High-voltage cable power-on and power-off connection structure

Abstract

The invention relates to the technical field of cable connectors, in particular to a high-voltage cable power-on and power-off connection structure which comprises a connector body, a first cable and a second cable, a first power-on terminal and a second power-on terminal are arranged in the connector body, the first power-on terminal is in power-on and power-off connection with the first cable, and the second power-on terminal is in power-on and power-off connection with the second cable. The second power connection terminal is in power-on and power-off connection with the second cable; the arc extinguishing device comprises a contact piece, an arc extinguishing grid and a driving piece, the arc extinguishing grid is connected with the driving piece, the arc extinguishing grid is located above the contact piece, the arc extinguishing grid comprises a plurality of metal grid pieces and a plurality of cooling pieces, the metal grid pieces are close to each other, and meanwhile the cooling pieces cool the metal grid pieces. The technical problems that an existing high-voltage cable power-on and power-off connection structure cannot effectively adapt to dynamic fluctuation and instantaneous high heat of an electric arc due to the fact that a fixed-interval arc extinguishing grid and a passive heat dissipation mode are adopted, the arc extinguishing performance is not reliable, and a power connection terminal is prone to burning loss are solved.

Description

Technical Field

[0001] This invention relates to the field of cable joint technology, and more specifically to a high-voltage cable power-on / off connection structure. Background Technology

[0002] As an indispensable key component in power transmission and distribution systems, the high-voltage cable disconnection structure's core function is to achieve safe and reliable connection and disconnection between high-voltage cables. However, at the moment of disconnection under load, due to the contradiction between the rapid recovery of dielectric strength and the recovery voltage between the contacts, a high-temperature and high-pressure electric arc is inevitably generated. If the continuously burning arc is not suppressed and extinguished in a timely and effective manner, it will severely erode the contacts and surrounding insulation materials, leading to catastrophic accidents such as insulation deterioration, phase-to-phase short circuits, or even explosions, posing a serious threat to the stable operation of the entire power system.

[0003] Currently, the most common arc extinguishing technology in the industry is to install an arc extinguishing grid consisting of multiple metal grids on the arc path. The fixed spacing of the arc extinguishing grid is designed to mechanically divide the long arc into a series of short arcs in series. The cathode and anode voltage drops generated by the near-electrode effect accumulate to form an arc column voltage drop that is much greater than the power supply voltage, thereby forcing the arc to extinguish when the current crosses zero. However, fixed arc-extinguishing grids use a preset, unchangeable spacing between metal grid plates, and their design relies on an averaged prediction of arc development. However, the actual generated arc exhibits dynamic fluctuations in energy, length, temperature, and upstream airflow. A fixed spacing cannot provide optimal current limiting and cooling conditions. When the arc energy is strong, a fixed grid spacing may not be able to effectively divide and cool the arc, leading to prolonged arc extinguishing time or even failure to completely extinguish the arc. Secondly, existing arc-extinguishing grids rely entirely on the thermal conductivity of the metal grid plates themselves and thermal radiation to the surrounding air for cooling. This is a passive and inefficient heat dissipation mechanism, which is difficult to cope with the concentrated and instantaneous release of huge arc heat energy. This causes the metal grid plate temperature to rise sharply and thermal stress to concentrate. This not only accelerates the oxidation and deformation of the grid plate material, significantly shortening its service life, but also causes continuous heat accumulation under continuous or frequent operating conditions, resulting in a decrease in the overall heat capacity of the metal grid plate, a sharp decline in arc extinguishing performance, and a loss of reliability.

[0004] Therefore, in view of this, the inventors proposed a high-voltage cable power-on / off connection structure to solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a high-voltage cable power interruption connection structure to solve the technical problem that existing high-voltage cable power interruption connection structures, which use fixed-spacing arc-extinguishing grids and passive heat dissipation methods, cannot effectively adapt to the dynamic fluctuations and instantaneous high heat of electric arcs, resulting in reduced arc-extinguishing performance and easy burn-out of the connection terminals.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A high-voltage cable power-on / off connection structure includes a connector body, a first cable, and a second cable. The connector body is provided with a first power terminal and a second power terminal. The first power terminal is connected to the first cable for power-on / off connection, and the second power terminal is connected to the second cable for power-on / off connection. A contact element having a contact state and an open state; when the contact element is in the contact state, the first power terminal is connected to the second power terminal; when the contact element is in the open state, the first power terminal is disconnected from the second power terminal. An arc-extinguishing grid and a driving component are provided. The arc-extinguishing grid is connected to the driving component and is located above the contact component. The arc-extinguishing grid includes several metal grid plates and several cooling components. The driving component can drive the metal grid plates to move closer or further apart from each other. When the contact component changes from a contact state to a disconnected state, the metal grid plates move closer to each other, and the cooling components cool the metal grid plates.

