A direct current disconnector

Abstract

The application relates to a direct-current isolating switch and belongs to the technical field of isolating switches. The application provides a direct-current isolating switch which comprises a base, static contacts and moving contacts are arranged on the two sides of the base respectively, static arc contacts are arranged above the static contacts, a cavity separation type arc extinguishing structure is arranged at the upper portion of the direct-current isolating switch, and the cavity separation type arc extinguishing structure comprises an arc extinguishing baffle group which can move. In the whole process of switching on and off, the arc extinguishing baffle group is penetrated by a long arc initiation piece of the moving contact and is driven to translate, a ladder-shaped layer plate structure which keeps isolation between the upper portion and the lower portion at all times is formed, the base structure cooperates with a limiting structure of an arc extinguishing cover, centralized directional introduction of arc extinguishing airflow, effective closure of a contact gap and multiple improvement of internal insulation protection are realized, and therefore the arc extinguishing performance is fast and reliable under the condition of direct-current breaking.

Description

Technical Field

[0001] This invention relates to a DC disconnecting switch, belonging to the field of disconnecting switch technology. Background Technology

[0002] In the field of low-voltage electrical appliances, DC disconnect switches are key devices in power distribution circuits used for connecting and disconnecting the main circuit and providing isolation. With the continuous improvement of voltage levels and capacity in new energy systems, higher requirements are placed on the breaking performance and reliability of DC disconnect switches. Because DC current lacks a natural zero-crossing characteristic, the arc is difficult to extinguish itself during the breaking process; reliable arc extinguishing has become a core challenge in the design and development of DC disconnect switches.

[0003] Current arc-extinguishing technology for DC disconnect switches primarily relies on a combination of air blowing and magnetic blowing to drive the arc into the arc-extinguishing chamber. The arc is then elongated and cut by a grid structure within the chamber to increase the arc voltage, achieving rapid arc extinguishing. The basic structural logic is as follows: an arc-extinguishing chamber is placed above the contact system. The high temperature generated during arc combustion causes the gas-generating material to release gas, which, through expansion pressure, blows the arc into the chamber for extinguishing. Simultaneously, the switch typically employs a layered or compartmentalized layout, integrating the contact system, arc-extinguishing chamber, and terminals into a single housing. The main circuit's on / off control is achieved through an operating mechanism.

[0004] However, the above-mentioned structural design has several shortcomings in actual operation. First, the arc-extinguishing chamber's ability to constrain and guide the arc-blowing airflow is insufficient. During arc combustion, the airflow generated by the rapid expansion of the vaporized gas is not concentrated and directed towards the arc-extinguishing chamber. In addition to entering the arc-extinguishing chamber upwards, a considerable portion of the high-temperature, high-pressure gas diffuses in all directions, especially towards the lower main contact gap area. This portion of high-temperature gas diffusing into the contact gap carries conductive particles, reducing the dielectric recovery strength of the contact gap, increasing the probability of re-breakdown between the main contacts, and directly weakening the switching reliability. Second, there is a lack of effective airflow isolation design between the various functional areas inside the switch. Free gas and conductive dust generated during arc extinguishing are prone to diffuse and deposit within the casing, affecting the surface insulation performance of the insulating components and posing a risk of insulation degradation under long-term operation. Third, the overall structural layout does not adequately consider the airflow channel between the contact gap and the arc-extinguishing chamber, limiting the speed and concentration of the arc entering the arc-extinguishing chamber, making it difficult to achieve rapid and thorough arc extinguishing under DC breaking conditions.

