Spring operating mechanism

Abstract

The invention relates to the field of operating mechanisms of circuit breakers, in particular to a spring operating mechanism. The spring operating mechanism comprises a machine frame, a closing energy storage system, a closing lock catch system and an opening energy storage system are installed on the machine frame, the opening lock catch system and the closing energy storage system comprise a closing main rotating shaft, a closing rotating wheel is installed on the closing main rotating shaft, a closing spring is connected between the closing rotating wheel and the machine frame, a closing roller is arranged on the closing rotating wheel, and a closing roller is arranged on the closing roller. The switching-on energy storage system further comprises a switching-on driving unit. The opening energy storage system comprises an opening main rotating shaft, the opening main rotating shaft is provided with an opening main crank arm, an opening spring is connected between the opening main crank arm and the rack, and the opening main crank arm is provided with an opening latch; and a closing cam is arranged on the closing main rotating shaft. The spring operating mechanism is simple in transmission system, compact in structure, high in transmission efficiency and stable in transmission, and the reliability of the spring operating mechanism is improved.

Description

Technical Field

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

[0002] In order to achieve oil-free high-voltage switchgear and stable operation, spring operating mechanisms are increasingly used in high-voltage switchgear. As a driving device for the opening and closing operations of circuit breakers, the performance and quality of spring operating mechanisms will directly affect the mechanical characteristics of circuit breakers. At present, the opening release of the commonly used spring operating mechanisms mostly adopts a semi-axis release method. The closing transmission system usually adopts a cam combined with a four-link transmission method. There are multiple sets of spring sleeves outside the closing spring and the opening spring. The spring sleeve cooperates with the transmission system to store energy for the closing spring and the opening spring. At the same time, the transmission system is mostly chain transmission, the structure is relatively complex, and the number of parts is large, which makes the manufacturing process of the spring operating mechanism more difficult and the reliability is low.

[0003] For example, a Chinese invention patent application with application publication number CN118658756A and application publication date September 17, 2024 discloses a spring operating mechanism, which includes a clamping plate and a disconnecting spring, one end of the disconnecting spring is connected to a disconnecting spring seat, one end of the disconnecting spring seat is connected to the disconnecting spring, and the other end is connected to an output crank arm, a motor is arranged on one side of the clamping plate, the motor is connected to a gear set through a gear transmission, the gear set is meshed with a main gear, an outer chain is fixedly connected to the main gear, one end of the outer chain is connected to an outer sprocket, the outer sprocket is connected to an inner sprocket through a rotating shaft, the inner sprocket is connected to a closing spring seat through an inner chain, the inner chain sleeve is provided with a closing spring, and the end of the closing spring away from the closing spring seat is fixedly connected to the clamping plate. The spring operating mechanism drives the outer chain to move through the main gear, thereby driving the outer sprocket and the inner sprocket to rotate. Under the action of the inner chain, the closing spring is pulled to store energy in the closing spring. When the closing spring is released, the main gear drives the output crank arm to rotate, thereby compressing the opening spring to store energy in the opening spring. The spring operating mechanism uses a chain to pull the spring seat to store energy in the closing spring, and a spring seat is set on the closing spring and the opening spring. There are many parts and the structure is relatively complex. Summary of the invention

[0004] The object of the present invention is to provide a spring operating mechanism to solve the problem that the energy storage system of the existing spring operating mechanism adopts a relatively complex chain transmission structure.

[0005] To achieve the above object, the spring operating mechanism of the present invention adopts the following technical solutions: The spring operating mechanism comprises a frame, on which a closing energy storage system, a closing lock system, an opening energy storage system and an opening lock system are installed. The closing energy storage system comprises a closing main rotating shaft, on which a closing wheel is installed, a closing spring is connected between the closing wheel and the frame, and the connection position between the closing spring and the closing wheel is eccentrically arranged, and a closing roller for cooperating with the closing lock system is arranged on the closing wheel. The closing energy storage system also comprises a device for driving the closing main rotating shaft to rotate to pass A closing drive unit is provided for storing closing energy by stretching the closing spring through the closing wheel; the opening energy storage system includes an opening main shaft, on which a opening main crank arm is installed, an opening spring is connected between the opening main crank arm and the frame, and an opening latch for cooperating with the opening locking system is provided on the opening main crank arm; a closing cam is provided on the closing main shaft, and when the closing action is in progress, the closing cam rotates and drives the opening main crank arm to rotate through its cam profile and pulls the opening spring to store opening energy.

