A contactor for a power supply stand for electric vehicle charging stations

Abstract

This utility model relates to a contactor for a power supply base in an electric vehicle charging station. The protruding post on the moving magnetic core and the concave groove on the stationary magnetic core cooperate to position and guide the moving and stationary iron cores during engagement, ensuring accurate connection and reducing vibration and noise during engagement, thus making the contactor's operation more stable and reliable. Simultaneously, the moving and stationary magnetic cores are installed on the inner wall of the coil frame, forming a closed magnetic circuit with the moving and stationary iron cores, effectively reducing magnetic leakage and improving magnetic energy utilization. The contact support has moving contact bridge assemblies on both sides, with contact posts at opposite ends. This layout allows for full contact between the moving contact bridge and the contact post when the contactor is closed, increasing the contact area, reducing contact resistance, and minimizing heat generation and energy loss. Furthermore, the contact spring provides appropriate pressure when the moving contact bridge contacts the contact post, ensuring tight contact.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to a contactor for a power supply base for electric vehicle charging stations. Background Technology

[0002] Driven by global environmental protection and sustainable development concepts, electric vehicles have become the mainstream development direction of the automotive industry, and their market share continues to grow. To meet the increasing charging demand of electric vehicles, the construction scale of charging stations is constantly expanding. The power socket, as a key component connecting the charging equipment and the electric vehicle, directly affects the efficiency and safety of the charging process. The contactor, as the core control element of the power socket, is responsible for controlling the on / off state of the charging circuit, and its performance directly determines the working stability and reliability of the power socket. However, existing contactors lack an effective positioning and guiding mechanism for the moving and stationary iron cores during the attraction process, making them prone to misalignment. Furthermore, the iron core components and magnetic conductor structures of some contactors are poorly designed, failing to form an effective closed magnetic circuit. Additionally, the auxiliary contact bridge and auxiliary stationary contact points of the contactor are not tightly connected and lack effective shielding measures, making signal transmission susceptible to interference from external electromagnetic fields. Moreover, the contactor's housing structure design is not user-friendly, and the component layout is unreasonable. During installation and commissioning, technicians need to spend a lot of time and effort on disassembly and assembly, increasing their workload and operational difficulty. Utility Model Content

[0003] In view of this, the purpose of this utility model is to provide a contactor for a power supply base for electric vehicle charging stations that has stable and reliable operation, high magnetic energy utilization, good contact performance, and convenient installation and debugging.

[0004] To achieve the above objectives, this utility model employs a contactor for a power supply base in an electric vehicle charging station, comprising a housing, inside which are a contact support and a control board. The contact support contains an iron core assembly, which includes a coil frame installed within the contact support. A coil is wound around the coil frame. One end of the coil frame has a moving iron core sleeved on the outer wall of the coil, and the other end has a stationary iron core sleeved on the outer wall of the coil. A return spring is sleeved on the exterior of both the moving and stationary iron cores. Moving and stationary magnetic conductors are respectively installed on the inner walls of the coil frame at the ends where the moving and stationary iron cores are located. A protrusion is provided at one end of the moving magnetic conductor corresponding to the stationary magnetic conductor, and a matching groove is provided on the stationary magnetic conductor corresponding to the protrusion of the moving magnetic conductor. Moving contact bridge assemblies are provided inside both sides of the contact support, and contact posts are provided at opposite ends of the moving contact bridge assemblies.

[0005] The beneficial effects of the above structure are as follows: the convex post on the moving magnetic core and the concave post groove on the stationary magnetic core cooperate with each other to play a positioning and guiding role when the moving iron core and the stationary iron core are attracted, ensuring accurate docking, reducing vibration and noise during the attraction process, and making the contactor's operation more stable and reliable. At the same time, the moving magnetic core and the stationary magnetic core are installed on the inner wall of the coil frame, forming a closed magnetic circuit with the moving iron core and the stationary iron core, which can effectively reduce magnetic leakage and improve the utilization rate of magnetic energy. The contact support has moving contact bridge assemblies set on both sides, and the opposite ends of the moving contact bridge assembly are provided with contact posts. This layout allows the moving contact bridge and the contact post to make full contact when the contactor is closed, increasing the contact area, reducing contact resistance, reducing heat generation and energy loss. In addition, the contact spring can provide appropriate pressure when the moving contact bridge and the contact post are in contact, ensuring tight contact.

