Direct current contactor

Abstract

The invention provides a direct current contactor, which comprises a first contact bar unit, a second contact bar unit, an arc-shaped connecting piece and a magnetic enhancement assembly arranged on the first contact bar unit and the second contact bar unit, and is characterized in that the first contact bar unit comprises a first static contact bar, a second static contact bar and a first movable contact bar; the second contact bar unit comprises a third static contact bar, a fourth static contact bar and a second moving contact bar. The first contact bar unit and the second contact bar unit are connected in series through the arc-shaped connecting piece to form the static contact bridge, the opening distance of each group of contacts of the static contact bridge can be reduced, and it is guaranteed that electromagnetic pulling force is enough to enable the contacts to be attracted. The arrangement of the magnetic enhancement assembly enhances a magnetic field in the contactor, when the contacts are disconnected, repulsive forces between the contacts of the first contact bar unit and the second contact bar unit are enhanced and equal in magnitude, and the repulsive forces are positively correlated with the magnitude of current, so that synchronous and rapid separation can be realized; lorentz force borne by the electric arc can be adaptively adjusted along with the magnitude of the current, and positive feedback circulation is formed so that the electric arc can be diverged in the preset direction more quickly.

Description

Technical Field

[0001] This invention belongs to the field of contactor technology, and in particular relates to a DC contactor. Background Technology

[0002] Contactors, as switching devices, are widely used in new energy DC systems, especially in new energy vehicles and energy storage. Currently, both new energy vehicle BDUs and energy storage systems use a combination of contactors and fuses. Under normal circumstances, this effectively controls the on / off state of the main circuit. However, under abnormal conditions, contactor contacts may stick together, preventing them from automatically disconnecting. In this case, the fuse acts as a last line of defense, melting to protect the circuit. However, fuses are susceptible to damage from inrush currents each time the circuit is turned on, and they cannot be reused after melting. In the high-voltage environment of new energy DC systems, the above solution also suffers from the problem of generating a strong electric arc when the contactor disconnects, which can damage the contactor contacts.

[0003] To address the large electric arc during the breaking of high-voltage contactors, existing technologies offer several solutions: adding arc-initiating plates, arc-extinguishing grids, and permanent magnet systems within the contactor to accelerate arc extinguishing; however, these methods are ineffective for higher-voltage DC systems. Another approach is to increase the opening distance by connecting multiple switching units in series and parallel. However, this increases the tension provided by the elastic element with more switching units, while the electrical repulsion between contacts remains unchanged. This mismatch between the increased tension and the electrical repulsion exacerbates the difficulty of contact breaking. Therefore, all of these technical solutions have limitations. Summary of the Invention

[0004] This invention addresses the technical problems of long breaking time and difficulty in extinguishing electric arcs in existing high-voltage contactors by providing a DC contactor.

[0005] In view of the above technical problems, the present invention provides a DC contactor, including a first contact unit, a second contact unit, an arc-shaped connector, and a magnetic enhancement component disposed on the first contact unit and the second contact unit. The first contact unit includes a first stationary contact unit, a second stationary contact unit, and a first movable contact unit. The second contact unit includes a third stationary contact unit, a fourth stationary contact unit, and a second movable contact unit. The first stationary contact bar and the second stationary contact bar are arranged on a first straight line, and the first stationary contact bar is located at the first end of the first straight line; the third stationary contact bar and the fourth stationary contact bar are arranged on a second straight line, and the third stationary contact bar is located at the first end of the second straight line; the first straight line, the second straight line, the first moving contact bar, and the second moving contact bar are arranged in parallel; the first moving contact bar and the second moving contact bar are located on a preset plane, and the first stationary contact bar, the second stationary contact bar, the third stationary contact bar, and the fourth stationary contact bar are all located on the same side of the preset plane; The arc-shaped connector is connected between the first end of the first stationary contact bar and the first end of the third stationary contact bar; the first contact surface of the first stationary contact bar and the second contact surface of the second stationary contact bar are arranged opposite to the third contact surface of the first moving contact bar, and the fourth contact surface of the third stationary contact bar and the fifth contact surface of the fourth stationary contact bar are arranged opposite to the sixth contact surface of the second moving contact bar, so as to control the on / off state of the switch by contact or separation between the third contact surface and the first and second contact surfaces, and between the sixth contact surface and the fourth and fifth contact surfaces; The first contact surface, the second contact surface, the third contact surface, the fourth contact surface, the fifth contact surface, and the sixth contact surface form a switching space, and the magnetic enhancement component is located outside the switching space.

[0006] Optionally, the arc-shaped connector includes a connecting portion and a first connector and a second connector respectively connected to both ends of the connecting portion; the first connector and the second connector are both disposed on the side of the connecting portion near the first contact plate unit; and the first connector is connected to the first end of the first stationary contact plate; the second connector is connected to the first end of the third stationary contact plate.

[0007] Optionally, the first connector is connected to the first end of the first stationary contact bar at a first preset angle; the second connector is connected to the first end of the third stationary contact bar at a second preset angle. The connecting portion is arc-shaped; and / or the arc-shaped connector includes a first arc-shaped connecting portion connecting the connecting portion and the first joint, and a second arc-shaped connecting portion connecting the connecting portion and the second joint; The first preset angle and the second preset angle are equal, the arc radii of the first arc connecting part and the second arc connecting part are equal, and the arc radius of the first arc connecting part is greater than or equal to the width of the first static contact bar.

[0008] Optionally, both the first preset angle and the second preset angle are 0°; The first connector is connected to the first end of the first stationary contact bar, and the second connector is connected to the first end of the third stationary contact bar; or The first connector is connected to the bottom surface of the first end of the first stationary contact bar, and the second connector is connected to the bottom surface of the first end of the third stationary contact bar.

[0009] Optionally, the magnetic enhancement assembly includes a first magnetic enhancement element disposed on a first mounting surface of the first movable contact block, and a second magnetic enhancement element disposed on a second mounting surface of the second movable contact block; the first mounting surface is the end face of the first movable contact block facing away from the third contact surface; the second mounting surface is the end face of the second movable contact block facing away from the sixth contact surface.