[0005] It is evident that existing DC disconnect switches still have significant room for improvement in terms of arc-extinguishing chamber airflow directional control, internal insulation protection, and overall structural layout. Therefore, there is an urgent need to find a DC disconnect switch structural design that can effectively constrain the arc-extinguishing airflow direction and suppress the diffusion of high-temperature gas into the contact gap. This design needs to enhance the arc-extinguishing chamber's ability to directionally guide airflow, improve the arc extinguishing speed, and simultaneously improve the internal airflow isolation and insulation protection design of the switch, thereby achieving faster and more reliable breaking performance in high-voltage, high-capacity applications in new energy systems. Summary of the Invention

[0006] To address the aforementioned problems, this invention provides a DC disconnect switch, comprising: a base disposed at the lower part of the DC disconnect switch, with a stationary contact and a moving contact respectively disposed on both sides of the base, and a stationary arc contact disposed above the stationary contact; a cavity-separated arc extinguishing structure disposed at the upper part of the DC disconnect switch, the cavity-separated arc extinguishing structure including a movable arc extinguishing baffle assembly, the arc extinguishing baffle assembly dividing the cavity inside the DC disconnect switch into upper and lower parts, and the arc extinguishing baffle assembly and the upper cavity forming an arc extinguishing chamber; the stationary arc contact is located on one side of the upper cavity, and the stationary contact and the moving contact are respectively located on both sides of the lower cavity.

[0007] The arc-extinguishing baffle assembly includes multiple baffles of different lengths stacked sequentially according to their length. The long arc-inducing plate of the moving contact passes through all the baffles of the arc-extinguishing baffle assembly and can drive the arc-extinguishing baffle assembly to move during the opening and closing process. During the movement, the arc-extinguishing baffle assembly changes into different stepped layered plate structures formed by multiple baffles and always separates the upper and lower parts of the cavity. In some embodiments, the arc-extinguishing baffle group includes a first baffle, a second baffle, a third baffle, and a fourth baffle stacked sequentially from top to bottom. The first baffle and the second baffle have the same length, and the third baffle and the fourth baffle have the same length and are both greater than the lengths of the first baffle and the second baffle.

[0008] In some embodiments, the first baffle, the second baffle, the third baffle, and the fourth baffle are respectively provided with elongated first clearance holes, second clearance holes, third clearance holes, and fourth clearance holes, and the width of each of them allows the long arc-drawing piece to pass through. The lengths of the first clearance holes and the second clearance holes are the same, and the lengths of the third clearance holes and the fourth clearance holes increase sequentially compared to the lengths of the first clearance holes and the second clearance holes. When the circuit is closed, the arc-extinguishing baffle assembly slides under the action of the long arc-inducing plate. The long contact plate stops sliding due to the restriction of the first clearance hole and the second clearance hole, which also causes the first baffle and the second baffle to stop sliding. The third baffle and the fourth baffle are jointly restricted from sliding by the arc-extinguishing cover and the third clearance hole and the fourth clearance hole. When the circuit breaker is opened, the long arc-drawing plate first drives the first and second baffles to slide through the first and second clearance holes of the arc-extinguishing baffle, and then gradually drives the third and fourth baffles to slide through the third and fourth clearance holes until the moving contact reaches the opening position.

[0009] In some embodiments, the base is an umbrella-like structure and is disposed on the inner wall of the lower cavity, thereby forming a spatial structure in which the lower cavity is narrower at the top and wider at the bottom.

[0010] In some embodiments, the arc-extinguishing chamber includes an arc-extinguishing cover, and an angular limiting structure is provided on one side inside the arc-extinguishing cover to limit the stroke of the long arc-drawing plate, and also to limit the flow of gas in the arc-extinguishing chamber to the rear, and to prevent the gas from flowing downward and backward; when the moving contact reaches the open position, the long arc-drawing plate is limited and stopped by the limiting structure.

[0011] In some embodiments, the lower part of the arc-extinguishing shroud is provided with a sliding groove that cooperates with the arc-extinguishing baffle assembly. When the long arc-inducing plate of the moving contact rotates back and forth, it can drive the arc-extinguishing baffle assembly to move along the sliding groove.

[0012] In some embodiments, the arc-extinguishing hood is provided with a groove on the other side of the limiting structure, the groove being located above the slide groove, for limiting, insulating and sealing the air passage of the static arc contact.

[0013] In some embodiments, the lower surface of the chute is provided with a limiting step to block some of the baffles in the arc-extinguishing baffle assembly.

[0014] In some embodiments, the limiting step includes a first limiting step and a second limiting step arranged sequentially from top to bottom. When the circuit is closed, the third baffle and the fourth baffle are restricted from sliding by the first limiting step and the second limiting step on the lower surface of the arc extinguishing cover's slide groove, as well as the third clearance hole and the fourth clearance hole.

