DC contactor structure

Abstract

The utility model discloses a direct current contactor structure, and belongs to the technical field of direct current contactors, the direct current contactor structure comprises an insulating end cover, a bottom plate and a U-shaped frame, the insulating end cover and the bottom plate are enclosed to form a sealing cavity, a static contact is embedded in the upper end of the insulating end cover, and an excitation device is arranged between the insulating end cover and the U-shaped frame; the excitation device is electrified to generate a magnetic field in the excitation device, and the movable magnetic core moves upwards under the action of the magnetic field, so that the guide rod can be driven by the movable magnetic core to move upwards to adjust the positions of the connecting piece and the movable contact, the movable contact and the static contact are in contact to be in a closed state, and the connection of a circuit is realized; and magnetic repulsive force is applied to the movable magnetic core under the cooperation of the movable magnetic core and the static magnetic core, so that the movable magnetic core quickly moves downwards to return to the original position, the movable contact and the static contact are separated and thixotropically changed into an opening state, and the disconnection of a circuit is realized, so that the quick cut-off capability of the direct current contactor is realized, the arc phenomenon is reduced, and the service life of the contact is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of DC contactors, and in particular to a DC contactor structure. Background Art

[0002] With technological advancements and social development, direct current (DC) is increasingly being used, particularly in emerging sectors such as electric vehicles, energy storage devices, and photovoltaic systems. DC contactors, as crucial switching components in these systems, play a crucial role in switching circuits. Traditional AC contactors, unable to effectively handle DC arcs, suffer from low reliability and short lifespan when used in DC circuits. In recent years, research addressing these issues has steadily increased, aiming to develop new, adaptable, and high-performance DC contactors to meet market demand.

[0003] The mainstream DC contactors on the market currently mainly use a bimetallic arc extinguishing mechanism, which extinguishes the arc by pushing the contacts to separate quickly due to the thermal deformation of the bimetallic strip. However, in actual use, the arc extinguishing efficiency of this structure is not high, especially for high current and high voltage DC power. The arc lasts for a long time, seriously affecting the safety and service life of the device. Therefore, improvements are now being made to a DC contactor structure. Utility Model Content

[0004] In response to the shortcomings of the existing technology, the present application provides a DC contactor structure that overcomes the shortcomings of the existing technology and aims to solve the problem that the arc extinguishing efficiency of the bimetallic arc extinguishing mechanism used in the existing DC contactor is low, especially for high current and high voltage DC power, the arc duration is long, which seriously affects the safety and service life of the device.

[0005] To achieve the above-mentioned objectives, the present application provides the following technical solutions: a DC contactor structure, comprising an insulating end cover, a base plate and a U-shaped frame, the insulating end cover and the base plate enclosing a sealed cavity, a static contact being embedded and installed at the upper end of the insulating end cover, an excitation device being arranged between the insulating end cover and the U-shaped frame, a guide rod, a moving magnetic core and a static magnetic core being arranged inside the excitation device, the moving magnetic core being fixedly sleeved on the outer surface of the guide rod near the lower end, the upper end of the guide rod slidingly passing through the static magnetic core and the base plate and being inserted into the interior of the sealed cavity, the upper end of the guide rod being fixedly connected to a connecting piece, and a moving contact matching the static contact being fixedly installed inside the connecting piece.

[0006] By adopting the above technical solution, a magnetic field is generated inside the excitation device by energizing it, and the moving magnetic core moves upward under the action of the magnetic field. That is, the guide rod can be driven upward by the moving magnetic core to adjust the position of the connecting piece and the moving contact, so that the moving contact and the static contact are in contact and become the closed state, thereby realizing the connection of the circuit. When the excitation device is not energized, a magnetic repulsive force is applied to the moving magnetic core with the cooperation of the moving magnetic core and the static magnetic core, so that the moving magnetic core moves quickly downward back to its original position, so that the moving contact and the static contact are separated and become the open state, thereby realizing the disconnection of the circuit, thereby realizing the rapid cutting-off capability of the DC contactor, reducing arcing, and extending the service life of the contacts.

[0007] As a preferred technical solution of the present application, the static magnetic core is fixedly clamped on the bottom of the base plate, and the static magnetic core and the dynamic magnetic core repel each other on their facing sides.

