Movable contact device on a direct current contactor
Patent Information
- Application Number
- CN202521904252.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-04
- Publication Date
- 2026-08-07
- Estimated Expiration
- 2035-09-04
AI Technical Summary
[0003]然而传统的触头接触可靠性差，在频繁通断过程中易出现接触不良，导致电弧产生、触头磨损加剧，并且缺乏有效的缓冲和防护结构，在冲击、振动等工况下，易损坏部件，降低接触器的使用寿命，为了解决上述问题，提出了直流接触器上的动触头装置
该直流接触器上的动触头装置，通过将动触头设置在轴座的正上方，配合卡箍、定位片、定位管等多重定位结构，使动触头在运动过程中位置稳定、轨迹可控，有效避免了因位置偏移导致的触头接触不良问题，显著提升了直流接触器通断电路的可靠性；通过将压簧套接在定位柱表面，可在动触头与静触头接触瞬间提供缓冲力，减轻碰撞冲击，降低触头磨损；通过动轴表面的拉簧配合动铁芯、限位块等结构，能在电磁力消失时可靠带动动触头复位，确保分闸动作迅速、彻底，减少电弧产生时间，提升了装置的安全性和耐久性。
Smart Images
Figure CN224609819U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of DC contactor technology, and in particular to moving contact devices on DC contactors. Background Technology
[0002] A DC contactor is a contactor controlled by a DC coil with a DC core. Its load can be DC or AC. Unlike AC contactors, the core of a DC contactor does not contain eddy currents. Therefore, it is generally made of mild steel or industrial pure iron in a circular shape. Because the attraction coil of a DC contactor is powered by DC, there is no inrush starting current, and the core does not violently impact. DC contactors are widely used in power, rail transportation, and industrial automation to control the switching of DC circuits. The moving contact device, as one of the core components of a DC contactor, directly affects the contactor's reliability, switching capacity, and service life.
[0003] However, traditional contactors have poor reliability and are prone to poor contact during frequent switching, leading to arcing, accelerated contact wear, and lack of effective buffering and protection structures. Under conditions of impact and vibration, they are prone to damage to components and reduce the service life of the contactor. To solve the above problems, a moving contact device for DC contactors has been proposed. Utility Model Content
[0004] The purpose of this application is to provide a moving contact device on a DC contactor, which ensures that the moving contact is in a stable position during movement, avoids poor contact caused by positional deviation, reduces contact wear, and improves the safety and durability of the device.
[0005] The moving contact device on the DC contactor provided in this application adopts the following technical solution: The moving contact device on the DC contactor includes a shaft seat and a moving contact. The moving contact is located directly above the shaft seat. An armature overlaps the upper surface of the moving contact, and a baffle overlaps the upper surface of the armature. A placement groove is formed on the surface of the shaft seat, and a clamp passes through the inside of the placement groove. The moving contact is located inside the clamp. A positioning piece is provided on the lower surface of the moving contact, and a positioning tube is fixedly connected to the surface of the positioning piece. The positioning piece overlaps the upper surface of the placement groove, and an installation groove is formed on the surface of the placement groove. The shaft seat has a fixed internal connection with a positioning post, and a compression spring is sleeved on the surface of the positioning post. An end cap is provided on the lower surface of the shaft seat, and a shaft sleeve is provided directly below the end cap. A protective shell is inserted inside the shaft sleeve, and a moving iron core is inserted inside the protective shell. A moving shaft is inserted inside the moving iron core, and a tension spring is sleeved on the surface of the moving shaft. A fixing groove is provided on the lower surface of the shaft seat, and the moving shaft passes through the fixing groove. A fixing block is provided inside the fixing groove, and the top end of the moving shaft is fixedly connected to the lower surface of the fixing block. A limit block is provided inside the moving iron core, and one end of the moving shaft is fixedly connected to the limit block.