[0015] In some embodiments, the length of the first limiting step is less than the length of the second limiting step.

[0016] Advantages and effects of the present invention: This invention provides a DC disconnecting switch that dynamically divides the internal cavity of the switch into an upper arc-extinguishing chamber and a lower contact chamber by incorporating a cavity-separated arc-extinguishing structure with a stepped arc-extinguishing baffle assembly at the upper part and a base with an umbrella-like structure at the lower end. During the entire opening and closing process, the arc-extinguishing baffle assembly is penetrated and driven to move by the long arc-leading piece of the moving contact, forming a stepped layer structure that maintains vertical isolation. Simultaneously, the base structure and the arc-extinguishing shroud limiting structure work together to achieve concentrated and directional introduction of arc-extinguishing airflow, effective sealing of the contact gap, and multiple enhancements in internal insulation protection, thereby achieving rapid and reliable arc-extinguishing performance under DC disconnection conditions.

[0017] The specific beneficial effects are as follows: 1. The stepped arc-extinguishing baffle assembly dynamically isolates the upper and lower chambers throughout the entire process, while also providing pressure maintenance, significantly improving the reliability of the circuit breaker's operation. The arc-extinguishing baffle assembly consists of multiple baffles of varying lengths stacked together. Throughout the opening and closing process of the disconnecting switch, it maintains complete isolation between the arc-extinguishing chamber and the lower contact chamber. This not only confines the arc within the upper arc-extinguishing chamber, preventing high-temperature conductive gas from diffusing into the main contact gap and reducing the probability of repeated breakdown, but also provides pressure maintenance, concentrating the air pressure in the arc-extinguishing direction, significantly enhancing the switch's breaking reliability.

[0018] 2. The differentiated design of the baffle clearance groove length ensures that the left side of the baffle assembly remains closed during the opening process, enhancing the directional air blowing effect. The clearance groove of the lower baffle in the arc-extinguishing baffle assembly is longer than that of the upper baffle. During opening, the long-acting arc-initiating plate moves to one side, and the difference in clearance groove length drives the sliding of each layer of baffles in sequence. This ensures that the left side of the baffle assembly remains closed during the deployment process, preventing gas leakage into the contact gap through the gap on the left side of the baffle assembly. This ensures that the air blowing airflow concentrates and propels the arc into the arc-extinguishing chamber, accelerating the arc extinguishing speed.

[0019] 3. During the closing process, the right side of the baffle assembly is arranged in a stepped manner, balancing a compact structure with effective cavity isolation. During closing, the long arc-guiding plate moves in the opposite direction, limiting the position of the upper baffle and stopping the lower baffle after reaching the limit step, resulting in a stepped distribution on the right side of the arc-extinguishing baffle assembly. This method ensures a compact structure in the closed state without occupying additional space, while maintaining effective isolation between the upper and lower cavities, achieving synergistic optimization of space utilization and arc-extinguishing performance.

[0020] 4. The umbrella-shaped base creates a narrow-at-the-top, wide-at-the-bottom space, enhancing airflow direction and insulation protection. The base is designed as an umbrella-shaped structure located on the inner wall of the lower cavity, forming a narrow-at-the-top, wide-at-the-bottom spatial shape. This structure guides the arc-extinguishing airflow more concentratedly upwards into the arc-extinguishing chamber, reducing the diffusion and deposition of high-temperature gas in the lower contact area. Simultaneously, it increases the creepage distance on the surface of the insulating components, improving the insulation protection performance inside the switch and reducing the risk of insulation degradation during long-term operation.

[0021] 5. The arc-extinguishing baffle assembly is directly linked to the moving contact, ensuring synchronized action and reliable structure. The arc-extinguishing baffle assembly is directly driven by the long arc-guiding plate of the moving contact, eliminating the need for an additional drive mechanism. The baffle assembly's action is completely synchronized with the opening and closing of the contacts, with no lag in response. Its simple and compact structure ensures that the baffle assembly can reliably complete the cavity separation in each operation, improving the inherent reliability and service life of the system.

