole, and the elastic speed regulation structure does not act on the transmission crank; in the corresponding stage from the early closing stage to the just-closed position of the transmission crank rotation stroke, the outer end of the transmission crank stretches the elastic speed regulation structure and is subjected to rotational resistance until the dead point position; in the corresponding stage from the just-closed position to the completion of closing of the transmission crank rotation stroke, the elastic speed regulation structure retracts and resets to provide an auxiliary driving force for rotating the transmission crank to the completion of closing.

[0010] As a further improvement, the position of the elastic speed regulation structure in the long hole extension direction is adjustable.

[0011] As a further improvement, the elastic speed regulation structure comprises a tension spring and upper and lower connecting seats at both ends of the tension spring, the upper connecting seat is provided with the long hole, and the lower connecting seat is rotatably installed on the rack.

[0012] As a further improvement, a support shaft is rotatably installed on the rack, the support shaft is vertically fixed with an adjusting bolt, the lower connecting seat is provided with a threaded connection hole, and the adjusting bolt is connected with the lower connecting seat through the threaded connection hole.

[0013] The beneficial effect is: the present application is improved for the conventional spring operating mechanism in the existing circuit breaker, the transmission crank arm in the present application is fixedly assembled with the main rotating shaft, so that the main rotating shaft drives the transmission crank arm to rotate in the circumferential direction during the closing process of the spring operating mechanism, and the connecting position of the transmission crank arm with the elastic speed regulation structure changes along the extension direction of the long hole during the rotation of the transmission crank arm, so that in the early stage of the closing action, the outer end of the transmission crank arm moves in the long hole, the elastic speed regulation structure does not act on the transmission crank arm, and the elastic speed regulation structure is avoided to intervene in the early stage of closing; in the corresponding period of the transmission crank arm rotation stroke between the early stage of closing and the just-closed position, the outer end of the transmission crank arm stretches the elastic speed regulation structure during the rotation, and the rotation resistance is received, so as to slow down the rotation speed of the main rotating shaft to reduce the closing speed. In the corresponding period of the transmission crank arm rotation stroke between the just-closed position and the completion of closing, when the automatic static contact just contacts, it just corresponds to the dead point position of the elastic speed regulation structure, the elastic speed regulation structure is pulled over the dead point by the rotation of the transmission crank arm, the elastic speed regulation structure is retracted and reset, and the driving force for driving the transmission crank arm is provided, which promotes the dynamic and static contacts from the just-closed position to the closing over-travel position together with the closing spring.

[0014] Without changing the working condition of the spring operating mechanism closing operation, the speed of the vacuum circuit breaker before closing can be effectively reduced, the impact caused by the too fast speed of each component is avoided to affect the service life of the spring operating mechanism and the vacuum arc-extinguishing chamber, the speed of the vacuum circuit breaker after closing is improved, the resistance of the over-travel spring of the vacuum circuit breaker is overcome, the risk of the vacuum circuit breaker closing out of position, refusing to close and insufficient reliability is reduced, the inherent closing critical speed characteristics of the spring operating mechanism are greatly improved, the technical problem of matching the closing characteristics of the vacuum circuit breaker and the spring operating mechanism is solved, the output characteristics of the spring operating mechanism and the load characteristics of the vacuum circuit breaker are well matched, and then the adaptability and reliability of the vacuum circuit breaker product are significantly improved.

[0015] In order to achieve the above-mentioned purpose, the technical scheme of the vacuum circuit breaker provided by the present application is: the spring operating mechanism thereof comprises a rack, a transmission crank arm and an elastic speed regulation structure, one end of the elastic speed regulation structure is rotatably installed on the rack, the other end is connected with the outer end of the transmission crank arm through a long hole, and the connection between the transmission crank arm and the elastic speed regulation structure satisfies that: in the corresponding period of the transmission crank arm rotation stroke before the closing action, the outer end of the transmission crank arm moves in the long hole, and the elastic speed regulation structure does not act on the transmission crank arm; in the corresponding period of the transmission crank arm rotation stroke between the early stage of closing and the just-closed position, the outer end of the transmission crank arm stretches the elastic speed regulation structure and receives the rotation resistance until the dead point position; in the corresponding period of the transmission crank arm rotation stroke between the just-closed position and the completion of closing, the elastic speed regulation structure is retracted and reset, and the driving force for driving the transmission crank arm to rotate to the completion of closing is provided.

