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 of the vacuum circuit breaker comprises a closing speed regulation device, and in the closing process, a driving speed regulation gear in the closing speed regulation device drives a driven speed regulation gear to rotate and enables a speed regulation spring to have three conversion processes, namely an initial stretching energy storage state to an early-stage retraction energy release state in sequence; when the speed regulating spring is in the maximum stretching energy storage state, the cam shaft is in the just closed corresponding position from the early-stage retraction energy release state to the maximum stretching energy storage state and from the maximum stretching energy storage state to the later-stage retraction energy release state; in the energy storage process, the speed regulating spring is sequentially switched from the later retraction energy release state to the maximum stretching energy storage state and from the maximum stretching energy storage state to the initial stretching energy storage state. The characteristics of the vacuum circuit breaker are matched through the staged action mode of the speed regulating spring, and the technical problem of matching the closing characteristics of the vacuum circuit breaker and the spring operating mechanism is solved.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum circuit breakers, and in particular to a spring operating mechanism of a vacuum circuit breaker and a vacuum circuit breaker. Background Art

[0002] With the rapid development of the power industry, vacuum circuit breakers have developed more rapidly due to their advantages such as arc extinguishing performance, small size, light weight, and no pollution to the environment. 6 The load force of the circuit breaker in the no-load state is only the gravity of the moving end of the circuit breaker. During the opening and closing movement of the vacuum circuit breaker, it is affected by the unique arc extinguishing chamber self-closing force, arc extinguishing chamber bellows force and contact overtravel spring force, resulting in the load characteristics and SF 6 Circuit breaker load characteristics vary widely.

[0003] In the prior art, for example, a Chinese invention patent with authorization announcement number CN105513910B discloses a spring operating mechanism, which specifically discloses that a frame is provided with independent opening buffers and closing buffers, and the structural forms of the opening buffer and closing buffer can be interchanged. When the spring operating mechanism is closing, at the initial stage of closing, the closing buffer does not play a buffering role due to the effect of the hinged long hole. At the end of closing, the roller bearing rotates to the end of the hinged long hole to drive the closing piston rod to move. The closing buffer begins to intervene and play a buffering role, absorbing the remaining energy of the closing spring, so as to avoid premature intervention of the buffer, increase the initial speed of opening and closing, and effectively avoid damage to the spring operating mechanism caused by a large impact during closing.

[0004] When the above-mentioned closing buffer is applied to the field of vacuum circuit breakers, the closing spring buffer does not work before the vacuum circuit breaker reaches the closed position during the closing process, and the vacuum circuit breaker will close at an unbuffered closing speed. As a result, under the action of the unique self-closing force of the vacuum circuit breaker, the impact force of the closing speed that is too fast is too large, which can easily cause damage to the moving and static contacts due to high-speed impact. The closing buffer only begins to intervene and play a buffering role at the end of the closing stage to reduce the closing speed, which will lead to an overtravel section from the closing of the circuit breaker to the contact of the moving and static contacts. The closing speed weakened by the closing buffer cannot overcome the overtravel spring force of the vacuum circuit breaker, resulting in a failure of the circuit breaker not closing in place, and there is 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 match the characteristics requirements of the vacuum circuit breaker well.

[0005] For a vacuum circuit breaker, its closing speed depends on the degree of matching between the output characteristics of the spring operating mechanism and the load characteristics of the circuit breaker. Generally, the closing cam contour line is adjusted to match the different characteristic requirements during the closing process, that is, the transmission efficiency of the cam is reduced just before the vacuum circuit breaker is closed, and the transmission efficiency of the cam is improved just after the vacuum circuit breaker is closed to meet the characteristic requirements of the vacuum circuit breaker. For example, in the invention patent application with publication number CN101315849A, the contour trajectory of the cam is designed. According to the law of conservation of energy and the relationship between the load force and the angle of rotation of the main shaft, the output force characteristics corresponding to the cam contour line are obtained to be more matched with the load characteristics, thereby reducing the operating work of the spring operating mechanism and alleviating the impact on each component. However, the cam designed in this way cannot ensure that the dynamic characteristics accurately match the load characteristics, and the contour curve still needs to be repeatedly tested and corrected. In addition, the operating work loss of the spring operating mechanism is large, the product volume becomes larger, the reliability is reduced, and it is not easy to implement.

[0006] In summary, with the rise of vacuum environmentally friendly circuit breakers, new requirements have been put forward for the driving characteristics of the circuit breaker drive mechanism. 6 The closing buffer equipped in the circuit breaker cannot match the characteristic requirements of the vacuum circuit breaker. At the same time, when the closing cam contour line is adjusted in the vacuum circuit breaker to match the characteristics, it will not only cause operating power loss, but also the characteristic matching degree is poor, and multiple corrections are required, which is not easy to achieve. 6 As circuit breakers become an inevitable trend in the development of switch technology, the existing spring operating mechanism cannot adapt to the current development needs of vacuum circuit breakers. Summary of the invention

[0007] The object of the present invention is to provide a spring operating mechanism for a vacuum circuit breaker to solve the problems in the prior art with SF 6 The conventional spring operating mechanism that matches the opening and closing characteristics of the circuit breaker cannot match the characteristic requirements of the vacuum circuit breaker. At the same time, when the closing cam contour line needs to be adjusted in the vacuum circuit breaker to match the characteristics, it will not only cause operating power loss, but also the characteristic matching degree is poor, and multiple corrections are required, which is not easy to achieve. The purpose of the present invention is also to provide a vacuum circuit breaker to solve the problem of the prior art with SF 6 The conventional spring operating mechanism that matches the opening and closing characteristics of the circuit breaker cannot match the characteristic requirements of the vacuum circuit breaker. At the same time, when the closing cam contour line needs to be adjusted in the vacuum circuit breaker for characteristic matching, it will not only cause operating power loss, but also the characteristic matching degree is poor, requiring multiple corrections, which is not easy to achieve.

