Intelligent pole-mounted circuit breaker

Abstract

The invention relates to the technical field of pole-mounted circuit breakers, in particular to an intelligent pole-mounted circuit breaker which comprises a vacuum arc extinguishing mechanism, the vacuum arc extinguishing mechanism comprises an airtight insulation shell, an arc extinguishing chamber, a buffer chamber, a movable chamber, a static contact, a movable contact, a tower-shaped spring and a buffer column, and the arc extinguishing chamber, the buffer chamber and the movable chamber are arranged in the airtight insulation shell from top to bottom. The static contact and the moving contact are arranged in the arc extinguish chamber, the tower-shaped spring is installed at the top end of the buffer chamber, and the buffer column is arranged in the buffer chamber. The second lifting shaft and the buffer column move synchronously and are limited by the conical surface to stop, the tower-shaped spring is compressed, and first buffering is achieved; and the buffer solution is extruded to the damping hole and overflows into the reserved groove, so that the moving contact gets close to the static contact at a uniform speed, the static contact is connected with the moving contact after the buffer solution stops overflowing, and secondary buffering is completed through constant resistance of the buffer solution.

Description

Technical Field

[0001] The invention relates to the technical field of pole-mounted circuit breakers, in particular to an intelligent pole-mounted circuit breaker. Background Art

[0002] The pole-mounted circuit breaker is a key power equipment. It is specially designed to be installed on the poles or other supporting structures of the power transmission and distribution network. It plays an important role in protecting and controlling the power system. This circuit breaker is a high-voltage electrical equipment. Its core components include mechanical switches and electromagnetic triggers, which can detect and quickly disconnect fault currents, such as overload current and short-circuit current, to ensure the stable operation of the power system. The current and voltage in the circuit are monitored in real time through the built-in current transformer and voltage transformer. Once an abnormal situation is detected, such as the current exceeds the set value or a short circuit occurs in the circuit, the circuit breaker will start immediately, and the internal electromagnetic trigger will drive the mechanical switch to quickly cut off the circuit, thereby effectively preventing equipment damage and accidents such as fire.

[0003] The pole-mounted circuit breaker is mainly composed of arc extinguishing chamber, transmission mechanism box, current transformer, voltage transformer and disconnector. The arc extinguishing chamber is wrapped with an insulating mechanism. After the circuit fault is cut off and eliminated, the pole-mounted circuit breaker automatically recloses. However, during the closing process, the push rod of the transmission mechanism drives the moving contact to hit the static contact at a certain speed. Due to factors such as elastic deformation and plastic deformation of the material, the geometric tolerance of the concentricity of the push rod of the transmission mechanism and the vacuum arc extinguishing chamber, the moving contact will rebound after the collision, resulting in bounce. If the closing bounce time is too long, the electrical wear of the vacuum arc extinguishing chamber contacts will be accelerated, shortening the electrical life of the arc extinguishing chamber. When closing the peak current, if the bounce time is too long, the arc energy in the vacuum arc extinguishing chamber will accumulate rapidly. In order to solve this problem, a primary buffer spring with a larger density is usually set at the end close to the transmission mechanism, that is, the starting position of the closing operation; and a secondary buffer spring with a smaller density is set at the end close to the arc extinguishing chamber, located after the primary buffer spring.

[0004] When the circuit breaker starts to close, the transmission mechanism will first compress the spring with a higher density. This spring has a large deformation and can absorb a large amount of impact energy in a short time, thereby slowing down the closing speed and reducing the impact force during closing. After being compressed to a certain extent, the closing process will continue to compress the spring with a lower density. This spring has a small deformation and can continuously absorb energy, slowing down the closing speed for a second time, making the contacts relatively stable, thus forming a secondary buffer mechanism. Although the closing speed gradually slows down, the collision loss of the moving and static contacts at low speeds still exists. Even for springs with a smaller deformation, after being compressed, the energy released will still cause the moving contact to rebound, resulting in a small bounce. There will be a short separation and re-contact process between the contacts. Although the reduction in the bounce amplitude can reduce the frequency and duration of arc generation, arcs will still be generated. The arcs accumulate in the arc extinguishing chamber, and it is easy for the moving and static contacts to be hot and welded later.