[0016] As a further improvement, the position of the elastic speed regulation structure in the extension direction of the long hole is adjustable.

[0017] As a further improvement, the elastic speed regulation structure comprises a tension spring, and an upper connecting seat and a lower connecting seat at both ends of the tension spring, the upper connecting seat is provided with the long hole, and the lower connecting seat is rotatably installed on the frame.

[0018] As a further improvement, a supporting shaft is rotatably installed on the frame, an adjusting screw is vertically fixed on the supporting shaft, and a threaded connecting hole is arranged on the lower connecting seat, and the adjusting screw is connected with the lower connecting seat through the threaded connecting hole.

[0019] The beneficial effect is that: the present application is improved for the existing vacuum circuit breaker, the transmission crank arm in the present application is fixedly assembled with the main rotating shaft, so that the main rotating shaft drives the transmission crank arm to rotate circumferentially during the closing process of the spring operating mechanism, and the connecting position of the transmission crank arm changes along the extension direction of the long hole during the rotation of the transmission crank arm, so that in the early stage of the closing action, the outer end of the transmission crank arm moves in the long hole, the elastic speed regulation structure does not act on the transmission crank arm, and the elastic speed regulation structure is avoided to intervene in the early stage of closing; in the transmission crank arm rotation stroke corresponding to the early stage of closing to the just-closed position, the outer end of the transmission crank arm stretches the elastic speed regulation structure during the rotation, and the rotation resistance is received, so as to slow down the rotation speed of the main rotating shaft to reduce the closing speed. In the transmission crank arm rotation stroke corresponding to the early stage of closing to the just-closed position, the automatic static contact just contacts, which corresponds to the dead point position of the elastic speed regulation structure, the elastic speed regulation structure is pulled over the dead point by the rotation of the transmission crank arm, the elastic speed regulation structure is retracted and reset, and the elastic speed regulation structure provides an auxiliary driving force for the transmission crank arm, which promotes the dynamic and static contacts from the just-closed position to the closing over-travel position together with the closing spring.

[0020] Without changing the working condition of the spring operating mechanism closing operation, the speed of the vacuum circuit breaker before closing can be effectively reduced, the impact caused by the excessive speed of each component is avoided to damage and affect the service life of the spring operating mechanism and the vacuum arc-extinguishing chamber, the speed of the vacuum circuit breaker after closing is improved, the resistance of the over-travel spring of the vacuum circuit breaker is overcome, the risk of the vacuum circuit breaker closing out of position, refusing to close and insufficient reliability is reduced, the inherent closing critical speed characteristics of the spring operating mechanism are greatly improved, the technical difficulty of matching the closing characteristics of the vacuum circuit breaker and the spring operating mechanism is solved, the output characteristics of the spring operating mechanism and the load characteristics of the vacuum circuit breaker are well matched, and then the adaptability and reliability of the vacuum circuit breaker product are significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 A side view of an embodiment of the vacuum circuit breaker provided by the present application; Figure 2 A Figure 1 middle V direction view; Figure 3 A Figure 1 middle A direction view; Figure 4 For Figure 1 Figure 2 is a middle W direction view of the vacuum circuit breaker of the present application; Figure 5 Figure 3 is a graph of the rotation stroke of the transmission crank of the spring operating mechanism of the vacuum circuit breaker of the present application; Figure 6 Figure 4 is a schematic diagram of the rotation process of the closing cam of the spring operating mechanism of the vacuum circuit breaker of the present application; Figure 7 Figure 5 is a schematic diagram of an embodiment of the elastic speed regulation structure of the present application; In the figure: 1, adjusting bolt; 2, support shaft; 3, tension spring; 4, long hole; 5, transmission crank; 6, main rotating shaft; 7, closing cam; 8, output crank; 9, opening lock system; 10, opening buffer; 11, opening spring; 12, opening reversing sprocket; 13, opening chain; 14, output shaft; 15, opening electromagnet; 16, closing lock system; 17, closing electromagnet; 18, closing lock pin; 19, flywheel joint; 20, flywheel gear; 21, energy storage motor; 22, gear pair; 23, closing reversing sprocket; 24, closing chain; 25, closing spring; 26, frame; 27, upper connecting seat; 28, lower connecting seat; 29, locking nut; 30, connecting pin. DETAILED DESCRIPTION

[0022] The features and performance of the present application are described in further detail below in connection with embodiments.