[0008] To achieve the above-mentioned purpose, the technical scheme of the spring operating mechanism of the vacuum circuit breaker provided by the present invention is as follows: the spring operating mechanism of the vacuum circuit breaker comprises a frame, a camshaft for driving the output shaft to rotate to complete the opening and closing of the switch is arranged on the frame, a closing speed regulating device is connected to the camshaft, the closing speed regulating device comprises an active speed regulating gear fixed on the camshaft, a driven speed regulating gear rotatably mounted on the frame and a speed regulating spring, the transmission ratio of the gear set composed of the active speed regulating gear and the driven speed regulating gear is less than 1, one end of the speed regulating spring is eccentrically connected to the driven speed regulating gear, and the other end is connected to the frame, the meshing orientation between the active speed regulating gear and the driven speed regulating gear and the connection position of the speed regulating spring, the driven speed regulating gear and the frame meet the following conditions: when the closing spring is released from the fully stored energy state, the speed regulating gear is released. During the whole process of energy release driving the camshaft to rotate from the corresponding position of the opening switch to the corresponding position of the closing switch, the active speed regulating gear drives the driven speed regulating gear to rotate and causes the speed regulating spring to have three transformation processes, namely, from the initial stretched energy storage state to the early retracted energy release state, from the early retracted energy release state to the maximum stretched energy storage state, and from the maximum stretched energy storage state to the late retracted energy release state. When the speed regulating spring is in the maximum stretched energy storage state, the camshaft rotates to the corresponding position just closed. After the closing switch is completed and the camshaft rotates to store energy for closing, the active speed regulating gear drives the driven speed regulating gear to rotate and causes the speed regulating spring to have two transformation processes, namely, from the late retracted energy release state to the maximum stretched energy storage state, and from the maximum stretched energy storage state to the initial stretched energy storage state.

[0009] As a further improvement, the connection point between the speed regulating spring and the frame is adjustable in the length direction of the speed regulating spring.

[0010] As a further improvement, the speed regulating spring is a tension spring, and an upper connecting seat and a lower connecting seat are provided at both ends of the tension spring. The upper connecting seat is rotatably mounted on the driven speed regulating gear, and the lower connecting seat is rotatably mounted on the frame.

[0011] As a further improvement, a spring seat mounting shaft is rotatably mounted on the frame, an adjusting bolt is vertically fixed on the spring seat mounting 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.

[0012] As a further improvement, the transmission ratio of the active speed regulating gear to the driven speed regulating gear is 1:2.

[0013] The beneficial effect is as follows: the present invention provides a new spring operating mechanism for a vacuum circuit breaker, in which a closing speed regulating device is arranged on the camshaft, and the state of the speed regulating spring changes at different stages of the closing process through the transmission cooperation of the active speed regulating gear and the driven speed regulating gear. From the beginning of closing to the initial stage of closing, the speed regulating spring changes from the initial stretched energy storage state to the early stage of retraction and energy release state, thereby promoting the closing starting torque of the spring operating mechanism of the vacuum circuit breaker. Between the early stage of closing and the just-closed position, the speed regulating spring is pulled from the early stage of retraction and energy release state to the maximum stretched energy storage state, and part of the energy of the closing spring is stored in the speed regulating spring, and is used to slow down the acceleration of the closing speed to protect the contacts from impact. From the just-closed position to the completion of closing, the speed regulating spring changes from the maximum stretched energy storage state to the later stage of retraction and energy release state, and the speed regulating spring releases energy to provide a force to press the contacts to the closing position to reliably ensure that the closing is in place.

[0014] After the closing is completed, the camshaft rotates to store closing energy. The active speed regulating gear also drives the driven speed regulating gear to rotate and causes the speed regulating spring to change during the energy storage process. In the early stage of energy storage, the speed regulating spring changes from the late retracted energy release state to the maximum stretched energy storage state. In the late stage of energy storage, the speed regulating spring changes from the maximum stretched energy storage state to the initial stretched energy storage state. During the entire energy storage process, the speed regulating spring acts as a resistance torque within a certain angle range in the early stage of energy storage of the spring operating mechanism, and acts as a dynamic torque within a certain angle range in the late stage of energy storage. This overcomes the compression of the closing spring for energy storage, and the effect of the gradually increasing force value on the increased force of the energy storage system. It effectively balances the load characteristics of the energy storage system and the energy storage motor, reduces the peak value of the energy storage system, and makes the load of the energy storage motor more stable, thereby improving the reliability of the energy storage system.

[0015] When matching a vacuum circuit breaker, only the closing speed regulating device of the present invention needs to be installed, which is simple to operate, easy to install and highly versatile. The closing speed regulating device can effectively reduce the acceleration of the vacuum circuit breaker just before closing without changing the working conditions of the closing operation of the spring operating mechanism, and avoid damage to various components caused by the impact caused by excessive speed, which affects the service life of the spring operating mechanism and the vacuum arc extinguishing chamber; and overcome the resistance of the overtravel spring of the vacuum circuit breaker, reduce the risk of inadequate closing, refusal to close and insufficient reliability of the vacuum circuit breaker, and achieve precise control of the closing speed by the speed regulating spring in the working process due to different effects on the energy storage process and the closing process due to different stages of stretching or recovery, which greatly improves the characteristics of the inherent closing critical speed of the spring operating mechanism, and solves the technical problem of matching the closing characteristics of the vacuum circuit breaker and the spring operating mechanism through this staged action mode to match the characteristics of the vacuum circuit breaker, so that the output characteristics of the spring operating mechanism and the load characteristics of the vacuum circuit breaker are better matched, thereby significantly improving the adaptability and reliability of the vacuum circuit breaker product.