[0005] Therefore, an intelligent pole-mounted circuit breaker is proposed. Summary of the invention

[0006] The object of the present invention is to provide an intelligent pole-mounted circuit breaker. In order to solve the problem that the speed is slowed down by a secondary buffer mechanism, but there are still small bounces and arcs, which easily lead to hot welding of contacts, the closing speed is effectively controlled and bounces are prevented by combining a tower-shaped spring with a buffer. The spring quickly absorbs energy, and the buffer absorbs the remaining energy in a short stroke without rebound.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] An intelligent column mounted circuit breaker comprises a transmission mechanism box, an insulating mechanism and a vacuum arc extinguishing mechanism, wherein the vacuum arc extinguishing mechanism comprises an airtight insulating shell, an arc extinguishing chamber, a buffer chamber, an active chamber, a static contact, a moving contact, a tower spring and a buffer column, wherein the arc extinguishing chamber, the buffer chamber and the active chamber are arranged inside the airtight insulating shell from top to bottom, the static contact and the moving contact are arranged inside the arc extinguishing chamber, the tower spring is installed at the top of the buffer chamber, the buffer column is arranged inside the buffer chamber, the buffer column comprises an inner cavity, a piston disc, a lifting shaft 1, a lifting shaft 2 and a buffer, the inner cavity is arranged inside the buffer column, the piston disc is arranged inside the inner cavity, the lifting shaft 1 and the lifting shaft 2 are respectively located at the upper and lower ends of the piston disc, the buffer is located at the upper end of the piston disc, the transmission mechanism box drives the lifting shaft 1 to control the distance between the moving contact and the static contact after receiving a closing signal, the buffer column compresses the tower spring following the displacement of the lifting shaft 2, the buffer chamber limits the displacement of the buffer column, the lifting shaft 2 which independently displaces drives the piston disc to squeeze the buffer, and the buffer overflows until the static contact and the moving contact are connected.

[0009] From the above scheme, it can be seen that: by combining the tower spring with the buffer in the buffer column, it can not only quickly absorb and disperse the impact energy at the initial stage of closing, effectively slow down the movement speed of the moving contact, and reduce the impact force when closing, but also through the overflow mechanism of the buffer, further realize the smooth deceleration before the moving contact and the static contact contact, significantly reduce the bounce and arc generation between the contacts, thereby improving the electrical insulation performance and operational reliability of the circuit breaker. In addition, the circuit breaker has a compact structure and excellent airtight insulation performance, which ensures safe and stable operation in high voltage and high current environments, provides a strong guarantee for the reliable power supply of the power system, and has broad application prospects and important practical value.

[0010] Preferably, the buffer column is of a structure that is narrow at both ends and wide in the middle, and the lifting shaft 1 is installed at the upper end of the piston disk, one end of the lifting shaft 1 passes through the top end of the buffer column and the tower-shaped spring and is connected to the lower surface of the moving contact, and the lifting shaft 2 is installed at the lower end of the piston disk, one end of the lifting shaft 2 passes through the bottom end of the buffer column and is connected to the transmission mechanism box.

[0011] It can be seen from the above scheme that the buffer column adopts a structural design with narrow ends and wide middle, which not only enhances the stability and strength of the structure, but also optimizes the buffering performance. Lifting shaft 1 and lifting shaft 2 are respectively arranged at the upper and lower ends of the piston disc, and are respectively connected to the moving contact and the transmission mechanism box. This design makes the movement control of the moving contact more precise, and at the same time realizes the ingenious linkage between the buffer column, the tower spring and the transmission mechanism. During the closing process, the displacement of lifting shaft 2 can accurately drive the piston disc to squeeze the buffer, and cooperate with the compression of the tower spring to realize multi-level absorption and dispersion of energy, effectively slowing down the impact speed of the moving contact, reducing the vibration and noise during closing, and further improving the running stability and service life of the circuit breaker.

[0012] Preferably, the vacuum arc extinguishing mechanism further includes a limiting ring, which is located at the lower end of the buffer column and is sleeved on the surface of the second lifting shaft.

[0013] From the above scheme, it can be seen that by adding a key component, the limit ring, which is set at the lower end of the buffer column and sleeved on the surface of the second lifting shaft, not only the stability of the displacement of the buffer column and the second lifting shaft is significantly enhanced, and the structural loosening or deformation caused by excessive impact force during the closing process is effectively prevented, but also the position and size of the limit ring are precisely controlled to achieve accurate limitation of the displacement of the second lifting shaft, thereby ensuring the smooth and orderly process of buffer extrusion and overflow. In addition, the introduction of the limit ring further improves the safety and reliability of the circuit breaker, effectively avoids the arc phenomenon caused by excessive impact of the moving contact on the static contact, prolongs the service life of the equipment, and reduces maintenance costs.