[0010] Optionally, the magnetic enhancement assembly includes a third magnetic enhancement element disposed on a third mounting surface of the first stationary contact bar, a fourth magnetic enhancement element disposed on a fourth mounting surface of the second stationary contact bar, a fifth magnetic enhancement element disposed on a fifth mounting surface of the third stationary contact bar, and a sixth magnetic enhancement element disposed on a sixth mounting surface of the fourth stationary contact bar. The third mounting surface is the end face of the first stationary contact bar that is opposite to the first contact surface; the fourth mounting surface is the end face of the second stationary contact bar that is opposite to the second contact surface; the fifth mounting surface is the end face of the third stationary contact bar that is opposite to the fourth contact surface; and the sixth mounting surface is the fourth mounting surface of the fourth stationary contact bar that is opposite to the fifth contact surface.

[0011] Optionally, with a preset reference axis as the axis of symmetry, the first movable contact row and the second movable contact row are symmetrically arranged, and the first contact row unit and the second contact row unit are symmetrically arranged; The preset reference axis is parallel to the first movable contact plate and passes through the midpoint between the first and second movable contact plates.

[0012] Optionally, the first static contact bar includes a first connecting segment, a first contact segment disposed parallel to the first connecting segment, and a first arc-shaped segment connecting the first connecting segment and the first contact segment, wherein the first contact surface is disposed on the end face of the first contact segment facing away from the first connecting segment. The second static contact bar includes a second connecting section, a second contact section parallel to the second connecting section, and a second arc-shaped section connecting the second connecting section and the second contact section. The third contact surface is disposed on the end face of the second contact section facing away from the second connecting section. The second arc-shaped segment is located on the side of the second stationary contact bar that is closer to the first stationary contact bar; the first arc-shaped segment is located on the side of the first stationary contact bar that is closer to the second stationary contact bar, and the length of the first connecting segment is less than the length of the second connecting segment.

[0013] Optionally, a first moving contact and a second moving contact are provided on the third contact surface, a first stationary contact is provided on the first contact surface opposite to the first moving contact, and a second stationary contact is provided on the second contact surface opposite to the second moving contact; The sixth contact surface is provided with a third moving contact and a fourth moving contact, the fourth contact surface is provided with a third stationary contact arranged opposite to the third moving contact, and the fifth contact surface is provided with a fourth stationary contact arranged opposite to the fourth moving contact. The DC contactor controls the switching on and off by contacting or separating the first moving contact and the first stationary contact, the second moving contact and the second stationary contact, the third moving contact and the third stationary contact, and the fourth moving contact and the fourth stationary contact.

[0014] Optionally, the DC contactor further includes a drive assembly connecting the first moving contact block and the second moving contact block; The driving component is used to drive the first moving contact bar to move closer to or away from the first stationary contact bar and the second stationary contact bar, so as to control the third contact surface to contact or separate from the first contact surface and the second contact surface. The driving component is also used to drive the second moving contact bar to move closer to or away from the third stationary contact bar and the fourth stationary contact bar, so as to control the sixth contact surface to contact or separate from the fourth contact surface and the fifth contact surface.

[0015] In this invention, the DC contactor includes a first contact bar unit, a second contact bar unit, an arc-shaped connector, and a magnetic enhancement component disposed on the first contact bar unit and the second contact bar unit. The first contact bar unit includes a first stationary contact bar, a second stationary contact bar, and a first moving contact bar. The second contact bar unit includes a third stationary contact bar, a fourth stationary contact bar, and a second moving contact bar.

[0016] In this invention, the first and second contact units are connected in series by an arc-shaped connector, forming a stationary contact bridge. This not only increases the rated voltage and current of the contactor but also increases the current density of the stationary contact bridge. Simultaneously, a magnetic enhancement component is placed outside the switching space, creating two magnetic field loops within the first and second contact units. The magnetic enhancement component guides and strengthens the magnetic field. Thus, when the contacts of the first and second contact units are disconnected, an equal and opposite electromagnetic repulsive force is generated between them, with the magnitude of the repulsive force being positively correlated with the current magnitude, achieving synchronous and rapid separation. The electric arc is also subjected to an electromagnetic force of the same magnitude but opposite direction, which will guide it to diverge more quickly in a preset direction. Furthermore, the magnitude of the Lorentz force of the arc adaptively adjusts with the current magnitude, forming a positive feedback loop of high current - strong arc - strong magnetic field - large Lorentz force. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1This is a schematic diagram of the structure of a DC contactor provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a DC contactor provided in another embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a DC contactor provided in another embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a DC contactor provided in another embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of a DC contactor provided in another embodiment of the present invention; Figure 6 This is a schematic diagram of the mounting structure of a DC contactor provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the mounting structure of a DC contactor provided in another embodiment of the present invention; Figure 8 This is a schematic diagram illustrating the Lorentz force of an electric arc between contacts in a contact assembly according to an embodiment of the present invention. Figure 9 This is a schematic diagram of the Lorentz force of the electric arc between the contacts of a contact assembly provided in another embodiment of the present invention. Figure 10 This is a simulation diagram of the current density of a DC contactor provided in an embodiment of the present invention; Figure 11 This is a magnetic field effect diagram of a DC contactor provided in an embodiment of the present invention; Figure 12 This is a linear graph showing the change of electric repulsion force between contacts of a DC contactor as a function of current, according to an embodiment of the present invention.