[0016] To achieve the above-mentioned purpose, the technical solution of the vacuum circuit breaker provided by the present invention is: the vacuum circuit breaker includes a spring operating mechanism of the vacuum circuit breaker, the spring operating mechanism of the vacuum circuit breaker includes a frame, a camshaft for driving the output shaft to rotate to complete the opening and closing of the switch is arranged on the frame, a closing speed regulating device is connected to the camshaft, the closing speed regulating device includes an active speed regulating gear fixed on the camshaft, a driven speed regulating gear rotatably mounted on the frame and a speed regulating spring, the transmission ratio of the gear set composed of the active speed regulating gear and the driven speed regulating gear is less than 1, one end of the speed regulating spring is eccentrically connected to the driven speed regulating gear, and the other end is connected to the frame, the meshing orientation between the active speed regulating gear and the driven speed regulating gear and the connection position of the speed regulating spring, the driven speed regulating gear and the frame meet the following requirements: when the closing spring is During the whole process of releasing energy in the fully stored energy state to drive the camshaft to rotate from the corresponding position of the opening switch to the corresponding position of the closing switch, the active speed regulating gear drives the driven speed regulating gear to rotate and causes the speed regulating spring to have three transformation processes, namely, from the initial stretched energy storage state to the early retracted energy release state, from the early retracted energy release state to the maximum stretched energy storage state, and from the maximum stretched energy storage state to the later retracted energy release state. When the speed regulating spring is in the maximum stretched energy storage state, the camshaft rotates to the corresponding position just closed. After the closing switch is completed, the camshaft rotates to store energy for closing. The active speed regulating gear drives the driven speed regulating gear to rotate and causes the speed regulating spring to have two transformation processes, namely, from the later retracted energy release state to the maximum stretched energy storage state, and from the maximum stretched energy storage state to the initial stretched energy storage state.

[0017] As a further improvement, the connection point between the speed regulating spring and the frame is adjustable in the length direction of the speed regulating spring.

[0018] As a further improvement, the speed regulating spring is a tension spring, and an upper connecting seat and a lower connecting seat are provided at both ends of the tension spring. The upper connecting seat is rotatably mounted on the driven speed regulating gear, and the lower connecting seat is rotatably mounted on the frame.

[0019] As a further improvement, a spring seat mounting shaft is rotatably mounted on the frame, an adjusting bolt is vertically fixed on the spring seat mounting 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.

[0020] As a further improvement, the transmission ratio of the active speed regulating gear to the driven speed regulating gear is 1:2.

[0021] The beneficial effect is as follows: the present invention provides a vacuum circuit breaker improved on the prior art, in which a closing speed regulating device is arranged on the camshaft, and the state of the speed regulating spring changes at different stages of the closing process through the transmission cooperation of the active speed regulating gear and the driven speed regulating gear. From the beginning of closing to the initial stage of closing, the speed regulating spring changes from the initial stretched energy storage state to the early stage of retraction and energy release state, thereby promoting the closing starting torque of the spring operating mechanism of the vacuum circuit breaker. Between the early stage of closing and the just-closed position, the speed regulating spring is pulled from the early stage of retraction and energy release state to the maximum stretched energy storage state, and part of the energy of the closing spring is stored in the speed regulating spring, which is used to slow down the acceleration of the closing speed to protect the contacts from impact. From the just-closed position to the completion of closing, the speed regulating spring changes from the maximum stretched energy storage state to the later stage of retraction and energy release state, and the speed regulating spring releases energy to provide a force to press the contacts to the closing position to reliably ensure that the closing is in place.

[0022] After the closing is completed, the camshaft rotates to store closing energy. The active speed regulating gear also drives the driven speed regulating gear to rotate and causes the speed regulating spring to change during the energy storage process. In the early stage of energy storage, the speed regulating spring changes from the late retracted energy release state to the maximum stretched energy storage state. In the late stage of energy storage, the speed regulating spring changes from the maximum stretched energy storage state to the initial stretched energy storage state. During the entire energy storage process, the speed regulating spring acts as a resistance torque within a certain angle range in the early stage of energy storage of the spring operating mechanism, and acts as a dynamic torque within a certain angle range in the late stage of energy storage. This overcomes the compression of the closing spring for energy storage, and the effect of the gradually increasing force value on the increased force of the energy storage system. It effectively balances the load characteristics of the energy storage system and the energy storage motor, reduces the peak value of the energy storage system, and makes the load of the energy storage motor more stable, thereby improving the reliability of the energy storage system.

[0023] When matching a vacuum circuit breaker, only the closing speed regulating device of the present invention needs to be installed, which is simple to operate, easy to install and highly versatile. The closing speed regulating device can effectively reduce the acceleration of the vacuum circuit breaker just before closing without changing the working conditions of the closing operation of the spring operating mechanism, and avoid damage to various components caused by the impact caused by excessive speed, which affects the service life of the spring operating mechanism and the vacuum arc extinguishing chamber; and overcome the resistance of the overtravel spring of the vacuum circuit breaker, reduce the risk of inadequate closing, refusal to close and insufficient reliability of the vacuum circuit breaker, and achieve precise control of the closing speed by the speed regulating spring in the working process due to different effects on the energy storage process and the closing process due to different stages of stretching or recovery, which greatly improves the characteristics of the inherent closing critical speed of the spring operating mechanism, and solves the technical problem of matching the closing characteristics of the vacuum circuit breaker and the spring operating mechanism through this staged action mode to match the characteristics of the vacuum circuit breaker, so that the output characteristics of the spring operating mechanism and the load characteristics of the vacuum circuit breaker are better matched, thereby significantly improving the adaptability and reliability of the vacuum circuit breaker product. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A side view of an embodiment of the spring operating mechanism of the vacuum circuit breaker provided by the present invention; Figure 2 for Figure 1 Middle V-direction view; Figure 3 for Figure 1 Middle A direction view; Figure 4 for Figure 1 Middle W direction view; Figure 5 A schematic diagram of setting the speed regulating angles of the active speed regulating gear and the driven speed regulating gear in one embodiment of the spring operating mechanism of the vacuum circuit breaker provided by the present invention; Figure 6 The schematic diagram is a rotation process diagram of the closing cam and the cam shaft in the spring operating mechanism of the vacuum circuit breaker provided by the present invention pushing the main crank arm to rotate for closing and energy storage.

