Hydraulic spring operating mechanism for circuit breaker

Abstract

This invention belongs to the technical field of high-voltage switchgear, and particularly relates to a hydraulic spring operating mechanism for circuit breakers. It includes a main cylinder, a solenoid valve assembly, an energy storage motor, an energy storage cylinder body, a disc spring assembly, an energy storage piston, a piston rod, a hollow tube, an expansion scraping mechanism, a Tesla valve-type damping mechanism, a hydraulic assist mechanism, and a buffer mechanism. The upper part of the main cylinder is connected to the solenoid valve assembly, the energy storage motor, and the energy storage cylinder body. The lower part of the main cylinder is fitted with a disc spring assembly, and the top of the disc spring assembly is fixedly connected to the energy storage piston, which is slidably disposed inside the energy storage cylinder body. This invention correlates the forward low-resistance and reverse high-resistance characteristics of the Tesla valve-type damping mechanism with the movement direction of the piston rod. When the piston rod moves in a certain direction, high damping pressure is generated in that direction. This pressure is automatically and in real-time transmitted to the expansion scraping mechanism on the same side via the hydraulic assist mechanism, causing the elastic scraper ring to expand radially and tightly adhere to the inner wall of the high-voltage working chamber.

Description

Technical Field

[0001] This invention belongs to the technical field of high-voltage switchgear, and particularly relates to a hydraulic spring operating mechanism for circuit breakers. Background Technology

[0002] Hydraulic spring operating mechanisms are widely used in high-voltage and ultra-high-voltage circuit breakers due to their advantages such as high output power, fast operating speed, and compact structure. They serve as the core power component driving the moving contacts of the circuit breaker to perform opening and closing operations. A typical hydraulic spring operating mechanism includes a main cylinder, solenoid valve assembly, energy storage motor, energy storage cylinder, disc spring assembly, and working piston rod. Its working principle involves the energy storage motor driving an oil pump to inject high-pressure oil into the energy storage cylinder to compress the disc spring assembly for energy storage. Upon receiving an opening or closing command, the solenoid valve assembly activates, controlling the on / off state and flow direction of the high-pressure oil, thereby driving the piston rod to move at high speed within the high-pressure working chamber, ultimately actuating the moving contacts of the circuit breaker to achieve rapid opening and closing.

[0003] With the increasing demands of power systems for circuit breaker reliability, operational life, and maintenance-free cycles, existing hydraulic spring operating mechanisms still exhibit the following technical problems in practical applications: 1. During long-term operation, the hydraulic oil in the high-pressure working chamber will inevitably produce adhesive impurities such as sludge, oxides, and metal abrasive particles. These impurities will gradually adhere to the inner wall of the working chamber. When the piston rod moves at high speed with the piston rings, these hard or sticky deposits will come into direct contact with the piston rings, causing severe abrasive wear or scratches on the piston rings and the inner wall of the cylinder.

[0004] 2. During the opening or closing operation of the circuit breaker operating mechanism, the piston rod and the connected moving contact have significant mass and high speed. When the piston rod reaches the end of its stroke, without effective cushioning, a violent rigid impact will occur. This impact not only generates high-decibel noise, but more importantly, it accelerates fatigue damage to the bottom of the main cylinder, the end face of the piston rod, and related connecting parts, reducing the mechanical life and operational reliability of the mechanism, and may even lead to serious accidents such as component breakage. Summary of the Invention

[0005] In order to overcome the shortcomings of the working chamber inner wall being prone to adhering impurities leading to abrasive wear, and the lack of buffering at the end of the stroke leading to rigid impact, the present invention provides a hydraulic spring operating mechanism for circuit breakers that can achieve cleaning of the working chamber inner wall and buffering at the end of the stroke.