[0014] Preferably, the buffer chamber is communicated with the activity chamber, the top and bottom ends of the buffer chamber are both provided with conical surfaces, and the narrow surface of the buffer column matches the conical surface.

[0015] From the above scheme, it can be seen that by connecting the buffer chamber with the activity chamber, setting conical surfaces at the top and bottom of the buffer chamber, and matching the narrow surface of the buffer column with these conical surfaces, a smoother and more efficient energy transfer and conversion is achieved. This design not only optimizes the movement trajectory of the buffer column in the buffer chamber, reduces friction and resistance, and improves the efficiency of energy absorption and dispersion, but also ensures the smoothness and precision of the buffer column during compression and reset through the guiding effect of the conical surface, effectively avoiding vibration and noise caused by poor movement. In addition, the design also strengthens the structural connection between the buffer chamber and the activity chamber, improves the stability and durability of the overall structure, and provides a strong guarantee for the long-term stable operation of the circuit breaker.

[0016] Preferably, the inner wall surface of the activity chamber is provided with a spiral groove 2, the top of the inner ring surface of the spiral groove 2 is provided with an annular groove 2, the annular groove 2 is connected with the end of the spiral groove 2, and the side surface of the limiting ring is installed with a slider 1, which matches the spiral groove 2 and the annular groove 2.

[0017] It can be seen from the above scheme that by opening a spiral groove 2 on the inner wall surface of the activity chamber and connecting an annular groove 2 to its top, and matching the slider 1 on the side surface of the limit ring with these grooves, the motion trajectory of the buffer column is further optimized and precisely controlled. This design not only ensures the smoothness and continuity of the buffer column during compression and resetting, and effectively reduces the vibration and impact caused by sudden changes in the motion trajectory, but also realizes precise adjustment of the movement speed and displacement of the buffer column through the sliding of the slider 1 in the spiral groove 2 and the annular groove 2, thereby improving the controllability and stability of the circuit breaker closing process. In addition, the design also strengthens the structural connection between the activity chamber and the buffer column, improves the firmness and durability of the overall structure, and lays a solid foundation for the long-term stable operation of the circuit breaker.

[0018] Preferably, the inner ring surface of the limit ring is provided with an annular groove 1, a vertical groove and a spiral groove 1 in sequence from bottom to top, the bottom end of the vertical groove is connected with the annular groove 1, the top end of the vertical groove is connected with the head end of the spiral groove 1, and the side surface of the lifting shaft 2 is installed with a slider 2, which matches the annular groove 1, the vertical groove and the spiral groove 1.

[0019] It can be seen from the above scheme that: through the annular groove 1, vertical groove and spiral groove 1 opened on the inner ring surface of the limit ring, and matching with the slider 2 on the side surface of the lifting shaft 2, the fine control of the movement state of the lifting shaft 2 is realized. This design not only ensures the stable movement of the lifting shaft 2 in the buffer column, effectively avoiding the impact and vibration caused by the instability of movement, but also realizes the precise guidance and adjustment of the movement trajectory of the lifting shaft 2 through the continuous sliding of the slider 2 in the annular groove 1, vertical groove and spiral groove 1, thereby improving the stability and controllability of the circuit breaker closing process. In addition, the design also strengthens the structural connection between the limit ring and the lifting shaft 2, improves the stability and durability of the overall structure, and provides a strong guarantee for the long-term stable operation of the circuit breaker.

[0020] Preferably, the piston disc is connected to the inner cavity piston, the piston disc divides the inner cavity into two areas, an upper area and a lower area, and the buffer solution is located in the upper area.

[0021] From the above scheme, it can be seen that: by closely connecting the piston disc and the inner piston, the inner cavity is cleverly divided into two upper and lower areas, and the buffer is only located in the upper area, a more efficient and precise buffer control is achieved. This design not only ensures that the buffer can flow quickly and fully when squeezed by the piston disc, thereby effectively absorbing and dispersing the impact energy during the closing process, but also avoids leakage and waste of the buffer during the compression process by separating the upper and lower areas, thereby improving the efficiency and stability of energy absorption. In addition, the design also simplifies the structure of the buffer column, reduces manufacturing costs and maintenance difficulties, and improves the reliability and durability of the buffer performance.

[0022] Preferably, a reserved groove is provided inside the top end of the buffer column, a damping hole is provided between the inner cavity and the reserved groove, and the reserved groove is connected with the inner cavity through the damping hole.