[0022] 6. The corner-shaped limiting structure of the arc-extinguishing chamber combines limiting and pressure-holding functions, improving gas blowing efficiency. The corner-shaped limiting structure set on one side inside the arc-extinguishing chamber serves two purposes: firstly, it provides a limit to the end of the opening stroke of the long arc-starting plate, preventing it from moving excessively backward; secondly, it seals the air passage at the rear of the arc-extinguishing chamber, restricting the backward and downward flow of high-pressure gas, thus maintaining pressure. This allows the arc energy to be more concentrated and dissipated inside the arc-extinguishing chamber, propelling the arc into the chamber quickly and shortening the arc burning time.

[0023] 7. The arc-extinguishing chamber features a multi-functional design that enhances the insulation and airtightness of the stationary arc contact area. A groove is provided on the opposite side of the arc-extinguishing chamber from the limiting structure for limiting, insulating, and sealing the air passage of the stationary arc contact; the lower sliding groove, in conjunction with the limiting step, precisely controls the stopping position of each baffle. These structural features work together to further enhance the airtightness and insulation strength of the arc-extinguishing chamber end, ensuring the stable performance of the air-blown arc-extinguishing effect. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the closed position of the present invention.

[0025] Figure 2 This is a schematic diagram of the circuit breaker position according to the present invention.

[0026] Figure 3 This is a schematic diagram of the structure of the moving contact of the present invention.

[0027] Figure 4 This is an exploded view of the arc-extinguishing baffle assembly of the present invention.

[0028] Figure 5 This is a schematic diagram of the overall planar structure of the arc-extinguishing chamber of the present invention.

[0029] Figure 6 This is a three-dimensional structural diagram of one side of the arc-extinguishing chamber of the present invention.

[0030] In the figure, 1 is the moving contact; 2 is the arc-extinguishing baffle assembly; 3 is the arc-extinguishing chamber; 4 is the stationary arc contact; 5 is the stationary contact; 6 is the base; 11 is the long arc-starting plate; 12 is the short contact plate; 21 is the first baffle; 22 is the second baffle; 23 is the third baffle; 24 is the fourth baffle; 211 is the first clearance hole; 221 is the second clearance hole; 231 is the third clearance hole; 241 is the fourth clearance hole; 31 is the arc-extinguishing cover; 301 is the limiting structure; 302 is the sliding groove; 303 is the first limiting step; 304 is the second limiting step. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0033] In this invention, the terms "first" and "second" are used only to distinguish similar components / parts in different positions or with different characteristics, and have no other limiting meaning; "upper" refers to the direction in which each component is away from the ground, and "lower" refers to the direction in which each component is away from the ground.

[0034] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0035] This invention provides a DC disconnecting switch, which dynamically divides the internal cavity of the switch into an upper arc-extinguishing chamber and a lower contact chamber by setting a cavity-separated arc-extinguishing structure with a stepped arc-extinguishing baffle group in the upper part and a base with an umbrella-like structure at the lower end, thereby achieving fast and reliable arc-extinguishing performance under DC interruption conditions.

[0036] The DC disconnect switch includes: a base 6, disposed at the lower part of the DC disconnect switch, with stationary contacts 5 and moving contacts 1 respectively disposed on both sides of the base 6, and a stationary arc contact 4 disposed above the stationary contacts 5; and a cavity-separated arc-extinguishing structure, disposed at the upper part of the DC disconnect switch, the cavity-separated arc-extinguishing structure including a movable arc-extinguishing baffle assembly 2, the arc-extinguishing baffle assembly 2 dividing the cavity inside the DC disconnect switch into upper and lower parts, and the arc-extinguishing baffle assembly 2 and the upper cavity together forming an arc-extinguishing chamber 3; the stationary arc contact 4 is located on one side of the upper cavity, and the stationary contact 5 and moving contact 1 are respectively located on both sides of the lower cavity. The arc-extinguishing baffle assembly 2 is composed of multiple baffles of different lengths stacked together, which keeps the cavity where the arc-extinguishing chamber 3 is located isolated from the cavity where the lower contact is located throughout the opening and closing process. This not only confines the electric arc within the upper arc-extinguishing chamber 3, preventing high-temperature conductive gas from diffusing into the main contact gap and reducing the probability of repeated breakdown, but also has a pressure-holding function, concentrating the air pressure in the arc-extinguishing direction, significantly enhancing the switching reliability.