[0006] By adopting the above technical solution, and through multiple positioning structures such as clamps, positioning plates, and positioning tubes, the moving contact is made stable in position and controllable in trajectory during movement, avoiding poor contact caused by positional deviation, and improving the reliability of DC contactor circuit switching. Furthermore, the compression spring sleeved on the surface of the positioning column can provide buffering force at the moment of contact between the moving and stationary contacts, reducing collision impact and contact wear. The tension spring on the surface of the moving shaft, together with the moving iron core, limit block and other structures, can reliably drive the moving contact to reset when the electromagnetic force disappears, ensuring rapid and thorough opening action, reducing arc generation time, and improving the safety and durability of the device.
[0007] Preferably, the surface of the clamp is provided with a groove, and the surface of the baffle is fixedly connected with a block. The block engages inside the groove. There are two sets of blocks and grooves, which are symmetrically arranged on the surface of the clamp.
[0008] By adopting the above technical solution, the cooperation between the clamp surface groove and the baffle block enables a quick and stable connection between components. The two sets of symmetrically arranged grooves and blocks limit the baffle from both sides, preventing the baffle from shifting during the movement of the moving contact. This strengthens the connection stability between the armature, the baffle, and the clamp, thereby ensuring the consistency of the moving contact's trajectory and improving the operating accuracy of the device.
[0009] Preferably, a rivet is fixedly connected to the upper surface of the armature, and a riveting hole is opened on the surface of the baffle. The rivet passes through the inside of the riveting hole, and the armature and the baffle are riveted and fixed by the rivet.
[0010] By adopting the above technical solution, the armature and the baffle are fixed by riveting. Compared with other connection methods, the riveting connection has higher structural strength and connection stability, which can effectively transmit the force when the moving contact moves, prevent the armature and the baffle from loosening during frequent operation, ensure reliable transmission process, and improve the accuracy of DC contactor action response.
[0011] Preferably, a connecting block is fixedly connected to the lower surface of the moving contact, the connecting block is inserted inside the positioning tube, and the compression spring is sleeved on the surface of the positioning tube.
[0012] By adopting the above technical solution, the positioning tube provides additional axial positioning for the moving contact, limiting its radial swing, while the compression spring provides buffering at the moment of contact between the moving contact and the stationary contact, reducing contact collision wear, and assisting the moving contact to reset when separated, optimizing the working state of the contact and extending the service life of the contact.
[0013] Preferably, the moving contact has a U-shaped structure, extending to both sides in an arc shape and having a symmetrical structure. The moving contact is provided with stationary contacts, and there are two sets of stationary contacts, which are symmetrically arranged directly above both ends of the moving contact.
[0014] By adopting the above technical solution, and by setting a U-shaped arc-shaped symmetrical moving contact, coupled with two sets of symmetrical stationary contacts, the contact area is increased, the current distribution is more uniform, the contact resistance is reduced, and contact heating and electrical wear are decreased. The symmetrical layout also makes the moving contact more evenly stressed and its movement more stable, improving the stability and reliability of the circuit switching process.
[0015] Preferably, a contact rod is fixedly connected to the surface of the bearing seat, an auxiliary contact is fixedly connected to the upper surface of the contact rod, and a buffer spring is sleeved on the surface of the auxiliary contact.
[0016] By adopting the above technical solution, the setting of the contact rod, auxiliary contact and buffer spring, the auxiliary contact can be used for signal feedback of circuit on / off status, providing support for intelligent control and status monitoring of DC contactors; the buffer spring can buffer the impact when the auxiliary contact moves, protect the auxiliary contact and related components, and improve the overall functionality and stability of the device.
[0017] Preferably, the surface of the clamp is provided with a movable groove, the movable shaft passes through the inside of the movable groove, and the surface of the end cap is provided with a connection port, the movable shaft passes through the inside of the connection port.
[0018] By adopting the above technical solution, the clamp movable groove provides movement space for the moving shaft, and the end cover connection port limits and guides the moving shaft. The two work together to ensure that the moving shaft has the necessary degree of freedom of movement during transmission without significant deviation, ensuring the accuracy of the transmission of the moving iron core and moving shaft to the moving contact, making the movement of the moving contact precisely matched with the electromagnetic drive, and improving the working coordination of the DC contactor.
