Structure for improving contact stability of moving contact and static contact of contactor
By setting up structures such as a magnetic attraction mechanism and an overtravel spring in the contactor, the problem of electric repulsion between the moving contact and the static contact is solved, the stability and safety of the contactor are improved, and the service life is extended.
Patent Information
- Application Number
- CN202422628122.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-29
- Publication Date
- 2025-09-05
- Estimated Expiration
- 2034-10-29
AI Technical Summary
In existing contactors, there is an electrical repulsion between the moving contact and the static contact, which easily causes a gap between the moving contact and the static contact, thus shortening the service life of the contactor.
A magnetic attraction mechanism is set on the moving contact, including an upper armature and a lower armature, to form a closed magnetic circuit to offset the electric repulsion, and the position of the moving contact is stabilized by structures such as a movable frame and an overtravel spring, reducing the probability of movement between the moving contact and the static contact.
Effectively reduce the probability of arc gap between the moving contact and the static contact, improve the service life and safety of the contactor, and reduce the risk of leakage.
Smart Images
Figure CN223308931U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of contactor structures, and in particular to a structure for improving the contact stability of moving and static contacts of a contactor. Background Art
[0002] Contactors are widely used switching devices with advantages such as strong power-off capability, rapid operation, and safe operation. With the increasing degree of industrial automation, the performance requirements for contactors are becoming increasingly stringent, especially for the contact stability of the moving and static contacts.
[0003] The existing contactor includes a moving contact and two static contacts. The two static contacts are fixed and connected to the power supply. The contactor controls the movement of the moving contact so that the moving contact can abut against the two static contacts, connecting the moving contact to the two static contacts to achieve the effect of connecting the circuit.
[0004] The above-mentioned related technical solutions have the following defects: when current passes through the moving contact and the static contact, there is an electric repulsion between the moving contact and the static contact, which easily pushes the moving contact, causing a gap between the moving contact and the static contact, resulting in an arc gap, which affects the service life of the contactor. Utility Model Content
[0005] In order to reduce the probability of arc gap between the moving contact and the static contact, the present application provides a structure for improving the contact stability of the moving and static contacts of a contactor.
[0006] The present application provides a structure for improving the contact stability of the moving and static contacts of a contactor, which adopts the following technical solutions:
[0007] A structure for improving the contact stability of the moving and static contacts of a contactor includes a movable frame, a moving contact, a driving mechanism, two static contacts and a magnetic attraction mechanism. The moving contact is slidably connected to the movable frame, the static contact is fixedly arranged, the moving contact is used to contact the two static contacts at the same time, the driving mechanism is used to drive the movable frame to move, and the magnetic attraction mechanism includes an upper armature and a lower armature. The upper armature is fixed on the movable frame, and the lower armature is a semi-enclosed frame and is sleeved outside the moving contact.
[0008] By adopting the above technical solution, by arranging a magnetic attraction mechanism on the moving contact, when the moving contact is connected to the static contact, a closed magnetic circuit is generated on the upper armature and the lower armature, thereby generating a magnetic force that attracts each other between the upper armature and the lower armature. When an electric repulsion force is generated on the moving contact, the magnetic attraction force between the upper armature and the lower armature can offset the electric repulsion force, thereby reducing the probability of the moving contact moving relative to the static contact and reducing the probability of an arc gap between the moving contact and the static contact.
[0009] Optionally, the movable frame includes a connecting plate and multiple vertical plates, the vertical plates are arranged on both sides of the moving contact, the connecting plate is vertically connected to the vertical plates, the upper armature is arranged parallel to the connecting plate, the upper armature is fixed on the vertical plates, the connecting plate, the vertical plates and the upper armature form a rectangular frame structure and are mounted outside the moving contact.
[0010] By adopting the above technical solution, multiple vertical plates are arranged on the connecting plate, so that the vertical plates are stuck on the opposite sides of the moving contact, so that the moving contact is slidably connected to the movable frame, and an upper armature is arranged on the side of the moving contact away from the connecting plate. When power is applied to the moving contact, the lower armature drives the moving contact to generate a magnetic attraction force toward the upper armature. When the connection between the moving contact and the static contact needs to be disconnected, the movable frame is moved so that the upper armature can abut against the moving contact and push the moving contact, so that the moving contact is disconnected from the static contact.
[0011] Optionally, the movable frame is made of insulating material.