[0023] From the above scheme, it can be seen that by opening a reserved groove inside the top of the buffer column and connecting it to the inner cavity through the damping hole, the flow rate of the buffer can be finely controlled. This design not only enhances the stability and controllability of the buffer column during compression and resetting, effectively avoids the impact and vibration caused by the buffer flowing too fast or too slow, but also realizes the gradual release and absorption of the buffer energy through the throttling effect of the damping hole, thereby improving the efficiency and stability of energy conversion. In addition, the introduction of the reserved groove also facilitates the maintenance and overhaul of the buffer column, reducing maintenance costs and time.

[0024] Preferably, the diameter of the upper opening of the damping hole is larger than the diameter of the lower opening, and the small opening of the damping hole corresponds to the inner cavity.

[0025] From the above scheme, it can be seen that by designing a unique structure in which the upper opening diameter of the damping hole is larger than the lower opening diameter, and the small opening corresponds to the inner cavity, the flow velocity of the buffer solution is further optimized and controlled. This design not only ensures that the buffer solution can flow smoothly and orderly through the damping hole into the reserved groove when squeezed by the piston disc, effectively avoiding the impact and vibration caused by excessive flow velocity, but also realizes a gradual increase in the flow resistance of the buffer solution through the difference in the upper and lower opening diameters of the damping hole, thereby improving the stability and efficiency of energy absorption and dispersion, and enhancing the stability and controllability of the buffer column during compression and reset.

[0026] Preferably, the liquid volume of the buffer solution is greater than the combined volume of the reserved groove and the damping hole.

[0027] From the above scheme, it can be seen that by ensuring that the liquid volume of the buffer is greater than the combined volume of the reserved groove and the damping hole, more efficient and sufficient energy absorption and conversion is achieved. This design not only ensures that during the closing process, the buffer can continuously and stably flow into the reserved groove through the damping hole, effectively absorbing and dispersing the impact energy generated when the moving contact and the static contact come into contact, but also avoids the problem of insufficient energy absorption or poor buffering effect caused by insufficient buffer. In addition, this design also improves the durability and stability of the buffer column in multiple closing operations, ensuring the performance consistency of the circuit breaker during long-term use.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] 1. An intelligent column-mounted circuit breaker forms a secondary buffer mechanism through a tower-shaped spring and a buffer, forming a complementary buffer effect. The tower-shaped spring first acts as a primary buffer element to quickly absorb most of the energy generated during the closing process. As the closing process continues, when the compression of the tower-shaped spring reaches a certain level, the buffer begins to play a secondary buffering role. The buffer is enclosed in the inner cavity of the buffer column. When the piston disc moves upward under the drive of the lifting shaft, the buffer flows to the reserved groove through the damping hole, limiting the flow speed of the buffer, generating a constant resistance, further slowing down the movement speed of the moving contact, ensuring the smoothness and rebound-free nature of the closing process, and significantly reducing the risk of closing bounce.

[0030] 2. An intelligent column-mounted circuit breaker, in which the buffer is enclosed in the inner cavity of the buffer column, and resistance is generated by the up and down movement of the piston disc. The flow rate of the buffer is limited by the damping hole. The existence of the reserved groove ensures that there is still enough space for buffering after the buffer completely fills the inner cavity, avoiding direct impact between the piston disc and the upper top surface of the inner cavity. During the opening process, the buffer flows back to the inner cavity from the reserved groove through the damping hole to prepare for the next closing process. The recycling of the buffer not only reduces the consumption of the buffer, but also reduces the operating cost. At the same time, since the buffer is enclosed inside the circuit breaker, it avoids direct contact with the external environment, reducing pollution and safety hazards.

[0031] 3. An intelligent pole-mounted circuit breaker realizes the smooth movement of the moving contact during the closing process through the coaxiality between the transmission mechanism box, the insulation mechanism, the vacuum arc extinguishing mechanism and its internal parts (such as the lifting shaft, the buffer column, the limit ring, etc.). The tower spring and the buffer play a buffering role together. Through the coaxiality, the smooth displacement of the buffer column in the buffer chamber is ensured, thereby ensuring that the tower spring and the buffer can fully play their buffering role, which helps to increase the service life of the parts. The smooth movement also reduces the damage of the parts caused by impact and vibration, and improves the overall reliability of the circuit breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0033] Figure 2 It is a plan view of the present invention in the open state;

[0034] Figure 3 It is a cross-sectional schematic diagram of the present invention in the open state;

[0035] Figure 4 It is a schematic cross-sectional view of the cavity wall, the limiting ring and the lifting shaft of the activity chamber of the present invention;

[0036] Figure 5 It is a cross-sectional schematic diagram of the first-level buffer state of the present invention;

[0037] Figure 6 It is a plan view schematic diagram of the first-level buffer state of the present invention;

[0038] Figure 7 It is a cross-sectional schematic diagram of the present invention in a closed state;

[0039] Figure 8 It is a plan view of the closing state of the present invention.

