A static contact assembly based on shunt and arc guiding structure
By introducing a current shunting and arc guiding structure into the stationary contact assembly, the rapid guidance and transfer of the electric arc is achieved, solving the ablation problem caused by arc retention and improving the conductivity of the stationary contact and the stability of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG YINDE ELECTRICIAN ALLOY CO LTD
- Filing Date
- 2025-08-19
- Publication Date
- 2026-07-21
AI Technical Summary
Existing static contact assemblies have a long arc dwell time during the breaking process, which leads to severe contact erosion and decreased conductivity. In addition, they lack anti-rotation and anti-displacement designs, which affect the stability of the equipment.
It adopts a current diversion and arc guiding structure, including a stationary contact plate, stationary contact point and arc guiding sleeve. Through the silver-coated arc ignition channel, arc ignition column of arc guiding sleeve and limiting structure, it realizes the rapid guidance and transfer of electric arc and prevents position deviation.
It effectively reduces the residence time of electric arc on the silver-coated layer, reduces ablation, improves conductivity stability and service life, and ensures the stability of electrical connections.
Smart Images
Figure CN224536908U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a static contact assembly based on a current splitting and arc guiding structure. Background Technology
[0002] Stationary contact assemblies are one of the core conductive components in low-voltage electrical appliances such as circuit breakers and contactors. Their main function is to conduct or cut off current during the connection or disconnection of the moving and stationary contacts. Because a high-temperature arc is generated between the contacts during the disconnection process, if the arc remains on the contact surface for a prolonged period, it can cause contact erosion, welding, or deformation, thus affecting conductivity and service life. Therefore, effectively guiding and transferring the arc at the moment of contact disconnection is one of the key technologies in the design of stationary contact assemblies. Existing stationary contact assemblies generally suffer from the following problems: 1. Traditional static contact components mostly rely on the natural stretching and extinguishing of the arc by the contact gap, lacking a targeted arc ignition and transfer structure, resulting in a long arc residence time at the contact interface, severe ablation, and shortened contact life.
[0003] 2. The existing contact surface is affected by arc impact in localized areas, which can easily cause localized overheating and rapid burning of the silver coating, resulting in a significant decrease in conductivity.
[0004] 3. Some contact assemblies equipped with arc guiding structures lack anti-rotation and anti-displacement designs. Under equipment operation vibration conditions, the arc guiding components are prone to positional displacement, affecting the matching between the arc ignition channel and the arc position, and reducing the protection effect. Utility Model Content
[0005] To solve the above problems, the technical problem to be solved by this utility model is to provide a static contact assembly based on a current diversion and arc guiding structure.
[0006] The technical solution adopted by the static contact assembly based on the current splitting and arc guiding structure of this utility model is characterized by comprising a static contact plate, a static contact, and an arc guiding sleeve. The static contact plate includes a static contact plate mounting part, and the two ends of the static contact plate mounting part extend horizontally to form static contact plate mating parts. The static contact plate mating parts are provided with static contact plate mating holes. The static contact includes a static contact body and a static contact silver-plated layer. The static contact body includes a static contact receiving part and a static contact riveting post provided at the bottom of the static contact receiving part. The static contact silver-plated layer includes a silver-plated layer body that contacts the moving contact and a silver-plated layer outer edge provided around the silver-plated layer body. The arc guiding sleeve includes an arc guiding sleeve receiving part. The arc-guiding posts of the arc-guiding sleeve are arranged at intervals around the arc-guiding sleeve receiving part. The inner wall of the upper end of the arc-guiding post of the arc-guiding sleeve is provided with an arc-guiding protrusion. The stationary contact receiving part is provided with a stationary contact limiting port for limiting the arc-guiding posts of the arc-guiding sleeve. The upper surface of the arc-guiding post of the arc-guiding sleeve is at the same level as the upper surface of the outer edge of the silver-plated layer. The outer edge of the silver-plated layer is provided with a silver-plated layer arc-guiding channel corresponding to the arc-guiding protrusion. The middle part of the arc-guiding sleeve receiving part is provided with an arc-guiding sleeve through hole. The stationary contact riveting post passes through the arc-guiding sleeve through hole and is riveted into the docking hole of the stationary contact plate.