[0019] The reference numerals in the accompanying drawings are as follows: 10-First contact unit, 11-First stationary contact unit, 111-First contact surface, 112-Third mounting surface, 113-First connecting section, 114-First contact section, 115-First arc-shaped section, 116-First stationary contact, 12-Second stationary contact unit, 121-Second contact surface, 122-Fourth mounting surface, 123-Second connecting section, 124-Second contact section, 125-Second arc-shaped section, 126-Second stationary contact, 13-First moving contact unit, 131-Third contact surface, 132-First mounting surface, 133-First moving contact, 134-Second moving contact, 20-First... Two-contact unit, 21-Third stationary contact block, 22-Fourth stationary contact block, 23-Second moving contact block, 231-Second mounting surface, 30-Arc-shaped connector, 31-Connecting part, 32-First connector, 33-Second connector, 40-Magnetic reinforcement assembly, 41-First magnetic reinforcement element, 42-Second magnetic reinforcement element, 43-Third magnetic reinforcement element, 44-Fourth magnetic reinforcement element, 45-Fifth magnetic reinforcement element, 46-Sixth magnetic reinforcement element, 50-First driving element, 51-Elastic bracket, 52-Coil, 53-Stationary iron core, 54-Connecting rod, 55-Moving iron core, 60-Second driving element. Detailed Implementation

[0020] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention.

[0021] In the description of this invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] like Figures 1 to 5 As shown, an embodiment of the present invention provides a DC contactor, including a first contact unit 10, a second contact unit 20, an arc-shaped connector 30, and a magnetic enhancement component 40 disposed on the first contact unit 10 and the second contact unit 20. The first contact unit 10 includes a first stationary contact unit 11, a second stationary contact unit 12, and a first moving contact unit 13. The second contact unit 20 includes a third stationary contact unit 21, a fourth stationary contact unit 22, and a second moving contact unit 23. The first stationary contact row 11 and the second stationary contact row 12 are arranged on a first straight line, and the first stationary contact row 11 is located at the first end of the first straight line; the third stationary contact row 21 and the fourth stationary contact row 22 are arranged on a second straight line, and the third stationary contact row 21 is located at the first end of the second straight line; the first straight line, the second straight line, the first moving contact row 13 and the second moving contact row 23 are arranged in parallel; the first moving contact row 13 and the second moving contact row 23 are located on a preset plane, and the first stationary contact row 11, the second stationary contact row 12, the third stationary contact row 21 and the fourth stationary contact row 22 are all located on the same side of the preset plane; The arc-shaped connector 30 is connected between the first end of the first stationary contact bar 11 and the first end of the third stationary contact bar 21; the first contact surface 111 of the first stationary contact bar 11 and the second contact surface 121 of the second stationary contact bar 12 are arranged opposite to the third contact surface 131 of the first moving contact bar 13, and the fourth contact surface of the third stationary contact bar 21 and the fifth contact surface of the fourth stationary contact bar 22 are arranged opposite to the sixth contact surface of the second moving contact bar 23, so as to control the on / off state of the switch by the contact or separation between the third contact surface 131 and the first contact surface 111 and the second contact surface 121, and between the sixth contact surface and the fourth contact surface and the fifth contact surface; The first contact surface 111, the second contact surface 121, the third contact surface 131, the fourth contact surface, the fifth contact surface, and the sixth contact surface form a switching space, and the magnetic enhancement component 40 is located outside the switching space.

[0024] The first stationary contact row 11 and the second stationary contact row 12 are located on a first straight line parallel to the first moving contact row 13, that is, the first stationary contact row 11 and the second stationary contact row 12 are arranged at intervals on the same plane and are parallel to the first moving contact row 13; the first contact surface 111 of the first stationary contact row 11 and the second contact surface 121 of the second stationary contact row 12 are also on the same plane and are arranged opposite to the third contact surface 131 of the first moving contact row 13. The third stationary contact row 21 and the fourth stationary contact row 22 are located on a second straight line parallel to the second moving contact row 23, that is, the third stationary contact row 21 and the fourth stationary contact row 22 are arranged at intervals on the same plane and are parallel to the second moving contact row 23; the fourth contact surface of the third stationary contact row 21 and the fifth contact surface of the second stationary contact row 22 are also on the same plane and are arranged opposite to the sixth contact surface of the second moving contact row 23. Thus, the first contact row unit 10 and the second contact row unit 20 constitute two sets of contact row assemblies, with their first contact surface 111, second contact surface 121, third contact surface 131, fourth contact surface, fifth contact surface and sixth contact surface. The two contacts form an on / off space. When the first movable contact 13 reciprocates in a direction that approaches and moves away from the first stationary contact 11 and the second stationary contact 12, the contacts between the third contact surface 131 and the first contact surface 111 and the second contact surface 121 are brought into contact or separated. When the second movable contact 23 reciprocates in a direction that approaches and moves away from the third stationary contact 21 and the fourth stationary contact 22, the contacts between the sixth contact surface and the fourth contact surface and the fifth contact surface are brought into contact or separated. This controls the on / off state of the switch. When the switch is turned on or off, an electric arc will be generated at the position of the aforementioned contacts, and a small portion of the electric arc will spread into the on / off space.

[0025] Furthermore, the arc-shaped connector 30 connects the first end of the first stationary contact bar 11 and the first end of the third stationary contact bar 21, connecting the first stationary contact bar 11 and the second stationary contact bar 12 to form a stationary contact bridge, thereby realizing the series connection of the two sets of contact bar assemblies, that is, as shown in the figure. Figure 10 As shown, the first contact unit 10 and the second contact unit 20 are connected in series by the arc-shaped connector 30. This not only increases the rated voltage and current of the contactor but also increases the current density of the stationary contact bridge. Increased current density means a larger current flows through the same volume or area. Since the magnetic field is generated by the current, the increased current density directly enhances the magnetic field strength of the first contact unit 10 and the second contact unit 20. Furthermore, with the magnetic enhancement component 40, two magnetic field loops can be formed in the first contact unit 10 and the second contact unit 20. The magnetic enhancement component 40 can guide and enhance the magnetic field. Thus, when the contacts of the first contact unit 10 and the second contact unit 20 are disconnected, the arc will be subjected to electromagnetic forces of the same magnitude and opposite direction, and will diverge more quickly in the predetermined direction. Simultaneously, an electro-repulsive force of the same magnitude and direction will be generated between the contacts, and the magnitude of the electro-repulsive force is positively correlated with the current magnitude, thereby achieving synchronous separation.