[0012] By adopting the above technical solution and using insulating material to make the movable frame, when the moving contact is connected to the static contact and energized, the probability of the current on the moving contact being transmitted to the movable frame and the driving mechanism can be reduced, thereby reducing the risk of leakage.
[0013] Optionally, an overtravel spring is provided between the moving contact and the connecting plate, the overtravel spring is perpendicular to the connecting plate, one end of the overtravel spring abuts against the connecting plate, and the other end abuts against the moving contact.
[0014] By adopting the above technical solution, an overtravel spring is provided between the moving contact and the connecting plate. When the driving mechanism drives the movable frame to move, the movable frame drives the moving contact to approach and abut against the static contact. When the movement accuracy error of the driving mechanism is large, the moving contact can squeeze the overtravel spring and slide relative to the movable frame when abutting against the static contact, thereby reducing the chance of excessive force on the moving contact and the static contact and damage.
[0015] Optionally, a plurality of external clamping blocks are provided on the moving contact, and the end of the overtravel spring is arranged in a space enclosed by the external clamping blocks.
[0016] By adopting the above technical solution, by arranging multiple external clamping blocks on the moving contact, the length direction of the external clamping blocks is parallel to the overtravel spring, and the external clamping blocks can be clamped on the outside of the overtravel spring, thereby reducing the probability of the overtravel spring position being skewed.
[0017] Optionally, an inner clamping block is provided on the connecting plate, and the inner clamping block is inserted into the end of the overtravel spring.
[0018] By adopting the above technical solution, an internal clamping block is set on the connecting plate, and the internal clamping block is inserted into the overtravel spring. The internal clamping block has the effect of clamping the overtravel spring, which can improve the stability of the connection between the overtravel spring and the connecting plate.
[0019] Optionally, a positioning seat is provided on the moving contact, a through hole is opened on the upper armature, and the positioning seat is used to be inserted into the through hole.
[0020] By adopting the above technical solution, multiple upper armatures are provided, and the positioning seat is located in the gap between two adjacent upper armatures. By providing the positioning seat on the moving contact, the positioning seat is inserted into the through hole of the upper armature, so that the positioning seat plays a guiding role, reducing the chance of horizontal slippage and skewness of the moving contact on the movable frame.
[0021] Optionally, a hook is provided on the moving contact, a slide groove is provided on the vertical plate, and the hook extends from the slide groove.
[0022] By adopting the above technical solution, by setting a hook on the moving contact, when the driving mechanism fails, the movable frame is difficult to move. At this time, the user can move the hook through the insulating part to disconnect the moving contact from the static contact, thereby improving the safety of use and being able to disconnect the moving contact and the static contact in time.
[0023] In summary, the beneficial technical effects of this application are:
[0024] 1. By providing a magnetic attraction mechanism on the moving contact, when the moving contact is connected to the stationary contact, a closed magnetic circuit is generated on the upper and lower armatures, thereby generating a magnetic force of attraction between the upper and lower armatures. When an electric repulsion is generated on the moving contact, the magnetic attraction between the upper and lower armatures can offset the electric repulsion, thereby reducing the probability of the moving contact moving relative to the stationary contact and the probability of an arc gap between the moving and stationary contacts.
[0025] 2. By providing multiple vertical plates on the connecting plate, the vertical plates are clamped on opposite sides of the moving contact, so that the moving contact is slidably connected to the movable frame. By providing an upper armature on the side of the moving contact away from the connecting plate, when the moving contact is energized, the lower armature drives the moving contact to generate a magnetic attraction force toward the upper armature. When the connection between the moving contact and the static contact needs to be disconnected, the movable frame is moved so that the upper armature can abut against the moving contact and push the moving contact, thereby disconnecting the moving contact from the static contact.
[0026] 3. By arranging an overtravel spring between the moving contact and the connecting plate, when the driving mechanism drives the movable frame to move, the movable frame drives the moving contact to approach and abut against the static contact. When the movement accuracy error of the driving mechanism is large, the moving contact can squeeze the overtravel spring and slide relative to the movable frame when abutting against the static contact, thereby reducing the chance of excessive force and damage to the moving contact and the static contact. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application.
[0028] Figure 2It is a structural schematic diagram of the movable frame of an embodiment of the present application.
[0029] Figure 3 Schematic diagram of the position of the overtravel spring in an embodiment of the present application.
[0030] Figure 4 It is a schematic diagram of the position of the magnetic attraction mechanism of an embodiment of the present application.
[0031] Figure 5 It is a structural diagram of the moving contact of an embodiment of the present application.