[0040] In the figure: 1. transmission mechanism box; 2. insulation mechanism; 3. vacuum arc extinguishing mechanism; 31. airtight insulating shell; 32. arc extinguishing chamber; 33. buffer chamber; 331. conical surface; 34. movable chamber; 341. spiral groove two; 342. annular groove two; 35. static contact; 36. moving contact; 37. tower spring; 38. buffer column; 381. inner cavity; 382. piston disk; 383. lifting shaft one; 384. lifting shaft two; 385. reserved groove; 386. damping hole; 387. buffer; 39. limit ring; 391. annular groove one; 392. vertical groove; 393. spiral groove one. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] See also Figures 1 to 8 The present invention provides an intelligent pole-mounted circuit breaker, and the technical solution is as follows:

[0043] An intelligent pole-mounted circuit breaker includes a transmission mechanism box 1, an insulating mechanism 2 and a vacuum arc extinguishing mechanism 3, wherein the insulating mechanism 2 is installed at the upper end of the transmission mechanism box 1, and the vacuum arc extinguishing mechanism 3 is arranged inside the insulating mechanism 2, and is characterized in that: the vacuum arc extinguishing mechanism 3 includes an airtight insulating shell 31, an arc extinguishing chamber 32, a buffer chamber 33, an active chamber 34, a static contact 35, a moving contact 36, a tower-shaped spring 37 and a buffer column 38, the arc extinguishing chamber 32, the buffer chamber 33 and the active chamber 34 are opened from top to bottom inside the airtight insulating shell 31, the static contact 35 and the moving contact 36 are arranged inside the arc extinguishing chamber 32, the tower-shaped spring 37 is installed at the top of the buffer chamber 33, the buffer column 38 is arranged inside the buffer chamber 33, and the buffer column 38 includes an inner cavity 381, The piston disc 382, ​​the lifting shaft 1 383, the lifting shaft 2 384 and the buffer 387, the inner cavity 381 is opened inside the buffer column 38, the piston disc 382 is arranged inside the inner cavity 381, the lifting shaft 1 383 and the lifting shaft 2 384 are respectively located at the upper and lower ends of the piston disc 382, ​​and the buffer 387 is located at the upper end of the piston disc 382. After receiving the closing signal, the transmission mechanism box 1 drives the lifting shaft 1 383 to control the distance between the moving contact 36 and the static contact 35. The buffer column 38 follows the displacement of the lifting shaft 2 384 to compress the tower spring 37, and the buffer chamber 33 limits the displacement of the buffer column 38. The independently displaced lifting shaft 2 384 drives the piston disc 382 to squeeze the buffer 387, and the buffer 387 overflows until the static contact 35 and the moving contact 36 are connected.

[0044] In this embodiment, in the process when the static contact 35 and the moving contact 36 are about to contact but have not yet contacted, the tower-shaped spring 37 absorbs most of the energy, and the buffering speed is fast. The remaining stroke of the moving contact 36 is absorbed by the overflow of the buffer 387. Although the buffering speed is relatively slow, the buffering stroke is short and there is no rebound force. Through the combination of the tower-shaped spring 37 and the buffer 387, the closing speed is controlled and the speed is set within a reasonable range, and the closing bounce phenomenon is effectively prevented.

[0045] As an embodiment of the present invention, refer to Figure 1-Figure 3 The buffer column 38 is a structure that is narrow at both ends and wide in the middle. The lifting shaft 383 is installed at the upper end of the piston disk 382. One end of the lifting shaft 383 passes through the top of the buffer column 38 and the tower spring 37 from bottom to top and is connected to the lower surface of the moving contact 36. The lifting shaft 384 is installed at the lower end of the piston disk 382. One end of the lifting shaft 384 passes through the bottom of the buffer column 38 and is connected to the transmission mechanism box 1.