[0037] The arc-extinguishing baffle assembly 2 comprises multiple baffles of different lengths stacked sequentially according to their length. The long arc-inducing plate 11 of the moving contact 1 penetrates all the baffles of the arc-extinguishing baffle assembly 2 and can drive the arc-extinguishing baffle assembly 2 to translate during the opening and closing process. During the translation, the arc-extinguishing baffle assembly 2 transforms into different stepped layered plate structures formed by multiple baffles, always separating the upper and lower parts of the cavity. The arc-extinguishing baffle assembly 2 is directly penetrated and driven to translate by the long arc-inducing plate 11 of the moving contact 1, without the need for an additional driving mechanism. The action of the baffle assembly is completely synchronized with the opening and closing of the contact, with no lag in response. The structure is simple and compact, ensuring that the baffle assembly can reliably complete the cavity separation in each operation, improving the inherent reliability and service life of the system. The moving contact 1 also includes short contact plates 12 disposed below the long arc-inducing plate 11. There are multiple short contact plates 12 arranged in a straight line below the long arc-inducing plate 11.

[0038] In some embodiments, the arc-extinguishing baffle assembly 2 includes a first baffle 21, a second baffle 22, a third baffle 23, and a fourth baffle 24 stacked sequentially from top to bottom. The first baffle 21 and the second baffle 22 have the same length, and the third baffle 23 and the fourth baffle 24 have the same length and are both longer than the first baffle 21 and the second baffle 22. The first baffle 21, the second baffle 22, the third baffle 23, and the fourth baffle 24 are respectively provided with elongated first clearance holes 211, second clearance holes 221, third clearance holes 231, and fourth clearance holes 241, and the width of each hole allows the long arc-inducing plate 11 to pass through. The first clearance holes 211 and the second clearance holes 221 have the same length, and the lengths of the third clearance holes 231 and the fourth clearance holes 241 increase sequentially compared to the lengths of the first clearance holes 211 and the second clearance holes 221. In the arc-extinguishing baffle assembly 2, the clearance groove of the lower baffle is longer than that of the upper baffle. By utilizing the difference in the length of the clearance groove, the baffles of each layer can be slid in sequence, so as to realize the step-like opening and closing of the baffle assembly during the opening and closing process.

[0039] When the circuit is closed, the long arc-leading plate 11 contacts the stationary arc contact 4, and the short contact plate 12 contacts the stationary contact 5. The arc-extinguishing baffle assembly 2 slides under the action of the long arc-leading plate 11. The long arc-leading plate 11 stops sliding due to the restriction of the first clearance hole 211 and the second clearance hole 221, which also causes the first baffle 21 and the second baffle 22 to stop sliding. The third baffle 23 and the fourth baffle 24 are jointly restricted from sliding by the arc-extinguishing cover 31 and the third clearance hole 231 and the fourth clearance hole 241. When the circuit is closed, the long arc-leading plate 11 moves in the opposite direction. The position of the upper baffle is restricted by the long arc-leading plate 11, and the lower baffle stops after reaching the limit step, so that the right side of the arc-extinguishing baffle assembly 2 is distributed in a stepped manner. This method maintains the effective isolation between the upper and lower cavities while ensuring a compact structure and no additional space occupation in the closed state, and achieves synergistic optimization of space utilization and arc-extinguishing performance.

[0040] During the tripping operation, the long arc-leading piece 11 gradually separates from the stationary arc contact 4, and the long arc-leading piece 11 moves together with the moving contact 1 towards... Figure 2 As shown, when the circuit rotates to the right, the long arc-initiating plate 11 first drives the first baffle 21 and the second baffle 22 to slide through the first clearance hole 211 and the second clearance hole 221 of the arc-extinguishing baffle assembly 2. Then, it gradually drives the third baffle 23 and the fourth baffle 24 to slide through the third clearance hole 231 and the fourth clearance hole 241 until the moving contact 1 reaches the open position. When the circuit is opened, the long arc-initiating plate 11 moves to one side. Since the clearance groove of the lower baffle is longer than that of the upper baffle, the difference in the length of the clearance groove is used to drive the sliding of each layer of baffles in turn. This ensures that the left side of the baffle assembly remains closed during the unfolding process, preventing gas from leaking into the contact gap through the gap on the left side of the baffle assembly. This ensures that the airflow is concentrated to push the arc into the arc-extinguishing chamber 3, thus accelerating the arc extinguishing speed.

