A DC contactor with an arc-extinguishing structure

Abstract

This application discloses a DC contactor with an arc-extinguishing structure, belonging to the field of DC contactor technology. It includes a DC contactor housing. The design is novel and the device ingenious. By plating the contacts to isolate them from air oxidation, a sealed structure is used in low-pressure or corrosive environments. An inert gas-filled contact box is added to prevent contact surface corrosion and improve contact lifespan. Metal grids (dividing the arc into multiple segments, each with a voltage lower than the arc voltage) or insulating partitions (cooling the arc) accelerate arc energy dissipation. Combined with electronic control technology, an intelligent disconnector is added to detect the current zero-crossing point and trigger the disconnection action. The low arc energy at the natural zero-crossing of the AC current quickly extinguishes the arc, shortening the extinguishing time. Sensors (such as temperature and current sensors) are installed to monitor the contact status in real time. When contact resistance increases or temperature becomes too high, a timely warning is issued or the circuit automatically disconnects to prevent the fault from escalating.

Description

Technical Field

[0001] This application relates to the field of DC contactor technology, and more particularly to a DC contactor with an arc-extinguishing structure. Background Technology

[0002] A DC contactor is a contactor controlled by a DC coil with a DC core. Its load can be DC or AC. The core of a DC contactor differs from that of an AC contactor; it does not have eddy currents. Therefore, it is generally made of mild steel or industrial pure iron in a circular shape. Because the attraction coil of a DC contactor is powered by DC, there is no inrush starting current, and the core will not experience violent impact. As a result, it has a long lifespan and is suitable for applications with frequent start-stop cycles. The selection of AC or DC contactors can be found in the electrical product catalog based on the operating voltage and current of the circuit.

[0003] The contactor adopts a modular design, which can be assembled with the fewest parts to meet the required number of contact circuits and contact types (normally open, normally closed, and changeover). It has a high contact breaking voltage and uses a cross-blowing magnetic field to extinguish the arc. The maximum breaking voltage can reach 220VDC. It is suitable for programmable power supply or uninterruptible power supply systems, forklifts, electric vehicles, and construction machinery systems.

[0004] However, when breaking a high-voltage, high-current DC circuit, the arc energy is large, which makes it difficult to extinguish quickly, resulting in short contact life, long extinguishing time, and low efficiency.

[0005] Therefore, this application proposes a DC contactor with an arc-extinguishing structure. Utility Model Content

[0006] This application proposes a DC contactor with an arc-extinguishing structure to solve the problems mentioned in the background art. By plating the contacts to isolate them from air oxidation, a sealed structure is adopted in low-pressure or corrosive environments, and an inert gas-filled contact box is added to prevent contact surface corrosion and improve contact life. By setting metal grids (dividing the arc into multiple segments, each with a voltage lower than the arc voltage) or insulating partitions (cooling the arc), the arc energy dissipation is accelerated. Combined with electronic control technology, an intelligent disconnector is added to detect the current zero-crossing point and trigger the disconnection action. The low arc energy at the natural zero-crossing of the AC current is used to quickly extinguish the arc, shortening the extinguishing time. Sensors (such as temperature sensors and current sensors) are added to monitor the contact status in real time. When the contact resistance increases or the temperature is too high, an early warning is issued or the circuit is automatically disconnected to avoid the fault from spreading and improve efficiency.

[0007] To achieve the above objectives, this application adopts the following technical solution: A DC contactor with an arc-extinguishing structure includes a DC contactor housing, a bushing, a moving iron core, a copper coil, a coil cover plate, a magnet, a ceramic cover, a stationary contact, a combined armature, a moving contact, a shaft, metal grid plates, an intelligent disconnector, and a sensor. The magnet is divided into two chambers by magnetic pole plates. The drive mechanism and the contact system are located in different chambers in the DC contactor housing. The chamber containing the contact system is a sealed chamber. The contact system includes a stationary contact and a moving contact. The magnet is disposed inside the sealed chamber and on opposite sides of the outer periphery of the moving contact. The ceramic cover is disposed inside the sealed chamber and inside the magnet.

[0008] In a preferred embodiment, the stationary contact and the moving contact are plated, such as with nickel or gold. By plating the contacts (such as with nickel or gold), oxidation from the air is prevented, thus improving the practicality of the device.

[0009] In a preferred embodiment, a contact box is provided on the outside of the moving contact and located within the sealed cavity; By employing a sealed structure and adding a contact box filled with inert gas in low-pressure or corrosive environments, corrosion of the contact surface is prevented, and the service life of the contacts is improved, thereby enhancing the practicality of the device.