[0007] Furthermore, the driving component includes a first driving part and a second driving part; The first drive unit includes a first sleeve, a first piston ring that is slidably connected in the first sleeve, and a first push rod that is fixedly disposed at the bottom of the first piston ring. The first sleeve is fixedly disposed at the bottom of the connector body. The first piston ring divides the interior of the first sleeve into a first chamber and a second chamber. An air inlet is provided in the first chamber, and a first one-way valve diaphragm is installed in the air inlet. A first spring is provided in the second chamber, and the first spring has the tendency to drive the first push rod to extend outward. The bottom of each of the first push rods is connected to the contact element.

[0008] Furthermore, the second drive unit includes a second sleeve, a second piston ring that is slidably connected in the second sleeve, and a second push rod that is fixedly mounted on the second piston ring. The free end of the second push rod extends out of the second sleeve and connects to the arc-extinguishing grid. The second piston ring divides the second sleeve into a third chamber and a fourth chamber. A second spring is provided in the fourth chamber, and the second spring has a tendency to drive the second piston ring to compress the third chamber. The second chamber is connected to a first trachea, and the two ends of the first trachea are connected to the second chamber and the third chamber, respectively.

[0009] Furthermore, each of the metal grid plates is arranged parallel to each other, and each of the metal grid plates has a connecting rod on both sides. The middle part of the connecting rod is hinged to the metal grid plate, and the two ends of the connecting rod are respectively hinged to the two metal grid plates on both sides of the corresponding metal grid plate. The bottom of the arc-extinguishing grid is provided with a mounting bracket, the second sleeve is hinged to the mounting bracket, and the second push rod is hinged to one of the connecting rods.

[0010] Furthermore, the cooling element is disposed between two adjacent metal gratings; The cooling component includes a first plate and a second plate. The first plate has a first air cavity inside. The second plate is slidably connected to the first air cavity. The top of the second plate extends out of the first air cavity and is hinged to one of its metal grids. The bottom of the first plate is hinged to another adjacent metal grid. The bottom of the first plate has several first air holes that communicate with the first air chamber.

[0011] Furthermore, the contact includes an insulating block and a third electrical terminal, the third electrical terminal being used to connect the first electrical terminal and the second electrical terminal, or to disconnect the first electrical terminal and the second electrical terminal; A toggle plate is provided at the bottom of the connector body, and the toggle plate is detachably and closably provided at the bottom of the connector body; The insulating block is connected to the bottom of each of the first push rods.

[0012] Furthermore, a mounting plate is fixedly disposed inside the connector body, and an arc channel for arc transmission is formed between the mounting plate and the first electrical terminal; the mounting bracket is fixedly disposed on the mounting plate.

[0013] Furthermore, the mounting plate is provided with an airflow channel, the airflow channel is connected to a second air pipe, the second air pipe is connected to the first chamber, and a second one-way valve diaphragm is installed on the second air pipe; An air blowing plate is fixedly installed above the mounting plate. The air blowing plate has a second air chamber and a plurality of second air blowing holes. Each second air blowing hole is connected to the second air chamber, and the second air chamber is connected to the airflow channel.

[0014] Furthermore, the number of the first driving units is multiple.

[0015] The beneficial effects of this invention are: This invention achieves efficient energy matching and segmentation of electric arcs through a dynamic grid pitch adjustment mechanism. When an arc is generated due to circuit disconnection, the driving component synchronously drives the metal grid plates of the arc-extinguishing grid to move closer quickly, shortening the grid plate spacing and mechanically dividing the long arc into multiple short arcs in series. The dynamic adjustment process breaks through the limitations of traditional fixed grids that rely on averaging prediction. By shortening the grid, the arc is ensured to be fully segmented. The arc column voltage drop is quickly accumulated using the near-electrode effect, and a sufficiently high dielectric recovery strength is established before the current crosses zero, thereby forcing the arc to be reliably extinguished, significantly shortening the arc extinguishing time and reducing the risk of arc reignition.

[0016] This invention employs a multi-stage active cooling system to construct an efficient thermal management mechanism, ensuring arc extinguishing stability and component durability. On one hand, the cooling components between adjacent metal grids compress the internal air chamber through mechanical linkage, generating a high-speed airflow that directly blows onto the surface of the metal grids, quickly removing the instantaneous high heat generated by the electric arc. On the other hand, the airflow channel of the mounting plate is linked with the air blowing plate, precisely spraying the compressed gas generated by the movement of the driving component onto the arc column and grid area. This dual cooling effect significantly reduces the grid temperature, preventing material oxidation and deformation. At the same time, the low-temperature surface accelerates the recombination of arc particles, enhancing the deionization effect and ensuring complete arc extinguishing. This solves the problems of low efficiency and performance degradation caused by heat accumulation in traditional passive heat dissipation, extends the service life of the arc extinguishing grid, and ensures the stable operation of the high-voltage cable start-stop connection structure under frequent or high-intensity operating conditions.