[0019] Preferably, a fixing plate is fixedly connected to the surface of the moving shaft, and a through hole is provided on the surface of the fixing plate so that the tension spring passes through the surface of the fixing plate; By adopting the above technical solution, the moving shaft surface fixing plate is used in conjunction with the tension spring, which passes through the through hole of the fixing plate. The elastic force of the tension spring can be used to store elastic potential energy after the moving contact completes the closing action. When the moving contact is opened, the energy is released to assist the moving contact in quickly resetting, thus optimizing the power transmission and action rhythm of the moving contact opening and closing, and improving the response speed and action reliability of the DC contactor.
[0020] In summary, this application includes at least one of the following beneficial technical effects: The moving contact device on this DC contactor, by positioning the moving contact directly above the shaft seat and using multiple positioning structures such as clamps, positioning plates, and positioning tubes, ensures stable position and controllable trajectory of the moving contact during movement. This effectively avoids poor contact caused by positional deviation and significantly improves the reliability of the DC contactor in switching circuits. By sleeved a compression spring on the surface of the positioning post, a buffering force is provided at the moment of contact between the moving and stationary contacts, reducing impact and contact wear. Through the tension spring on the surface of the moving shaft, in conjunction with the moving iron core, limit block, and other structures, the moving contact can be reliably reset when the electromagnetic force disappears, ensuring rapid and thorough opening action, reducing arc generation time, and improving the safety and durability of the device. Attached Figure Description
[0021] Figure 1 This is a three-dimensional structural diagram of the present application. Figure 2 This is a three-dimensional structural diagram of the bearing seat of this application; Figure 3 This is a structural schematic diagram of the cross-section of the bearing seat in this application; Figure 4 For this application Figure 3 Enlarged structural diagram at point A; Figure 5 This is a structural schematic diagram of the cross-section of the moving iron core in this application.
[0022] In the picture: 1. Shaft seat; 2. Moving contact; 3. Armature; 4. Baffle; 5. Clamp; 6. Positioning plate; 7. Rivet; 8. Riveting hole; 9. Slot; 10. Block; 11. Connecting block; 12. Positioning tube; 13. Movable slot; 14. Fixed slot; 15. Placement slot; 16. Mounting slot; 17. Positioning post; 18. Compression spring; 19. Contact top rod; 20. Auxiliary contact; 21. End cover; 22. Connection port; 23. Shaft sleeve; 24. Protective shell; 25. Moving iron core; 26. Limiting block; 27. Moving shaft; 28. Fixed block; 29. Tension spring; 30. Fixed plate; 31. Buffer spring; 32. Stationary contact. Detailed Implementation
[0023] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.
[0024] Example 1: Moving contact device on a DC contactor, refer to Figure 1 , Figure 2 and Figure 5The moving contact 2 device on the DC contactor includes a bearing 1 and a moving contact 2. The moving contact 2 is positioned directly above the bearing 1. An armature 3 overlaps on the upper surface of the moving contact 2, and a baffle 4 overlaps on the upper surface of the armature 3. A placement groove 15 is formed on the surface of the bearing 1, and a clamp 5 passes through the inside of the placement groove 15. The moving contact 2 is positioned inside the clamp 5. A positioning piece 6 is provided on the lower surface of the moving contact 2, and a positioning tube 12 is fixedly connected to the surface of the positioning piece 6. By positioning the moving contact 2 directly above the bearing 1... With the help of multiple positioning structures such as clamp 5, positioning piece 6, and positioning tube 12, the moving contact 2 is kept stable and its trajectory is controllable during movement, effectively avoiding poor contact caused by positional deviation and significantly improving the reliability of the DC contactor's circuit switching. The positioning piece 6 overlaps the upper surface of the placement groove 15, and the surface of the placement groove 15 has an installation groove 16. The installation groove 16 is fixedly connected to the inside of the installation groove 16, and a compression spring 18 is sleeved on the surface of the positioning post 17. By sleeved with the compression spring 18... On the surface of the positioning post 17, a buffer force is provided at the moment of contact between the moving contact 2 and the stationary contact 32 to reduce collision impact and reduce contact wear. An end cover 21 is provided on the lower surface of the bearing seat 1, and a bushing 23 is