[0008] By adopting the above technical solution, when the excitation device is in the energized state, the magnetic field force applied by the excitation device is greater than the magnetic repulsion between the static magnetic core and the moving magnetic core, so that the moving magnetic core can move upward. When the excitation device is not energized, the moving magnetic core is only affected by the magnetic repulsion between the static magnetic core and the moving magnetic core, ensuring that the moving magnetic core can return to its original position under the action of the magnetic repulsion, thereby realizing the rapid disconnection of the DC contactor.

[0009] As a preferred technical solution of the present application, the excitation device includes a coil frame, a coil is wound on the outer wall of the coil frame, a guide tube is fixedly installed inside the coil frame, the moving magnetic core slides inside the guide tube, and the outer diameter of the moving magnetic core is adapted to the inner diameter of the guide tube.

[0010] By adopting the above technical solution, a guide cylinder is provided to provide a moving channel for the moving magnetic core, thereby facilitating the movement of the moving magnetic core.

[0011] As a preferred technical solution of the present application, a limiting block is fixedly connected to an inner wall of one side of the guide cylinder, a limiting groove is provided on an outer wall of one side of the moving magnetic core, and the limiting block is adapted to the limiting groove.

[0012] By adopting the above technical solution, the moving trajectory of the moving magnetic core is limited by the cooperation between the limit block and the limit slot, ensuring that the moving magnetic core can only move vertically up and down, thereby improving the stability of the moving magnetic core during movement and preventing the moving contact from positional displacement during movement.

[0013] As a preferred technical solution of the present application, a bellows is fixedly welded at the center of the top of the base plate, and the bellows is a retractable stainless steel welded pipe.

[0014] By adopting the above technical solution, the bellows can perform accurate pressure measurement and displacement compensation in the DC circuit breaker, improving the stability and reliability of the equipment.

[0015] As a preferred technical solution of the present application, the insulating end cover is fixedly welded to the top of the base plate, the base plate is fixedly connected to the U-shaped frame by mounting screws, and a screw gasket is provided between the mounting screws and the base plate.

[0016] By adopting the above technical solution, the insulating end cover, the bottom plate and the U-shaped frame can be assembled together.

[0017] As a preferred technical solution of the present application, the interior of the sealed cavity is filled with arc-extinguishing gas.

[0018] By adopting the above technical solution, the arc-extinguishing gas plays an insulating role in the DC circuit breaker, preventing the voltage in the gap between the static contact and the moving contact from being too high, which may cause the generation of an arc. When an arc occurs, the arc-extinguishing gas quickly extinguishes the arc through physical or chemical effects, thereby protecting the contacts and equipment from damage.

[0019] Beneficial effects of this application:

[0020] In the utility model, by energizing the excitation device to generate a magnetic field inside the device, the moving magnetic core moves upward under the action of the magnetic field, that is, the guide rod can be driven upward by the moving magnetic core to adjust the position of the connecting piece and the moving contact, so that the moving contact and the static contact are in contact and become the closed state, thereby realizing the connection of the circuit; when the excitation device is not energized, the moving magnetic core and the static magnetic core cooperate to apply a magnetic repulsive force to the moving magnetic core, so that the moving magnetic core quickly moves downward back to its original position, so that the moving contact and the static contact are separated and become the open state, thereby realizing the disconnection of the circuit, thereby realizing the rapid cutting-off capability of the DC contactor, reducing arcing and extending the service life of the contacts.

[0021] With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention may be employed. It should be understood that the scope of the embodiments of the present invention is not limited thereby. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the overall structure of this application;

[0023] Figure 2 This is a schematic diagram of the front cross-sectional structure of the present application;

[0024] Figure 3 This is a schematic diagram of the structure of the excitation device of this application;

[0025] Figure 4 This is a schematic diagram of the local structure of this application.