[0006] The technical solution is as follows: A hydraulic spring operating mechanism for a circuit breaker includes a main cylinder, a solenoid valve group, an energy storage motor, an energy storage cylinder body, a disc spring group, an energy storage piston, a piston rod, a hollow tube, an expansion scraping mechanism, a Tesla valve damping mechanism, a hydraulic assist mechanism, and a buffer mechanism. The upper part of the main cylinder is connected to the solenoid valve group, the energy storage motor, and the energy storage cylinder body. The lower part of the main cylinder is fitted with a disc spring group, and the top of the disc spring group is fixedly connected to the energy storage piston. The energy storage piston is slidably disposed inside the energy storage cylinder body. A high-pressure working chamber is opened inside the main cylinder, and a piston rod is movably disposed in the high-pressure working chamber. The upper end of the piston rod extends out of the top of the main cylinder, and the lower end of the piston rod is connected to a hollow tube. An expansion scraping mechanism is provided on the outside of both the piston rod and the hollow tube. Each expansion scraping mechanism is connected to a Tesla valve damping mechanism on the side opposite to the other group through a hydraulic assist mechanism. A buffer mechanism is also provided at the bottom of the lower Tesla valve damping mechanism to buffer and decelerate when the piston rod moves downward to the end of its stroke.

[0007] Preferably, the expansion scraping mechanism includes a connecting rod, a support ring, an air bladder, and an elastic scraping ring. The piston rod and the hollow tube are both connected to the connecting rod. The outer end of the connecting rod is connected to the support ring. The outer side of the support ring is connected to the annular air bladder. The outer side of the air bladder is connected to the elastic scraping ring. The elastic scraping ring maintains a gap with the inner wall of the high-pressure working chamber and does not contact it.

[0008] Preferably, the Tesla valve damping mechanism includes an annular block, with annular blocks slidably provided on both the outer side of the piston rod and the outer side of the hollow tube. Tesla flow channels are opened on the annular blocks. The Tesla flow channels on the annular blocks fitted on the outer side of the piston rod are configured to have low resistance when the piston rod moves downward and high resistance when it moves upward. The Tesla flow channels on the annular blocks fitted on the outer side of the hollow tube are configured to have high resistance when the piston rod moves downward and low resistance when it moves upward.

[0009] Preferably, the hydraulic power assist mechanism includes a small cylinder, a connecting pipe, a small piston, and a first return spring. The small cylinder is connected to the connecting rod, and the small piston is slidably and sealed inside the small cylinder. One end of the small piston extends out of the small cylinder and is connected to an annular block on the same side. The small cylinder is filled with hydraulic oil. The connecting pipe is connected to the side of the small cylinder away from the annular block, and the other end of the connecting pipe is connected to the inside of the air bladder. The first return spring is connected between the small cylinder and the annular block.

[0010] Preferably, the buffer mechanism includes a guide rod, a sealing plate, a second return spring, and a pressing assembly. A clearance hole is provided on the hollow tube. The lower part of the lower annular block is slidably connected to the guide rod, and the end of the guide rod is connected to the sealing plate. Both the sealing plate and the guide rod pass through the clearance hole. The annular block is slidably connected to the sealing plate. The sealing plate is used to open and close the Tesla flow channel of the lower annular block. The two ends of the second return spring are respectively connected to the sealing plate and the annular block. The lower end of the hollow tube is provided with a pressing assembly for pressing the sealing plate.

[0011] Preferably, the top pressure assembly includes a trigger block, a trigger rod, a trigger cone, and a third reset spring. The trigger block is installed at the bottom of the high-pressure working chamber. The trigger rod is slidably connected to the lower end of the hollow tube. The trigger cone is connected to the upper end of the trigger rod. The inclined surface of the trigger cone contacts the sealing plate. The two ends of the third reset spring are respectively connected to the trigger rod and the hollow tube.

[0012] Preferably, a contact wheel is also included, with the sealing plate having a contact wheel installed at one end near the trigger cone.

[0013] Preferably, an elastic retaining ring is also included, with an elastic retaining ring connecting the upper elastic scraper ring to the piston top of the piston rod.

[0014] Preferably, an elastic protective cover is also included, which is located outside the main cylinder and covers the disc spring assembly.

[0015] The beneficial effects of this invention are: 1. This invention correlates the low-resistance forward and high-resistance reverse characteristics of the Tesla valve-type damping mechanism with the movement direction of the piston rod. When the piston rod moves in a certain direction, high damping pressure is generated in that direction. This pressure is automatically and in real-time transmitted to the expansion scraping mechanism on the same side via a hydraulic assist mechanism, causing the elastic scraper ring to expand radially and tightly adhere to the inner wall of the high-pressure working chamber. The expansion scraping mechanism moves synchronously with the piston rod, enabling it to thoroughly scrape away sludge, impurities, metal shavings, and other adhering substances on the inner wall before the piston ring arrives. This design solves the problem of piston ring and cylinder wear caused by contamination of the inner wall of the working chamber, significantly extending the service life of the sealing system.