provided directly below the end cover 21. A protective shell 24 is installed inside the bushing 23, and a moving iron core 25 is installed inside the protective shell 24. A moving shaft 27 is installed inside the moving iron core 25, and a tension spring 29 is sleeved on the surface of the moving shaft 27. The tension spring 29 on the surface of the moving shaft 27 cooperates with the moving iron core 25 and the limiting block 2. The structure of the 6th type can reliably drive the moving contact 2 to reset when the electromagnetic force disappears, ensuring that the opening action is rapid and thorough, reducing the arc generation time, and improving the safety and durability of the device. The lower surface of the shaft seat 1 is provided with a fixing groove 14, the moving shaft 27 passes through the inside of the fixing groove 14, the inside of the fixing groove 14 is provided with a fixing block 28, the top end of the moving shaft 27 is fixedly connected to the lower surface of the fixing block 28, the inside of the moving iron core 25 is provided with a limit block 26, and one end of the moving shaft 27 is fixedly connected to the limit block 26.
[0025] Please see Figure 1 , Figure 2 and Figure 3The clamp 5 has a groove 9 on its surface, and a block 10 is fixedly connected to the surface of the baffle 4. The block 10 engages inside the groove 9. There are two sets of blocks 10 and grooves 9, symmetrically arranged on the surface of the clamp 5. The cooperation between the groove 9 on the surface of the clamp 5 and the block 10 on the baffle 4 achieves a quick and stable connection between the components. The two sets of symmetrically arranged grooves 9 and blocks 10 limit the baffle 4 from both sides, preventing the baffle 4 from shifting during the movement of the moving contact 2. This strengthens the connection stability between the armature 3, the baffle 4, and the clamp 5, thereby ensuring the consistency of the movement trajectory of the moving contact 2 and improving the operating accuracy of the device. A rivet 7 is fixedly connected to the upper surface of the armature 3, and a riveting hole 8 is opened on the surface of the baffle 4. The rivet 7 passes through the riveting hole 8, and the armature 3 and the baffle 4 are riveted together by the rivet 7. The armature 3 and the baffle 4 are fixed by riveting with rivets 7. Compared with other connection methods, the rivet 7 connection has higher structural strength and connection stability, which can effectively transmit the force when the moving contact 2 moves, prevent the armature 3 and the baffle 4 from loosening during frequent operation, ensure reliable transmission process, and improve the accuracy of DC contactor action response. A connecting block 11 is fixedly connected to the lower surface of the moving contact 2. The connecting block 11 passes through the inside of the positioning tube 12. The compression spring 18 is sleeved on the surface of the positioning tube 12. The positioning tube 12 provides additional axial positioning for the moving contact 2 and restricts its radial swing. The compression spring 18 can provide buffer at the moment of contact between the moving contact 2 and the stationary contact 32, reduce contact collision wear, and assist the moving contact 2 to reset when separated, optimize the working state of the contact, and extend the service life of the contact.
[0026] Please see Figure 2 , Figure 3 and Figure 4 The moving contact 2 has a U-shaped structure, extending to both sides in an arc shape and with a symmetrical structure. The moving contact 2 is provided with stationary contacts 32. There are two sets of stationary contacts 32, which are symmetrically arranged directly above both ends of the moving contact 2. By setting the moving contact 2 with a U-shaped arc symmetrical structure, and matching it with two sets of symmetrical stationary contacts 32, the contact area of the contact is increased, the current distribution is more uniform, the contact resistance is reduced, and the contact heating and electrical wear are reduced. The symmetrical layout also makes the moving contact 2 more evenly stressed and its movement more stable, improving the stability and reliability of the circuit switching process. The surface of the bearing 1 is fixedly connected to the contact rod 19, and the upper surface of the contact rod 19 is fixedly connected to the auxiliary contact 20. The surface of the auxiliary contact 20 is fitted with a buffer spring 31. The arrangement of the contact rod 19, the auxiliary contact 20 and the buffer spring 31 allows the auxiliary contact 20 to be used for signal feedback of the circuit switching state, providing support for the intelligent control and status monitoring of the DC contactor. The buffer spring 31 can buffer the impact when the auxiliary contact 20 moves, protecting the auxiliary contact 20 and related components, and improving the overall functionality and stability of the device.