[0041] In some embodiments, the base 6 is an umbrella-like structure disposed on the inner wall of the lower cavity, thereby forming a spatial structure that is narrower at the top and wider at the bottom of the lower cavity. The base 6 being configured as an umbrella-like structure and situated on the inner wall of the lower cavity creates a spatial shape that is narrower at the top and wider at the bottom. This structure guides the arc-extinguishing airflow more concentratedly upwards into the arc-extinguishing chamber 3, reducing the diffusion and deposition of high-temperature gas in the lower contact area. Simultaneously, it increases the creepage distance on the surface of the insulating component, improves the insulation protection performance inside the switch, and reduces the risk of insulation degradation during long-term operation.

[0042] In some embodiments, the arc-extinguishing chamber 3 includes an arc-extinguishing cover 31. An angled limiting structure 301 is provided on one side of the arc-extinguishing cover 31 to limit the stroke of the long arc-drawing piece 11 and also to limit the rearward flow of gas within the arc-extinguishing chamber 3, preventing the gas from flowing downwards and backwards. When the moving contact 1 reaches the open position, the long arc-drawing piece 11 is stopped by the limiting structure 301. The angled limiting structure 301 on one side of the arc-extinguishing cover 31 provides a limit to the end point of the opening stroke of the long arc-drawing piece 11, preventing it from moving excessively backwards. It also seals the rear air passage of the arc-extinguishing chamber 3, limiting the rearward and downward flow of high-pressure gas, thus maintaining pressure and concentrating the arc energy within the arc-extinguishing chamber 3 for dissipation, promoting rapid arc entry into the arc-extinguishing chamber 3, and shortening the arc burning time. The lower part of the arc-extinguishing cover 31 is provided with a sliding groove 302 that cooperates with the arc-extinguishing baffle assembly 2. When the long arc-drawing piece 11 of the moving contact 1 rotates back and forth, it can drive the arc-extinguishing baffle assembly 2 to move along the sliding groove 302. The arc-extinguishing cover 31 has a groove on the other side relative to the limiting structure 301. The groove is located above the slide 302 and is used to limit, insulate, and seal the air passage of the stationary arc contact 4. The groove works in conjunction with the limiting structure 301 and the slide 302 to further enhance the airtightness and insulation strength of the end of the arc-extinguishing chamber 3, ensuring the stable performance of the air-blown arc extinguishing effect.

[0043] In some embodiments, the lower surface of the slide groove 302 is provided with a limiting step to block some of the baffles in the arc-extinguishing baffle assembly 2. The limiting step includes a first limiting step 303 and a second limiting step 304 arranged sequentially from top to bottom. When the circuit is closed, the third baffle 23 and the fourth baffle 24 are restricted from sliding by the first limiting step 303 and the second limiting step 304 on the lower surface of the slide groove 302 of the arc-extinguishing cover 31, as well as the third clearance hole 231 and the fourth clearance hole 241. The length of the first limiting step 303 is less than the length of the second limiting step 304. The slide groove 302, in conjunction with the limiting step, precisely controls the stopping position of each baffle, and works synergistically with the differentiated length design of the baffle clearance groove to jointly achieve reliable operation of the baffle assembly and effective isolation between the upper and lower cavities during the opening and closing process.