[0007] The silver-coated arc-inducing channel has a funnel-shaped structure, with its width being wider on the inside and narrower on the outside.
[0008] The number of arc-guiding columns in the arc-guiding sleeve is four.
[0009] The arc-drawing protrusion has a wedge-shaped structure.
[0010] The bottom of the arc sleeve receiving part is provided with an arc sleeve anti-rotation boss outside the arc sleeve through hole, and the stationary contact plate docking part is provided with a stationary contact plate anti-rotation groove at the stationary contact plate docking hole that is opposite to the arc sleeve anti-rotation boss.
[0011] The static contact plate mounting part is provided with a static contact plate positioning hole in the middle, and static contact plate limiting recesses are provided at the front and rear ends of the static contact plate mounting part.
[0012] The advantages of this utility model of a static contact assembly based on a current shunting and arc guiding structure are as follows: the addition of an arc guiding sleeve and its arc guiding sleeve arc ignition post, combined with the arc ignition protrusion and the silver-coated layer arc ignition channel, realizes the rapid guidance and transfer of the electric arc at the moment of separation between the static contact and the moving contact, reduces the residence time of the electric arc on the silver-coated layer body, effectively reduces ablation, and extends the contact life. Attached Figure Description
[0013] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0014] Figure 1 This is a schematic diagram of the static contact assembly based on the current diversion and arc guiding structure of this utility model; Figure 2This is a schematic diagram of the structure of the static contact plate of this utility model; Figure 3 This is a schematic diagram of the static contact of this utility model; Figure 4 This is a front structural diagram of the arc guide sleeve of this utility model; Figure 5 This is a schematic diagram of the back structure of the arc guide sleeve of this utility model. Detailed Implementation
[0015] like Figure 1-5 As shown, the static contact assembly based on a current splitting and arc guiding structure of this utility model includes a static contact plate 1, a static contact 2, and an arc guiding sleeve 3. The static contact plate 1 includes a static contact plate mounting portion 5, and the two ends of the static contact plate mounting portion 5 extend horizontally to form static contact plate mating portions 6. The static contact plate mating portions 6 are provided with static contact plate mating holes 7. The static contact 2 includes a static contact body 8 and a static contact silver-coated layer 9. The static contact body 8 includes a static contact receiving portion 10 and a portion disposed on the... The static contact receiving part 10 has a static contact riveting post 11 at its bottom. The static contact silver-plated layer 9 includes a silver-plated layer body 12 that contacts the moving contact and a silver-plated layer outer edge 13 located around the silver-plated layer body 12. The arc guide sleeve 3 includes an arc guide sleeve receiving part 17 and an arc guide sleeve arc-inducing post 18 spaced around the arc guide sleeve receiving part 17. The upper inner wall of the arc guide sleeve arc-inducing post 18 is provided with an arc-inducing protrusion 20. The static contact receiving part 10 is provided with... A stationary contact limiting port 14 is provided for limiting the arc-initiating post 18 of the arc-guided sleeve. The upper surface of the arc-initiating post 18 of the arc-guided sleeve is on the same horizontal plane as the upper surface of the outer edge 13 of the silver-coated layer, so that the arc distribution is more uniform, reducing local overheating, further reducing the probability of burn-off of the silver-coated layer body 12, and improving the conductivity stability and service life of the contact. The outer edge 13 of the silver-coated layer is provided with a silver-coated layer arc-initiating channel 15 corresponding to the arc-initiating protrusion 20. The middle part of the arc-guided sleeve receiving part 17 is provided with an arc-guided sleeve through hole 19. The stationary contact riveting post 11 passes through the arc-guided sleeve through hole 19 and is riveted into the stationary contact plate docking hole 7. By adding the arc-guided sleeve 3 and its arc-initiating post 18, in conjunction with the arc-initiating protrusion 20 and the silver-coated layer arc-initiating channel 15, the rapid guidance and transfer of the arc at the moment of separation between the stationary contact 2 and the moving contact is realized, reducing the residence time of the arc on the silver-coated layer body 12, effectively reducing ablation, and extending the contact life.
[0016] The silver-coated arc-initiating channel 15 has a trumpet-shaped structure with a width that is wider at the inside and narrower at the outside. This allows the arc to be attracted and guided more smoothly to the arc-initiating column 18, reducing arc rebound and random movement, and improving arc control.
