A direct current switch arc extinguishing chamber structure
By designing a DC switch arc extinguishing chamber structure, a simple and rapid arc extinguishing function is achieved by utilizing the movement of the rotating shaft and slider. This solves the problems of complex structure and high cost in existing technologies, and improves production efficiency and equipment reliability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI ANSHOU ELECTRIC APPLIANCE CO LTD
- Filing Date
- 2025-07-09
- Publication Date
- 2026-07-03
AI Technical Summary
Existing DC switches using vacuum mode in low voltage and current environments are costly and difficult to implement simple and rapid arc extinguishing functions. Existing arc extinguishing technologies are complex in structure, require high manufacturing precision, have a large number of parts, are costly, and are difficult to verify for reliability.
A DC switch arc-extinguishing chamber structure was designed. The movement of the connecting rod and slider is driven by the rotating shaft. The arc-extinguishing function is achieved by inserting an insulating sheet between the conductive rod and the terminal block. The manufacturing process is simplified by combining the vacuum sealing structure.
It achieves a simple and rapid arc extinguishing function in low voltage and current environments, reducing manufacturing difficulty and cost, and improving production efficiency and equipment reliability.
Smart Images
Figure CN224458012U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of electrical component technology, and in particular to a DC switch arc extinguishing chamber structure. Background Technology
[0002] In power systems and electrical equipment, DC switches, as key control components, directly impact power supply reliability and equipment safety. DC switch arc extinguishing technology, as its core function, bears the crucial responsibility of interrupting fault currents and protecting equipment safety. Because DC current lacks a natural zero-crossing point, extinguishing an arc is far more difficult than in AC systems, making arc extinguishing capability a core indicator of the advancement of DC switch technology. I. The Destructive Nature of DC Arcs and the Necessity of Arc Extinguishing: DC arcs are characterized by high temperatures (up to tens of thousands of degrees Celsius), long durations, and concentrated energy. Unextinguished arcs can lead to switch contact erosion, accelerated aging of insulation materials, and even short-circuit explosions. In scenarios such as high-voltage DC transmission and new energy power generation, system short-circuit currents can reach tens of thousands of amperes; failure to extinguish arcs can result in catastrophic consequences. Therefore, the reliability of arc extinguishing devices is directly related to the stable operation of the power system and the service life of equipment. II. The Structural Complexity of Existing Arc Extinguishing Technologies: Current mainstream arc extinguishing technologies generally suffer from complex structures and high process requirements. Taking magnetic blowout arc extinguishing devices as an example, a composite magnetic field system consisting of permanent magnets, arc guide grids, and electromagnetic coils is required, and each component needs precise spatial alignment. While multi-breakpoint series arc extinguishing technology can improve breaking capacity, each additional breakpoint requires a matching mechanical linkage mechanism and insulating support structure, leading to an exponential increase in switch size. Gas arc extinguishing switches rely on complex sealed cavities, air pump systems, and airflow control valves, placing stringent requirements on manufacturing precision and material performance. III. Production Challenges Arising from Complex Structures: High Manufacturing Precision Requirements: The magnetic pole alignment error of the magnetic blowout arc extinguishing system must be controlled within 0.1mm, and the arc guide grid spacing tolerance must not exceed 5%, placing extremely high demands on stamping dies and assembly processes. Increased Number of Components: A certain type of DC circuit breaker arc extinguishing chamber contains 132 independent parts, nearly 80% more than an AC switch, significantly increasing production cycle time and quality control difficulty. Rising Material Costs: The cost of key materials such as arc-resistant copper-tungsten alloy contacts and special ceramic insulators accounts for more than 40% of the total cost. Reliability verification is challenging: the multi-layered arc-extinguishing chamber structure necessitates specialized equipment for fault diagnosis and lifespan testing, extending product development cycles. IV. Technological Development Directions: The industry is exploring new technological pathways based on vacuum arc extinguishing and solid-state switches. Vacuum arc-extinguishing chambers suppress arcs through a high-vacuum environment, reducing mechanical components by 80%; silicon carbide solid-state DC switches completely eliminate mechanical contacts, fundamentally eliminating arc generation. These innovations are expected to overcome the structural limitations of traditional arc-extinguishing technologies, but currently still face challenges in manufacturing costs and heat dissipation design. With the rapid development of DC power grids, simplifying arc-extinguishing structures and improving production economics have become urgent industry needs. This requires collaborative breakthroughs in materials science, precision manufacturing, and power electronics technologies to drive the evolution of DC switches towards modularization and solid-state technology, achieving large-scale production while ensuring arc-extinguishing performance.