[0025] In the figure: 1. driven speed regulating gear; 2. upper joint of speed regulating spring; 3. tension spring; 4. spring seat mounting shaft; 5. adjusting bolt; 6. active speed regulating gear; 7. camshaft; 8. closing cam; 9. main crank arm; 10. opening lock system; 11. opening buffer; 12. opening spring; 13. opening reversing sprocket; 14. opening chain; 15. output shaft; 16. opening electromagnet; 17. upper connecting seat; 18. lower connecting seat; 19. closing lock roller; 20. flywheel joint; 21. flywheel gear; 22. energy storage motor; 23. gear pair; 24. closing reversing sprocket; 25. closing chain; 26. closing spring; 27. closing lock system; 28. closing electromagnet; 29. ​​frame. DETAILED DESCRIPTION

[0026] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0027] For vacuum circuit breakers, in the closing stage, the closing spring force and the arc extinguishing chamber self-closing force are the driving forces, and after the moving and static contacts are in contact, the spring operating mechanism should also overcome the overtravel spring force to ensure that the closing is in place. The common prior art cited in the background technology does not work in the early stage of closing, but after the buffering effect intervenes, it is easy to cause the failure of the circuit breaker to close in place due to the inability to overcome the overtravel spring force of the vacuum circuit breaker. The characteristics of the conventional spring operating mechanism in the prior art cannot match the characteristic requirements of the vacuum circuit breaker well. In addition, for vacuum circuit breakers, the closing speed depends on the matching degree of the output characteristics and load characteristics of the spring operating mechanism used, and the closing speed is mainly achieved by adjusting the closing cam contour line to reduce the transmission efficiency of the cam before the vacuum circuit breaker is closed, and to improve the cam transmission efficiency after the vacuum circuit breaker is closed, so as to meet the characteristic requirements of the vacuum circuit breaker. However, this method requires multiple tests and corrections, is not easy to implement, and is difficult to ensure the matching degree. Based on this, the present invention provides a spring operating mechanism and a vacuum circuit breaker for a vacuum circuit breaker to solve the problems existing in the prior art. The overall design concept of the vacuum circuit breaker provided by the present invention is: During the closing and energy storage process of the spring operating mechanism, the camshaft and the closing cam on the frame push the output crank arm and the output shaft to rotate during the rotation process to drive the contacts to close. The closing speed regulating device including the speed regulating spring is also configured on the camshaft. The angle of rotation of the camshaft and the closing cam during the energy storage and closing process is matched with the speed regulating angle of the closing speed regulating device. With the help of the different stages of the speed regulating spring being stretched to act as a resistance torque and retracting to release energy to act as a power torque, the closing speed regulating device has different effects at different stages. This staged action mode just matches the characteristics of the vacuum circuit breaker, ensuring the reliability, rapidity and stability of the closing operation.

[0028] Specifically, as a basic technical solution, the vacuum circuit breaker includes a bracket, a vacuum interrupter and a spring operating mechanism. The spring operating mechanism includes a frame, and the frame is provided with an energy storage system, a closing system, an opening system, a closing and opening locking system, and an opening buffer system. The structure of the spring operating mechanism that is the same as that of the prior art will not be repeated here. As the core difference from the prior art, such as Figure 1-Figure 4 As shown, the core of the present invention is that the camshaft 7 of the spring operating mechanism is equipped with a closing speed regulating device after passing through the connecting hole on the frame, and the closing speed regulating device includes an active speed regulating gear 6 fixed on the camshaft 7, and a driven speed regulating gear 1 meshing with the active speed regulating gear 6 for transmission, the transmission ratio of the gear set composed of the active speed regulating gear 6 and the driven speed regulating gear 1 is less than 1, and a speed regulating spring is eccentrically rotatably mounted on the driven speed regulating gear 1, and the other end of the speed regulating spring is rotatably mounted on the frame.

[0029] During the closing and energy storage process, as the camshaft 7 and the closing cam 8 rotate, the transmission of the gear set composed of the active speed regulating gear 6 and the driven speed regulating gear 1 is performed, so that at different stages of the spring operating mechanism, the speed regulating spring has different effects on the closing and energy storage process when being pulled by the driven speed regulating gear 1.

[0030] The meshing position between the active speed regulating gear and the driven speed regulating gear and the connection position between the speed regulating spring, the driven speed regulating gear and the frame meet the following requirements: after the closing spring completes energy storage, that is, after the speed regulating spring releases energy in the later stage of energy storage and the energy storage motor jointly stores energy for the closing spring, at the beginning of closing, the speed regulating spring is in the initial stretched state after partial energy release. Similarly, at the beginning of closing, the closing spring begins to release energy to drive the camshaft to rotate from the corresponding position of the opening to the corresponding position of the closing. During the whole process, the active speed regulating gear drives the driven speed regulating gear to rotate and causes the speed regulating spring to have three transformation processes. The sequence is from the initial stretching energy storage state to the early retraction energy release state; from the early retraction energy release state to the maximum stretching energy storage state, at which time the camshaft rotates to the corresponding position of just closing; and from the maximum stretching energy storage state to the late retraction energy release state.

[0031] After the closing is completed and the camshaft rotates to store closing energy, the active speed regulating gear drives the driven speed regulating gear to rotate and causes the speed regulating spring to include two transformation processes, namely, from the late retraction energy release state to the maximum stretching energy storage state, and from the maximum stretching energy storage state to the initial stretching energy storage state.

[0032] The closing speed regulating device effectively adjusts the rotation speed of the active speed regulating gear 6 without affecting the spring operating mechanism, thereby having different effects on the rotation of the output crank arm 9 and the output shaft 15 to adjust the working speed of the vacuum circuit breaker in different position intervals.

[0033] To solve the technical problem of matching the closing characteristics of vacuum circuit breakers and spring operating mechanisms, see Figure 5-Figure 6In the present invention, the transmission ratio of the gear set composed of the active speed regulating gear and the driven speed regulating gear of the closing speed regulating device is 1:2. The active speed regulating gear 6 has five rotation stages of angle α, angle β, angle γ, angle δ, and angle ε in the rotation process from the corresponding state of the opening to the corresponding state of the complete closing and the rotation process from the complete energy release state to the complete energy storage state driven by the energy storage motor 22 after the closing is completed. The corresponding driven speed regulating gear 1 has five speed regulating stages of speed regulating angle AOB, angle BOC, angle COD, angle DOC, and angle COA. Of course, in other embodiments, the transmission ratio of the active speed regulating gear and the driven speed regulating gear can be changed, such as 1:3. At this time, the active speed regulating gear 6 and the driven speed regulating gear 1 still have five rotation stages. The difference is that the angles corresponding to the five stages of the active speed regulating gear are different from the angles corresponding to the five rotation stages of angle α, angle β, angle γ, angle δ, and angle ε in the above embodiment.