[0017] The arc-guiding sleeve has four arc-initiating columns 18, which can effectively capture and guide the electric arc in multiple directions, adapt to different arc generation positions, and improve the all-round protection.
[0018] The arc-inducing protrusion 20 has a wedge-shaped structure, which has good arc attraction and deflection characteristics. It can quickly pull the arc away from the contact interface, reduce the direct impact of the arc on the contact surface, and improve the reliability of the break.
[0019] The bottom of the arc sleeve receiving part 17 is provided with an arc sleeve anti-rotation boss 22 outside the arc sleeve through hole 19. The stationary contact plate docking part 6 is provided with a stationary contact plate anti-rotation groove 26 at the stationary contact plate docking hole 7, which is opposite to the arc sleeve anti-rotation boss 22. This prevents the arc sleeve 3 from rotating during operation vibration, ensures that the arc ignition channel and the arc direction are matched, and improves long-term stability.
[0020] The stationary contact plate mounting part 5 has a stationary contact plate positioning hole 24 in the middle and stationary contact plate limiting recesses 25 at the front and rear ends. It can achieve precise positioning during assembly, prevent the contact assembly from shifting axially or radially during equipment operation, and ensure the stability of electrical connection.
[0021] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model are included within the protection scope of the present utility model.
Claims
1. A static contact assembly based on a current shunting and arc guiding structure, characterized in that: The system includes a stationary contact plate (1), a stationary contact point (2), and an arc guide sleeve (3). The stationary contact plate (1) includes a stationary contact plate mounting part (5), which extends horizontally at both ends to form a stationary contact plate mating part (6). The stationary contact plate mating part (6) is provided with a stationary contact plate mating hole (7). The stationary contact point (2) includes a stationary contact point body (8) and a stationary contact point silver-plated layer (9). The stationary contact point body (8) includes a stationary contact point receiving part (10) and a stationary contact point riveting post (11) located at the bottom of the stationary contact point receiving part (10). The stationary contact point silver-plated layer (9) includes a silver-plated layer body (12) that contacts the moving contact and a silver-plated layer outer edge (13) located around the silver-plated layer body (12). The arc guide sleeve (3) includes an arc guide sleeve receiving part (17). The arc-guiding post (18) is provided on the arc-guiding sleeve receiving part (17) at intervals around the arc. The inner wall of the upper end of the arc-guiding post (18) is provided with an arc-guiding protrusion (20). The stationary contact receiving part (10) is provided with a stationary contact limiting port (14) for limiting the arc-guiding post (18). The upper surface of the arc-guiding post (18) is on the same horizontal plane as the upper surface of the outer edge (13) of the silver layer. The outer edge (13) of the silver layer is provided with a silver layer arc-guiding channel (15) corresponding to the arc-guiding protrusion (20). The middle part of the arc-guiding sleeve receiving part (17) is provided with an arc-guiding sleeve through hole (19). The stationary contact riveting post (11) passes through the arc-guiding sleeve through hole (19) and is riveted into the stationary contact plate docking hole (7).
2. The static contact assembly based on a current shunting and arc guiding structure according to claim 1, characterized in that: The silver-coated arc-leading channel (15) has a funnel-shaped structure with a width that is wider on the inside and narrower on the outside.
3. The static contact assembly based on a current shunting and arc guiding structure according to claim 1, characterized in that: The number of the arc-guiding columns (18) is four.
4. The static contact assembly based on the current splitting and arc guiding structure according to claim 1, characterized in that: The arc-leading protrusion (20) has a wedge-shaped structure.
5. The static contact assembly based on a current shunting and arc guiding structure according to claim 1, characterized in that: The bottom of the arc sleeve receiving part (17) is provided with an arc sleeve anti-rotation boss (22) outside the arc sleeve through hole (19), and the stationary contact plate docking part (6) is provided with a stationary contact plate anti-rotation groove (26) at the stationary contact plate docking hole (7) that is in contact with the arc sleeve anti-rotation boss (22).
6. The static contact assembly based on a current shunting and arc guiding structure according to claim 1, characterized in that: The static touch plate mounting part (5) is provided with a static touch plate positioning hole (24) in the middle, and static touch plate limiting recesses (25) are provided at the front and rear ends of the static touch plate mounting part (5).