[0016] 2. This invention incorporates a unique buffer mechanism at the bottom of the Tesla valve-type damping mechanism. During normal piston rod movement, the Tesla flow channel in the lower annular block remains unobstructed, resulting in low damping pressure. As the piston rod approaches the end of its stroke, the trigger rod contacts the trigger block. Through the precise cooperation between the trigger cone and the sealing plate, the effective flow area of ​​the Tesla flow channel gradually decreases according to the piston rod's position, thereby generating a progressively increasing hydraulic damping force at the end of the stroke. This makes the piston rod's deceleration process smooth and linear, avoiding the severe impacts caused by traditional rigid limits or simple throttling orifices. It effectively absorbs the enormous kinetic energy of the moving parts, not only eliminating the rigid impact between the piston rod and the cylinder bottom and reducing operational noise, but also protecting all critical components inside the operating mechanism from impact fatigue damage, significantly improving the mechanical life and overall reliability of the mechanism.

[0017] 3. This invention, by setting an elastic retaining ring between the upper elastic scraper ring and the piston top, can reliably collect the impurities scraped off from above in a specific space, preventing them from contaminating other working areas downwards. Simultaneously, an elastic protective cover is installed on the lower outer side of the main cylinder, effectively protecting the disc spring assembly from external dust, moisture, and impurities, thus providing rust prevention and protection, and extending the service life of the disc springs. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0019] Figure 2 This is a cross-sectional structural diagram of the present invention.

[0020] Figure 3 This is a schematic diagram of the expansion scraping mechanism, Tesla valve damping mechanism, and hydraulic assist mechanism of the present invention.

[0021] Figure 4 This is a cross-sectional structural schematic diagram of the Tesla valve damping mechanism of the present invention.

[0022] Figure 5 This is a three-dimensional structural diagram of the expansion scraping mechanism of the present invention.

[0023] Figure 6 This is a three-dimensional structural diagram of the buffer mechanism of the present invention.

[0024] Figure 7 This is a three-dimensional structural diagram of the hydraulic power assist mechanism of the present invention.

[0025] Figure 8 This is a top view of the buffer mechanism of the present invention.