[0017] Other advantages, objectives, and features of this application will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be learned from practice of this application. The objectives and other advantages of this application may be realized and obtained through the detailed embodiments described below. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the high-voltage cable power-on / off connection structure of the present invention; Figure 2 This is a cross-sectional view of the high-voltage cable power-on / off connection structure of the present invention, which includes an electric arc. Figure 3 This is a schematic cross-sectional view of another high-voltage cable power-off connection structure of the present invention, without an electric arc. Figure 4 In the high-voltage cable power-on / off connection structure of the present invention Figure 3 A schematic diagram of a partial structure; Figure 5 In the high-voltage cable power-on / off connection structure of the present invention Figure 3 Schematic diagram of Part A; Figure 6This is a schematic diagram of the arc-extinguishing grid in the first state of the high-voltage cable power-on / off connection structure of the present invention; Figure 7 This is a schematic diagram of the arc-extinguishing grid in the second state of the high-voltage cable power-on / off connection structure of the present invention; Figure 8 This is a partial cross-sectional view of the cooling component in the high-voltage cable power-on / off connection structure of the present invention.

[0019] The components include: connector body 1, first power terminal 11, second power terminal 12, toggle plate 13, first cable 2, second cable 3, contact 4, insulating block 41, third power terminal 42, arc extinguishing grid 5, metal grid plate 51, cooling component 52, first plate 521, second plate 522, first air chamber 523, first air blowing hole 524, mounting bracket 53, connecting rod 54, driving component 6, first driving part 61, first sleeve 611, and first... Piston ring 612, first push rod 613, first chamber 614, second chamber 615, air inlet 616, first spring 617, second drive unit 62, second sleeve 621, second piston ring 622, second push rod 623, third chamber 624, fourth chamber 625, second spring 626, mounting plate 7, airflow channel 71, second air pipe 72, electric arc channel 73, air blowing plate 8, second air chamber 81, second air blowing hole 82, electric arc 9. Detailed Implementation

[0020] The embodiments of the present invention will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention and not for limiting the scope of protection of the present invention.

[0021] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. Therefore, the drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0022] This embodiment proposes a high-voltage cable power-on / off connection structure, such as... Figures 1 to 8As shown, the device includes a connector body 1, a first cable 2, and a second cable 3. The connector body 1 is provided with a first power terminal 11 and a second power terminal 12. The first power terminal 11 is connected to the first cable 2, and the second power terminal 12 is connected to the second cable 3. A contact element 4 has a contact state and an open state. When the contact element 4 is in the contact state, the first power terminal 11 and the second power terminal 12 are connected. When the contact element 4 is in the open state, the first power terminal 11 and the second power terminal 12 are disconnected. An arc-extinguishing grid 5 and a driving element 6 are also included. The arc-extinguishing grid 5 is connected to the driving element 6 and is located above the contact element 4. The arc-extinguishing grid 5 includes several metal grid plates 51 and several cooling elements 52. The driving element 6 can drive the metal grid plates 51 to move closer or further apart. When the contact element 4 changes from the contact state to the open state, the metal grid plates 51 move closer together, and the cooling elements 52 cool the metal grid plates 51.

[0023] It should be noted that actively cooling the arc-extinguishing grid 5 is a measure to improve its arc-extinguishing performance and reliability. The advantage is that it can actively and efficiently dissipate the huge heat energy of the electric arc. When the electric arc 9 is introduced into the arc-extinguishing grid 5 and divided by the metal grid plate 51, the high-temperature electric arc 9 will rapidly heat the metal grid plate 51. If the heat cannot be dissipated in time, the temperature of the metal grid plate 51 will soar. This may not only cause the metal material to soften, deform or even melt and burn, shortening the life of the metal grid plate 51, but more seriously, the high-temperature environment will maintain the ionization state of the arc column of the electric arc 9, hindering its "deionization" process. That is, a large number of free electrons and ions cannot effectively recombine into neutral particles, thereby significantly reducing the dielectric recovery strength of the arc gap, making the electric arc 9 easy to reignite or difficult to completely extinguish. Forced cooling rapidly reduces the temperature of the metal grid 51 and its surrounding area, protecting the metal grid 51 itself and ensuring its mechanical integrity and long-term stability. Furthermore, the low-temperature surface of the metal grid 51 strongly quenches the arc 9, accelerates particle recombination, and dramatically increases the arc resistance and arc voltage drop. This allows for faster absorption of the arc 9's energy and forces the current to become unsustainable after crossing zero, ultimately achieving rapid and reliable extinguishing of the arc 9. Therefore, the cooling measures fundamentally enhance the thermal management and energy dissipation capabilities of the arc-extinguishing grid 5, enabling it to maintain stable high performance even when faced with high-intensity, highly volatile arcs 9.