[0026] Furthermore, a magnetic enhancement component 40 is installed outside the switching space. This component enhances the magnetic permeability of the contact assembly and the switching space, thereby strengthening the magnetic field intensity within the switching space. This increases the Lorentz force on the arc and charged particles, causing them to diverge and be guided more quickly in a predetermined direction, thus extinguishing the arc more rapidly. When the switch needs to be opened, the magnetic enhancement component 40 also effectively increases the electrodynamic repulsive force between the corresponding contacts of the third contact surface 131 and the first contact surface 111 and the second contact surface 121, as well as the electrodynamic repulsive force between the corresponding contacts of the sixth contact surface and the fourth and fifth contact surfaces. This allows the two sets of switches connected in series to open simultaneously more quickly and reliably, while reducing delays and uncertainties during the opening process. In contrast, if the magnetic reinforcement component 40 is directly installed inside the switching space, i.e., placed on the first contact surface 111, the second contact surface 121, the third contact surface 131, the sixth contact surface, the fourth contact surface, and the fifth contact surface, it not only fails to effectively increase the electrodynamic repulsion between the contacts, but also generates an attractive force instead of a repulsive force as the current increases. This results in a tighter attraction between corresponding contacts on the first contact surface 111, the second contact surface 121, and the third contact surface 131, as well as between corresponding contacts on the sixth contact surface, the fourth contact surface, and the fifth contact surface. This undesirable attraction prolongs the switching time and may also exacerbate the erosion of the contact assembly by the electric arc. Thus, as... Figure 11 As shown, after the first contact unit 10 and the second contact unit 20 are connected in series by an arc-shaped connector, a magnetic enhancement component 40 is set in conjunction. The magnetic field distribution and intensity of the first contact unit 10 and the second contact unit 20 are consistent, and the magnetic intensity increases with the increase of current. The electric repulsion between the contacts of the two sets of contact units increases synchronously and is equal.

[0027] Furthermore, the direction of the induced magnetic field generated by the magnetic enhancement component 40 in the switching space can change with the change of the current direction flowing through the first contact unit 10 and the second contact unit 20. Regardless of the change of the current direction, the direction of the Lorentz force on the arc and the charged gas particles remains unchanged, which can guide the arc to diverge in the preset direction. Moreover, the magnitude of the Lorentz force of the arc is adaptively adjusted with the magnitude of the current, forming a positive feedback loop of large current - strong arc - strong magnetic field - large Lorentz force. Conversely, a small current corresponds to a weak arc, a weak magnetic field and a smaller Lorentz force, thereby realizing adaptive adjustment of the magnitude of the Lorentz force of the arc. This effectively prevents the arc energy intensity and the magnitude of the Lorentz force from being unequal, which would lead to the inability to quickly extinguish the arc or blow the molten contact alloy material into the arc extinguishing grid and block the filter, resulting in poor arc extinguishing effect or failure. This effectively improves the reliability of the switching device.

[0028] In the above embodiments of the present invention, the first contact unit 10 and the second contact unit 20 are connected in series by an arc-shaped connector 30. The arc-shaped connector 30 connects the first stationary contact unit 11 and the second stationary contact unit 12 to form a stationary contact bridge, which not only increases the rated voltage and current of the contactor, but also increases the current density of the stationary contact bridge. At the same time, a magnetic enhancement component 40 is set outside the switching space, so that two magnetic field loops can be formed in the first contact unit 10 and the second contact unit 20. The magnetic enhancement component 40 can guide and enhance the magnetic field. In this way, when the contacts of the first contact unit 10 and the contacts of the second contact unit 20 are disconnected, an electric repulsive force of the same direction and equal magnitude will be generated between the contacts. The magnitude of the electric repulsive force is positively correlated with the magnitude of the current, thereby realizing synchronous and rapid separation between the contacts, and thus eliminating the need for a fuse. The electric arc will also be subjected to an electromagnetic force of the same magnitude and opposite direction and will be guided to diverge more quickly in a preset direction. The magnitude of the Lorentz force of the electric arc will be adaptively adjusted with the magnitude of the current, forming a positive feedback loop of large current-strong electric arc-strong magnetic field-large Lorentz force. Furthermore, after the first contact unit 10 and the second contact unit 20 are connected in series through the arc-shaped connector 30, the minimum distance required to open the arc when the contactor breaks is the sum of the opening distances of all contact groups in the contact assembly. This means that the opening distance of each group of contacts can be reduced, and the overall volume of the contactor can be reduced while meeting the arc opening distance requirement.

[0029] By setting up the arc-shaped connector 30 and the magnetic reinforcement component 40, the size of the contactor is successfully reduced. At the same time, it ensures that the contactor can open a sufficient arc distance when breaking, and ensures that the total opening distance is sufficient to extinguish the arc under high voltage. This not only optimizes the performance of the contactor, but also makes the contactor more compact and lightweight.

[0030] In one embodiment, such as Figure 1 and Figure 2 As shown, the arc-shaped connector 30 includes a connecting portion 31 and a first connector 32 and a second connector 33 respectively connected to both ends of the connecting portion 31. Both the first connector 32 and the second connector 33 are located on the side of the connecting portion 31 near the first contact unit 10. The first connector 32 connects to the first end of the first stationary contact unit 11, and the second connector 33 connects to the first end of the third stationary contact unit 21. Understandably, the first contact unit 10 and the second contact unit 20 are arranged in parallel and in the same direction. The first stationary contact unit 11 and the third stationary contact unit 21 are arranged on the same side. The first connector 32 connects to the first end of the first stationary contact unit 11, and the second connector 33 connects to the first end of the third stationary contact unit 21. Thus, the arc-shaped connector 30 is located on one side of the first contact unit 10 and the second contact unit 20. That is, one side of the first contact unit 10 and the second contact unit 20 is a closed end, and the other side is a free end (the side of the second stationary contact unit 12 and the fourth stationary contact unit 22). The free end is used to connect external devices.