[0026] The markings in the attached diagram are: 1-Main hydraulic cylinder, 2-Solenoid valve assembly, 3-Storage motor, 4-Storage cylinder body, 5-Disc spring assembly, 6-Storage piston, 7-High-pressure working chamber, 8-Piston rod, 9-Hollow tube, 91-Allowing hole, 10-Expansion scraping mechanism, 101-Connecting rod, 102-Support ring, 103-Airbag, 104-Elastic scraper ring, 11-Tesla valve-type damping mechanism, 111-Annular block, 112-Tesla flow channel, 12 - Hydraulic power assist mechanism, 121- Small cylinder, 122- Connecting pipe, 123- Small piston, 124- First return spring, 13- Buffer mechanism, 131- Guide rod, 132- Sealing plate, 133- Second return spring, 134- Top pressure assembly, 1341- Trigger block, 1342- Trigger rod, 1343- Trigger cone, 1344- Third return spring, 135- Contact wheel, 14- Elastic retaining ring, 15- Elastic protective cover. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] Example 1: A hydraulic spring operating mechanism for a circuit breaker, such as Figures 1-8 As shown, the system includes a main hydraulic cylinder 1, a solenoid valve assembly 2, a storage motor 3, a storage cylinder body 4, a disc spring assembly 5, a storage piston 6, a piston rod 8, a hollow tube 9, an expansion scraping mechanism 10, a Tesla valve-type damping mechanism 11, a hydraulic assist mechanism 12, and a buffer mechanism 13. The upper left side of the main hydraulic cylinder 1 is connected to the solenoid valve assembly 2 via a flange to control the flow of high-pressure oil. The storage motor 3 is mounted on the upper front side of the main hydraulic cylinder 1. The output end of the storage motor 3 is connected to an oil pump (not shown in the figure). The oil pump's inlet is connected to an oil tank, and its outlet is connected to the oil inlet of the storage cylinder body 4, used to transfer hydraulic pressure to the storage cylinder body 4. Oil is pumped into the energy storage cylinder 4 to store energy by compressing the disc spring assembly 5. The energy storage cylinder 4 is integrally connected to the upper right side of the main cylinder 1. The disc spring assembly 5 is sleeved on the lower outer side of the main cylinder 1. The top of the disc spring assembly 5 is fixedly connected to the energy storage piston 6. The upper end of the energy storage piston 6 is slidably and sealingly disposed inside the energy storage cylinder 4. A high-voltage working chamber 7 is opened in the center of the main cylinder 1 along the axial direction. A longitudinally extending piston rod 8 is movably disposed in the high-voltage working chamber 7. The upper end of the piston rod 8 extends out of the top of the main cylinder 1 and is used to connect to the moving contact connecting rod of the circuit breaker body. The lower end of the piston rod 8 is integrally formed. A hollow tube 9 is connected to the piston rod 8. The outer diameter of the hollow tube 9 is smaller than the outer diameter of the piston rod 8. An expansion scraping mechanism 10 is provided on the outer side of the piston rod 8 and the outer side of the hollow tube 9. Each expansion scraping mechanism 10 faces away from the other and is connected to a Tesla valve damping mechanism 11 via a hydraulic assist mechanism 12. When the piston rod 8 moves up and down within the high-pressure working chamber 7, the Tesla valve damping mechanism 11 utilizes its low resistance in the forward direction and high resistance in the reverse direction to transmit the oil pressure in the direction of movement to the expansion scraping mechanism 10 via the hydraulic assist mechanism 12, causing it to expand radially and engage with the high-pressure working chamber. The inner wall of the high-pressure working chamber 7 remains in contact. The expansion scraping mechanism 10, the hydraulic assist mechanism 12, and the Tesla valve damping mechanism 11 move synchronously with the piston rod 8. Before the piston ring of the piston rod 8 arrives, the expansion scraping mechanism 10 scrapes the adhering material on the inner wall of the high-pressure working chamber 7 cleans it in advance, thereby avoiding direct contact between the piston ring and the adhering material, which would cause wear. The bottom of the Tesla valve damping mechanism 11 is also equipped with a buffer mechanism 13, which is used to buffer and decelerate when the piston rod 8 moves downward to the end of its stroke, so as to avoid rigid impact between the piston rod 8 and the bottom of the main cylinder 1, thereby protecting the internal parts of the operating mechanism and reducing the noise of the operation.

[0029] Solenoid valve assembly 2 controls the on / off state of high-pressure oil, thereby determining the direction of movement of piston rod 8. Energy storage motor 3 drives oil pump to provide initial energy to the system, causing the pump to inject oil into energy storage cylinder 4, which in turn compresses disc spring assembly 5, achieving energy storage. During the closing or opening process, piston rod 8 moves up and down within high-pressure working chamber 7. At this time, Tesla valve damping mechanism 11 utilizes its low resistance in the forward direction and high resistance in the reverse direction to transmit the oil pressure in the direction of movement through hydraulic assist mechanism 12 to the expansion scraping mechanism 10 on the same side, causing the expansion scraping mechanism 10 to expand radially and tightly adhere to the inner wall of high-pressure working chamber 7. The expansion scraping mechanism 10, hydraulic assist mechanism 12, and Tesla valve damping mechanism 11 move synchronously with piston rod 8, and before the piston rings arrive, they pre-scrape away any adhering material on the inner wall, thus preventing the piston rings from directly contacting the adhering material and causing wear. Furthermore, a buffer mechanism 13 is also provided at the bottom of the lower Tesla valve damping mechanism 11. When the piston rod 8 moves downward to the end of its stroke, the buffer mechanism 13 activates to buffer and decelerate the piston rod 8, preventing the piston rod 8 from rigidly impacting the bottom of the main cylinder 1, thereby protecting the internal parts of the operating mechanism and reducing operating noise.