[0024] For ease of review and understanding, it should be noted that arc 9 may be generated when the circuit is connected or disconnected, but the probability of arc 9 being generated when the circuit is connected is very small, and the thermal radiation of arc 9 is also very low. This embodiment mainly describes the situation where arc 9 is generated during the disconnection process, because the thermal radiation of arc 9 is very high in actual operation. The most severe and critical working condition is also the core challenge and value of its technical design. When disconnecting the circuit in a energized state, a high-temperature and high-energy arc 9 will be generated at the moment of contact separation due to the extremely high electric field strength and the contradiction between the dielectric recovery and the recovery voltage. If arc 9 cannot be extinguished quickly and reliably in a very short time after it is generated, it will directly lead to severe ablation of the contact point, carbonization and degradation of the insulating material, and even catastrophic accidents such as phase-to-phase short circuit or explosion.

[0025] When contact 4 switches from the contact state to the open state, the circuit between the first electrical terminal 11 and the second electrical terminal 12 is interrupted, which may generate a high-temperature arc 9. The driving component 6 immediately responds, causing several metal grid plates 51 in the arc-extinguishing grid 5 to move closer together, reducing the spacing between the metal grid plates 51. This divides the long arc into multiple short arcs, increasing the arc column voltage drop using the near-electrode effect, and forcing the arc 9 to extinguish when the current crosses zero. Simultaneously, the cooling component 52 starts synchronously, actively cooling the metal grid plates 51, absorbing the instantaneous high heat generated by the arc 9, preventing the metal grid plates 51 from overheating, oxidizing, or deforming, and ensuring the reliability and durability of the arc-extinguishing performance. This collaborative working method not only adapts to the dynamic fluctuations of the electric arc 9 energy, but also improves the arc extinguishing efficiency through active thermal management, effectively protecting the first electrical terminal 11, the second electrical terminal 12 and the third electrical terminal 42 from burn-out, and extending the service life of the connection structure. Throughout the process, the linkage between the driving component 6 and the cooling component 52 can ensure that the arc extinguishing grid 5 is quickly adjusted at the moment of disconnection, realizing the safe disconnection of the high-voltage cable power-on / off connection.

[0026] As a preferred embodiment, such as Figure 2 , Figure 3 and Figure 4 As shown, the driving component 6 includes a first driving part 61 and a second driving part 62, as... Figure 4 and Figure 5As shown, the first drive unit 61 includes a first sleeve 611, a first piston ring 612 that is slidably connected to the first sleeve 611, and a first push rod 613 that is fixedly disposed at the bottom of the first piston ring 612. The first sleeve 611 is fixedly disposed at the bottom of the connector body 1. The first piston ring 612 divides the interior of the first sleeve 611 into a first chamber 614 and a second chamber 615. An air inlet 616 is provided in the first chamber 614, and a first one-way valve diaphragm (not shown) is installed in the air inlet 616. A first spring 617 is provided in the second chamber 615. The first spring 617 has a tendency to drive the first push rod 613 to extend downward. The bottom of each first push rod 613 is connected to the contact member 4. The second drive unit 62 includes a second sleeve 621, a second piston ring 622 that is slidably connected to the second sleeve 621, and a second push rod 623 that is fixedly disposed on the second piston ring 622. The free end of the second push rod 623 extends out of the second sleeve 621 and connects to the arc extinguishing grid 5. The second piston ring 622 divides the second sleeve 621 into a third chamber 624 and a fourth chamber 625. The fourth chamber 625 is connected to the outside. A second spring 626 is installed in the fourth chamber 625. The second spring 626 has the tendency to drive the second piston ring 622 to compress the third chamber 624. The second chamber 615 is connected to a first air pipe. The two ends of the first air pipe are connected to the second chamber 615 and the third chamber 624, respectively.