[0027] Please see Figure 2 , Figure 4 and Figure 5 The clamp 5 has a movable groove 13 on its surface, and the moving shaft 27 passes through the movable groove 13. The end cover 21 has a connection port 22 on its surface, and the moving shaft 27 passes through the connection port 22. The movable groove 13 of the clamp 5 provides movement space for the moving shaft 27, and the connection port 22 of the end cover 21 limits and guides the moving shaft 27. The two work together to ensure that the moving shaft 27 has the necessary degree of freedom of movement during transmission without significant deviation, ensuring the accuracy of the transmission of the moving iron core 25 and the moving shaft 27 to the moving contact 2, and making the action of the moving contact 2 precisely matched with the electromagnetic drive. To improve the coordination of DC contactor operation, a fixing plate 30 is fixedly connected to the surface of the moving shaft 27. The surface of the fixing plate 30 has a through hole so that the tension spring 29 can pass through the surface of the fixing plate 30. The fixing plate 30 on the surface of the moving shaft 27 cooperates with the tension spring 29. The tension spring 29 passes through the through hole of the fixing plate 30. The elastic force of the tension spring 29 can be used to store elastic potential energy after the moving contact 2 completes the closing action. When opening, the energy is released to assist the moving contact 2 to quickly reset, optimize the power transmission and action rhythm of the opening and closing of the moving contact 2, and improve the response speed and action reliability of the DC contactor.
[0028] The implementation principle of this application embodiment is as follows: First, the prepared components are sorted and inspected to ensure that there are no defects in the size and appearance quality of each component. Then, the clamp 5 is inserted into the placement groove 15 of the shaft seat 1. Then, the compression spring 18 is installed in the groove 16 of the placement groove 15 on the surface of the positioning post 17. The positioning tube 12 on the lower surface of the positioning piece 6 is inserted into the compression spring 18. Then, the moving contact 2 is attached to the surface of the positioning piece 6, so that the connecting block 11 is inserted into the positioning tube 12. The armature 3 and the baffle 4 are installed in sequence to complete the installation process of the moving contact 2. When the DC contactor coil is energized, it generates an electromagnetic force to attract the moving iron core 25. The moving iron core 25 drives the moving shaft 27 to move. The moving shaft 27 stretches the tension spring 29 through the fixing plate 30. At the same time, the moving shaft 27 drives the moving contact 2 inside the clamp 5 to move towards the stationary contact 32 through the shaft seat 1. The moving contact 2 is constrained by the positioning structure such as the clamp 5 and the positioning tube 12. The contactor precisely contacts the stationary contact 32 to achieve circuit conduction. During this process, the compression spring 18 is compressed to buffer the contact collision, and the auxiliary contact 20 moves with the moving contact 2, providing feedback on the closing signal. The buffer spring 31 also synchronously buffers the impact of the auxiliary contact 20. Then, the DC contactor coil is de-energized, the electromagnetic force disappears, the tension spring 29 releases the stored elastic potential energy, pulling the moving shaft 27 to move in the opposite direction, causing the moving iron core 25 to reset. The moving shaft 27 pulls the moving contact 2 and the stationary contact 32 apart through the clamp 5 inside the shaft seat 1. The compression spring 18 assists the moving contact 2 to quickly reset, and the auxiliary contact 20 resets synchronously, providing feedback on the opening signal. All components return to their initial positions, waiting for the next closing command. Throughout the process, the clamp 5, the slot 9, the rivet 7 and other connecting structures ensure the relative position stability of the components, the positioning tube 12, the movable slot 13 and other structures ensure accurate movement trajectory, and the multiple buffer structures reduce impact wear, ensuring that the DC contactor's switching action is stable, reliable and efficient.