[0034] The following is an explanation of the example in which the transmission ratio of the active speed regulating gear to the driven speed regulating gear in the closing speed regulating device in this embodiment is 1:2: When closing the circuit breaker, after releasing the lock of the closing latch system 27, the energy-storing closing spring 26 releases energy, driving the camshaft 7 and the closing cam 8 to rotate, and pushing the main crank arm 9 and the output shaft 15 to rotate counterclockwise through the closing cam 8 until the main crank arm 9 and the output shaft 15 drive the contacts to complete the closing.

[0035] See also Figure 5-Figure 6 The closing process of the spring operating mechanism of the vacuum circuit breaker of the present invention is mainly divided into the following three force-bearing stages to achieve the characteristic matching between the vacuum circuit breaker and the spring operating mechanism: When the rotation stroke of the active speed regulating gear 6 corresponds to the early stage of the closing action, the closing spring 26 releases energy through the camshaft 7 to drive the closing cam 8 to rotate, and the active speed regulating gear 6 rotates synchronously with the camshaft 7. At the same time, the speed regulating spring, which has released part of the energy in the late stage of energy storage, continues to release part of the energy from the initial stretched energy storage state until it becomes the early retracted energy release state. During the state change of the speed regulating spring, the driven speed regulating gear 1 is pulled to rotate, and a rotation assist is applied to the rotation of the active speed regulating gear 6 meshing with it, until the closing cam 8 rotates α'. When the rotation stroke of the active speed regulating gear 6 is α, the driven speed regulating gear 1 rotates 2α, that is, the AOB angle.

[0036] In the early stage of closing, the closing spring 26 releases energy to push the moving contact of the vacuum circuit breaker toward the static contact to realize the closing operation. The speed regulating spring will release its stored energy at the same time. As a booster, the speed regulating spring increases the initial torque of the closing transmission system of the spring operating mechanism, that is, the initial torque is the resistance torque that needs to be overcome at the beginning of the closing process. The assist of the speed regulating spring can make this resistance torque easier to overcome, thereby improving the closing start efficiency of the operating mechanism and making the closing operation faster and more accurate.

[0037] During the rotation stroke of the active speed regulating gear 6 corresponding to the period from the early stage of closing to the just-closed position, the closing spring 26 continues to release energy through the camshaft 7 to drive the closing cam 8 to rotate. The closing cam 8 rotates the β' closing angle, pushing the main crank arm 9 to rotate the σ angle, and can drive the vacuum circuit breaker to the just-contact between the moving and static contacts, that is, the just-closed position of the vacuum circuit breaker. In this process, as the driven speed regulating gear 1 rotates, the speed regulating spring connected to it is stretched, and the speed regulating spring changes from the early retracted energy release state to the maximum stretched energy storage state. Part of the energy of the closing spring 26 is stored in the speed regulating spring, and the active speed regulating gear 6 is subjected to the rotation resistance caused by the elongation of the speed regulating spring during the rotation process, until the active speed regulating gear 6 rotates the β angle and the driven speed regulating gear 1 rotates the BOC angle. At this time, the speed regulating spring is in the dead point position collinear with the OC, and the moving and static contacts are just in contact.

[0038] In the early stage of closing to the just-closed position, the closing spring 26 releases energy, driving the moving contact of the vacuum circuit breaker to move toward the static contact until the moving and static contacts touch, that is, reaching the just-closed position. In this process, the rotation of the camshaft 7 synchronously drives the rotation of the active speed regulating gear 6, and then drives the driven speed regulating gear 1 meshed with it to start moving. Since the driven speed regulating gear 1 is connected to the speed regulating spring, its movement causes the speed regulating spring to be stretched, storing a part of the energy originally belonging to the closing spring 26.

[0039] The elastic potential energy of the closing spring 26 is continuously released, causing the closing speed to naturally show an accelerating trend, that is, the acceleration of the closing speed is a positive value. However, since the speed regulating spring stores a portion of the energy of the closing spring 26, this portion of energy would have further aggravated the increase in the closing speed, but is now absorbed by the speed regulating spring, so the acceleration of the closing speed is reduced, which means that although the closing speed is still increasing, its growth rate, i.e., the acceleration, has slowed down. The closing speed regulating device of the present invention does not change the overall increasing trend of the closing speed at this stage, but cleverly slows down the growth rate of the closing speed, making the closing process smoother, which not only avoids the collision damage of the moving and static contacts caused by the excessive closing speed, but also ensures the adequacy and continuity of the closing process.

[0040] During the period from just closing to completion of closing, the closing spring 26 continues to release energy through the camshaft 7 to drive the closing cam 8 to rotate. The closing cam 8 rotates by a closing angle of γ', pushing the main crank arm 9 to rotate by an angle of τ, and can drive the vacuum circuit breaker to rotate from the just-contact position of the moving and static contacts to the closing overtravel position, that is, the theoretical closing position of the vacuum circuit breaker. At this time, the active speed regulating gear 6 rotates by an angle of γ, and the driven speed regulating gear 1 rotates to pull the speed regulating spring from the maximum stretched energy storage state to the later retracted energy release state. At this time, the maximum stretched energy storage state of the speed regulating spring is the dead point position where the speed regulating spring is colinear with the OC. After the speed regulating spring is pulled to cross the dead point position, the released stored energy works together with the force of the closing spring 26 to further promote the closing process of the vacuum circuit breaker. It also provides a force to press the contacts tightly in the closed position, avoiding the separation of the contacts due to closing bounce and other reasons caused by the overtravel spring, ensuring the proper and tight closing, improving the stability and reliability of the closing, thereby ensuring the normal electrical and mechanical performance of the circuit breaker.