[0031] In one embodiment, such as Figure 1 and Figure 4 As shown, the first connector 32 is connected to the first end of the first stationary contact bar 11 at a first preset angle; the second connector 33 is connected to the first end of the third stationary contact bar 21 at a second preset angle; the connecting part 31 is arc-shaped; and / or the arc-shaped connector 30 includes a first arc-shaped connecting part connected between the connecting part 31 and the first connector 32, and a second arc-shaped connecting part connected between the connecting part 31 and the second connector 33; the first preset angle and the second preset angle are equal, the arc radii of the first arc-shaped connecting part and the second arc-shaped connecting part are equal, and the arc radius of the first arc-shaped connecting part is greater than or equal to the width of the first stationary contact bar 11. Understandably, the first connector 32 is connected to the first end of the first stationary contact bar 11 through the first arc connecting part and at the first preset angle, and the second connector 33 is connected to the first end of the third stationary contact bar 21 through the second arc connecting part and at the second preset angle. That is, the connection between the arc connecting part 31 and the first stationary contact bar 11 and the connection between the arc connecting part 31 and the third stationary contact bar 21 are both rounded. If the connection is a right angle, after adding the magnetic reinforcement component 40, the electric repulsion between the contacts of the first contact bar unit 10 and the second contact bar unit 20 will result in a situation where there is no electric repulsion on one side and the electric repulsion on the other side is smaller than that without adding the magnetic reinforcement component 40. Only the arc-shaped connecting part can meet the requirements of increasing the electric repulsion and equal force on both sides. When the radius of the arc of the first arc connection is equal to the width of the first stationary contact bar 11, the first stationary contact bar 11, the arc connection 31 and the third stationary contact bar 21 can also be formed by bending the same copper busbar, which reduces the material preparation and processing steps, makes the connection between each part tighter, and has no additional welding points or connectors, so the overall structural strength is higher.

[0032] In one embodiment, such as Figure 1 As shown, both the first preset angle and the second preset angle are 0°; The first connector 32 is connected to the first end of the first stationary contact bar 11, and the second connector 33 is connected to the first end of the third stationary contact bar 21; it is understood that, as Figure 1As shown, the direction from the second stationary contact row 12 to the first stationary contact row 11 is defined as 0°, and the direction from the first stationary contact row 11 to the second stationary contact row 12 is defined as 180°; the direction from the fourth stationary contact row 22 to the third stationary contact row 21 is defined as 0°, and the direction from the third stationary contact row 21 to the fourth stationary contact row 22 is defined as 180°; when both the first preset angle and the second preset angle are 0°, the plane where the first connector 32 is located is flush with the plane where the first stationary contact row 11 is located, and the plane where the second connector 33 is located is flush with the plane where the third stationary contact row 21 is located. At this time, the installation process of the arc-shaped connector 30 becomes simpler and more direct, and the current flows more smoothly between the first connector 32 and the first stationary contact row 11, and between the second connector 33 and the third stationary contact row 21.

[0033] In another embodiment, such as Figure 4 As shown, the first connector 32 is connected to the bottom surface of the first end of the first stationary contact bar 11, and the second connector 33 is connected to the bottom surface of the first end of the third stationary contact bar 21. Understandably, when both the first preset angle and the second preset angle are 0°, the first connector 32 can also be welded or connected to the bottom surface of the first end of the first stationary contact bar 11 by screws, and the second connector 33 can also be welded or connected to the bottom surface of the first end of the third stationary contact bar 21 by screws. This connection method allows for the disassembly and reinstallation of the arc-shaped connector 30 when needed, simplifying parts maintenance and replacement.

[0034] In one embodiment, such as Figure 1 , Figure 3 and Figure 4As shown, the magnetic enhancement assembly 40 includes a first magnetic enhancement element 41 disposed on a first mounting surface 132 of the first movable contact plate 13, and a second magnetic enhancement element 42 disposed on a second mounting surface 231 of the second movable contact plate 23. The first mounting surface 132 is the end face of the first movable contact plate 13 facing away from the third contact surface 131; the second mounting surface 231 is the end face of the second movable contact plate 23 facing away from the sixth contact surface. Understandably, both the first mounting surface 132 and the second mounting surface 231 of the first movable contact plate 13 are disposed outside the switching space. By disposing the first magnetic enhancement element 41 on the first mounting surface 132 of the first movable contact plate 13 and the second magnetic enhancement element 42 on the second mounting surface 231 of the second movable contact plate, the magnetic field strength of the switching space is directly enhanced, thereby increasing the electrodynamic repulsive force between the contacts of the first contact plate unit 10 and the second contact plate unit 20 and providing equal electrodynamic repulsive forces, thus accelerating the disconnection speed between the contacts. After the magnetic field strength in the switching space is enhanced, the Lorentz force on the arc is also adaptively enhanced, causing the arc to diverge faster in the preset direction. Since the magnetic field strength generated by the first magnetic enhancement element 41 and the second magnetic enhancement element 42 is positively correlated with the current magnitude, that is, the larger the current, the stronger the magnetic field, and the corresponding Lorentz force also increases. This adaptive characteristic ensures that arcs of different intensities can respond to Lorentz forces of different current magnitudes, effectively preventing arc extinguishing problems caused by the mismatch between arc energy and Lorentz force, such as the inability to extinguish the arc quickly or the molten contact alloy material being blown into the arc extinguishing grid and the filter screen becoming clogged.