Claims
1. A moving contact device on a DC contactor, comprising a bearing (1) and a moving contact (2), characterized in that: The moving contact (2) is located directly above the bearing seat (1). An armature (3) overlaps the upper surface of the moving contact (2). A baffle (4) overlaps the upper surface of the armature (3). A placement groove (15) is provided on the surface of the bearing seat (1). A clamp (5) passes through the inside of the placement groove (15). The moving contact (2) is located inside the clamp (5). A positioning piece (6) is provided on the lower surface of the moving contact (2). A positioning tube (12) is fixedly connected to the surface of the positioning piece (6). The positioning piece (6) overlaps the upper surface of the placement groove (15). An installation groove (16) is provided on the surface of the placement groove (15). A positioning column (17) is fixedly connected inside the installation groove (16). A compression spring (18) is sleeved on the surface of the positioning post (17). An end cap (21) is provided on the lower surface of the bearing seat (1). A bushing (23) is provided directly below the end cap (21). A protective shell (24) is provided inside the bushing (23). A moving iron core (25) is provided inside the protective shell (24). A moving shaft (27) is provided inside the moving iron core (25). A tension spring (29) is sleeved on the surface of the moving shaft (27). A fixing groove (14) is provided on the lower surface of the bearing seat (1). The moving shaft (27) is inserted inside the fixing groove (14). A fixing block (28) is provided inside the fixing groove (14). The top end of the moving shaft (27) is fixedly connected to the lower surface of the fixing block (28). A limit block (26) is provided inside the moving iron core (25). One end of the moving shaft (27) is fixedly connected to the limit block (26).
2. The moving contact device on a DC contactor according to claim 1, characterized in that: The clamp (5) has a slot (9) on its surface, and the baffle (4) has a block (10) fixedly connected to its surface. The block (10) is engaged inside the slot (9). There are two sets of blocks (10) and slots (9), and they are symmetrically arranged on the surface of the clamp (5).
3. The moving contact device on a DC contactor according to claim 1, characterized in that: The upper surface of the armature (3) is fixedly connected with a rivet (7), and the surface of the baffle (4) is provided with a riveting hole (8). The rivet (7) passes through the inside of the riveting hole (8), and the armature (3) and the baffle (4) are riveted and fixed by the rivet (7).
4. The moving contact device on a DC contactor according to claim 1, characterized in that: The lower surface of the moving contact (2) is fixedly connected to a connecting block (11), the connecting block (11) is inserted inside the positioning tube (12), and the compression spring (18) is sleeved on the surface of the positioning tube (12).
5. The moving contact device on a DC contactor according to claim 1, characterized in that: The moving contact (2) has a U-shaped structure, extends to both sides in an arc shape, and has a symmetrical structure. The moving contact (2) is provided with stationary contacts (32). There are two sets of stationary contacts (32), which are symmetrically arranged directly above the two ends of the moving contact (2).
6. The moving contact device on a DC contactor according to claim 1, characterized in that: The surface of the bearing seat (1) is fixedly connected to a contact rod (19), the upper surface of the contact rod (19) is fixedly connected to an auxiliary contact (20), and the surface of the auxiliary contact (20) is sleeved with a buffer spring (31).
7. The moving contact device on a DC contactor according to claim 1, characterized in that: The clamp (5) has a movable groove (13) on its surface, and the movable shaft (27) passes through the inside of the movable groove (13). The end cap (21) has a connection port (22) on its surface, and the movable shaft (27) passes through the inside of the connection port (22).
8. The moving contact device on a DC contactor according to claim 1, characterized in that: A fixing plate (30) is fixedly connected to the surface of the moving shaft (27), and a through hole is provided on the surface of the fixing plate (30) so that the tension spring (29) passes through the surface of the fixing plate (30).