[0023] For the vacuum circuit breaker, in the closing stage, the force of the closing spring drives the moving contact of the arc extinguishing chamber to act through the cam linkage mechanism in the spring operating mechanism, and the closing spring force and the self-closing force of the arc extinguishing chamber are the power during closing, and after the moving and stationary contacts are in contact, the operating mechanism should also overcome the contact spring force to ensure that the closing is in place.

[0024] The spring operating mechanism disclosed in the invention patent with authorization publication number CN105513910B cited in the background technology only plays a conventional buffering role at the end of closing. It is unable to buffer the closing speed when the spring operating mechanism is subjected to the self-closing force, causing the closing speed to be faster. It also increases the closing speed just after the circuit breaker is closed to overcome the effect of the overtravel spring force of the vacuum circuit breaker and avoid the failure of the circuit breaker not being fully closed. In addition, for vacuum circuit breakers, their closing speed depends on the degree of matching between the output characteristics of the spring operating mechanism used and the load characteristics. This is mainly achieved by adjusting the closing cam profile to reduce the cam's transmission efficiency just before the vacuum circuit breaker is closed, and to improve the cam's transmission efficiency just after the vacuum circuit breaker is closed, thereby meeting the characteristic requirements of the vacuum circuit breaker. For example, the invention patent application with publication number CN101315849A derives a cam profile that is more closely matched with the load characteristics based on the law of conservation of energy and the relationship between the load force and the angle rotated by the main shaft. However, this method results in a significant loss of operating power of the spring operating mechanism and requires multiple tests and corrections. It is not easy to implement and it is difficult to ensure the matching degree. At the same time, it causes the vacuum circuit breaker product to become larger and its reliability to be reduced. Therefore, the present invention improves the existing conventional spring operating mechanism and proposes a spring operating mechanism for a vacuum circuit breaker and a vacuum circuit breaker to solve the technical problem that the conventional spring operating mechanism in the prior art cannot match the characteristic requirements of the vacuum circuit breaker, and when the closing cam profile line in the vacuum circuit breaker is adjusted to match the characteristics, not only will operating power be lost, but multiple corrections are required, which is not only difficult to implement, but also has a poor matching degree.

[0025] The overall design concept of the vacuum circuit breaker provided by the present invention is: like Figures 1-5 As shown, the vacuum circuit breaker includes a spring operating mechanism. A connection hole is provided on the frame 26 of the spring operating mechanism for passing the main rotating shaft 6 of the spring operating mechanism. One end of the transmission crank arm 5 is fixedly assembled with the main rotating shaft 6 after the main rotating shaft 6 passes through the connection hole. The other end of the transmission crank arm 5 is connected to the elastic speed regulating structure. A long hole 4 is provided on one end of the elastic speed regulating structure. The long hole 4 extends in the same direction as the length of the elastic speed regulating structure. The transmission crank arm 5 is connected to the elastic speed regulating structure through the long hole 4. Therefore, during the process of energy storage, closing and opening of the spring operating mechanism, as the main rotating shaft 6 drives the transmission crank arm 5 to rotate synchronously, the connection between the transmission crank arm 5 and the elastic speed regulating structure changes. When the spring operating mechanism performs different operations, the elastic speed regulating structure may be inactive, pulled by the transmission crank arm 5 to provide rotational resistance, or retracted and reset to provide auxiliary driving force for the transmission crank arm 5 to rotate. Therefore, without affecting the spring operating mechanism, the rotation speed of the main rotating shaft 6 is effectively adjusted to adjust the operating speed of the vacuum circuit breaker in different position ranges.