[0006] Furthermore, the frame includes front and rear clamping plates arranged at a relative interval, the closing main shaft passes through the front and rear clamping plates respectively and is rotatably assembled with the front and rear clamping plates, the closing wheel, closing spring and closing lock system are all arranged on the front side of the front clamping plate, and the closing cam, opening energy storage system and opening lock system are all arranged in the space between the front and rear clamping plates.

[0007] Furthermore, the closing wheel is a gear structure, and the closing drive unit includes a drive motor and a transmission gear set, and the transmission gear set is meshed with the closing wheel for transmission.

[0008] Furthermore, the drive motor is installed on the front side of the front clamping plate, and the output end extends between the front and rear clamping plates and is connected to the transmission gear set. The output end of the transmission gear set is arranged on the front side of the front clamping plate and meshes with the closing wheel.

[0009] Furthermore, the closing lock system includes a closing electromagnet, a closing catch and a closing bolt. The closing catch cooperates with the closing roller to realize the closing lock system to complete the locking. When the closing action is performed, the closing electromagnet pushes the closing bolt to separate the closing catch and the closing roller, so that the closing lock system completes the unlocking.

[0010] Furthermore, the opening brake locking system includes an opening brake electromagnet, a first-level opening brake catch and a second-level opening brake catch. When the main crank arm rotates under the action of the closing cam, the second-level opening brake catch contacts the opening brake catch on the main crank arm to complete the locking of the opening brake locking system. When the opening brake action is in progress, the opening brake electromagnet pushes the opening brake lock bolt to separate the first-level opening brake catch and the second-level opening brake catch, and then separates the second-level opening brake catch from the opening brake catch, so that the opening brake locking system is unlocked.

[0011] Furthermore, a closing buffer is arranged inside the closing spring.

[0012] Furthermore, the opening brake buffer is a hydraulic buffer.

[0013] Furthermore, an energy storage control system is arranged on the outer side surface of the rear splint, and the energy storage control system includes a micro switch and an energy storage control cam. The energy storage control cam is installed on one end of the rear splint where the closing main shaft extends out. The contacts of the micro switch cooperate with the cam profile of the energy storage control cam to realize the start and stop control of the drive motor.

[0014] Beneficial effects: The spring operating mechanism of the present invention is a pioneering invention. The closing spring of the spring operating mechanism of the present invention is installed on the closing wheel, and the closing wheel is driven by the motor to rotate, thereby pulling the closing spring to store energy. After the closing is completed, the main crank arm of the opening switch pulls the opening switch spring to store energy under the action of the closing cam, making the closing energy storage and opening energy storage processes simpler. The closing main shaft can realize the energy storage of the closing spring and the power connection between the closing energy storage system and the opening energy storage system under the action of the closing drive unit. The transmission between the opening main shaft and the closing spring is simpler, the number of parts of the transmission system is reduced, the structure is more compact, the transmission efficiency is higher, the transmission is more stable, and the mechanical life of the spring operating mechanism is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the spring operating mechanism of the present invention; Figure 2 The spring operating mechanism of the present invention Figure 1 A left side view of the embodiment; Figure 3 The spring operating mechanism of the present invention Figure 2 Sectional view in the AA direction of the left view; Figure 4 The spring operating mechanism of the present invention Figure 3 Rear view: Sectional view in direction BB; Figure 5 It is a structural schematic diagram of the closing main shaft system of the spring operating mechanism of the present invention.