[0003] The above-mentioned existing technical solutions have the following drawbacks: When using DC switches in some low voltage and current environments, the vacuum mode is not convenient for practical use, and its cost is high. Testing is also a challenge. Therefore, it is still necessary to achieve the simple and fast arc extinguishing function inside the DC switch in a mechanical way. Utility Model Content
[0004] The purpose of this invention is to provide a DC switch arc extinguishing chamber structure to solve the problems existing in the prior art.
[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:
[0006] A DC switch arc extinguishing chamber structure includes an outer shell. Terminals are provided on both the left and right sides of the outer shell. A through groove is provided at the bottom of the outer shell, communicating with the interior of the outer shell. A slider is slidably mounted inside the outer shell, with its bottom end passing through the through groove and extending to the outside of the groove. A mounting hole is provided at the center of the front side of the outer shell, and a rotating shaft is installed within the mounting hole. A connecting rod is sleeved on the middle section of the rotating shaft, with its rear end inside the outer shell and its front end outside the outer shell. A conductive rod is fixedly mounted at the end of the connecting rod inside the outer shell. Terminals are symmetrically arranged on the left and right sides of the inner bottom of the outer shell. An insulating sheet is fixedly mounted at the top of the slider inside the outer shell.
[0007] By adopting the above technical solution, the rotation of the shaft enables the conductive rod inside the housing to move closer to or further away from the terminal block when the connecting rod is moved, thus achieving the on / off function. By sliding the slider, the insulating sheet is inserted into the position where the conductive rod and the terminal block are in contact, forcibly isolating the conductive rod and the terminal block, thus achieving the arc extinguishing function.
[0008] In a further embodiment, sleeves are rotatably mounted on both ends of the rotating shaft, an annular groove is provided in the middle of the sleeve, a rectangular protrusion is provided on the rotating shaft located in the annular groove, and a rectangular protrusion is provided in the annular groove.
[0009] By adopting the above technical solution, when the rectangular bump and the rectangular protrusion are locked together, the rotating shaft will drive the sleeve to rotate together through the connecting rod. When the rectangular bump and the rectangular protrusion separate, the rotating shaft will not rotate the sleeve.
[0010] In a further embodiment, one end of a lever located inside the housing is fixedly mounted on the sleeve, and the other end of the lever is configured as a hook shape. A crossbar located inside the housing is fixedly mounted on the slider, and the hook of the lever is used to hook the crossbar.
[0011] By adopting the above technical solution, when the connecting rod is rotated, causing one end of the connecting rod located in the outer shell to press down, the other end of the connecting rod located inside the outer shell rises. At this time, the rectangular protrusion and the rectangular block abut against each other, causing the end of the lever away from the sleeve to also rise. Because the hook of the lever reaches the crossbar, the crossbar will also move upward, which will drive the slider to move upward. The insulating sheet at the top of the slider is inserted into the area between the conductive rod and the terminal block, which plays a role in blocking the electric arc and avoids the need to manually push the slider, making the operation of the device simpler.
[0012] In a further embodiment, the connecting rod is made of insulating material, the middle section of the rotating shaft is fitted with an insulating sleeve, and the middle section of the connecting rod is fitted onto the insulating sleeve.
[0013] In a further embodiment, a sealing cover is fixedly installed at the bottom of the housing, the sealing cover being used to seal the through groove at the bottom of the housing.
[0014] In a further embodiment, the mounting hole on the front side of the housing of the terminal block is filled with a vacuum sealing strip.
[0015] In summary, this utility model has the following beneficial effects:
[0016] 1. By rotating the shaft, when the connecting rod is actuated, the conductive rod inside the housing moves closer to or further away from the terminal block, thus achieving the on / off function. By sliding the slider, the insulating sheet is inserted into the position where the conductive rod and the terminal block are in contact, forcibly isolating the conductive rod and the terminal block, thus achieving the effect of arc extinguishing. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0018] Figure 2 This is a schematic diagram illustrating the structure of the sleeve and rotating shaft of this utility model;
[0019] Figure 3 This is a schematic diagram illustrating the fit between the sleeve and the rotating shaft in this utility model.
[0020] In the diagram, 1 is the outer casing; 2 is the terminal block; 3 is the slider; 4 is the shaft; 5 is the connecting rod; 6 is the conductive rod; 7 is the insulating sheet; 8 is the sleeve; 9 is the lever; and 10 is the insulating sleeve. Detailed Implementation
[0021] The present invention will be further described in detail below with reference to the accompanying drawings.
[0022] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.