[0026] In order to solve the technical problem of matching the closing characteristics of the vacuum circuit breaker with the spring operating mechanism, the present invention designs the circumferential rotation stroke of the transmission crank arm 5 into α, β, γ, and δ, and uses this to illustrate the specific connection relationship between the transmission crank arm 5 and the elastic speed regulation structure to achieve characteristic matching: Figures 1-6 As shown, under the action of the energy storage motor 21, the main shaft 6 rotates while the closing spring 25 is compressed to store energy. At the same time, because the transmission crank arm 5 rotates synchronously with the main shaft 6, the transmission crank arm 5 rotates through a stroke of δ. As the transmission crank arm 5 rotates, the outer end of the transmission crank arm 5 slides in the long hole 4 to cause the elastic speed regulation structure to swing, thereby completing the energy storage process without the elastic speed regulation structure playing any role.

[0027] In the early stage of the closing action corresponding to the rotation stroke of the transmission crank arm 5, as shown in Figure 5 The rotation stroke of the transmission crank arm 5 is shown as α, that is, the initial starting angle of the spring operating mechanism of the present invention when closing is α. The outer end of the transmission crank arm 5 moves in the long hole 4, thereby driving the elastic speed regulating structure to swing with the rotation of the transmission crank arm 5. At this time, the swing of the elastic speed regulating structure is a follow-up process, and the elastic speed regulating structure does not act on the transmission crank arm 5.

[0028] During the rotation range of the transmission arm 5, which corresponds to the period from the early closing stage to the just-closed position, Figure 5 As shown, under the action of the closing spring 25, the transmission crank arm 5 rotates while the elastic speed regulating structure is stretched at the outer end, and is subjected to the rotational resistance of the elastic regulating structure until the transmission crank arm 5 rotates a β stroke. At this time, the transmission crank arm 5 and the elastic speed regulating structure are collinear, which is called the dead point position, and the moving and static contacts have just touched. In this process, the excessive closing speed caused by the peculiar self-closing force of the vacuum interrupter is affected by the rotational resistance provided by the elastic speed regulating structure, and the excessive closing speed is therefore reduced, so that the vacuum circuit breaker can be driven to the position where the moving and static contacts just touch, that is, the vacuum circuit breaker just closes, by a lower closing speed, thereby avoiding damage to the components due to impact caused by the excessive closing speed, thereby extending the service life of the components.

[0029] During the period from just closing to the completion of closing, that is, the transmission crank arm 5 rotates the γ stroke, at this time, the main shaft 6 rotates to pull the elastic speed regulating structure to rotate past the dead point position, and the elastic speed regulating structure retracts and resets, providing auxiliary driving force for the transmission crank arm 5 to rotate to the completion of closing. Under the joint action of the closing spring 25 and the elastic speed regulating structure, the closing speed of the vacuum circuit breaker just after closing is increased, so as to overcome the resistance of the vacuum circuit breaker overtravel spring, ensure the closing is in place, and reduce the risk of inadequate closing, refusal to close and insufficient reliability of the vacuum circuit breaker.

[0030] The present invention better matches the unique self-closing force of the vacuum circuit breaker and the load characteristics of overcoming the contact spring force after the dynamic and static contacts of the arc extinguishing chamber collide, and adjusts the closing speed of the vacuum circuit breaker. It can effectively reduce the speed of the vacuum circuit breaker just before closing and increase the speed of the vacuum circuit breaker just after closing, meet the load characteristic requirements of the vacuum circuit breaker, realize the adjustable matching of the characteristics of the spring operating mechanism driving the vacuum circuit breaker, improve the mechanical life and reliability of the vacuum circuit breaker product, and ensure the safe and stable operation of the power grid.

[0031] Based on the above overall introduction to the vacuum circuit breaker of the present invention, a more specific embodiment is provided below on the basis of the overall introduction: like Figures 4-5 As shown, the elastic speed regulating structure includes a tension spring and connecting seats at both ends of the tension spring. One of the connecting seats is provided with an elongated hole 4, through which a transmission crank arm 5 is connected to the elastic speed regulating structure. During the closing process, the closing spring 25 releases energy to cause the main shaft 6 to rotate. Between the early closing stage and the just-closed position, the outer end of the transmission crank arm 5 pulls on the tension spring to store a portion of the closing spring 25's energy. As the tension spring 3 is stretched, it blocks further rotation of the transmission crank arm 5, thereby reducing the closing speed of the vacuum circuit breaker. During the period of the transmission crank arm's rotational travel corresponding to just-closed to the completion of closing, the tension spring 3, under the action of the rotation of the transmission crank arm 5, passes through a dead point and releases stored energy, working together with the closing spring 25 to promote closing. Compared to the prior art vacuum circuit breaker spring operating mechanism, which adjusts the closing cam profile to match characteristics, resulting in varying degrees of loss of driving operating work, the elastic speed regulating structure of the present invention achieves energy transfer of operating work at different stages, resulting in high output efficiency and broad application prospects.