[0010] In a preferred embodiment, the metal grid is disposed inside the sealed chamber and above the moving contact; By setting up metal grids (to divide the electric arc into multiple segments, each with a voltage lower than the arcing voltage) or insulating partitions (to cool the electric arc), the dissipation of arc energy is accelerated, thereby improving the practicality of the device.

[0011] In a preferred embodiment, the intelligent disconnector is disposed inside the sealed chamber and located below the moving contact; By incorporating electronic control technology and adding an intelligent circuit breaker, the device detects the current crossing zero point and triggers the disconnection action. It utilizes the low arc energy when the AC current naturally crosses zero to quickly extinguish the arc, shortening the extinguishing time. This solves the problem of large arc energy and difficulty in quickly extinguishing the arc when interrupting high-voltage, high-current DC circuits, thereby improving the practicality of the device.

[0012] In a preferred embodiment, the sensor is disposed inside the sealed chamber and located below the moving contact on the side away from the intelligent disconnector; By adding sensors (such as temperature sensors and current sensors) to monitor the contact status in real time, when the contact resistance increases or the temperature is too high, a warning is issued in time or the device is automatically disconnected to avoid the fault from escalating, improve efficiency, and thus enhance the practicality of the device.

[0013] The beneficial effects of this application are: 1. This DC contactor with an arc-extinguishing structure, by plating the contacts (such as nickel plating or gold plating) to prevent air oxidation, adopts a sealed structure in low-pressure or corrosive environments, and adds a contact box filled with inert gas to prevent corrosion of the contact surface, improve the service life of the contacts, and greatly enhance the practicality of the device. 2. This DC contactor with an arc-extinguishing structure accelerates the dissipation of arc energy by setting metal grids (dividing the arc into multiple segments, each with a voltage lower than the arc voltage) or insulating partitions (cooling the arc). Combined with electronic control technology, an intelligent disconnector is added to detect the current zero-crossing point and trigger the disconnection action. It utilizes the low arc energy when the AC current naturally crosses zero to quickly extinguish the arc, shortening the extinguishing time. This solves the problem of large arc energy and difficulty in quickly extinguishing the arc during high-voltage, high-current DC disconnection. By adding sensors (such as temperature sensors and current sensors) to monitor the contact status in real time, when the contact resistance increases or the temperature is too high, a warning is issued in time or the device automatically disconnects to avoid the fault from expanding, improve efficiency, and greatly enhance the practicality of the device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the device in this application; Figure 2 This is a schematic diagram of the internal structure of the device in this application; Figure 3 For this application Figure 2 Enlarged view of point A in the middle; Figure 4 For this application Figure 2 Enlarged view of section B in the middle.

[0015] The following are the labels in the diagram: 1. Bushing; 2. Moving iron core; 3. Copper coil; 4. Coil cover plate; 5. Magnet; 6. Ceramic cover; 7. Stationary contact; 8. Combined armature; 9. Moving contact; 10. Shaft; 11. Contact box; 12. Metal grid; 13. Intelligent circuit breaker; 14. Sensor; 15. DC contactor housing. Detailed Implementation

[0016] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0017] Reference Figure 1-4A DC contactor with an arc-extinguishing structure includes a DC contactor housing 15, a bushing 1, a moving iron core 2, a copper coil 3, a coil cover plate 4, a magnet 5, a ceramic cover 6, a stationary contact 7, a combined armature 8, a moving contact 9, a shaft 10, a metal grid 12, an intelligent disconnector 13, and a sensor 14. The magnet 5 is divided into two chambers by magnetic pole plates. The drive mechanism and the contact system are located in different chambers in the DC contactor housing 15. The chamber where the contact system is located is a sealed chamber. The contact system includes a stationary contact 7 and a moving contact 9. The magnet 5 is located inside the sealed chamber and on opposite sides of the outer periphery of the moving contact 9. The ceramic cover 6 is located inside the sealed chamber and inside the magnet 5.

[0018] Reference Figure 2-4 The stationary contact 7 and the moving contact 9 are plated, such as with nickel or gold. By plating the contacts (such as with nickel or gold), oxidation from the air is prevented, thereby improving the practicality of the device.