[0023] Example 1:
[0024] like Figures 1-3 As shown, a DC switch arc extinguishing chamber structure includes a housing 1. Terminal posts 2 are provided on both the left and right sides of the housing 1. A through groove is provided at the bottom of the housing 1, communicating with the interior of the housing 1. A slider 3 is slidably mounted inside the housing 1, with its bottom end passing through the through groove and extending to the outside of the groove. A mounting hole is provided at the center of the front side of the housing 1, and a rotating shaft 4 is installed in the mounting hole. A connecting rod 5 is sleeved in the middle section of the rotating shaft 4. The rear end of the connecting rod 5 is located inside the housing 1, and the front end of the connecting rod 5 is located outside the housing 1. A conductive rod 6 is fixedly installed at the end of the connecting rod 5 inside the housing 1. Terminal posts 2 are symmetrically arranged on the left and right sides of the bottom inner side of the housing 1. The slider 3 is fixedly installed at the top inside the housing 1. There is an insulating sheet 7; both ends of the rotating shaft 4 are rotatably mounted with sleeves 8, and an annular groove is provided in the middle of the sleeve 8. A rectangular protrusion is provided on the rotating shaft 4 in the annular groove, and a rectangular protrusion is provided in the annular groove; one end of a lever 9 located inside the outer shell 1 is fixedly mounted on the sleeve 8, and the other end of the lever 9 is shaped like a hook. A crossbar located inside the outer shell 1 is fixedly mounted on the slider 3, and the hook of the lever 9 is used to hook the crossbar; the connecting rod 5 is made of insulating material, and an insulating sleeve 10 is sleeved on the middle section of the rotating shaft 4. The middle section of the connecting rod 5 is sleeved on the insulating sleeve 10; a sealing cover is fixedly mounted on the bottom of the outer shell 1, and the sealing cover is used to seal the through groove at the bottom of the outer shell 1; the mounting hole on the front side of the outer shell 1 of the terminal 2 is filled with a vacuum sealing strip.
[0025] Specific implementation process: When the connecting rod is rotated, causing one end of the connecting rod located in the outer shell to press down, the other end of the connecting rod located inside the outer shell rises. At this time, the rectangular protrusion and the rectangular block lock together, causing the end of the lever away from the sleeve to also rise. Because the hook of the lever reaches the crossbar, the crossbar will also move upward, which drives the slider to move upward. The insulating sheet at the top of the slider is inserted into the area between the conductive rod and the terminal block, which plays a role in blocking the electric arc and avoids the need to manually push the slider, making the operation of the device simpler.
[0026] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.
[0027] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.
Claims
1. A direct current switch arc quenching chamber structure, characterized by: The enclosure includes a housing (1), with terminals (2) provided on both the left and right sides of the housing (1). A through groove is provided at the bottom of the housing (1), which communicates with the interior of the housing (1). A slider (3) is installed inside the housing (1) and slides up and down. The bottom end of the slider (3) passes through the through groove and extends to the outside of the through groove. A mounting hole is provided at the center of the front side of the housing (1), and a rotating shaft (4) is installed in the mounting hole. A connecting rod (5) is sleeved in the middle section of the rotating shaft (4). The rear end of the connecting rod (5) is located inside the housing (1), and the front end of the connecting rod (5) is located outside the housing (1). A conductive rod (6) is fixedly installed at the end of the connecting rod (5) inside the housing (1). Terminals (2) are symmetrically provided on the left and right sides of the bottom of the housing (1). An insulating sheet (7) is fixedly installed at the top of the slider (3) inside the housing (1).
2. The DC switch arc-extinguishing chamber structure according to claim 1, characterized in that: Both ends of the rotating shaft (4) are rotatably mounted with sleeves (8). An annular groove is provided in the middle of the inner part of the sleeve (8). A rectangular protrusion is provided on the rotating shaft (4) located in the annular groove. A rectangular protrusion is provided in the annular groove.
3. A DC switch arc quenching chamber structure according to claim 2, characterized in that: One end of a lever (9) located inside the outer shell (1) is fixedly installed on the sleeve (8), and the other end of the lever (9) is configured as a hook shape. A crossbar located inside the outer shell (1) is fixedly installed on the slider (3), and the hook of the lever (9) is used to hook the crossbar.
4. The DC switch arc quenching chamber structure of claim 1, wherein: The connecting rod (5) is made of insulating material, and the middle section of the rotating shaft (4) is fitted with an insulating sleeve (10). The middle section of the connecting rod (5) is fitted on the insulating sleeve (10).
5. The DC switch arc quenching chamber structure of claim 1, wherein: A sealing cover is fixedly installed at the bottom of the outer casing (1), and the sealing cover is used to seal the through groove at the bottom of the outer casing (1).
6. The DC switch arc quenching chamber structure of claim 1, wherein: The mounting hole on the front side of the housing (1) of the terminal block (2) is filled with a vacuum sealing strip.