[0041] See also Figure 1-Figure 6 , the energy storage motor 22 in the energy storage system is started, so that the camshaft 7 rotates counterclockwise, and the active speed regulating gear 6 fixed on the camshaft 7 rotates synchronously. When the active speed regulating gear 6 rotates δ, it drives the driven speed regulating gear 1 meshed with it to rotate. At this time, the last closing process has just been completed. When the last closing process is completed, the speed regulating spring is in a state of releasing energy to press the contact in the closing position. The energy of the speed regulating spring is not completely released. It only needs to release the energy to overcome the overtravel spring force to ensure reliable closing. At this time, the speed regulating spring is pulled by the driven speed regulating gear 1 from the late retracted energy release state after the closing is completed. The driven speed regulating gear 1 runs from OD to OC, and the rotation angle is DOC. The speed regulating spring is pulled from the late retracted energy release state to the maximum stretched energy storage state, that is, the speed regulating spring is on the extension line of OC, and the position of the speed regulating spring and OC in line is also the dead point position. In this process, the closing spring is in a state of low energy density in the early stage. The energy storage motor 22 needs to store energy for the closing spring 26 and the speed regulating spring 3 of the spring operating mechanism at the same time. When the camshaft 7 continues to rotate counterclockwise and drives the active speed regulating gear 6 to rotate ε at the same time, the driven speed regulating gear 1 runs from OC to OA, and the rotation angle is COA. After the speed regulating spring is pulled from the maximum stretched energy storage state at the dead point position, it immediately retracts and resets to change to the initial stretched energy storage state. During this process, the closing spring is in a state with a higher energy density in the later stage. The energy storage motor and the speed regulating spring 3 simultaneously store energy for the closing spring 26 of the spring operating mechanism until the energy storage of the closing spring 26 is completed.

[0042] According to the elastic potential energy formula, in the initial stage of energy storage of the closing spring, the compression of the closing spring is small. At this time, the elastic potential energy stored in the closing spring is also small, and the work that the energy storage motor needs to do when compressing to overcome the reaction force of the closing spring, that is, the input energy, is also relatively small.

[0043] As the energy storage process proceeds, the compression of the closing spring gradually increases, and the elastic potential energy stored in the closing spring also increases. The energy storage motor needs to overcome the gradually increasing elastic potential energy to continue to compress the closing spring, and needs to input more energy to do work. In this process, the energy released by the speed regulating spring and the output energy of the energy storage motor act together on the closing spring, thereby effectively reducing the energy storage motor needs to overcome the huge elastic potential energy of the closing spring in the later stage of energy storage. The speed regulating spring shares part of the workload that was originally required to be borne by the energy storage motor alone. The energy release of the speed regulating spring in the later stage of energy storage effectively reduces the maximum force that the energy storage motor needs to provide in the most difficult compression stage of the closing spring, thereby reducing the peak load of the motor, making the load of the motor more stable, reducing the risk of motor overheating or damage due to load mutations, and increasing the reliability and service life of the energy storage motor.

[0044] The present invention can better match the self-closing force unique to vacuum circuit breakers and the load characteristics of the contact spring force that needs to be overcome after the dynamic and static contacts of the arc extinguishing chamber collide, and adjust the closing speed of the vacuum circuit breaker, which can effectively slow down the speed increase of the vacuum circuit breaker just before closing, and provide an additional force on the basis of the closing spring just after closing to overcome the overtravel spring force, so that the contacts are pressed in the closing position to form a stable and close contact. The load characteristic requirements of the vacuum circuit breaker are met, and the characteristic matching of the spring operating mechanism driving the vacuum circuit breaker is adjustable, which improves the mechanical life and reliability of the vacuum circuit breaker product and ensures the safe and stable operation of the power grid.

[0045] 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: This embodiment focuses on the detailed description of the assembly and adjustment of the closing speed regulating device.

[0046] like Figure 4-Figure 5As shown, the speed regulating spring 3 is a tension spring, and an upper connecting seat and a lower connecting seat are provided at both ends of the tension spring. For the convenience of description, the upper connecting seat 17 is defined as the one that is rotatably connected to the driven speed regulating gear 1, and a spring seat mounting shaft 4 is rotatably mounted on the frame 29. The upper connecting seat is rotatably mounted on the driven speed regulating gear 1 through the speed regulating spring upper joint 2, and the lower connecting seat is rotatably mounted on the frame 29 through the spring seat mounting shaft 4. Specifically, both the upper connecting seat 17 and the lower connecting seat 18 can be rotatably matched through the rotating shaft. In order to further realize product miniaturization and improve the reliability of vacuum circuit breaker products, the connecting seat is a connecting plate. Or in other embodiments, a mounting hole or an axial hole is eccentrically set on the driven speed regulating gear, and a corresponding mounting bracket is set on the frame. Both ends of the tension spring may have matching hooks or holes, so that it can be directly inserted or hung on the driven speed regulating gear and the frame.

[0047] In order to adapt to the needs of different vacuum circuit breaker products, the connection point between the speed regulating spring and the frame is adjustable in the length direction of the speed regulating spring, such as Figure 5 As shown, the spring seat mounting shaft 4 is rotatably mounted on the frame 29, and the adjusting bolt 5 passes through the spring seat mounting shaft 4 and is fixed by a locking nut, thereby further realizing the reliable fixation of the adjusting bolt 5 and the spring seat mounting shaft 4. A threaded connection hole adapted to the adjusting bolt 5 is provided on the lower connecting seat 18. After the adjusting bolt 5 passes through the spring seat mounting shaft 4, it is screwed to the lower connecting seat 18 through the threaded connection hole. At this time, the position of the lower connecting seat 18 on the adjusting bolt 5 is rotated to effectively adjust the force value of the tension spring and control the adjustment amount of the closing speed to meet the needs of adapting different vacuum circuit breaker products. Alternatively, in other embodiments, a plurality of hanging rings or holes can be arranged on the mounting bracket rotatably mounted on the frame, so that one end of the tension spring can be connected to the hanging ring or hole at an appropriate position according to actual needs.

[0048] like Figure 1-Figure 4 As shown, the camshaft 7 of the spring operating mechanism is connected to the closing cam 8, and in the process of synchronous rotation of the camshaft 7 and the closing cam 8, the main crank arm 9 and the output shaft 15 can be pushed to perform the opening and closing operation. After the camshaft 7 passes through the connection hole on the frame, the closing speed regulating device is installed on the other side of the frame. By adding the closing speed regulating device at the rear end of the camshaft 7, the front and rear ends of the camshaft of the spring operating mechanism are both affected by the spring force, which reduces the problem of the frame being deformed by the excessive cantilever force caused by the original spring operating mechanism being only affected by the spring tension of the front flywheel gear, reduces the risk of the mechanism refusing to close, and improves the product reliability.