[0046] In this embodiment, the piston disc 382, ​​the lifting shaft 1 383 and the lifting shaft 2 384 form a piston structure with the buffer column 38, and the buffer chamber 33 is the movable space of the buffer column 38. On the one hand, the elastic force of the tower-shaped spring 37 is used to complete the first-level buffering of the closing switch. On the other hand, the tower-shaped spring 37 buffers the displacement stroke of the buffer column 38, thereby reducing the friction force when the top surface of the buffer column 38 contacts the top surface of the buffer chamber 33.

[0047] As an embodiment of the present invention, refer to Figure 1-Figure 2 The vacuum arc extinguishing mechanism 3 also includes a limiting ring 39, which is located at the lower end of the buffer column 38, and the limiting ring 39 is sleeved on the surface of the lifting shaft 384.

[0048] In this embodiment, the limit ring 39 has two movement modes, one is the movement of rotating and lifting at the same time, and the other is the movement of rotating without lifting. When the limit ring 39 rotates and lifts at the same time, the limit ring 39 moves with the lifting shaft 2 384 and presses the buffer column 38, so that the buffer column 38 and the lifting shaft 2 384 move synchronously; when it only rotates without lifting, the height of the limit ring 39 stays inside the activity chamber 34.

[0049] As an embodiment of the present invention, refer to Figure 3 The buffer chamber 33 is connected to the active chamber 34 , and a conical surface 331 is provided at the top and bottom of the buffer chamber 33 , and the narrow surface of the buffer column 38 matches the conical surface 331 .

[0050] In this embodiment, since the buffer column 38 is limited in its range of motion by the buffer chamber 33 , the deformation of the tower-shaped spring 37 is also limited within a reasonable range, thereby maintaining the elastic stability of the tower-shaped spring 37 .

[0051] As an embodiment of the present invention, refer to Figure 4 A spiral groove 2 341 is provided on the inner wall surface of the activity chamber 34, and an annular groove 2 342 is provided on the top of the inner ring surface of the spiral groove 2 341. The annular groove 2 342 is connected to the end of the spiral groove 2 341. A slider 1 is installed on the side surface of the limiting ring 39, and the slider 1 matches the spiral groove 2 341 and the annular groove 2 342.

[0052] In this embodiment, when the slider 1 of the limiting ring 39 is connected to the spiral groove 2 341 , the limiting ring 39 rotates and rises and falls, and when the slider 1 of the limiting ring 39 is connected to the annular groove 2 342 , the limiting ring 39 only rotates but does not rise and fall.

[0053] As an embodiment of the present invention, refer to Figure 4 The inner ring surface of the limit ring 39 is provided with an annular groove 391, a vertical groove 392 and a spiral groove 393 from bottom to top, the bottom end of the vertical groove 392 is connected with the annular groove 391, the top end of the vertical groove 392 is connected with the head end of the spiral groove 393, and the side surface of the lifting shaft 384 is installed with a slider 2, which matches the annular groove 391, the vertical groove 392 and the spiral groove 393.

[0054] In this embodiment, when the slider 2 of the lifting shaft 384 is connected to the annular groove 1 391 and the vertical groove 392, the slider 1 of the limit ring 39 is located in the spiral groove 2 341 to coordinate with the synchronous displacement of the height of the limit ring 39 and the lifting shaft 384; when the slider 2 of the lifting shaft 384 is connected to the spiral groove 1 393, the slider 1 of the limit ring 39 is located in the annular groove 2 342, the height of the limit ring 39 stops displacing, and the lifting shaft 384 continues to increase in height.

[0055] As an embodiment of the present invention, refer to Figure 3 , Figure 5-Figure 8 The piston disk 382 is connected to the piston of the inner cavity 381, and the piston disk 382 divides the inner cavity 381 into two upper and lower areas, and the buffer solution 387 is located in the upper area.

[0056] In this embodiment, by utilizing the characteristics of the piston, the buffer 387 moves only in the upper area of ​​the inner cavity 381, and when the range of movement begins to change, the secondary buffering begins.

[0057] As an embodiment of the present invention, refer to Figure 2 and Figure 3 A reserved groove 385 is provided inside the top of the buffer column 38 , a damping hole 386 is provided between the inner cavity 381 and the reserved groove 385 , and the reserved groove 385 is connected to the inner cavity 381 through the damping hole 386 .

[0058] In this embodiment, a pressure difference is generated when the buffer 387 reaches the damping hole 386. The pressure difference is used to control the movement of the piston disk 382 and eliminate liquid oscillation, that is, to control the moving contact 36 to start uniform deceleration movement.