[0035] In one embodiment, such as Figure 1 , Figure 3 and Figure 4 As shown, the magnetic enhancement assembly 40 includes a third magnetic enhancement element 43 disposed on the third mounting surface 112 of the first stationary contact bar 11, a fourth magnetic enhancement element 44 disposed on the fourth mounting surface 122 of the second stationary contact bar 12, a fifth magnetic enhancement element 45 disposed on the fifth mounting surface of the third stationary contact bar 21, and a sixth magnetic enhancement element 46 disposed on the sixth mounting surface of the fourth stationary contact bar 22. The third mounting surface 112 is the end face of the first stationary contact bar 11 that faces away from the first contact surface 111; the fourth mounting surface 122 is the end face of the second stationary contact bar 12 that faces away from the second contact surface 121; the fifth mounting surface is the end face of the third stationary contact bar 21 that faces away from the fourth contact surface; and the sixth mounting surface is the end face of the fourth stationary contact bar 22 that faces away from the fifth contact surface. Understandably, the third mounting surface 112, the fourth mounting surface 122, the fifth mounting surface, and the sixth mounting surface are all located outside the switching space. The functions of the third magnetic enhancement element 43, the fourth magnetic enhancement element 44, the fifth magnetic enhancement element 45, and the sixth magnetic enhancement element 46 are the same as those of the first magnetic enhancement element 41 and the second magnetic enhancement element 42, and will not be repeated here.

[0036] In yet another embodiment, such as Figure 1 , Figure 3 and Figure 4 As shown, the magnetic enhancement assembly 40 includes a first magnetic enhancement element 41, a second magnetic enhancement element 42, a third magnetic enhancement element 43, a fourth magnetic enhancement element 44, a fifth magnetic enhancement element 45, and a sixth magnetic enhancement element 46 simultaneously disposed outside the switching space. Understandably, the magnetic field distribution inside the switching space can be further optimized, causing the magnetic fields generated by the magnetic enhancement assembly 40 to superimpose within the switching space, forming a stronger composite magnetic field. As current passes through the first contact unit 10 and the second contact unit 20, the enhanced magnetic field will significantly increase the Lorentz force on the arc. Due to the increased magnetic field strength, the electrodynamic repulsive force generated by the change in magnetic field will also further increase.

[0037] In another embodiment, the first magnetic reinforcing element 41, the second magnetic reinforcing element 42, the third magnetic reinforcing element 43, the fourth magnetic reinforcing element 44, the fifth magnetic reinforcing element 45, and the sixth magnetic reinforcing element 46 are all soft magnetic materials, and their working principle is as follows: by Figure 8 For reference, when the current path is from the first stationary contact group 11 to the first moving contact group 13 and then to the second stationary contact group 12: The current direction of the first stationary contact 11 is from right to left, and the current direction of the first moving contact 13 is from left to right. According to the right-hand screw rule, the thumb points in the direction of the current, and the direction of the four fingers is the direction of the magnetic field lines. Therefore, it can be determined that the magnetic field lines in the on / off space between the first stationary contact 11 and the first moving contact 13 are in the same direction.

[0038] At this time, the direction of the current in the switching space is from the first stationary contact 11 to the first moving contact 13. Using the left-hand rule, the direction in which the four fingers point is the direction of the current, so that the magnetic field lines pass through the palm. At this time, the direction in which the thumb, which is perpendicular to the four fingers, points is the direction of the Lorentz force on the charge in the arc, which points exactly to one side of the contact assembly. Figure 8(As shown on the left side of the on / off space), the greater the current, the greater the Lorentz force of the arc.

[0039] like Figure 11 and Figure 12 As shown, since the magnetic field lines of the switching space between the first stationary contact group 11 and the first moving contact group 13 are in the same direction, it is equivalent to the magnetic poles of the contacts of the first stationary contact group 11 and the contacts of the first moving contact group 13 being the same and opposite to each other, which will generate a repulsive force. The soft magnetic material can greatly increase the magnetic field strength, which can further increase the repulsive force. That is, the larger the current, the stronger the magnetic field of the switching space, and the greater the repulsive force between the contacts, thus prompting the switch to open quickly.

[0040] The current direction of the second stationary contact group 12 is the same as that of the first stationary contact group 11. According to the same determination method described above, the direction of the Lorentz magnetic force on the arc between the second stationary contact group 12 and the first moving contact group 13 points to the other side of the contact group assembly. Figure 8 (The right side of the on / off space shown).

[0041] by Figure 9 For reference, when the current path is from the second stationary contact row 12 to the first moving contact row 13 and then to the first stationary contact row 11, the judgment principle is the same as above. The result is that no matter how the current direction changes, the arc can be made to diverge more quickly in the preset direction, thus accelerating the arc blowing and extinguishing process.

[0042] When the current path is from the third stationary contact 21 to the second moving contact 23 to the fourth stationary contact 22, the determination method is the same as above.

[0043] In one embodiment, such as Figure 1 and Figure 2 As shown, with a preset reference axis as the axis of symmetry, the first movable contact group 13 and the second movable contact group 23 are symmetrically arranged, and the first contact group unit 10 and the second contact group unit 20 are symmetrically arranged; the preset reference axis is parallel to the first movable contact group 13 and passes through the midpoint between the first movable contact group 13 and the second movable contact group 23. Understandably, the symmetrical arrangement of the first contact group unit 10 and the second contact group unit 20 with the preset reference axis as the axis of symmetry helps to ensure uniform current distribution and reduce the thermal effect caused by current concentration.