[0030] Example 2: Based on Example 1, such as Figures 3-5 As shown, the expansion scraping mechanism 10 includes a connecting rod 101, a support ring 102, an air bladder 103, and an elastic scraper ring 104. Four connecting rods 101 are fixedly connected to the outer side of the lower part of the piston rod 8 and the outer side of the hollow tube 9, and the outer ends of the four connecting rods 101 on the same side are connected to a support ring 102. An annular air bladder 103 is connected to the outer side of the support ring 102, and an elastic scraper ring 104 is connected to the outer side of the air bladder 103. The elastic scraper ring 104 is made of wear-resistant rubber and has a sharp scraping edge. When the air bladder 103 is not inflated, the elastic scraper ring 104 maintains a gap with the inner wall of the high-pressure working chamber 7 and does not contact it. When the air bladder 103 is filled with pressurized oil, the air bladder 103 expands radially and pushes the elastic scraper ring 104 outward and evenly, so that the outer edge of the elastic scraper ring 104 is tightly attached to the inner wall of the high-pressure working chamber 7, thereby scraping off the impurities or oil stains attached to the inner wall when it moves with the piston rod 8.

[0031] like Figures 3-4As shown, the Tesla valve damping mechanism 11 includes an annular block 111. Annular blocks 111 are slidably provided on the lower outer side of the piston rod 8 and the outer side of the hollow tube 9. The inner wall of the annular block 111 is in sliding sealing fit with the corresponding outer wall of the piston rod 8 or the hollow tube 9. A radial gap is left between the outer wall of the annular block 111 and the inner wall of the high-pressure working chamber 7. Each annular block 111 has eight Tesla flow channels 112 evenly spaced circumferentially. These Tesla flow channels 112 have unidirectional fluid characteristics of low flow resistance in the forward direction and high flow resistance in the reverse direction. The Tesla flow channels on the annular block 111 sleeved on the outer side of the piston rod 8... 112 is configured to have low resistance when the piston rod 8 moves downward and high resistance when it moves upward; the Tesla flow channel 112 on the annular block 111 sleeved on the outside of the hollow tube 9 is configured to have high resistance when the piston rod 8 moves downward and low resistance when it moves upward. When the piston rod 8 moves up and down in the high-pressure working chamber 7, the upper and lower annular blocks 111 produce different damping effects on the oil according to the direction of movement, thereby transmitting the oil pressure in the corresponding direction to the expansion scraping mechanism 10 on the same side through the hydraulic assist mechanism 12, so that the expansion scraping mechanism 10 expands in advance and scrapes off the inner wall deposits before the piston ring of the piston rod 8 arrives.

[0032] like Figure 3 , Figure 6 and Figure 7 As shown, the hydraulic power assist mechanism 12 includes a small cylinder 121, a connecting pipe 122, a small piston 123, and a first return spring 124. Each connecting rod 101 is fixedly connected to a small cylinder 121. A small piston 123 is slidably disposed within the small cylinder 121. One end of the small piston 123 extends out of the small cylinder 121 and is fixedly connected to an annular block 111 on the same side. This allows the annular block 111 to drive the small piston 123 to reciprocate within the small cylinder 121 when it moves up and down. The small cylinder 121 is filled with hydraulic oil. A connecting pipe 122 is connected to the side of the small cylinder 121 away from the annular block 111. The other end of the connecting pipe 122 passes through the support ring 102 and communicates with the interior of the air bladder 103. A first return spring 124 is connected between piston 121 and annular block 111. The first return spring 124 is sleeved on the outside of small piston 123 and is used to reset annular block 111 when it is not subjected to external force. When piston rod 8 moves, Tesla valve damping mechanism 11 in the corresponding direction generates damping pressure, pushing annular block 111 to move. Annular block 111 drives small piston 123 to slide into small cylinder 121, squeezing the oil in the cylinder. The oil enters air bladder 103 through connecting pipe 122, causing it to expand radially, thereby driving elastic scraper ring 104 to stick to the inner wall of high pressure working chamber 7. When the movement direction is reversed, the first return spring 124 pushes annular block 111 to reset, air bladder 103 contracts, and elastic scraper ring 104 disengages from contact with the inner wall.