[0016] In the figure: 1. front clamping plate; 2. rear clamping plate; 3. opening lock system; 4. opening buffer; 5. closing drive unit; 6. closing spring; 7. closing lock system; 8. closing wheel; 9. opening main crank arm; 10. opening main shaft; 11. closing cam; 12. closing main shaft; 13. opening spring; 14. micro switch; 15. energy storage control cam; 16. closing electromagnet; 17. closing catch; 18. closing lock bolt; 19. closing roller; 20. opening 1. Brake electromagnet; 21. First-stage brake release; 22. Second-stage brake release; 23. Brake lock bolt; 24. Brake release; 25. Bolt; 26. Gasket; 27. Spring joint; 28. Lock nut; 29. ​​Closing plate; 30. Adjusting screw; 31. Mounting column; 32. Auxiliary switch; 33. Anti-air closing system; 34. Brake buffer cylinder; 35. Piston rod; 36. Pin; 37. Buffer pin; 38. Drive motor; 39. Bearing; 40. Cam roller. DETAILED DESCRIPTION

[0017] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0018] The spring operating mechanism of the present invention stores energy in the closing spring through the coordinated transmission of the closing main shaft and the closing drive unit, and at the same time realizes the power connection between the closing main shaft and the opening main shaft through the closing cam on the closing main shaft, thereby storing energy in the opening spring. The transmission structure is simpler and more compact, the transmission is more stable, and the reliability of the operating mechanism is greatly improved.

[0019] In a basic embodiment, Figure 1 As shown, the frame of the spring operating mechanism includes a front plate 1 and a rear plate 2, which are arranged opposite to each other, and the front plate 1 and the rear plate 2 are connected and fixed by a plurality of support columns. A closing energy storage system and a closing lock system 7 are arranged on the outer side of the front plate 1, and an opening energy storage system and an opening lock system are arranged between the front plate 1 and the rear plate 2. The closing energy storage system includes a closing main shaft 12 and a closing drive unit 5, and the closing drive unit 5 is arranged between the front plate 1 and the rear plate 2. The closing drive unit 5 is connected to the closing main shaft 12 through a closing wheel 8, and a closing cam 11 is installed on the closing main shaft 12. Figure 2As shown, both ends of the closing main rotating shaft 12 are rotatably connected to the front clamping plate 1 and the rear clamping plate 2 through bearings 39, both ends of the closing main rotating shaft 12 have protruding portions that exceed the front clamping plate 1 and the rear clamping plate 2, the closing cam 11 is installed on the closing main rotating shaft 12, the closing wheel 8 is installed on the end of the closing main rotating shaft 12 that exceeds the front clamping plate 1, one end of the closing spring 6 is installed on the closing wheel 8, and the other end is installed on the front clamping plate 1, the connection position of the closing spring 6 and the closing wheel 8 is eccentrically set, and the closing wheel 8 is provided with a closing lock The closing roller 19 cooperates with the latch system 7, and the opening energy storage system includes an opening main crank arm 9, an opening main rotating shaft 10 and an opening spring 13. The two ends of the opening main rotating shaft 10 are rotatably connected to the front clamping plate 1 and the rear clamping plate 2 through bearings. The opening main crank arm 9 is installed on the opening main rotating shaft 10. The opening main crank arm 9 is equipped with an opening latch 24 that cooperates with the opening locking system. When the closing action is performed, the closing cam 11 rotates and drives the opening main crank arm 9 to rotate through its cam profile and pulls the opening spring 13 to store opening energy.

[0020] In a preferred embodiment, Figure 5 As shown, the closing main rotating shaft 12 is a two-section structure. The two sections of the closing main rotating shaft 12 are compressed by bolts 25. A gasket 26 is arranged between the bolt head and the closing wheel 8. A spring joint 27 is also installed on the closing wheel 8. A closing hanging plate 29 is installed at one end of the closing spring 6. The closing spring 6 is installed on the spring joint 27 through the closing hanging plate 29, and the closing hanging plate 29 is fixed to the spring joint 27 by a locking nut 28. An adjusting screw 30 is installed at the other end of the closing spring 6. A mounting column 31 is arranged on the front panel. The adjusting screw 30 passes through the mounting column 31 to mount the closing spring 6 on the front panel, so that there is a gap between the closing spring 6 and the front panel after the closing spring 6 is installed. The closing spring 6 will not contact the front panel during operation, thereby affecting the performance of the spring operating mechanism; the adjusting screw 30 can adjust the tension of the closing spring 6, and the closing spring 6 can be adjusted according to specific usage conditions to make the system run more stably.