[0032] In order to adapt to the needs of different vacuum circuit breaker products, the elastic speed regulating structure is adjustable in the extension direction of the long hole 4, and the initial elastic force of the elastic speed regulating structure is 0. Figure 7 As shown, taking the above-mentioned tension spring 3 as an example, the two ends of the tension spring 3 are connected to a connecting seat. For ease of description, the upper connecting seat 27 is defined as the one with the long hole 4. The support shaft 2 is rotatably mounted on the frame 26. The adjusting bolt 1 passes through the support shaft 2 and is fixed by a lock nut 29, thereby further achieving reliable fixation of the adjusting bolt 1 and the support shaft 2. The lower connecting seat 28 is provided with a threaded connection hole adapted for the adjusting bolt 1. After passing through the support shaft 2, the adjusting bolt 1 is screwed to the lower connecting seat 28 through the threaded connection hole. At this time, rotating the position of the lower connecting seat 28 on the adjusting bolt 1 can extend the extension direction of the hole 4 to change the position of the elastic speed regulating structure on the frame, thereby changing the position of the outer end of the transmission crank arm 5 in the long hole 4, thereby changing the initial starting angle α of the spring operating mechanism of the present invention when closing the circuit breaker. By adjusting the size of the angle α and the angle β, the size of the speed adjustment amount of the elastic speed regulating structure can be controlled to meet the needs of adapting to different vacuum circuit breaker products.

[0033] Specifically, the outer end of the transmission crank arm 5 is provided with a connecting pin 30 matched with the long hole 4, and the connecting pin 30 slides in the long hole 4 during the rotation of the transmission crank arm 5. Meanwhile, in order to further realize the miniaturization of the product and improve the reliability of the vacuum circuit breaker product, the connecting seat is a connecting plate, and the long hole 4 is directly formed on the connecting plate for connecting the transmission crank arm 5 and the elastic speed regulation structure.

[0034] Based on the above overall introduction of the vacuum circuit breaker of the present application, or on the basis of the above-mentioned embodiments of the present application, the following provides a more specific embodiment based on the overall introduction: As Figures 1-5 shown, the transmission crank arm 5 in the present application is connected to the main rotating shaft 6 passing through the connecting hole on the frame, that is, the transmission crank arm 5 is connected to the side of the main rotating shaft 6 away from the closing spring 25, so that the front and rear ends of the spring operating mechanism main rotating shaft 6 are both subjected to the force, which reduces the problem of excessive deformation of the frame caused by the cantilever force due to the fact that the original spring operating mechanism is only subjected to the front flywheel gear spring tension, reduces the risk of mechanism refusal to close, and improves the reliability of the vacuum circuit breaker product.

[0035] The vacuum circuit breaker provided in the present application includes an energy storage system, an opening and closing system, a buffer system and an opening and closing lock catch system, and during the entire transmission process of the vacuum circuit breaker spring operating mechanism closing and energy storage, the rotation angles α, β, γ and δ designed by the elastic speed regulation structure as Figure 5 shown correspond to the closing cam 7 rotation angles α', β', γ' and the circuit breaker input motion angles θ, θ-σ and θ-τ as Figure 6 shown, and the working process of the spring operating mechanism of the vacuum circuit breaker provided in the present application is specifically explained.

[0036] During the energy storage process, the energy storage motor 21 is powered to rotate, drives the flywheel gear 20 to rotate counterclockwise through the gear pair 22, and at the same time, the flywheel joint 19 fixed on the flywheel gear 20 pulls the closing spring 25 through the closing chain 24 to compress the energy storage, until the closing lock catch roller 18 installed on the flywheel gear 20 contacts and remains with the closing lock catch system 16, and the spring operating mechanism closing and energy storage are completed. During the closing process, the main rotating shaft 6 drives the transmission crank arm 5 to rotate, and during the rotation of the transmission crank arm 5 by δ angle, one end of the transmission crank arm 5 always slides in the long hole 4, the elastic speed regulation structure swings at the same time and does not play any role, and does not affect the energy storage working condition of the vacuum circuit breaker spring operating mechanism to the closing spring 25.