[0006] The present invention is further configured such that an auxiliary contact bridge is provided at one end of the moving magnetic conductor near the control board. The auxiliary contact bridge is mounted on the contact support and is connected to the moving magnetic conductor through a first connector. The control board is positioned above the auxiliary contact bridge. Contact points are provided on both sides of the auxiliary contact bridge at one end of the corresponding control board. An auxiliary stationary contact is welded onto the control board. One end of the auxiliary stationary contact is welded to the control board, and the other end covers the contact point provided on the auxiliary contact bridge. By cooperating with the auxiliary contact points at both ends of the auxiliary contact bridge and the auxiliary stationary contact welded to the control board, the switching status information of the contactor can be accurately fed back to the control board when the moving magnet moves. In addition, the auxiliary contact bridge is reliably connected to the moving magnet through the first connector and is mounted on the contact support. This structural design ensures the stability of the auxiliary contact bridge during the movement of the moving magnet. At the same time, one end of the auxiliary stationary contact is welded to the control board, and the other end covers the contact points set on the auxiliary contact bridge. This tight connection method forms a certain shielding effect, which can effectively block the intrusion of external electromagnetic fields, thereby reducing the impact of external electromagnetic interference on signal transmission.

[0007] This utility model further comprises a movable contact bridge assembly including a movable contact bridge disposed at the bottom inner part of the contact support. The movable contact bridge has a boss, and the inner top of the contact support has an abutment corresponding to the boss. A contact spring is disposed between the abutment and the boss. Both ends of the movable contact bridge extend outward from the contact support, and a movable contact corresponding to a contact post is disposed at the end furthest from the control board. The contact post has a stationary contact at the end corresponding to the movable contact bridge where the movable contact is disposed. By providing a boss on the movable contact bridge, a corresponding abutment at the top inner part of the contact support, and a contact spring between them, this structural design allows the contact spring to provide stable and uniform pressure to the movable contact bridge. Simultaneously, the two ends of the movable contact bridge extend outward from the contact support, with a movable contact at the end furthest from the control board and a stationary contact at the corresponding position on the contact post. This layout fully utilizes the internal space of the contact support, making the installation of the movable contact bridge and contact post more compact and reasonable.

[0008] This utility model is further configured with a housing including a base, an upper cover on the base, a middle cover located between the upper cover and the base, a control board mounted on the middle cover, a contact support mounted inside the middle cover, and an iron core assembly disposed within the contact support. The static magnetic conductor within the iron core assembly is connected to the base via a second connector. The contact post is mounted inside the base and extends outward through a contact groove on the base. Connecting blocks are also provided on both sides of the base. The housing employs a layered structure of base, middle cover, and upper cover, with the middle cover located between the upper cover and the base. This layered design effectively disperses the stress generated during equipment operation. Simultaneously, the control board is mounted on the middle cover, the contact support is mounted inside the middle cover, and the iron core assembly is disposed within the contact support. This nested layout ensures fixed and precise relative positions between components. The connecting blocks on both sides of the base facilitate connection between the charging station and other equipment or components. Furthermore, the contact post is mounted inside the base and extends outward through a contact groove on the base, making the connection between the contact post and external circuitry more stable and reliable.

[0009] This invention further includes a permanent magnet within the base, symmetrically arranged on both sides of the contact area between the contact post and the moving contact bridge. The permanent magnet has a chamfer, and the base has a mounting groove corresponding to the permanent magnet. By symmetrically arranging permanent magnets on both sides of the contact area between the contact post and the moving contact bridge, the constant magnetic field generated by the permanent magnet attracts the moving contact bridge when it approaches the contact post, enhancing the attraction between the moving contact bridge and the contacts on the contact post. This additional attraction ensures tight contact between the contacts under various operating conditions, effectively reducing contact resistance. Furthermore, the chamfer on the permanent magnet and the mounting groove on the base corresponding to the chamfer provide precise positioning for the permanent magnet installation.

[0010] This utility model is further configured such that a DIP switch element is provided on the control board, and a transparent cover is provided on the upper cover corresponding to the DIP switch element on the control board, with a protrusion integrally formed on the transparent cover. During the installation and on-site commissioning phases of the charging station, technicians may need to adjust the equipment parameters multiple times according to the actual usage environment. The combined design of the transparent cover and the DIP switch allows technicians to operate the DIP switch directly through the transparent cover without disassembling the equipment casing, quickly completing parameter setting and commissioning work. Furthermore, when it is necessary to open the transparent cover to operate or maintain the DIP switch, the protrusion provides a clear point of leverage for the user's fingers. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model.