[0026] In the figure: 1. Insulating end cover; 2. Base plate; 3. U-shaped frame; 4. Sealed chamber; 5. Static contact; 6. Moving contact; 7. Excitation device; 701. Coil skeleton; 702. Coil; 8. Moving magnetic core; 9. Guide rod; 10. Connector; 11. Bellows; 12. Static magnetic core; 13. Guide cylinder; 14. Limit block; 15. Limit slot; 16. Mounting screw; 17. Screw gasket. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] like Figure 1 - Figure 4 As shown, a DC contactor structure provided in this embodiment includes an insulating end cover 1, a base plate 2 and a U-shaped frame 3. The insulating end cover 1 and the base plate 2 enclose a sealed cavity 4. A static contact 5 is embedded in the upper end of the insulating end cover 1. An excitation device 7 is provided between the insulating end cover 1 and the U-shaped frame 3. A guide rod 9, a moving magnetic core 8 and a static magnetic core 12 are provided inside the excitation device 7. The moving magnetic core 8 is fixedly sleeved on the outer surface of the guide rod 9 near the lower end. The upper end of the guide rod 9 slides through the static magnetic core 12 and the base plate 2 and is inserted into the interior of the sealed cavity 4. The upper end of the guide rod 9 is fixedly connected to a connector 10. A moving contact 6 matching the static contact 5 is fixedly installed inside the connector 10. During use, a magnetic field is generated inside the excitation device 7 by energizing it, and the moving magnetic core 8 moves upward under the action of the magnetic field. That is, the guide rod 9 can be driven upward by the moving magnetic core 8 to adjust the position of the connecting piece 10 and the moving contact 6, so that the moving contact 6 and the static contact 5 are in contact and become in a closed state, thereby realizing circuit connectivity. When the excitation device 7 is not energized, a magnetic repulsive force is applied to the moving magnetic core 8 with the cooperation of the moving magnetic core 8 and the static magnetic core 12, so that the moving magnetic core 8 quickly moves downward back to its original position, allowing the moving contact 6 and the static contact 5 to separate and become in an open state, thereby realizing circuit disconnection, thereby realizing the rapid cutting-off capability of the DC contactor, reducing arcing, and extending the service life of the contacts.

[0029] In this embodiment, if Figure 2As shown, the static magnetic core 12 is fixedly clamped on the bottom of the base plate 2, and the static magnetic core 12 and the dynamic magnetic core 8 repel each other on the opposite sides. During use, when the excitation device 7 is in the energized state, the magnetic field force applied by the excitation device 7 is greater than the magnetic repulsion between the static magnetic core 12 and the dynamic magnetic core 8, so that the dynamic magnetic core 8 can move upward. When the excitation device 7 is not energized, the dynamic magnetic core 8 is only affected by the magnetic repulsion between the static magnetic core 12 and the dynamic magnetic core 8, ensuring that the dynamic magnetic core 8 can return to its original position under the action of the magnetic repulsion, thereby realizing the rapid disconnection of the DC contactor.

[0030] In this embodiment, if Figure 2 and 3 As shown, the excitation device 7 includes a coil skeleton 701, a coil 702 is wound on the outer wall of the coil skeleton 701, a guide cylinder 13 is fixedly installed inside the coil skeleton 701, the moving magnetic core 8 slides inside the guide cylinder 13, and the outer diameter of the moving magnetic core 8 is adapted to the inner diameter of the guide cylinder 13. When in use, the guide cylinder 13 is set to provide a moving channel for the moving magnetic core 8, which facilitates the movement of the moving magnetic core 8.

[0031] In this embodiment, if Figure 3 and 4 As shown, a limiting block 14 is fixedly connected to the inner wall of one side of the guide cylinder 13, and a limiting groove 15 is provided on the outer wall of one side of the moving magnetic core 8. The limiting block 14 is adapted to the limiting groove 15. When in use, the moving trajectory of the moving magnetic core 8 is limited by the cooperation between the limiting block 14 and the limiting groove 15, ensuring that the moving magnetic core 8 can only move vertically up and down, thereby improving the stability of the moving magnetic core 8 during movement and preventing the moving contact 6 from positional displacement during movement.

[0032] In this embodiment, if Figure 2 As shown, a bellows 11 is fixedly welded to the center of the top of the base plate 2. The bellows 11 is a retractable stainless steel welded pipe. When in use, the bellows 11 can perform accurate pressure measurement and displacement compensation in the DC circuit breaker, thereby improving the stability and reliability of the equipment.

[0033] In this embodiment, if Figure 1 As shown, the insulating end cover 1 is fixedly welded to the top of the base plate 2, and the base plate 2 is fixedly connected to the U-shaped frame 3 by installing screws 16, and a screw gasket 17 is provided between the mounting screws 16 and the base plate 2, so as to facilitate the assembly of the insulating end cover 1, the base plate 2 and the U-shaped frame 3 together when in use.