[0037] When the closing spring 25 is energized and the closing operation is completed, the closing electromagnet 17 is energized, the closing latch system 16 is released, the flywheel gear 20 is driven to rotate by the closing spring 25 through the closing chain 24 around the closing reversing sprocket 23, the main cam 7 is driven to rotate by the flywheel gear 20 when the flywheel gear 20 rotates, the main crank arm 8 and the output shaft 14 are driven to rotate counterclockwise, the main crank arm 8 contacts and keeps the opening latch system 9, and the closing operation is completed. During the closing process, the main crank arm 8 is rotated, the opening spring 11 is compressed by the opening chain 13, and the opening of the vacuum circuit breaker is prepared.

[0038] To match the load characteristics of the vacuum circuit breaker, the closing process is mainly divided into three stages, and the spring is taken as the tension spring 3 for detailed description. As shown in Figures 5-6 , in the corresponding period of the early stage of the closing action of the transmission crank arm 5, the main cam 7 is driven to rotate an angle α' by the main shaft 6, as shown in Figure 5 , the transmission crank arm 5 is also driven to rotate an angle α by the main shaft 6, the transmission crank arm 5 slides in the long hole 4 to be close to the inner wall of one end of the long hole 4, the tension spring 3 does not play any role, the rotation of the transmission crank arm 5 causes the elastic speed regulation structure composed of the tension spring 3 to swing, and the rotation of the transmission crank arm 5 and the main shaft 6 is not affected, that is, the energy storage process is not affected. And as described above, the position of the elastic speed regulation structure in the extension direction of the long hole 4 can change the position of the outer end of the transmission crank arm 5 in the long hole 4, that is, the initial starting angle α and the size of the starting angle α' of the closing cam 7 can be adjusted, which can effectively adjust the closing starting torque of the vacuum circuit breaker and the closing starting time, thereby optimizing the closing speed and closing time of the vacuum circuit breaker.

[0039] In the corresponding period of the early stage of the closing to the just-closing position of the transmission crank arm, the main cam 7 is driven to rotate an angle β' by the main shaft 6, the main crank arm 8 is driven to rotate an angle σ by the main shaft 6, and the transmission crank arm 5 is driven to rotate an angle β by the main shaft 6. In the process of rotating the transmission crank arm 5, the rotating resistance provided by the tension spring 3 is received, and a part of the energy of the closing spring 25 is stored, so that the elastic operating structure is in contact with the moving and stationary contacts at a low closing speed, that is, the vacuum circuit breaker is in the just-closing position, and the purpose of reducing the closing speed of the vacuum circuit breaker is achieved.

[0040] In the process of the closing cam rotating γ' angle corresponding to the just closing to the closing completion of the transmission crank arm rotating stroke, the main crank arm 8 rotates τ angle, which can drive the driven static contact of the vacuum circuit breaker to rotate from the just contact position to the closing overstroke position, i.e. the theoretical closing position of the vacuum circuit breaker, at this time the transmission crank arm 5 of the closing speed regulating device rotates γ angle, and the transmission crank arm 5 pulls the tension spring 3 to pass the dead point to release the stored energy, which together with the closing spring 25 promotes the closing of the vacuum circuit breaker to achieve the purpose of improving the closing speed of the vacuum circuit breaker, and completes the closing operation process of the vacuum circuit breaker.

[0041] When the opening is performed, the opening electromagnet 15 is powered on to open the opening latch system 9, under the spring force of the opening spring 11, the main crank arm 8 and the output shaft 14 are pulled to rotate clockwise by the opening chain 13 around the opening reversing sprocket 12, the opening operation of the vacuum circuit breaker is realized, and at the same time, at the end of the opening of the vacuum circuit breaker, the buffer 10 of the spring operating mechanism is in action, which effectively adjusts the speed of the vacuum circuit breaker at different position intervals.