[0012] Figure 2 This is a front view of the internal structure of the shell according to an embodiment of the present utility model.

[0013] Figure 3 This is an exploded view of the contact support and core assembly of this utility model embodiment.

[0014] Figure 4 This is an exploded view of the internal assembly structure of the iron core assembly according to an embodiment of this utility model.

[0015] Figure 5 This is a schematic diagram of the assembly of the control board and auxiliary contact bridge according to an embodiment of the present invention.

[0016] Figure 6 This is a schematic diagram of the assembly of the moving contact bridge component and the contact post according to an embodiment of the present invention.

[0017] Figure 7 This is a schematic diagram of the assembly of the base and the permanent magnet in an embodiment of this utility model. Detailed Implementation

[0018] like Figures 1-7As shown, an embodiment of this utility model provides a contactor for a power supply socket for an electric vehicle charging station, including a housing 1. Inside the housing 1, a contact support 2 and a control board 3 are disposed. The contact support 2 contains an iron core assembly 4, which includes a coil frame 41 installed within the contact support 2. A coil 42 is wound on the coil frame 41. One end of the coil frame 41 has a moving iron core 43 sleeved on the outer wall of the coil 42, and the other end has a stationary iron core 44 sleeved on the outer wall of the coil 42. A return spring 45 is jointly sleeved on the outside of both the moving iron core 43 and the stationary iron core 44. The frame 41 has a moving magnetic core 46 and a stationary magnetic core 47 installed on the inner wall of the ends where the moving core 43 and stationary core 44 are located, respectively. The moving magnetic core 46 has a protrusion 48 at one end corresponding to the stationary magnetic core 47, and the stationary magnetic core 47 has a matching concave groove 49 corresponding to the protrusion 48 of the moving magnetic core 46. When the coil is energized, the moving core 43 drives the moving magnetic core 46 to move, so that the protrusion 48 is inserted into the concave groove 49. When the power is off, the return spring 45 resets the moving core 43 and the moving magnetic core 46. The contact support 2 has a moving contact bridge assembly 5 on both sides, and the opposite end of the moving contact bridge assembly 5 has a contact post 6.

[0019] The moving magnetic conductor 46 has an auxiliary contact bridge 7 at one end near the control board 3. The auxiliary contact bridge 7 is mounted on the contact support 2 and is connected to the moving magnetic conductor 46 by a first connector 71, which is a screw. The control board 3 is positioned above the auxiliary contact bridge 7. The two sides of the auxiliary contact bridge 7 have contact points 72 at one end of the control board 3. An auxiliary stationary contact 31 is welded onto the control board 3. One end of the auxiliary stationary contact 31 is welded onto the control board 3, and the other end covers the contact point 72 on the auxiliary contact bridge 7. The auxiliary contact bridge 7 moves with the moving magnetic conductor 46 to make contact with or disconnect from the auxiliary stationary contact 31, which is used to provide feedback on the contactor status.

[0020] The moving contact bridge assembly 5 includes a moving contact bridge 51 disposed at the bottom of the contact support 2. The moving contact bridge 51 is provided with a boss 52. The inner top of the contact support 2 is provided with a contact platform 21 corresponding to the boss 52. A contact spring 53 is provided between the contact platform 21 and the boss 52. Both ends of the moving contact bridge 51 extend outward from the contact support 2, and a moving contact 54 corresponding to the contact post 6 is provided at the end away from the control board 3. The contact post 6 is provided with a stationary contact 61 at the end of the moving contact bridge 51 where the moving contact 54 is provided. The moving contact bridge 51 moves under the elastic force of the contact spring 53 and the drive of the moving magnetic conductor 46, so that the moving contact 54 contacts or disconnects from the stationary contact 61, thereby realizing circuit on / off control.

[0021] The housing 1 includes a base 11 and an upper cover 12 covering the base 11. A middle cover 13 is installed on the base 11 between the upper cover 12 and the base 11. A control board 3 is installed on the middle cover 13. A contact support 2 is installed inside the middle cover 13. An iron core assembly 4 is installed inside the contact support 2. The static magnetic conductor 47 inside the iron core assembly 4 is connected to the base 11 through a second connector 471, which is also a screw. A contact post 6 is installed inside the base 11 and extends outward through a contact groove opened on the base 11. A snap-fit ​​block 14 for connection is also provided on both sides of the base 11.