[0027] In this embodiment, when the operator closes the toggle plate 13, the toggle plate 13 drives the third electrical terminal 42 to move upward. The first electrical terminal 11 and the second electrical terminal 12 are both connected to the third electrical terminal 42, forming a connected circuit. At the same time, the toggle plate 13 drives the first push rod 613 to move upward, pushing the first piston ring 612 to compress the second chamber 615 of the first drive unit 61. The compressed gas in the second chamber 615 rushes into the third chamber 624 of the second drive unit 62 through the first air pipe, pushing the second piston ring 622 to overcome the resistance of the second spring 626 and move towards the fourth chamber 625. This, through the second push rod 623, drives the arc-extinguishing grid 5 to move in conjunction, causing the metal grid plates 51 to move away from each other, and the arc-extinguishing grid 5 to maintain a wide-spaced first state (corresponding to...). Figure 6At this time, the distance between adjacent metal grid plates 51 is a, and at the same time, the first spring 617 and the second spring 626 are in a compressed state, storing elastic potential energy. When the circuit needs to be disconnected, the operator opens the toggle switch 13, the third electrical terminal 42 moves down, and the third electrical terminal 42 is no longer connected to the first electrical terminal 11 and the second electrical terminal 12, thus disconnecting the circuit. Under the restoring force of the first spring 617, the first piston ring 612 drives the first push rod 613 down, increasing the volume of the second chamber 615. At the same time, the second spring 626 in the fourth chamber 625 extends, pushing the second piston ring 622 to compress the third chamber 624, forcing the gas in the third chamber 624 back into the second chamber 615 through the first air pipe. Combined with the direct push of the second piston ring 622 by the second spring 626, this causes the second push rod 623 to move down. Since the second push rod 623 is connected to the arc-extinguishing grid 5, it pulls all the metal grid plates 51 of the arc-extinguishing grid 5 closer together, and the arc-extinguishing grid 5 quickly transforms into the narrow-pitch second state (corresponding to...). Figure 7 The arc 9 is efficiently divided and extinguished by a fixed arc-extinguishing grid 51 with a distance b between adjacent metal grid plates 51, where a is greater than b. Traditional fixed arc-extinguishing grids 5 use a preset, unchangeable grid plate spacing, whose design relies on an averaged prediction of the arc 9's development. However, the actual generated arc 9 exhibits dynamic fluctuations in energy, length, temperature, and upstream airflow. The dynamic adjustment mechanism of this invention responds immediately to the circuit breaking and arc 9 generation by simultaneously reducing the grid pitch (distance) of the metal grid plates 51. The purpose of this pitch reduction is to divide the long arc into multiple short arcs with short spacing, adapting to the fact that regardless of the arc's energy strength, it can be quickly divided into a series of short arcs with optimal length. This fully utilizes the near-electrode effect, establishing a sufficiently high arc column voltage drop before the current crosses zero, forcing the arc 9 to quickly enter the metal grid plates 51 and be divided into multiple short arcs. This achieves energy dissipation and cooling with lower arc voltage and a faster rate, improving the arc-extinguishing effect.

[0028] In a preferred embodiment, the contact 4 includes an insulating toggle block 41 and a third electrical terminal 42. The third electrical terminal 42 is used to connect the first electrical terminal 11 and the second electrical terminal 12, or to disconnect the first electrical terminal 11 and the second electrical terminal 12. A toggle plate 13 is provided at the bottom of the connector body 1. The toggle plate 13 is detachably provided at the bottom of the connector body 1. The insulating toggle block 41 is connected to the bottom of each of the first push rods 613.

[0029] In this embodiment, when the operator operates the toggle plate 13 to open or close, the action is first directly transmitted to the insulating block 41 connected to it. Since the insulating block 41 is fixedly connected to the bottom of the first push rod 613 of each first drive part 61, the opening and closing of the toggle plate 13 will drive the entire insulating block 41 and the first push rod 613 to move up and down synchronously. The third electrical terminal 42 fixed on the insulating block 41 moves accordingly; when the toggle plate 13 is closed, it pushes the insulating block 41 to move upward, so that the third electrical terminal 42 simultaneously makes electrical contact with the first electrical terminal 11 and the second electrical terminal 12, thereby realizing the connection of the circuit; conversely, when the toggle plate 13 is open, it drives the insulating block 41 and the third electrical terminal 42 to move downward, so that they are separated from the first electrical terminal 11 and the second electrical terminal 12, thereby cutting off the circuit.

[0030] In a preferred embodiment, a mounting plate 7 is fixedly disposed inside the connector body 1, and an arc channel 73 for the transmission of the arc 9 is formed between the mounting plate 7 and the first electrical terminal 11. The mounting bracket 53 is fixedly disposed on the mounting plate 7.