[0042] The embodiment of the spring operating mechanism of the vacuum circuit breaker of the present application has the same specific structure as the spring operating mechanism in the above-mentioned embodiment of the vacuum circuit breaker, and will not be described here.

[0043] It should be noted that each specific technical feature described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present application will not further describe various possible combinations.

[0044] In addition, various different embodiments of the present application can be combined in any manner, as long as they do not deviate from the idea of the present application, and they should also be considered as disclosed by the present application.

[0045] The above is only the preferred embodiment of the present application, and does not limit the present application, the patent protection scope of the present application is subject to the claims, any equivalent structural changes made by using the content of the specification and drawings of the present application should also be included in the protection scope of the present application.

Claims

1. The spring operating mechanism of the vacuum circuit breaker includes a frame, a transmission crank arm, and an elastic speed regulating structure. One end of the elastic speed regulating structure is rotatably mounted on the frame, and the other end is connected to the outer end of the transmission crank arm through a long hole. Its characteristics are: The connection between the transmission crank arm and the elastic speed regulating structure satisfies the following requirements: in the early stage of the closing action corresponding to the rotation stroke of the transmission crank arm, the outer end of the transmission crank arm moves in the long hole, and the elastic speed regulating structure does not act on the transmission crank arm; in the period from the early stage of closing to the just-closed position corresponding to the rotation stroke of the transmission crank arm, the outer end of the transmission crank arm stretches the elastic speed regulating structure and is subjected to rotational resistance until the dead point position; in the period from just-closed to the completion of closing corresponding to the rotation stroke of the transmission crank arm, the elastic speed regulating structure retracts and resets, providing auxiliary driving force for the transmission crank arm to rotate until the closing is completed.

2. The spring operating mechanism of the vacuum circuit breaker according to claim 1, characterized in that: The elastic speed regulating structure is positionally adjustable in the extending direction of the long hole.

3. The spring operating mechanism of a vacuum circuit breaker according to claim 1 or 2, characterized in that: The elastic speed regulating structure comprises a tension spring and an upper connecting seat and a lower connecting seat at both ends of the tension spring. The upper connecting seat is provided with the long hole, and the lower connecting seat is rotatably mounted on the frame.

4. The spring operating mechanism of the vacuum circuit breaker according to claim 3, characterized in that: A support shaft is rotatably mounted on the frame, an adjusting bolt is vertically fixed on the support shaft, a threaded connection hole is provided on the lower connecting seat, and the adjusting bolt is connected to the lower connecting seat through the threaded connection hole.

5. A vacuum circuit breaker, wherein the spring operating mechanism comprises a frame, a transmission crank arm, and an elastic speed regulating structure, wherein one end of the elastic speed regulating structure is rotatably mounted on the frame and the other end is connected to the outer end of the transmission crank arm through a long hole, and wherein the spring operating mechanism comprises: The connection between the transmission crank arm and the elastic speed regulating structure satisfies the following requirements: in the early stage of the closing action corresponding to the rotation stroke of the transmission crank arm, the outer end of the transmission crank arm moves in the long hole, and the elastic speed regulating structure does not act on the transmission crank arm; in the period from the early stage of closing to the just-closed position corresponding to the rotation stroke of the transmission crank arm, the outer end of the transmission crank arm stretches the elastic speed regulating structure and is subjected to rotational resistance until the dead point position; in the period from just-closed to the completion of closing corresponding to the rotation stroke of the transmission crank arm, the elastic speed regulating structure retracts and resets, providing auxiliary driving force for the transmission crank arm to rotate until the closing is completed.

6. The vacuum circuit breaker according to claim 5, characterized in that: The elastic speed regulating structure is positionally adjustable in the extending direction of the long hole.

7. The vacuum circuit breaker according to claim 5 or 6, characterized in that: The elastic speed regulating structure comprises a tension spring and an upper connecting seat and a lower connecting seat at both ends of the tension spring. The upper connecting seat is provided with the long hole, and the lower connecting seat is rotatably mounted on the frame.

8. The vacuum circuit breaker according to claim 7, characterized in that: A support shaft is rotatably mounted on the frame, an adjusting bolt is vertically fixed on the support shaft, a threaded connection hole is provided on the lower connecting seat, and the adjusting bolt is connected to the lower connecting seat through the threaded connection hole.

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