[0021] In a preferred embodiment, the closing wheel 8 is a gear structure, the closing drive unit 5 includes a driving motor 38 and a transmission gear set, the transmission gear set is a four-stage gear set, the transmission gear set is meshed with the closing wheel 8, the driving motor 38 is installed on the upper right side of the front clamping plate 1, the driving motor 38 is connected to the transmission gear set through the output gear, and the closing wheel 8 can be rotated under the action of the driving motor 38 and the transmission gear set, thereby driving the closing spring 6 to stretch and store energy. In other embodiments, the closing wheel 8 may not be a gear structure, the outer contour of the closing wheel 8 is smooth, and a driving gear can be set between the front clamping plate 1 and the rear clamping plate 2, the driving gear is connected to the closing wheel 8 through a rotating shaft, and the driving gear is meshed with the transmission gear set for transmission, and the closing wheel 8 rotates under the action of the driving motor 38, the transmission gear set and the driving gear, thereby stretching the closing spring to store energy. In other embodiments, the transmission gear set can also be a five-stage or six-stage gear set, and is not limited to a four-stage gear set.

[0022] In a preferred embodiment, the closing lock system 7 includes a closing electromagnet 16, a closing catch 17 and a closing bolt 18. The closing roller 19 contacts the closing catch 17 under the drive of the closing wheel 8, so that the closing lock system 7 completes the locking. When the closing action is performed, the closing electromagnet 16 pushes the closing bolt 18 to separate the closing catch 17 and the closing roller 19, so that the closing lock system completes the unlocking. The cooperation of the closing catch 17 and the closing bolt 18 can make the closing lock system 7 simpler in structure, with fewer parts and more stable transmission than the traditional half-shaft release method. In other embodiments, the closing lock system 7 can adopt a transmission half-shaft release method. The technology of the half-shaft release method is more mature, and there is no need to redesign parts. At the same time, it can also achieve the role of ensuring safe power transmission of the power grid system.

[0023] In a preferred embodiment, Figure 4 As shown, the opening lock catch system 3 includes an opening electromagnet 20, an opening first-level catch 21, an opening second-level catch 22 and an opening lock bolt 23. The opening catch 24 cooperates with the opening second-level catch 22. The opening main shaft 10 drives the opening main crank arm 9 to rotate, so that the opening spring 13 stores energy while the opening catch 24 on the opening main crank arm 9 cooperates with the opening second-level catch 22, so that the opening lock catch system 3 completes the lock, and the circuit breaker completes the closing operation. When the opening action is in progress, the opening electromagnet 20 pushes the opening lock bolt 23 to separate the opening first-level catch 21 and the opening second-level catch 22, and then separates the opening second-level catch 22 from the opening catch 24, so that the opening lock catch system completes the unlocking. The structure is simple, and the transmission between the various components of the opening lock catch system 3 is more concise and stable. In other embodiments, the opening lock system 3 may also adopt a traditional half-shaft tripping method. The technology of the half-shaft tripping method is more mature and does not require redesign of components. It can also achieve the function of cutting off the current circuit.

[0024] In a preferred embodiment, a gate-opening buffer 4 is arranged inside the gate-opening spring 13, and the gate-opening buffer 4 is a hydraulic buffer. The gate-opening buffer 4 includes a gate-opening buffer cylinder 34, and a piston rod 35 is arranged inside the gate-opening buffer cylinder 34. The gate-opening spring 13 is sleeved outside the gate-opening buffer cylinder 34. One end of the gate-opening buffer 4 is connected between the front clamping plate 1 and the rear clamping plate 2 through a pin 36, and the other end is connected to the gate-opening main crank arm 9 through a buffer pin 37. The specific working principle of the gate-opening buffer 4 can refer to the gate-opening buffer disclosed in the Chinese invention patent application with application publication number CN115631952A, which has good buffering effect, small space occupation, and more convenient installation and maintenance, making the structure of the spring operating mechanism more compact. In other embodiments, the gate-opening buffer can also be a spring buffer, which realizes the gate-opening buffering effect through a spring.