[0033] When the piston rod 8 moves upward or downward within the high-pressure working chamber 7, the Tesla channels 112 on the upper and lower annular blocks 111, due to their opposite orientation, produce different damping effects on the hydraulic fluid. Specifically: the Tesla channels 112 of the annular block 111 fitted outside the piston rod 8 are configured to have low resistance when moving downward and high resistance when moving upward; the annular block 111 fitted outside the hollow tube 9 is configured to have high resistance when moving downward and low resistance when moving upward. Therefore, when the piston rod 8 moves upward, the upper annular block 111 experiences high damping pressure, and when the piston rod 8 moves downward, the lower annular block 111 experiences high damping pressure. This pressure pushes the annular block 111 to drive the small piston 123 connected to it to slide into the small cylinder 121, compressing the hydraulic fluid inside the small cylinder 121. The compressed hydraulic fluid enters the air bladder 103 on the same side through the connecting pipe 122, causing the air bladder 103 to expand radially. After the airbag 103 inflates, it pushes the elastic scraper ring 104 outwards evenly, ensuring that the sharp scraping edge of its outer edge fits tightly against the inner wall of the high-pressure working chamber 7. Since the entire expansion and scraping mechanism 10 moves synchronously with the piston rod 8, the elastic scraper ring 104 pre-scrapes away impurities or oil stains from the inner wall before the piston ring of the piston rod 8 arrives, thus preventing the piston ring from directly contacting the deposits and causing wear. When the piston rod 8 moves in the opposite direction, the damping pressure on that side disappears, the first return spring 124 pushes the annular block 111 to reset, the small piston 123 slides outwards, and the oil flows from the airbag 103 back to the small cylinder 121 through the connecting pipe 122. The airbag 103 contracts, and the elastic scraper ring 104 disengages from the inner wall, reducing unnecessary friction. Thus, during the closing or opening process, the expansion and scraping mechanism 10 on the corresponding side is automatically activated according to the direction of movement, achieving efficient and adaptive inner wall cleaning and protection.

[0034] Example 3: Based on Example 2, such as Figure 4 , Figure 6 and Figure 8 As shown, the buffer mechanism 13 includes a guide rod 131, a sealing plate 132, a second return spring 133, and a pressing assembly 134. The hollow tube 9 has eight clearance holes 91 evenly spaced around its circumference. Eight guide rods 131 are slidably connected to the inner side of the lower annular block 111. Each guide rod 131 has a sealing plate 132 connected to its end. The sealing plate 132 and the guide rod 131 both pass through the clearance holes 91. The lower end of the annular block 111 has a radially open through groove that communicates with the Tesla flow channel 112. The sealing plate 132 is slidably connected in the through groove and is used to open and close the Tesla flow channel 112 of the lower annular block 111. The guide rod 131 is sleeved with a second return spring 133. The two ends of the second return spring 133 are respectively connected to the sealing plate 132 and the inner wall of the annular block 111. The lower end of the hollow tube 9 is movably provided with a pressing assembly 134 for pressing the sealing plate 132.

[0035] like Figure 2 , Figure 4 and Figure 6 As shown, the top-pressure assembly 134 includes a trigger block 1341, a trigger rod 1342, a trigger cone 1343, and a third reset spring 1344. The trigger block 1341 is installed in the middle of the bottom of the high-pressure working chamber 7. The trigger rod 1342 is slidably connected to the lower end of the hollow tube 9. The lower end of the trigger rod 1342 is designed as a pointed tip to reduce oil resistance during downward movement and prevent premature upward movement of the trigger rod 1342 due to oil pressure. The upper end of the trigger rod 1342 is connected to the trigger cone 1343, which has a conical structure. Its inclined surface meets the end of the sealing plate 132. The upper part of the trigger rod 1342 is fitted with a third return spring 1344. The lower end of the third return spring 1344 is connected to the trigger rod 1342, and the upper end is connected to the bottom of the hollow tube 9. When the piston rod 8 drives the hollow tube 9 to move downward to the end of the stroke, the lower end of the trigger rod 1342 contacts the trigger block 1341, and the trigger rod 1342 and the trigger cone 1343 stop moving downward. Meanwhile, the hollow tube 9 continues to move downward a short distance, so that the inclined surface of the trigger cone 1343 pushes the sealing plate 132 upward relative to each other, thereby gradually closing the Tesla flow channel 112 and achieving a buffering effect at the end of the stroke.