[0044] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A DC disconnect switch, characterized in that, include: A base is provided at the lower part of the DC disconnect switch. A stationary contact and a moving contact are respectively provided on both sides of the base. A stationary arc contact is provided above the stationary contact. A cavity-separated arc-extinguishing structure is installed on the upper part of a DC disconnecting switch. The cavity-separated arc-extinguishing structure includes a movable arc-extinguishing baffle assembly, which divides the cavity inside the DC disconnecting switch into upper and lower parts, and the arc-extinguishing baffle assembly and the upper cavity together form an arc-extinguishing chamber. The stationary arc contact is located on one side of the upper cavity, and the stationary contact and the moving contact are located on both sides of the lower cavity. The arc-extinguishing baffle assembly includes multiple baffles of different lengths, which are stacked sequentially according to their length. The long arc-leading piece of the moving contact passes through all the baffles of the arc-extinguishing baffle assembly and can drive the arc-extinguishing baffle assembly to move during the opening and closing process. During the movement, the arc-extinguishing baffle assembly changes into different stepped layered plate structures formed by multiple baffles, and always separates the upper and lower parts of the cavity.

2. The DC disconnect switch according to claim 1, characterized in that, The arc-extinguishing baffle assembly includes a first baffle, a second baffle, a third baffle, and a fourth baffle stacked sequentially from top to bottom. The first baffle and the second baffle have the same length, and the third baffle and the fourth baffle have the same length and are both longer than the first baffle and the second baffle.

3. The DC disconnect switch according to claim 2, characterized in that, The first baffle, the second baffle, the third baffle, and the fourth baffle are respectively provided with elongated first clearance holes, second clearance holes, third clearance holes, and fourth clearance holes, and the width of each of them allows the long arc-drawing piece to pass through. The lengths of the first clearance holes and the second clearance holes are the same, and the lengths of the third clearance holes and the fourth clearance holes increase sequentially compared to the lengths of the first clearance holes and the second clearance holes. When the circuit is closed, the arc-extinguishing baffle assembly slides under the action of the long arc-inducing plate. The long contact plate stops sliding due to the restriction of the first clearance hole and the second clearance hole, which also causes the first baffle and the second baffle to stop sliding. The third baffle and the fourth baffle are jointly restricted from sliding by the arc-extinguishing cover and the third clearance hole and the fourth clearance hole. When the circuit breaker is opened, the long arc-drawing plate first drives the first and second baffles to slide through the first and second clearance holes of the arc-extinguishing baffle, and then gradually drives the third and fourth baffles to slide through the third and fourth clearance holes until the moving contact reaches the opening position.

4. The DC disconnect switch according to claim 1, characterized in that, The base is an umbrella-shaped structure and is located on the inner wall of the lower cavity, thus forming a spatial structure that is narrow at the top and wide at the bottom of the lower cavity.

5. The DC disconnect switch according to any one of claims 1-4, characterized in that, The arc-extinguishing chamber includes an arc-extinguishing cover. An angular limiting structure is provided on one side inside the arc-extinguishing cover to limit the stroke of the long arc-drawing plate and also to limit the flow of gas in the arc-extinguishing chamber to the rear, thus preventing the gas from flowing downward and backward. When the moving contact reaches the open position, the long arc-drawing plate is stopped by the limiting structure.

6. The DC disconnect switch according to claim 5, characterized in that, The lower part of the arc-extinguishing cover is provided with a sliding groove that matches the arc-extinguishing baffle assembly. When the long arc-guiding plate of the moving contact rotates back and forth, it can drive the arc-extinguishing baffle assembly to move along the sliding groove.

7. The DC disconnect switch according to claim 6, characterized in that, The arc-extinguishing hood has a groove on the other side of the limiting structure. The groove is located above the slide groove and is used to limit, insulate, and seal the air passage of the static arc contact.

8. The DC disconnect switch according to claim 6, characterized in that, The lower surface of the chute is provided with a limiting step to block some of the baffles in the arc-extinguishing baffle assembly.

9. The DC disconnect switch according to claim 8, characterized in that, The limiting steps include a first limiting step and a second limiting step arranged sequentially from top to bottom. When the circuit is closed, the third baffle and the fourth baffle are restricted from sliding by the first limiting step and the second limiting step on the lower surface of the arc extinguishing cover's slide groove, as well as the third clearance hole and the fourth clearance hole.

10. The DC disconnect switch according to claim 9, characterized in that, The length of the first limiting step is less than the length of the second limiting step.

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