[0034] In this embodiment, if Figure 2As shown, the interior of the sealed cavity 4 is filled with arc-extinguishing gas. When in use, the arc-extinguishing gas plays an insulating role in the DC circuit breaker to prevent the voltage in the gap between the static contact 5 and the moving contact 6 from being too high, which may cause the generation of an arc. When an arc is generated, the arc-extinguishing gas quickly extinguishes the arc through physical or chemical effects, thereby protecting the contacts and equipment from damage.

[0035] Working principle: When using a DC contactor structure of the present application, a magnetic field is generated inside the excitation device 7 by energizing it, and the moving magnetic core 8 moves upward under the action of the magnetic field, that is, the guide rod 9 can be driven upward by the moving magnetic core 8 to adjust the position of the connecting piece 10 and the moving contact 6, so that the moving contact 6 and the static contact 5 are in contact and become in a closed state, thereby realizing the connection of the circuit. When the excitation device 7 is not energized, a magnetic repulsive force is applied to the moving magnetic core 8 with the cooperation of the moving magnetic core 8 and the static magnetic core 12, so that the moving magnetic core 8 quickly moves downward back to its original position, allowing the moving contact 6 and the static contact 5 to separate and become in an open state, thereby realizing the disconnection of the circuit, thereby realizing the rapid cutting-off capability of the DC contactor, reducing arcing, and extending the service life of the contacts.

[0036] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "two ends," "one end," "the other end," and the like, indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "provided with," "connected," etc., should be understood in a broad sense. For example, "connected" may refer to a fixed connection, a detachable connection, or an integral connection; it may refer to a mechanical connection or an electrical connection; it may refer to a direct connection or an indirect connection through an intermediate medium; it may refer to internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0038] The present invention has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are merely illustrative and are not intended to limit the scope of protection of the present invention. Those skilled in the art may make various modifications and variations to the present invention based on the spirit and principles of the present invention, and such modifications and variations are also within the scope of the present invention.

Claims

1. A DC contactor structure, comprising an insulating end cover (1), a base plate (2) and a U-shaped frame (3), characterized in that: The insulating end cover (1) and the base plate (2) enclose a sealed cavity (4), a static contact (5) is embedded in the upper end of the insulating end cover (1), an excitation device (7) is provided between the insulating end cover (1) and the U-shaped frame (3), a guide rod (9), a moving magnetic core (8) and a static magnetic core (12) are provided inside the excitation device (7), the moving magnetic core (8) is fixedly sleeved on the outer surface of the guide rod (9) near the lower end, the upper end of the guide rod (9) slides through the static magnetic core (12) and the base plate (2) and is inserted into the inside of the sealed cavity (4), the upper end of the guide rod (9) is fixedly connected to a connector (10), and a moving contact (6) matching the static contact (5) is fixedly installed inside the connector (10).

2. A DC contactor structure according to claim 1, characterized in that: The static magnetic core (12) is fixedly clamped on the bottom of the base plate (2), and the static magnetic core (12) and the dynamic magnetic core (8) repel each other on their facing sides.

3. A DC contactor structure according to claim 2, characterized in that: The excitation device (7) includes a coil frame (701), a coil (702) is wound on the outer wall of the coil frame (701), a guide cylinder (13) is fixedly installed inside the coil frame (701), the moving magnetic core (8) slides inside the guide cylinder (13), and the outer diameter of the moving magnetic core (8) is adapted to the inner diameter of the guide cylinder (13).

4. A DC contactor structure according to claim 3, characterized in that: A limiting block (14) is fixedly connected to an inner wall of one side of the guide cylinder (13), a limiting slot (15) is provided on an outer wall of one side of the moving magnetic core (8), and the limiting block (14) is adapted to the limiting slot (15).

5. A DC contactor structure according to claim 1, characterized in that: A bellows (11) is fixedly welded at the center of the top of the bottom plate (2), and the bellows (11) is a retractable stainless steel welded pipe.

6. A DC contactor structure according to claim 1, characterized in that: The insulating end cover (1) is fixedly welded to the top of the base plate (2), and the base plate (2) is fixedly connected to the U-shaped frame (3) via mounting screws (16), and a screw washer (17) is provided between the mounting screws (16) and the base plate (2).

7. A DC contactor structure according to claim 1, characterized in that: The interior of the sealed cavity (4) is filled with arc-extinguishing gas.

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