[0025] In a preferred embodiment, Figure 3 As shown, an energy storage control system is arranged on the outer end face of the rear clamping plate 2, and the energy storage control system includes a micro switch 14 and an energy storage control cam 15. The micro switch 14 is arranged above the rear clamping plate 2, and the energy storage control cam 15 is installed at one end of the closing main shaft 12 extending out of the rear clamping plate 2. The contacts of the micro switch 14 cooperate with the cam profile of the energy storage control cam 15 to effectively disconnect and connect the power supply when the spring operating mechanism is charged with energy storage and the switch is closed, control the connection and disconnection of the drive motor 38, ensure the safe and orderly operation of the transmission system of the spring operating mechanism, and realize simple and efficient control.

[0026] An anti-air closing system 33 is also provided on the outer end surface of the front clamping plate 1. The anti-air closing system 33 is connected to the main rotating shaft 10 of the opening switch through a four-link transmission structure, so that the baffle of the closing lock system 7 blocks the closing lock bolt 18 of the closing lock system 7 to prevent the closing of the closing spring 6 after the energy storage is released. The anti-air closing system 33 locks the closing lock system 7 in the closed state, which can effectively prevent the closing of the closing switch again after closing, and ensure the safe and reliable operation of the spring operating mechanism. An auxiliary switch 32 is also provided on the outer side of the front clamping plate 1. The auxiliary switch 32 is fixed to the front clamping plate 1 by bolts. The auxiliary switch 32 is connected to the main rotating shaft 10 of the opening switch through a four-link structure. The main crank arm 9 of the opening switch drives the four-link action to control the opening and closing of the auxiliary contacts of the auxiliary switch 32, thereby connecting the opening and closing control circuits of the circuit breaker, achieving the purpose of disconnecting or closing the circuit of the circuit breaker, and sending a signal to start the device and the protection locking circuit to ensure the safe and reliable operation of the spring operating mechanism.

[0027] The specific working principle of the spring operating mechanism of the present invention is: Energy storage process: When the drive motor 38 is energized, the closing drive unit 5 drives the closing main shaft 12 to rotate through the transmission gear structure, and the closing wheel 8 rotates to stretch the closing spring 6 until the closing roller 19 on the closing wheel 8 contacts the closing latch 17 of the closing lock system 7 to complete the lock, completing the closing energy storage process.

[0028] Closing process: When the closing electromagnet 16 is energized, the closing electromagnet 16 drives the closing lock 18 to move, and the closing latch 17 is opened under the action of the closing lock 18, and the closing roller 19 on the closing wheel 8 is disengaged from the closing latch 17. The closing main shaft 12 drives the opening main shaft 10 to rotate through the closing cam 11 under the action of the closing spring 6, and the closing cam 11 contacts the cam roller 40 on the opening main crank arm 9 to realize the circuit breaker closing operation. At the same time as the circuit breaker is closed, the opening main crank arm 9 drives the opening spring 13 to move under the action of the closing cam 11, so that the opening spring 13 stores energy, and at the same time, the opening secondary latch 22 of the opening lock system 3 contacts the opening latch 24 on the opening main crank arm 9 to complete the locking.

[0029] Opening process: When the opening electromagnet 20 is energized, the opening electromagnet 20 drives the opening lock bolt 23 to move, and the first-level opening latch 21 is disengaged from the opening lock bolt 23 under the action of the driving force, and the first-level opening latch 21 is disengaged from the second-level opening latch 22, and the entire opening lock system 3 is opened. The energy release of the opening spring 13 drives the opening main crank arm 9 on the opening main rotating shaft 10 to move, thereby realizing the circuit breaker opening operation. At the same time, the opening buffer 4 absorbs excess energy to complete the opening process.