[0031] In this embodiment, the bottom of the first electrical terminal 11 has a pointed conical structure to facilitate the guidance of the generated electric arc 9. Guiding the electric arc 9 is existing technology and not within the scope of this application; therefore, it will not be described in detail here. A specific gap is maintained between the mounting plate 7 and the first electrical terminal 11, forming an arc channel 73 for guiding the movement of the electric arc 9. When the contact 4 is disconnected and the electric arc 9 is generated between the first electrical terminal 11 and the third electrical terminal 42, the generated electric arc 9 is guided by electromagnetic force and upstream airflow into this preset arc channel 73, thereby being directed to the arc-extinguishing grid 5 area, creating prerequisites for the subsequent arc-extinguishing process. Simultaneously, the mounting bracket 53 at the bottom of the arc-extinguishing grid 5 is firmly fixed to the mounting plate 7, ensuring that the entire movable arc-extinguishing grid 5 has a stable mechanical support foundation when subjected to the impact force of the electric arc 9 and frequent movements. Therefore, the mounting plate 7 not only serves as a directional guiding structure for the electric arc 9, efficiently introducing the electric arc 9 into the arc extinguishing grid 5, but also as a rigid mounting base for the entire arc extinguishing system, ensuring the coordinated operation of each component and the structural reliability during the dynamic arc extinguishing process.

[0032] In a preferred embodiment, there are multiple first drive units 61. Using multiple first drive units 61 ensures that the driving force on the insulating block 41 and the third electrical terminal 42 is uniform and stable when the toggle plate 13 is operated. This avoids the uneven load, jamming, or uneven wear that may occur with single-point drive, thereby ensuring the smoothness and reliability of circuit connection and disconnection. Secondly, when an electric arc 9 needs to be extinguished, multiple first drive units 61 can operate synchronously, jointly compressing their respective second chambers 615. The third chamber 624 of the second drive unit 62 is connected through multiple first air pipes, delivering a larger volume, faster speed, and more stable pressure airflow. This provides ample and consistent pneumatic power for the arc-extinguishing grid 5 to quickly, powerfully, and synchronously complete the transition from wide spacing to narrow spacing. This allows all metal grid plates 51 to approach each other almost simultaneously and uniformly, effectively avoiding the risk that the electric arc 9 may not be divided in time or extinguished completely due to asynchronous operation. This redundant parallel design not only enhances the mechanical robustness of the structure, but also greatly improves the overall performance and lifespan in the face of frequent operation or high-intensity electric arc conditions.

[0033] In a preferred embodiment, each metal grid plate 51 is arranged parallel to each other, and each metal grid plate 51 has a connecting rod 54 on both sides. The middle part of the connecting rod 54 is hinged to the metal grid plate 51, and the two ends of the connecting rod 54 are respectively hinged to the two metal grid plates 51 on both sides of the corresponding metal grid plate 51. The bottom of the arc extinguishing grid 5 is provided with a mounting frame 53, the second sleeve 621 is hinged to the mounting frame 53, and the second push rod 623 is hinged to one of the connecting rods 54. The cooling element 52 is disposed between two adjacent metal grids 51; the cooling element 52 includes a first plate 521 and a second plate 522. The first plate 521 has a first air chamber 523 inside, and the second plate 522 is slidably connected to the first air chamber 523. The top of the second plate 522 extends out of the first air chamber 523 and is hinged to one of its metal grids 51. The bottom of the first plate 521 is hinged to another adjacent metal grid 51. The bottom of the first plate 521 has a plurality of first air holes 524 communicating with the first air chamber 523.

[0034] In this embodiment, when the operator changes the toggle switch 13 from the closed state to the open state ( Figure 6 The arc-extinguishing grid 5 in the middle is converted to Figure 7The arc-extinguishing grid 5) is interrupted, and a high-temperature electric arc 9 is generated between the first electrical terminal 11 and the third electrical terminal 42. The electric arc 9 is introduced into the area of ​​the arc-extinguishing grid 5 through the electric arc channel 73. At the same time, under the action of the driving member 6, all the metal grid pieces 51 begin to approach each other, and the grid spacing is reduced synchronously. The reduction action is directly transmitted to the cooling member 52 through the mechanical hinge. Since each metal grid piece 51 is hinged to the first plate 521 or the second plate 522 of the cooling member 52, when the metal grid pieces 51 approach each other, the second plate 522 is forced to slide relative to the first plate 521. Specifically, the second plate 522 moves into the first air cavity 523 of the first plate 521, thereby significantly compressing the air in the first air cavity 523. The compressed air instantly forms a high-speed airflow, which is ejected from several first air holes 524 opened at the bottom of the first plate 521. It blows precisely and directly onto the surface of the adjacent metal grid 51. On the one hand, this airflow can disperse the high-temperature ionized gas of the electric arc 9 and weaken the energy of the electric arc 9; on the other hand, it can quickly remove a large amount of heat from the metal grid 51 through convection heat transfer, effectively reducing its temperature and preventing the metal grid 51 from overheating, deforming or burning. Thus, based on the dynamic reduction of the arc spacing 9, the arc extinguishing efficiency and system reliability are further significantly enhanced by active air cooling.