[0059] As an embodiment of the present invention, refer to Figure 2 and Figure 3 The diameter of the upper opening of the damping hole 386 is larger than the diameter of the lower opening, and the small opening of the damping hole 386 corresponds to the inner cavity 381.

[0060] In this embodiment, the smaller the diameter, the lower the flow rate, and the more obvious the damping effect; the larger the diameter, the higher the flow rate, and the weaker the damping effect. When the gate is closed, the buffer 387 flows from the inner cavity 381 to the reserved groove 385 through the damping hole 386, reducing the flow rate and increasing the buffering effect; when the gate is opened, the buffer 387 flows from the reserved groove 385 to the inner cavity 381 through the damping hole 386, increasing the flow rate and improving the opening speed.

[0061] As an embodiment of the present invention, refer to Figure 5-Figure 8 , the liquid volume of the buffer solution 387 is greater than the combined volume of the reserved groove 385 and the damping hole 386.

[0062] In this embodiment, even if the inner cavity 381 is filled with the buffer solution 387, there is still the buffer solution 387 between the piston disk 382 and the upper top surface of the inner cavity 381, which can avoid the impact force between the piston disk 382 and the upper top surface of the inner cavity 381. After the inner cavity 381 is filled with the buffer solution 387, the moving contact 36 and the static contact 35 are stably connected.

[0063] Working principle: During the closing process, the movement stroke of the moving contact 36 is divided into two time periods. In the first time period, the lifting shaft 384 and the buffer column 38 move synchronously, the conical surface 331 limits the displacement of the buffer column 38 until it stops, the tower spring 37 is compressed by the buffer column 38, and the first buffering is completed by the elastic force of the tower spring 37; in the second time period, the lifting shaft 384 drives the piston disc 382 to move independently in the inner cavity 381, the buffer 387 is squeezed to the position of the damping hole 386 and overflows into the reserved groove 385, the moving contact 36 is uniformly decelerated and approaches the static contact 35, when the reserved groove 385 is filled, the overflow stops, the static contact 35 and the moving contact 36 are connected, and the constant resistance of the buffer 387 is used to complete the secondary buffering.

[0064] Specifically, in the previous time period, after the transmission mechanism box 1 receives the closing signal, it immediately presses the lifting shaft 2 384 upward, and the slider 2 on the outer ring surface of the lifting shaft 2 384 slides along the annular groove 1 391. The limit ring 39 has only the freedom of rotation relative to the lifting shaft 2 384. The limit ring 39 rotates around the lifting shaft 2 384 as the axis and is lifted upward synchronously. The slider 1 on the outer ring surface of the limit ring 39 slides along the spiral groove 2 341. The limit ring 39 rotates inside the activity chamber 34 and increases in height. Due to this time period, the limit ring 39 and the lifting shaft The second lifting shaft 384 is lifted synchronously, and the bottom of the buffer column 38 is pushed upward by the limiting ring 39. During the displacement of the buffer column 38 in the buffer chamber 33, the slider 2 of the lifting shaft 384 slides to the intersection of the vertical groove 392 and the annular groove 1 391. The lifting shaft 384 begins to have the freedom of lifting and lowering inside the limiting ring 39. The limiting ring 39 stops displacement, and the buffer column 38 is restricted between the conical surface 331 and the limiting ring 39. The tower-shaped spring 37 is compressed and gradually becomes a flat spiral. The contraction force of the tower-shaped spring 37 is used to absorb energy to complete the first buffering.

[0065] In the later time period, the lifting shaft 2 384 continues to and independently moves upward, the piston disk 382 moves upward inside the inner cavity 381, the slider 2 of the lifting shaft 2 384 slides to the head end of the spiral groove 1 393, and the slider 1 of the limiting ring 39 slides to the head end of the annular groove 2 342. At this time, the limiting ring 39 only has the freedom of rotation in the active chamber 34, and the buffer 387 is gradually pushed toward the damping hole 386. When the buffer 387 has no movable space inside the inner cavity 381, it overflows along the damping hole 386 to the inside of the reserved groove 385 until it is filled, and the constant resistance of the buffer 387 is used to complete the secondary buffering. During this process, the static contact 35 and the moving contact 36 are docked.