[0036] like Figure 6 and Figure 8 As shown, it also includes a contact wheel 135. The end of the sealing plate 132 near the trigger cone 1343 is equipped with a contact wheel 135 via a bearing. The contact wheel 135 maintains rolling contact with the inclined surface of the trigger cone 1343 to reduce friction loss and improve the smoothness of the operation.

[0037] During normal downward movement, the Tesla flow channel 112 of the lower annular block 111 is open, allowing oil to flow through with minimal damping. When the piston rod 8 drives the hollow tube 9 downwards near the end of its stroke, the lower end of the trigger rod 1342 contacts the trigger block 1341, stopping the trigger rod 1342 and trigger cone 1343 from moving downwards, while the hollow tube 9 continues to move downwards with the piston rod 8 for a short distance. At this point, because the trigger cone 1343 is stationary while the hollow tube 9 continues to descend, the inclined surface of the trigger cone 1343 pushes the sealing plate 132 upwards. After being pushed, the sealing plate 132 slides inwards along the through groove, gradually closing the passage connected to the Tesla flow channel 112. As the Tesla flow channel 112 is gradually closed, the cross-sectional area for oil flow decreases, and the damping pressure gradually increases, producing a gentle deceleration effect on the piston rod 8. The guide rod 131 guides the sliding of the sealing plate 132. The two ends of the second return spring 133 are connected to the inner walls of the sealing plate 132 and the annular block 111, respectively, and are compressed during the buffering process. When the piston rod 8 begins to return upwards, the lower end of the trigger rod 1342 disengages from the trigger block 1341. The elastic force of the third return spring 1344 causes the trigger rod 1342 and the trigger cone 1343 to return downwards. Simultaneously, the second return spring 133 pushes the sealing plate 132 to slide outwards, reopening the Tesla flow channel 112 and restoring normal damping, preparing for the next action. Thus, the buffer mechanism 13 can achieve progressive buffering at the end of the stroke, effectively protecting the internal parts of the operating mechanism and reducing operational noise.

[0038] Example 4: Based on Example 3, such as Figure 4 As shown, it also includes an elastic retaining ring 14. An elastic retaining ring 14 is connected between the bottom of the upper elastic scraper ring 104 and the top of the piston of the piston rod 8. The impurities or oil stains scraped off by the upper elastic scraper ring 104 fall into the space enclosed between the top of the piston and the elastic retaining ring 14, which is convenient for collection and avoids the impurities from contaminating downwards. The impurities scraped off by the lower elastic scraper ring 104 fall directly to the bottom of the high-pressure working chamber 7.

[0039] like Figures 1-2 As shown, it also includes an elastic protective cover 15, which is located on the lower outer side of the main body cylinder 1 and covers the disc spring assembly 5. It is used to prevent external dust and impurities from entering the disc spring assembly 5, and at the same time plays a certain role in rust prevention and protection.

[0040] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A hydraulic spring operating mechanism for circuit breaker, comprising a main body oil cylinder (1), a solenoid valve group (2), an energy storage motor (3), an energy storage cylinder body (4), a disc spring group (5), an energy storage piston (6), a piston rod (8), a hollow tube (9), characterized in that: It also includes an expansion scraping mechanism (10), a Tesla valve damping mechanism (11), a hydraulic assist mechanism (12), and a buffer mechanism (13). The upper part of the main cylinder (1) is connected to a solenoid valve assembly (2), an energy storage motor (3), and an energy storage cylinder body (4). The lower part of the main cylinder (1) is fitted with a disc spring assembly (5). The top of the disc spring assembly (5) is fixedly connected to an energy storage piston (6). The energy storage piston (6) is slidably disposed inside the energy storage cylinder body (4). The interior of the main cylinder (1) is provided with a high-pressure working chamber (7). A piston is movably disposed in the high-pressure working chamber (7). The upper end of the piston rod (8) extends out of the top of the main cylinder (1), and the lower end of the piston rod (8) is connected to a hollow tube (9). Both the piston rod (8) and the hollow tube (9) are provided with expansion scraping mechanisms (10). Each set of expansion scraping mechanisms (10) is on the side facing away from the other set. Each set is connected to a Tesla valve damping mechanism (11) through a hydraulic assist mechanism (12). The bottom of the Tesla valve damping mechanism (11) is also provided with a buffer mechanism (13) for buffering and decelerating when the piston rod (8) moves downward to the end of the stroke.