[0044] In one embodiment, such as Figures 1 to 4As shown, the first stationary contact bar 11 includes a first connecting segment 113, a first contact segment 114 parallel to the first connecting segment 113, and a first arc-shaped segment 115 connecting the first connecting segment 113 and the first contact segment 114. The first contact surface 111 is disposed on the end face of the first contact segment 114 facing away from the first connecting segment 113. The second stationary contact bar 12 includes a second connecting segment 123, a second contact segment 124 parallel to the second connecting segment 123, and a second arc-shaped segment 125 connecting the second connecting segment 123 and the second contact segment 124. The third contact surface 131 is disposed on the end face of the second contact segment 124 facing away from the second connecting segment 123. The second arc-shaped segment 125 is located on the side of the second stationary contact bar 12 closer to the first stationary contact bar 11. The first arc-shaped segment 115 is located on the side of the first stationary contact bar 11 closer to the second stationary contact bar 12. The length of the first connecting segment 113 is less than the length of the second connecting segment 123. Understandably, the first stationary contact bar 11 is a C-shaped or U-shaped structure composed of a first connecting segment 113, a first arc segment 115, and a first contact segment 114 connected in sequence. The first connecting segment 113 is used to connect the arc-shaped connector 30, and the second connecting segment 123 is stably connected to external devices and circuits to ensure the effective transmission of electrical signals or current. The second stationary contact bar 12 is a C-shaped or U-shaped structure composed of a second connecting segment 123, a second arc segment 125, and a second contact segment 124 connected in sequence. The second connecting segment 123 is used to connect the arc-shaped connector 30. The first contact segment 114 is arranged opposite to the third contact surface 131 of the moving contact bar, and the second contact segment 124 is arranged opposite to the third contact surface 131 of the moving contact bar to facilitate the closing and opening functions of the switch.

[0045] In one embodiment, such as Figure 1 and Figure 2 As shown, a first moving contact 133 and a second moving contact 134 are provided on the third contact surface 131. A first stationary contact 116 is provided on the first contact surface 111 opposite to the first moving contact 133. A second stationary contact 126 is provided on the second contact surface 121 opposite to the second moving contact 134. Understandably, the first moving contact 133 and the first stationary contact 116 are arranged opposite to each other, and the second moving contact 134 and the second stationary contact 126 are arranged opposite to each other, and both are located within the switching space. By controlling the contact and separation of the first moving contact 133 and the first stationary contact 116, and the contact and separation of the second moving contact 134 and the second stationary contact 126, the switching can be completed.

[0046] A third moving contact and a fourth moving contact are provided on the sixth contact surface. A third stationary contact is provided on the fourth contact surface opposite to the third moving contact. A fourth stationary contact is provided on the fifth contact surface opposite to the fourth moving contact. The DC contactor controls the switching on and off by contacting or separating the first moving contact 133 and the first stationary contact 116, the second moving contact 134 and the second stationary contact 126, the third moving contact and the third stationary contact, and the fourth moving contact and the fourth stationary contact. Understandably, the third moving contact and the third stationary contact are arranged opposite to each other, and the fourth moving contact and the fourth stationary contact are arranged opposite to each other, both located within the switching space. By controlling the contact and separation of the third moving contact and the third stationary contact, and the contact and separation of the fourth moving contact and the fourth stationary contact, the switching on and off can be completed.

[0047] In one embodiment, such as Figure 6 and Figure 7 As shown, the DC contactor also includes a drive assembly connecting the first moving contact block 13 and the second moving contact block 23; The driving component is used to drive the first movable contact 13 to move closer to or away from the first stationary contact 11 and the second stationary contact 12, so as to control the contact or separation between the third contact surface 131 and the first contact surface 111 and the second contact surface 121. The driving component is also used to drive the second movable contact 23 to move closer to or away from the third stationary contact 21 and the fourth stationary contact 22, so as to control the contact or separation between the sixth contact surface and the fourth contact surface and the fifth contact surface. Understandably, the driving component can precisely control the movement of the first movable contact 13 and the second movable contact 23, so that the first movable contact 13 accurately moves closer to or away from the first stationary contact 11 and the second stationary contact 12, and so that the second movable contact 23 accurately moves closer to or away from the third stationary contact 21 and the fourth stationary contact 22, thereby achieving precise docking or separation between the contacts.

[0048] In another embodiment, such as Figure 6 and Figure 7As shown, the driving assembly includes a first driving member 50 and a second driving member 60. The first driving member 50 is connected to the first contact unit 10, and the second driving member 60 is connected to the second contact unit 20. The first driving member 50 and the second driving member 60 have the same structure. The first driving member 50 includes an elastic bracket 51 connected to the moving contact unit, a coil 52 connected to the elastic bracket 51, a stationary iron core 53 installed outside the coil 52, a connecting rod 54 passing through the coil 52, and a moving iron core 55 connected to the connecting rod 54. Understandably, an elastic element is installed inside the elastic bracket 51. When the coil 52 is energized, the magnetic attraction between the moving iron core 55 and the stationary iron core 53 causes the moving iron core 55 to overcome the elastic force of the elastic element and move upward, thereby driving the moving contact unit upward through the connecting rod 54 until the first moving contact 133 and the first stationary contact 116 contact, and the second moving contact 134 and the second stationary contact 126 contact, and the main circuit is energized. When coil 52 is de-energized, the elastic element gradually recovers its deformation, providing a repulsive force for the separation of the first moving contact 133 and the first stationary contact 116, as well as the separation of the second moving contact 134 and the second stationary contact 126. This causes the connecting rod 54 to move in the opposite direction, thereby driving the moving contact array to move in the opposite direction until the first moving contact 133 and the first stationary contact 116 are completely separated, as well as the second moving contact 134 and the second stationary contact 126 are completely separated. The magnetic enhancement component 40 can also further increase the electric repulsive force between the contacts, thereby prompting the main circuit to be de-energized more quickly.