[0049] 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: This embodiment focuses on a detailed description of the working process of the closing speed regulating device.

[0050] During the entire transmission process of closing and energy storage of the spring operating mechanism of the vacuum circuit breaker, Figure 5 As shown, the transmission ratio of the gear set composed of the active speed regulating gear and the driven speed regulating gear is 1:2, and the active speed regulating gear 6 of the closing speed regulating device has five speed regulating stages of speed regulating angle α, angle β, angle γ, angle δ, and angle ε, and the corresponding driven speed regulating gear 1 has five speed regulating stages of speed regulating angle AOB, angle BOC, angle COD, angle DOC, and angle COA. Figure 6 As shown, the active speed regulating gear 6 of the closing speed regulating device has speed regulating angles α, β, and γ, corresponding to Figure 6 The middle closing cam 8 rotates angles α', β', γ' and the circuit breaker input moves angles θ, θ-σ, and θ-τ. The working process of the spring operating mechanism of the vacuum circuit breaker provided by the present invention is described in detail below.

[0051] Closing process of the spring operating mechanism of the vacuum circuit breaker: The closing electromagnet 28 is energized to open the closing latch system 27. Under the spring force of the closing spring 26, the closing chain 25 bypasses the closing reversing sprocket 24 to pull the flywheel gear 21 to rotate. The flywheel gear 21 drives the closing cam 8 to rotate through the camshaft 7, pushing the main crank arm 9 and the output shaft 15 to rotate counterclockwise until the main crank arm 9 is in contact with the opening lock system 10 to complete the closing operation of the spring operating mechanism. During the closing process of the vacuum circuit breaker spring operating mechanism, the main crank arm 9 pulls the opening spring 12 through the opening chain 14 to compress the stored energy, preparing for the opening of the vacuum circuit breaker.

[0052] The closing process of the spring operating mechanism is divided into the following three force-bearing stages to achieve the characteristic matching between the vacuum circuit breaker and the spring operating mechanism: Figure 6 (I) The closing spring 26 has completed energy storage and the circuit breaker is in the open state. Figure 6 (I) to Figure 6 (II) During the process of the closing cam 8 rotating the closing angle α', the main crank arm 9 does not rotate. Figure 5 The active speed regulating gear 6 of the closing speed regulating device rotates by an angle of α, the driven speed regulating gear 1 rotates by an angle of AOB, and the speed regulating spring 3 continues to release energy, which promotes the closing starting torque of the spring operating mechanism of the vacuum circuit breaker and improves the closing starting efficiency of the operating mechanism.

[0053] See also Figure 6 (II) to Figure 6 (III) During the process of the closing cam 8 rotating the closing angle β', the closing cam 8 pushes the main crank arm 9 to rotate the angle σ, thereby driving the vacuum circuit breaker to the position where the moving and static contacts just touch, that is, the vacuum circuit breaker just closes. Figure 5The active speed regulating gear 6 of the closing speed regulating device rotates by an angle of β, and the driven speed regulating gear 1 rotates by an angle of BOC. At this time, the driven speed regulating gear 1 pulls the speed regulating spring 3 to move, and part of the energy of the closing spring 26 is stored in the speed regulating spring 3, thereby reducing the increase in the closing speed during the closing process of the vacuum circuit breaker.

[0054] See also Figure 6 (III) to Figure 6 (IV) During the process of the closing cam 8 rotating the closing angle γ', the closing cam 8 pushes the main crank arm 9 to rotate the angle τ, thereby driving the vacuum circuit breaker to rotate from the moving and static contacts just contacting position to the closing overtravel position, that is, the theoretical closing position of the vacuum circuit breaker. In this process, refer to Figure 5 The active speed regulating gear 6 of the closing speed regulating device rotates by an angle of γ, and the driven speed regulating gear 1 rotates by an angle of COD, that is, the driven speed regulating gear 1 pulls the speed regulating spring 3 past the dead point to release the stored energy, and the speed regulating spring 3 and the closing spring 26 jointly promote the closing of the vacuum circuit breaker, thereby achieving the purpose of increasing the closing speed of the vacuum circuit breaker and completing the closing operation process of the vacuum circuit breaker.

[0055] Energy storage process of the spring operating mechanism of the vacuum circuit breaker: The energy storage motor 22 is powered and rotates, driving the flywheel gear 21 to rotate counterclockwise through the gear pair 23. The flywheel connector 20 fixed on the flywheel gear 21 pulls the closing spring 26 through the closing chain 25 to compress and store energy until the closing lock roller 19 installed on the flywheel gear 21 is in contact with the closing lock system 27, completing the closing energy storage of the spring operating mechanism. This process is referred to Figure 6 In 6 (Ⅳ) to 6 (Ⅴ), the camshaft 7 rotates synchronously with the closing cam 8, and the driven speed regulating gear 1 rotates counterclockwise from OD to OC through the active speed regulating gear 6, and the speed regulating spring is pulled to the dead point position, that is, the energy storage motor 22 works and stores energy for the closing spring 26 and the speed regulating spring at the same time. As the energy storage motor 22 continues to work, the speed regulating spring continues to be pulled past the dead point position, and the driven speed regulating gear 1 runs from OC to OA, and rotates at an angle of COA. During this process, the closing spring is in a state with a higher energy density in the later stage, and the energy storage motor and the speed regulating spring 3 jointly store energy for the closing spring 26 until the closing spring 26 is closed. Figure 6 The circuit breaker shown in (V) is in the closed state and the closing spring 26 has completed energy storage.

[0056] like Figure 2As shown, at the end of the above energy storage process, the closing lock roller 19 impacts the closing lock system 27, completing the closing energy storage locking function of the spring operating mechanism. In this process, the closing lock roller 19 and the closing lock system 27 are subjected to impact force, which may easily reduce the reliability of the lock system. Through the action of the gear pair 23, the impact speed of the closing spring energy storage lock is effectively reduced, the impact force of the closing lock system is reduced, and the reliability of the closing lock system of the spring operating mechanism is improved.