[0066] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent pole-mounted circuit breaker, comprising a transmission mechanism box (1) and a vacuum arc extinguishing mechanism (3), characterized in that: The vacuum arc extinguishing mechanism (3) comprises an airtight insulating shell (31), an arc extinguishing chamber (32), a buffer chamber (33), an active chamber (34), a stationary contact (35), a moving contact (36), a tower-shaped spring (37) and a buffer column (38); the arc extinguishing chamber (32), the buffer chamber (33) and the active chamber (34) are arranged inside the airtight insulating shell (31) from top to bottom; the stationary contact (35) and the moving contact (36) are located inside the arc extinguishing chamber (32); the tower-shaped spring (37) is located at the top of the buffer chamber (33); the buffer column (38) is located inside the buffer chamber (33); the buffer column (38) comprises an inner cavity (381), a piston disk (382), a lifting shaft one (383), a lifting shaft two (384) and a buffer (387); the inner cavity ( 381) is opened inside the buffer column (38), the piston disc (382) is located in the inner cavity (381), the lifting shaft one (383) and the lifting shaft two (384) are located at the upper and lower ends of the piston disc (382), and the buffer (387) is located at the upper end of the piston disc (382). After receiving the closing signal, the transmission mechanism box (1) drives the lifting shaft one (383) to control the distance between the moving contact (36) and the static contact (35), the buffer column (38) follows the displacement of the lifting shaft two (384) to compress the tower spring (37), the buffer chamber (33) limits the displacement of the buffer column (38), and the lifting shaft two (384) that moves independently drives the piston disc (382) to squeeze the buffer (387), and the buffer (387) overflows until the static contact (35) and the moving contact (36) are connected.

2. The intelligent pole-mounted circuit breaker according to claim 1, characterized in that: The buffer column (38) is a structure that is narrow at both ends and wide in the middle. The lifting shaft 1 (383) is installed at the upper end of the piston plate (382). One end of the lifting shaft 1 (383) passes through the top end of the buffer column (38) and the tower spring (37) and is connected to the lower surface of the moving contact (36). The lifting shaft 2 (384) is installed at the lower end of the piston plate (382). One end of the lifting shaft 2 (384) passes through the bottom end of the buffer column (38) and is connected to the transmission mechanism box (1).

3. The intelligent pole-mounted circuit breaker according to claim 1, characterized in that: The vacuum arc extinguishing mechanism (3) also includes a limiting ring (39), which is located at the lower end of the buffer column (38), and the limiting ring (39) is sleeved on the surface of the second lifting shaft (384).

4. The intelligent pole-mounted circuit breaker according to claim 1, characterized in that: The buffer chamber (33) is connected to the active chamber (34); the top and bottom ends of the buffer chamber (33) are both provided with conical surfaces (331); and the narrow surface of the buffer column (38) matches the conical surface (331).

5. The intelligent pole-mounted circuit breaker according to claim 3, characterized in that: The inner wall surface of the activity chamber (34) is provided with a second spiral groove (341), the top end of the inner ring surface of the second spiral groove (341) is provided with a second annular groove (342), the second annular groove (342) is connected with the end of the second spiral groove (341), and the side surface of the limiting ring (39) is provided with a first slider, which matches the second spiral groove (341) and the second annular groove (342).

6. The intelligent pole-mounted circuit breaker according to claim 5, characterized in that: The inner ring surface of the limit ring (39) is provided with an annular groove (391), a vertical groove (392) and a spiral groove (393) from bottom to top, the bottom end of the vertical groove (392) is connected to the annular groove (391), the top end of the vertical groove (392) is connected to the head end of the spiral groove (393), and the side surface of the lifting shaft (384) is installed with a slider (2), which matches the annular groove (391), the vertical groove (392) and the spiral groove (393).

7. The intelligent pole mounted circuit breaker according to claim 1, characterized in that: The piston disk (382) is connected to the piston of the inner cavity (381), and the piston disk (382) divides the inner cavity (381) into two upper and lower areas, and the buffer solution (387) is located in the upper area.

8. The intelligent pole mounted circuit breaker according to claim 1, characterized in that: A reserved groove (385) is provided inside the top end of the buffer column (38), a damping hole (386) is provided between the inner cavity (381) and the reserved groove (385), and the reserved groove (385) is connected to the inner cavity (381) through the damping hole (386).

9. The intelligent pole-mounted circuit breaker according to claim 8, characterized in that: The diameter of the upper opening of the damping hole (386) is greater than the diameter of the lower opening, and the small opening of the damping hole (386) corresponds to the inner cavity (381).

10. The intelligent pole mounted circuit breaker according to claim 8, characterized in that: The liquid volume of the buffer solution (387) is greater than the combined volume of the reserved groove (385) and the damping hole (386).

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