[0022] The base 11 is also equipped with a permanent magnet 8, which is symmetrically arranged on both sides of the contact area between the contact post 6 and the moving contact bridge 51. The permanent magnet 8 is provided with a chamfer 81, and the base 11 is provided with a mounting groove 15 corresponding to the permanent magnet 8. The permanent magnet 8 is used to keep the moving contact 54 and the stationary contact 61 in an open state when the contactor is de-energized, so as to prevent accidental contact.

[0023] The control board 3 is equipped with a DIP switch element 32. The upper cover 12 is provided with a transparent cover 16 corresponding to the DIP switch element 32 of the control board 3. A protrusion 161 is integrally formed on the transparent cover 16. The transparent cover 16 is used to protect the DIP switch element 32. The protrusion 161 facilitates opening the transparent cover 16 for operation. The contactor is to be used with the power socket for electric vehicle charging stations.

[0024] Of course, in addition to the above embodiments, this utility model may have other various embodiments. Without departing from the essential technical solution of this utility model, those skilled in the art can make various corresponding changes and modifications based on this utility model, and these changes or modifications are equivalent to the technical solution in this patent. Therefore, these corresponding changes and modifications should all fall within the protection scope of the appended claims of this utility model.

Claims

1. A contactor for a power supply socket for an electric vehicle charging station, characterized in that: The device includes a housing, inside which are a contact support and a control board. The contact support contains an iron core assembly, which includes a coil frame installed within the contact support. A coil is wound around the coil frame. One end of the coil frame has a moving iron core sleeved on the outer wall of the coil, and the other end has a stationary iron core sleeved on the outer wall of the coil. A return spring is sleeved on the outside of both the moving and stationary iron cores. Moving and stationary magnetic conductors are respectively installed on the inner walls of the coil frame at the ends where the moving and stationary iron cores are located. A protrusion is provided at one end of the moving magnetic conductor corresponding to the stationary magnetic conductor, and a matching groove is provided at the corresponding end of the stationary magnetic conductor corresponding to the protrusion of the moving magnetic conductor. Moving contact bridge assemblies are provided inside both sides of the contact support, and contact posts are provided at opposite ends of the moving contact bridge assemblies.

2. The contactor for a power supply socket for an electric vehicle charging station according to claim 1, characterized in that: The moving magnetic conductor has an auxiliary contact bridge at one end near the control board. The auxiliary contact bridge is mounted on the contact support and is connected to the moving magnetic conductor via a first connector. The control board is positioned above the auxiliary contact bridge. The auxiliary contact bridge has contact points on both sides at one end of the control board corresponding to the auxiliary contact bridge. An auxiliary stationary contact is welded onto the control board, with one end of the auxiliary stationary contact welded to the control board and the other end covering the contact point on the auxiliary contact bridge.

3. Contactors for power supply sockets for electric vehicle charging stations according to claim 1 or 2, characterized in that: The moving contact bridge assembly includes a moving contact bridge disposed at the bottom inner part of the contact support. The moving contact bridge has a boss, and the inner top of the contact support has a contact platform corresponding to the boss. A contact spring is disposed between the contact platform and the boss. Both ends of the moving contact bridge extend outward from the contact support, and a moving contact corresponding to a contact post is disposed at the end away from the control board. The contact post has a stationary contact at the end corresponding to the moving contact bridge where the moving contact is disposed.

4. The contactor for a power supply socket of an electric vehicle charging station according to claim 3, characterized in that: The housing includes a base and an upper cover on the base. A middle cover is installed on the base between the upper cover and the base. The control board is installed on the middle cover. The contact support is installed inside the middle cover. The iron core assembly is disposed inside the contact support. The static magnetic conductor inside the iron core assembly is connected to the base through a second connector. The contact post is installed inside the base and extends outward through a contact groove opened on the base. The base is also provided with snap-fit ​​blocks on both sides for connection.

5. The contactor for a power supply socket for an electric vehicle charging station according to claim 4, characterized in that: The base is also equipped with a permanent magnet, which is symmetrically arranged on both sides of the contact area between the contact post and the moving contact bridge. The permanent magnet has a chamfer, and the base has a mounting groove corresponding to the permanent magnet.

6. The contactor for a power supply socket for an electric vehicle charging station according to claim 4, characterized in that: The control board is provided with a DIP switch element, and the upper cover is provided with a transparent cover corresponding to the DIP switch element of the control board, and a protrusion is integrally formed on the transparent cover.

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