[0057] The opening process of the spring operating mechanism of the vacuum circuit breaker: The opening electromagnet 16 is energized to open the opening latch system 10. Under the spring force of the opening spring 12, the opening chain 14 bypasses the opening reversing sprocket 13 to pull the main crank arm 9 and the output shaft 15 to rotate clockwise to realize the opening operation of the vacuum circuit breaker. At the same time, at the end of the opening of the vacuum circuit breaker, the opening buffer 11 of the spring operating mechanism takes effect to effectively adjust the speed of the vacuum circuit breaker in different opening position intervals, meet the characteristic requirements of the vacuum circuit breaker, and improve product reliability.

[0058] The specific structure of the embodiment of the spring operating mechanism of the vacuum circuit breaker of the present invention is the same as the structure of the spring operating mechanism in the embodiment of the vacuum circuit breaker introduced above, and will not be described in detail herein.

[0059] 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. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0060] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. The spring operating mechanism of the vacuum circuit breaker is characterized by: The invention comprises a frame, on which a camshaft for driving an output shaft to rotate to complete opening and closing of the switch is arranged, and a closing speed regulating device is connected to the camshaft, and the closing speed regulating device comprises an active speed regulating gear fixed on the camshaft, a driven speed regulating gear rotatably mounted on the frame, and a speed regulating spring, the transmission ratio of a gear set composed of the active speed regulating gear and the driven speed regulating gear is less than 1, one end of the speed regulating spring is eccentrically connected to the driven speed regulating gear, and the other end is connected to the frame, and the meshing orientation between the active speed regulating gear and the driven speed regulating gear and the connection position of the speed regulating spring, the driven speed regulating gear and the frame meet the following conditions: when the closing spring releases energy from a fully stored energy state, the camshaft is driven to rotate from a position corresponding to the opening of the switch to a position corresponding to the closing of the switch. During the entire process of movement, the active speed regulating gear drives the driven speed regulating gear to rotate and causes the speed regulating spring to have three transformation processes, namely, from the initial stretched energy storage state to the early retracted energy release state, from the early retracted energy release state to the maximum stretched energy storage state, and from the maximum stretched energy storage state to the late retracted energy release state. When the speed regulating spring is in the maximum stretched energy storage state, the camshaft rotates to the corresponding position just closed. After the closing is completed and the camshaft rotates to store energy for closing, the active speed regulating gear drives the driven speed regulating gear to rotate and causes the speed regulating spring to have two transformation processes, namely, from the late retracted energy release state to the maximum stretched energy storage state, and from the maximum stretched energy storage state to the initial stretched energy storage state.

2. The spring operating mechanism of the vacuum circuit breaker according to claim 1, characterized in that: The connection point between the speed regulating spring and the frame can be adjusted in the length direction of the speed regulating spring.

3. The spring operating mechanism of the vacuum circuit breaker according to claim 2, characterized in that: The speed regulating spring is a tension spring, and an upper connecting seat and a lower connecting seat are arranged at both ends of the tension spring. The upper connecting seat is rotatably mounted on the driven speed regulating gear, 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 is characterized in that: A spring seat installation shaft is rotatably installed on the frame, an adjusting bolt is vertically fixed on the spring seat installation shaft, a threaded connection hole is arranged on the lower connecting seat, and the adjusting bolt is connected with the lower connecting seat through the threaded connection hole.

5. The spring operating mechanism of the vacuum circuit breaker according to any one of claims 1 to 4, characterized in that: The transmission ratio of the active speed regulating gear to the driven speed regulating gear is 1:

2.

6. A vacuum circuit breaker, including a spring operating mechanism for the vacuum circuit breaker, characterized in that: The spring operating mechanism of the vacuum circuit breaker includes a frame, on which a camshaft for driving the output shaft to rotate to complete the opening and closing of the switch is arranged, and a closing speed regulating device is connected to the camshaft, and the closing speed regulating device includes an active speed regulating gear fixed on the camshaft, a driven speed regulating gear rotatably mounted on the frame, and a speed regulating spring, the transmission ratio of the gear set composed of the active speed regulating gear and the driven speed regulating gear is less than 1, one end of the speed regulating spring is eccentrically connected to the driven speed regulating gear, and the other end is connected to the frame, and the meshing orientation between the active speed regulating gear and the driven speed regulating gear and the connection position of the speed regulating spring, the driven speed regulating gear and the frame meet the following requirements: when the closing spring releases energy from the fully stored energy state to drive the camshaft from the opening corresponding position to the closing position During the entire process of the gate rotating to the corresponding position, the active speed regulating gear drives the driven speed regulating gear to rotate and causes the speed regulating spring to have three transformation processes, namely, from the initial stretched energy storage state to the early retracted energy release state, from the early retracted energy release state to the maximum stretched energy storage state, and from the maximum stretched energy storage state to the later retracted energy release state. When the speed regulating spring is in the maximum stretched energy storage state, the camshaft rotates to the corresponding position just closed. After the closing is completed and the camshaft rotates to store energy for closing, the active speed regulating gear drives the driven speed regulating gear to rotate and causes the speed regulating spring to have two transformation processes, namely, from the later retracted energy release state to the maximum stretched energy storage state, and from the maximum stretched energy storage state to the initial stretched energy storage state.

7. The vacuum circuit breaker according to claim 6, characterized in that: The connection point between the speed regulating spring and the frame can be adjusted in the length direction of the speed regulating spring.

8. The vacuum circuit breaker according to claim 7, characterized in that: The speed regulating spring is a tension spring, and an upper connecting seat and a lower connecting seat are arranged at both ends of the tension spring. The upper connecting seat is rotatably mounted on the driven speed regulating gear, and the lower connecting seat is rotatably mounted on the frame.

9. The vacuum circuit breaker according to claim 8, characterized in that: A spring seat installation shaft is rotatably installed on the frame, an adjusting bolt is vertically fixed on the spring seat installation shaft, a threaded connection hole is arranged on the lower connecting seat, and the adjusting bolt is connected with the lower connecting seat through the threaded connection hole.

10. The vacuum circuit breaker according to any one of claims 6 to 9, characterized in that: The transmission ratio of the active speed regulating gear to the driven speed regulating gear is 1:2.

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