[0019] Reference Figure 2-3 A contact box 11 is provided on the outside of the moving contact 9 and in the sealed cavity. By adopting a sealed structure and adding a contact box 11 filled with inert gas in a low-pressure or corrosive environment, corrosion of the contact surface is prevented, the service life of the contact is improved, and thus the practicality of the device is enhanced.

[0020] Reference Figure 2-4 The metal grid 12 is disposed inside the sealed chamber and above the moving contact 9; by setting the metal grid 12 (to divide the electric arc into multiple segments, each segment having a voltage lower than the arc voltage) or the insulating partition (to cool the electric arc), the energy dissipation of the electric arc is accelerated, thereby improving the practicality of the device.

[0021] Reference Figure 2-3 The intelligent circuit breaker 13 is installed inside the sealed chamber and below the moving contact 9. By combining with electronic control technology, the intelligent circuit breaker 13 is added to detect the current zero crossing point and trigger the disconnection action. It uses the low arc energy when the AC current naturally crosses zero to quickly extinguish the arc, shorten the extinguishing time, and solve the problem of large arc energy and difficulty in quickly extinguishing the arc when breaking high voltage and high current DC, thereby improving the practicality of the device.

[0022] Reference Figure 2-3 The sensor 14 is installed inside the sealed chamber and located below the moving contact 9 on the side away from the intelligent disconnector 13. By installing the sensor 14 (such as a temperature sensor or a current sensor), the contact status is monitored in real time. When the contact resistance increases or the temperature is too high, an early warning is issued or the device is automatically disconnected in time to avoid the fault from expanding and improve efficiency, thereby enhancing the practicality of the device.

[0023] Working principle: The stationary contact 7 and the moving contact 9 are made of silver-based alloys (such as AgCdO, AgSnO2) or copper-based composite materials (such as CuCr), which have high conductivity, high temperature resistance and arc erosion resistance. By plating the contacts (such as nickel plating or gold plating), air oxidation is isolated. In low-pressure or corrosive environments, a sealed structure is used, and an inert gas-filled contact box 11 is added to prevent contact surface corrosion and improve contact life. A metal grid 12 is installed (dividing the arc into multiple segments, each with a voltage lower than the arc voltage) or... An insulating partition (cooling arc) accelerates the dissipation of arc energy. Combined with electronic control technology, an intelligent circuit breaker 13 is added to detect the current zero-crossing point and trigger the disconnection action. It utilizes the low arc energy when the AC current naturally crosses zero to quickly extinguish the arc, shortening the extinguishing time and solving the problem of large arc energy and difficulty in quickly extinguishing it when interrupting high voltage and high current DC. By adding sensors 14 (such as temperature sensors and current sensors), the contact status is monitored in real time. When the contact resistance increases or the temperature is too high, an early warning is issued or the circuit is automatically disconnected in time to avoid the fault from expanding and improve efficiency.

[0024] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this application, based on the technical solution and the inventive concept of this application, should be included within the scope of protection of this application.

Claims

1. A DC contactor with an arc-extinguishing structure, comprising a DC contactor housing (15), a bushing (1), a moving iron core (2), a copper coil (3), a coil cover plate (4), a magnet (5), a ceramic cover (6), a stationary contact (7), a combined armature (8), a moving contact (9), a shaft (10), a metal grid (12), an intelligent disconnector (13), and a sensor (14), characterized in that, The magnet (5) is divided into two chambers by magnetic pole plates. The drive mechanism and the contact system are located in different chambers in the DC contactor housing (15). The chamber where the contact system is located is a sealed chamber. The contact system includes a stationary contact (7) and a moving contact (9). The magnet (5) is located inside the sealed chamber and on opposite sides of the outer periphery of the moving contact (9). The ceramic cover (6) is located inside the sealed chamber and inside the magnet (5).

2. A DC contactor having arc extinguishing structure according to claim 1, characterized in that, The stationary contact (7) and the moving contact (9) are coated.

3. The DC contactor with arc extinguishing structure according to claim 1, characterized in that, A contact box (11) is provided on the outside of the moving contact (9) and inside the sealed cavity.

4. The DC contactor with arc extinguishing structure according to claim 1, characterized in that, The metal grid (12) is disposed inside the sealed chamber and above the moving contact (9).

5. The DC contactor with arc extinguishing structure according to claim 1, characterized in that, The intelligent disconnector (13) is located inside the sealed chamber and below the moving contact (9).

6. A DC contactor with an arc-extinguishing structure according to claim 1, characterized in that, The sensor (14) is located inside the sealed chamber and on the side below the moving contact (9) away from the smart disconnector (13).

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