[0049] The above are merely embodiments of the DC contactor of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A DC contactor, characterized in that, It includes a first contact bar unit, a second contact bar unit, an arc-shaped connector, and a magnetic enhancement component disposed on the first contact bar unit and the second contact bar unit. The first contact bar unit includes a first stationary contact bar, a second stationary contact bar, and a first movable contact bar. The second contact bar unit includes a third stationary contact bar, a fourth stationary contact bar, and a second movable contact bar. The first stationary contact bar and the second stationary contact bar are arranged on a first straight line, and the first stationary contact bar is located at the first end of the first straight line; the third stationary contact bar and the fourth stationary contact bar are arranged on a second straight line, and the third stationary contact bar is located at the first end of the second straight line; the first straight line, the second straight line, the first moving contact bar, and the second moving contact bar are arranged in parallel; the first moving contact bar and the second moving contact bar are located on a preset plane, and the first stationary contact bar, the second stationary contact bar, the third stationary contact bar, and the fourth stationary contact bar are all located on the same side of the preset plane; The arc-shaped connector is connected between the first end of the first stationary contact bar and the first end of the third stationary contact bar; the first contact surface of the first stationary contact bar and the second contact surface of the second stationary contact bar are arranged opposite to the third contact surface of the first moving contact bar, and the fourth contact surface of the third stationary contact bar and the fifth contact surface of the fourth stationary contact bar are arranged opposite to the sixth contact surface of the second moving contact bar, so as to control the on / off state of the switch by contact or separation between the third contact surface and the first and second contact surfaces, and between the sixth contact surface and the fourth and fifth contact surfaces; The first contact surface, the second contact surface, the third contact surface, the fourth contact surface, the fifth contact surface, and the sixth contact surface form a switching space, and the magnetic enhancement component is located outside the switching space.

2. The DC contactor according to claim 1, characterized in that, The arc-shaped connector includes a connecting part and a first connector and a second connector respectively connected to both ends of the connecting part; the first connector and the second connector are both disposed on the side of the connecting part near the first contact plate unit; and the first connector is connected to the first end of the first stationary contact plate; the second connector is connected to the first end of the third stationary contact plate.

3. The DC contactor according to claim 2, characterized in that, The first connector is connected to the first end of the first stationary contact bar at a first preset angle; the second connector is connected to the first end of the third stationary contact bar at a second preset angle. The connecting portion is arc-shaped; and / or the arc-shaped connector includes a first arc-shaped connecting portion connecting the connecting portion and the first joint, and a second arc-shaped connecting portion connecting the connecting portion and the second joint; The first preset angle and the second preset angle are equal, the arc radii of the first arc connecting part and the second arc connecting part are equal, and the arc radius of the first arc connecting part is greater than or equal to the width of the first static contact bar.

4. The DC contactor according to claim 3, characterized in that, Both the first preset angle and the second preset angle are 0°; The first connector is connected to the first end of the first stationary contact bar, and the second connector is connected to the first end of the third stationary contact bar; or The first connector is connected to the bottom surface of the first end of the first stationary contact bar, and the second connector is connected to the bottom surface of the first end of the third stationary contact bar.

5. The DC contactor according to claim 1, characterized in that, The magnetic enhancement assembly includes a first magnetic enhancement element disposed on a first mounting surface of the first movable contact block, and a second magnetic enhancement element disposed on a second mounting surface of the second movable contact block; the first mounting surface is the end face of the first movable contact block facing away from the third contact surface; the second mounting surface is the end face of the second movable contact block facing away from the sixth contact surface.

6. The DC contactor according to claim 1, characterized in that, The magnetic enhancement assembly includes a third magnetic enhancement element disposed on a third mounting surface of the first stationary contact bar, a fourth magnetic enhancement element disposed on a fourth mounting surface of the second stationary contact bar, a fifth magnetic enhancement element disposed on a fifth mounting surface of the third stationary contact bar, and a sixth magnetic enhancement element disposed on a sixth mounting surface of the fourth stationary contact bar. The third mounting surface is the end face of the first stationary contact bar that is opposite to the first contact surface; the fourth mounting surface is the end face of the second stationary contact bar that is opposite to the second contact surface; the fifth mounting surface is the end face of the third stationary contact bar that is opposite to the fourth contact surface; and the sixth mounting surface is the fourth mounting surface of the fourth stationary contact bar that is opposite to the fifth contact surface.

7. The DC contactor according to claim 1, characterized in that, With a preset reference axis as the axis of symmetry, the first movable contact row and the second movable contact row are symmetrically arranged, and the first contact row unit and the second contact row unit are symmetrically arranged; the preset reference axis is parallel to the first movable contact row and passes through the midpoint between the first movable contact row and the second movable contact row.

8. The DC contactor according to any one of claims 1 to 7, characterized in that, The first static contact bar includes a first connecting section, a first contact section parallel to the first connecting section, and a first arc-shaped section connecting the first connecting section and the first contact section. The first contact surface is disposed on the end face of the first contact section facing away from the first connecting section. The second static contact bar includes a second connecting section, a second contact section parallel to the second connecting section, and a second arc-shaped section connecting the second connecting section and the second contact section. The third contact surface is disposed on the end face of the second contact section facing away from the second connecting section. The second arc-shaped segment is located on the side of the second stationary contact bar that is closer to the first stationary contact bar; the first arc-shaped segment is located on the side of the first stationary contact bar that is closer to the second stationary contact bar, and the length of the first connecting segment is less than the length of the second connecting segment.

9. The DC contactor according to claim 1, characterized in that, The third contact surface is provided with a first moving contact and a second moving contact. The first contact surface is provided with a first stationary contact arranged opposite to the first moving contact, and the second contact surface is provided with a second stationary contact arranged opposite to the second moving contact. The sixth contact surface is provided with a third moving contact and a fourth moving contact, the fourth contact surface is provided with a third stationary contact arranged opposite to the third moving contact, and the fifth contact surface is provided with a fourth stationary contact arranged opposite to the fourth moving contact. The DC contactor controls the switching on and off by contacting or separating the first moving contact and the first stationary contact, the second moving contact and the second stationary contact, the third moving contact and the third stationary contact, and the fourth moving contact and the fourth stationary contact.

10. The DC contactor according to claim 1, characterized in that, The DC contactor also includes a drive assembly that connects the first moving contact block and the second moving contact block; The driving component is used to drive the first moving contact bar to move closer to or away from the first stationary contact bar and the second stationary contact bar, so as to control the third contact surface to contact or separate from the first contact surface and the second contact surface. The driving component is also used to drive the second moving contact bar to move closer to or away from the third stationary contact bar and the fourth stationary contact bar, so as to control the sixth contact surface to contact or separate from the fourth contact surface and the fifth contact surface.

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