[0030] At the end of the closing process and at the end of the closing process, the opening brake catch 24 on the main opening brake arm 9 cooperates with the opening brake secondary catch 22, and at the same time, the opening brake primary catch 21 is tangent to the opening brake secondary roller on the opening brake secondary catch 22, and the roller on the opening brake primary catch 21 is tangent to the opening brake lock bolt 23. At this time, the opening brake lock buckle system 3 completes the lock, and the closing process is in a holding state. When the opening brake electromagnet 20 receives the opening brake command, the opening brake electromagnet 20 pushes the opening brake lock bolt 23 to operate, the opening brake primary catch 21 and the opening brake secondary catch 22 are disengaged under the action of the driving force, the opening brake catch 24 on the main opening brake arm 9 is disengaged, and the opening brake main turning arm 9 performs the opening brake action under the action of the opening brake spring 13. The entire opening brake lock buckle system 3 operates in sequence, which can effectively prevent misoperation and make the system more reliable and stable.

[0031] 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. A spring operating mechanism, characterized in that: The invention comprises a frame, on which a closing energy storage system, a closing lock system, an opening energy storage system and an opening lock system are installed. The closing energy storage system comprises a closing main rotating shaft, on which a closing wheel is installed. A closing spring is connected between the closing wheel and the frame, and the connection position between the closing spring and the closing wheel is eccentrically arranged. A closing roller for cooperating with the closing lock system is arranged on the closing wheel. The closing energy storage system also comprises a device for driving the closing main rotating shaft to rotate so as to close the closing wheel. The closing drive unit is used for pulling the closing spring by the rotating wheel to store energy for closing; the opening energy storage system includes an opening main rotating shaft, on which a opening main crank arm is installed, an opening spring is connected between the opening main crank arm and the frame, and an opening latch for cooperating with the opening locking system is provided on the opening main crank arm; a closing cam is provided on the closing main rotating shaft, and when the closing action is in progress, the closing cam rotates and drives the opening main crank arm to rotate through its cam profile and pulls the opening spring to store energy for opening.

2. The spring operating mechanism according to claim 1, characterized in that: The frame includes front and rear clamping plates arranged at a relative interval, the closing main shaft passes through the front and rear clamping plates respectively and is rotatably assembled with the front and rear clamping plates, the closing wheel, the closing spring and the closing lock system are all arranged on the front side of the front clamping plate, and the closing cam, the opening energy storage system and the opening lock system are all arranged in the space between the front and rear clamping plates.

3. The spring operating mechanism according to claim 1 or 2, characterized in that: The closing wheel is a gear structure, and the closing drive unit includes a drive motor and a transmission gear set, and the transmission gear set is meshed with the closing wheel for transmission.

4. The spring operating mechanism according to claim 3, characterized in that: The drive motor is installed on the front side of the front clamping plate, and the output end extends between the front and rear clamping plates and is connected to the transmission gear set. The output end of the transmission gear set is arranged on the front side of the front clamping plate and meshes with the closing wheel.

5. The spring operating mechanism according to claim 1 or 2, characterized in that: The closing lock system includes a closing electromagnet, a closing catch and a closing bolt. The closing catch cooperates with the closing roller to realize the closing lock system to complete the locking. When the closing action is performed, the closing electromagnet pushes the closing bolt to separate the closing catch and the closing roller, so that the closing lock system completes the unlocking.

6. The spring operating mechanism according to claim 1 or 2, characterized in that: The opening brake locking system includes an opening brake electromagnet, a first-level opening brake catch and a second-level opening brake catch. When the main crank arm rotates under the action of the closing cam, the second-level opening brake catch contacts the opening brake catch on the main crank arm to complete the locking of the opening brake locking system. When the opening brake action is in progress, the opening brake electromagnet pushes the opening brake lock bolt to separate the first-level opening brake catch and the second-level opening brake catch, and then separates the second-level opening brake catch from the opening brake catch, so that the opening brake locking system is unlocked.

7. The spring operating mechanism according to claim 1 or 2, characterized in that: A brake opening buffer is arranged inside the brake opening spring.

8. The spring operating mechanism according to claim 7, characterized in that: The opening brake buffer is a hydraulic buffer.

9. The spring operating mechanism according to claim 2, characterized in that: An energy storage control system is arranged on the outer side surface of the rear splint, and the energy storage control system includes a micro switch and an energy storage control cam. The energy storage control cam is installed on one end of the rear splint where the closing main shaft extends out. The contacts of the micro switch cooperate with the cam profile of the energy storage control cam to realize the start and stop control of the drive motor.

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