[0035] In a preferred embodiment, the mounting plate 7 is provided with an airflow channel 71, which is connected to a second air pipe 72. The second air pipe 72 is connected to the first chamber 614 and is equipped with a second one-way valve diaphragm. An air blowing plate 8 is fixedly provided above the mounting plate 7. The air blowing plate 8 is provided with a second air chamber 81 and a plurality of second air blowing holes 82. Each second air blowing hole 82 is connected to the second air chamber 81, and the second air chamber 81 is connected to the airflow channel 71.

[0036] The airflow channel 71, the second air pipe 72, and the air blowing plate 8 together constitute an active air-cooled arc-extinguishing mechanism linked to the driving component 6. The working process begins with the movement of the driving component 6. When the actuating plate 13 closes, it causes the first push rod 613 to move upward and compress the second chamber 615. External gas enters the first chamber 614 through the air inlet 616. The first one-way valve diaphragm allows airflow to enter the first chamber 614 in one direction, but does not allow gas in the first chamber 614 to exit through the air inlet 616. When the actuating plate 13 opens, the first piston ring 612 of the first driving part 61 moves downward, causing the first push rod 613 to move downward. At this time, the first chamber 614 is compressed, and the airflow in the first chamber 614 enters the airflow channel 71 through the second air pipe 72. The function of the second one-way valve diaphragm is to only allow airflow to flow into the airflow channel 71 in one direction. The airflow in the airflow channel 71 enters the second air chamber 81 of the blowing plate 8 and is concentratedly ejected from a number of second blowing holes 82. This airflow is directly sprayed onto the metal grid 51, which can quickly disperse the ionized gas and carry away a huge amount of heat, significantly reducing the temperature of the arc-extinguishing grid and greatly enhancing the deionization effect and the medium recovery strength. Thus, it forms a highly efficient synergy with the mechanical segmentation effect of the arc-extinguishing grid 5 to jointly ensure that the electric arc 9 is extinguished quickly and reliably.

[0037] This invention achieves energy adaptation and efficient segmentation of the electric arc 9 through a dynamic grid pitch adjustment mechanism. When the circuit is broken and an electric arc 9 is generated, the driving component 6 synchronously drives the metal grid plates 51 of the arc-extinguishing grid 5 to move closer quickly, shortening the spacing of the metal grid plates 51 and mechanically dividing the long electric arc into multiple short electric arcs in series. The dynamic adjustment process breaks through the limitation of traditional fixed grids relying on average prediction. By shortening the spacing, the electric arc 9 is ensured to be fully segmented. The near-electrode effect is used to quickly accumulate the arc column voltage drop and establish a sufficiently high dielectric recovery strength before the current crosses zero, thereby forcing the electric arc 9 to be reliably extinguished, significantly shortening the arc extinguishing time and reducing the risk of arc 9 reignition. At the same time, a multi-stage active cooling system is used to construct an efficient thermal management mechanism to ensure arc extinguishing stability and component durability. On the one hand, adjacent metal grid plates The cooling element 52 between 51 generates a high-speed airflow through mechanical linkage to directly blow on the surface of the metal grid 51, quickly removing the instantaneous high heat generated by the electric arc 9. On the other hand, the airflow channel 71 of the mounting plate 7 is linked with the air blowing plate 8 to accurately spray the compressed gas generated by the movement of the driving element 6 onto the arc column of the electric arc 9 and the area of ​​the metal grid 51. The dual cooling effect significantly reduces the temperature of the metal grid 51, preventing material oxidation and deformation. At the same time, the low-temperature surface accelerates the recombination of electric arc 9 particles, enhances the deionization effect, and ensures that the electric arc 9 is completely extinguished. This solves the problems of low efficiency and performance degradation caused by heat accumulation in traditional passive heat dissipation, extends the service life of the arc extinguishing grid 5, and ensures the stable operation of the high-voltage cable start-stop connection structure under frequent or high-intensity working conditions. This application has high application value.

[0038] The above embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention.

Claims

1. A high-voltage cable power-on / off connection structure, characterized in that, include: The connector body (1), the first cable (2), and the second cable (3) are provided. The connector body (1) is provided with a first power terminal (11) and a second power terminal (12). The first power terminal (11) is connected to the first cable (2), and the second power terminal (12) is connected to the second cable (3). The contact (4) has a contact state and a disconnected state; when the contact (4) is in the contact state, the first power terminal (11) is connected to the second power terminal (12); when the contact (4) is in the disconnected state, the first power terminal (11) is disconnected from the second power terminal (12). An arc-extinguishing grid (5) and a driving member (6) are provided. The arc-extinguishing grid (5) is connected to the driving member (6). The arc-extinguishing grid (5) is located above the contact member (4). The arc-extinguishing grid (5) includes a plurality of metal grid plates (51) and a plurality of cooling members (52). The driving member (6) can drive the metal grid plates (51) to move closer or further away from each other. When the contact member (4) changes from a contact state to a disconnected state, the metal grid plates (51) move closer to each other, and at the same time, the cooling members (52) cool the metal grid plates (51).