2. A hydraulic spring operating mechanism for a circuit breaker according to claim 1, characterized in that, The expansion scraping mechanism (10) includes a connecting rod (101), a support ring (102), an air bladder (103), and an elastic scraping ring (104). The piston rod (8) and the hollow tube (9) are both connected to the connecting rod (101). The outer end of the connecting rod (101) is connected to the support ring (102). The outer side of the support ring (102) is connected to the annular air bladder (103). The outer side of the air bladder (103) is connected to the elastic scraping ring (104). The elastic scraping ring (104) maintains a gap with the inner wall of the high-pressure working chamber (7) without contacting it.

3. A hydraulic spring operating mechanism for a circuit breaker according to claim 2, characterized in that, The Tesla valve damping mechanism (11) includes an annular block (111). The annular block (111) is slidably provided on the outer side of the piston rod (8) and the outer side of the hollow tube (9). A Tesla flow channel (112) is provided on the annular block (111). The Tesla flow channel (112) on the annular block (111) sleeved on the outer side of the piston rod (8) is configured to have low resistance when the piston rod (8) moves downward and high resistance when it moves upward. The Tesla flow channel (112) on the annular block (111) sleeved on the outer side of the hollow tube (9) is configured to have high resistance when the piston rod (8) moves downward and low resistance when it moves upward.

4. A hydraulic spring operating mechanism for a circuit breaker according to claim 3, characterized in that, The hydraulic power assist mechanism (12) includes a small cylinder (121), a connecting pipe (122), a small piston (123), and a first return spring (124). The small cylinder (121) is connected to the connecting rod (101). The small piston (123) is sealed and slidably arranged inside the small cylinder (121). One end of the small piston (123) extends out of the small cylinder (121) and is connected to the annular block (111) on the same side. The small cylinder (121) is filled with hydraulic oil. The side of the small cylinder (121) away from the annular block (111) is connected to the connecting pipe (122). The other end of the connecting pipe (122) is connected to the inside of the airbag (103). The first return spring (124) is connected between the small cylinder (121) and the annular block (111).

5. A hydraulic spring operating mechanism for a circuit breaker according to claim 4, characterized in that, The buffer mechanism (13) includes a guide rod (131), a sealing plate (132), a second return spring (133), and a top pressure assembly (134). A clearance hole (91) is provided on the hollow tube (9). The lower part of the lower annular block (111) is slidably connected to the guide rod (131). The end of the guide rod (131) is connected to the sealing plate (132). The sealing plate (132) and the guide rod (131) both pass through the clearance hole (91). The annular block (111) and the sealing plate (132) are slidably connected. The sealing plate (132) is used to open and close the Tesla flow channel (112) of the lower annular block (111). The two ends of the second return spring (133) are respectively connected to the sealing plate (132) and the annular block (111). The lower end of the hollow tube (9) is provided with a top pressure assembly (134) for pressing the sealing plate (132).

6. A hydraulic spring operating mechanism for a circuit breaker according to claim 5, characterized in that, The top pressure assembly (134) includes a trigger block (1341), a trigger rod (1342), a trigger cone (1343), and a third reset spring (1344). The trigger block (1341) is installed at the bottom of the high-pressure working chamber (7). The trigger rod (1342) is slidably connected to the lower end of the hollow tube (9). The trigger cone (1343) is connected to the upper end of the trigger rod (1342). The inclined surface of the trigger cone (1343) contacts the sealing plate (132). The two ends of the third reset spring (1344) are respectively connected to the trigger rod (1342) and the hollow tube (9).

7. A hydraulic spring operating mechanism for a circuit breaker according to claim 6, characterized in that, It also includes a contact wheel (135), which is installed on one end of the sealing plate (132) near the trigger cone (1343).

8. A hydraulic spring operating mechanism for a circuit breaker according to claim 2, characterized in that, It also includes an elastic retaining ring (14), which is connected between the upper elastic scraper ring (104) and the piston top of the piston rod (8).

9. A hydraulic spring operating mechanism for a circuit breaker according to claim 1, characterized in that, It also includes an elastic protective cover (15), which is located outside the main cylinder (1) and covers the disc spring assembly (5).

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