2. The high-voltage cable power-on / off connection structure according to claim 1, characterized in that: The driving component (6) includes a first driving part (61) and a second driving part (62); The first drive unit (61) includes a first sleeve (611), a first piston ring (612) that is slidably connected in the first sleeve (611), and a first push rod (613) that is fixedly disposed at the bottom of the first piston ring (612). The first sleeve (611) is fixedly disposed at the bottom of the connector body (1). The first piston ring (612) divides the interior of the first sleeve (611) into a first chamber (614) and a second chamber (615). An air inlet (616) is provided in the first chamber (614). A first one-way valve diaphragm is installed in the air inlet (616). A first spring (617) is provided in the second chamber (615). The first spring (617) has the tendency to drive the first push rod (613) to extend outward. The bottom of each of the first push rods (613) is connected to the contact member (4).

3. The high-voltage cable power-on / off connection structure according to claim 2, characterized in that: The second drive unit (62) includes a second sleeve (621), a second piston ring (622) that is slidably connected in the second sleeve (621), and a second push rod (623) that is fixedly mounted on the second piston ring (622). The free end of the second push rod (623) extends out of the second sleeve (621) and is connected to the arc extinguishing grid (5). The second piston ring (622) divides the second sleeve (621) into a third chamber (624) and a fourth chamber (625). A second spring (626) is provided in the fourth chamber (625). The second spring (626) has a tendency to drive the second piston ring (622) to compress the third chamber (624). The second chamber (615) is connected to a first trachea (618), and the two ends of the first trachea (618) are connected to the second chamber (615) and the third chamber (624) respectively.

4. The high-voltage cable power-on / off connection structure according to claim 3, characterized in that: Each of the metal grid plates (51) is arranged in parallel to each other. Each of the metal grid plates (51) has a connecting rod (54) on both sides. The middle part of the connecting rod (54) is hinged to the metal grid plate (51), and the two ends of the connecting rod (54) are respectively hinged to the two metal grid plates (51) on both sides of the corresponding metal grid plate (51). The bottom of the arc-extinguishing grid (5) is provided with a mounting bracket (53), the second sleeve (621) is hinged to the mounting bracket (53), and the second push rod (623) is hinged to one of the connecting rods (54).

5. The high-voltage cable power-on / off connection structure according to claim 4, characterized in that: The cooling element (52) is disposed between two adjacent metal gratings (51); The cooling component (52) includes a first plate (521) and a second plate (522). The first plate (521) has a first air chamber (523) inside. The second plate (522) is slidably connected to the first air chamber (523). The top of the second plate (522) extends out of the first air chamber (523) and is hinged to one of its metal grids (51). The bottom of the first plate (521) is hinged to another adjacent metal grid (51). The bottom of the first plate (521) is provided with a plurality of first air holes (524) that communicate with the first air chamber (523).

6. The high-voltage cable power-on / off connection structure according to claim 5, characterized in that: The contact (4) includes an insulating block (41) and a third electrical terminal (42), the third electrical terminal (42) being used to connect the first electrical terminal (11) and the second electrical terminal (12), or to disconnect the first electrical terminal (11) and the second electrical terminal (12); The bottom of the connector body (1) is provided with a toggle plate (13), which is detachably disposed at the bottom of the connector body (1), and the insulating toggle block (41) is connected to the bottom of each of the first push rods (613).

7. The high-voltage cable power-on / off connection structure according to claim 6, characterized in that: The connector body (1) is fixedly provided with an installation plate (7), and an arc channel (73) for arc transmission is formed between the installation plate (7) and the first electrical terminal (11); the mounting bracket (53) is fixedly provided on the installation plate (7).

8. The high-voltage cable power-on / off connection structure according to claim 7, characterized in that: An airflow channel (71) is provided on the mounting plate (7), and the airflow channel (71) is connected to a second air pipe (72). The second air pipe (72) is connected to the first chamber (614), and a second one-way valve diaphragm is installed on the second air pipe (72). An air blowing plate (8) is fixedly installed above the mounting plate (7). The air blowing plate (8) has a second air chamber (81) and a number of second air blowing holes (82). Each second air blowing hole (82) is connected to the second air chamber (81), and the second air chamber (81) is connected to the airflow channel (71).

9. The high-voltage cable power-on / off connection structure according to any one of claims 2 to 8, characterized in that: The number of the first driving units (61) is multiple.

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