[0032] Figure 6 It is a schematic diagram of the position of the positioning seat of an embodiment of the present application.
[0033] Figure 7 This is a schematic diagram of the position of the inner card block in an embodiment of the present application.
[0034] Figure 8 This is a schematic diagram of the position of the external card block in an embodiment of the present application.
[0035] Figure numerals: 1. movable frame; 11. connecting plate; 111. inner clamping block; 12. vertical plate; 121. through groove; 2. moving contact; 21. overtravel spring; 22. hook; 23. positioning seat; 24. outer clamping block; 3. driving mechanism; 31. frame; 32. driving member; 33. moving rod; 4. static contact; 5. magnetic attraction mechanism; 51. upper armature; 52. lower armature. DETAILED DESCRIPTION
[0036] The present application is further described in detail below with reference to the accompanying drawings.
[0037] The present application discloses a structure for improving the contact stability of the moving and static contacts of a contactor. Figure 1 and Figure 2 , including a movable frame 1, a moving contact 2, a driving mechanism 3 and two static contacts 4. The moving contact 2 and the static contact 4 are made of conductors. The two static contacts 4 are energized and fixed. The moving contact 2 is connected to the movable frame 1. The moving contact 2 is arranged below the static contact 4. The driving mechanism 3 is connected to the movable frame 1. The driving mechanism 3 is used to drive the movable frame 1 to move back and forth in a straight line. The movable frame 1 can drive the moving contact 2 to move, so that the moving contact 2 contacts with the two static contacts 4 at the same time, so that a current path is formed between the static contact 4 and the moving contact 2.
[0038] Reference Figure 2 、 Figure 3 and Figure 4The two static contacts 4 are arranged flush with each other, and the movable contact 2 is configured as a plate-like structure. The movable frame 1 includes a connecting plate 11 and multiple vertical plates 12. The connecting plate 11 is arranged below the movable contact 2, and the vertical plates 12 are arranged on both sides of the movable contact 2. The vertical plates 12 are perpendicular to the connecting plate 11 and connected to each other. An overtravel spring 21 is provided between the movable contact 2 and the connecting plate 11. The overtravel spring 21 is perpendicular to the connecting plate 11, with one end of the overtravel spring 21 abutting against the connecting plate 11 and the other end abutting against the movable contact 2. When the driving mechanism 3 drives the movable frame 1 to move, the movable frame 1 drives the movable contact 2 and causes it to abut against the static contact 4. If the driving mechanism 3 has poor operating accuracy and the driving mechanism 3 moves too much, the movable frame 1 can continue to move. At this time, the connecting plate 11 and the movable contact 2 jointly compress the overtravel spring 21, allowing the movable contact 2 to slide within the movable frame 1, thereby reducing the chance of excessive force on the movable contact 2 and the static contact 4 and causing damage. The movable frame 1 can be made of insulating material. When current flows through the moving contact 2, the probability of current being conducted along the movable frame 1 and the driving mechanism 3 can be reduced, thereby reducing the risk of leakage.
[0039] Reference Figure 4 、 Figure 5 and Figure 6 A magnetic attraction mechanism 5 is provided on the movable frame 1 and the movable contact 2. The magnetic attraction mechanism 5 includes an upper armature 51 and a lower armature 52. The lower armature 52 is a semi-enclosed frame structure, and the upper armature 51 is a flat plate structure. The upper armature 51 is mounted on the vertical plate 12. The upper armature 51, the vertical plate 12, and the connecting plate 11 form a frame structure and are sleeved outside the movable contact 2. The vertical plate 12 is provided with a through slot 121, and a mounting plate is clamped in the through slot 121. The upper armature 51 is fixed to the mounting plate. The lower armature 52 is sleeved outside the movable contact 2. When current flows through the movable contact 2, a closed magnetic circuit is formed between the upper armature 51 and the lower armature 52, generating a magnetic attraction force between the upper armature 51 and the lower armature 52. When the moving contact 2 is electrically connected to the static contact 4, there is an electric repulsion between the moving contact 2 and the static contact 4, and the moving contact 2 is difficult to close with the static contact 4. When a gap is generated between the moving contact 2 and the static contact 4, an arc is easily generated between the moving contact 2 and the static contact 4, and abnormal phenomena such as high temperature are generated, which is not conducive to the service life of the moving contact 2 and the static contact 4. By setting the magnetic attraction mechanism 5, when current passes through the moving contact 2, an electromagnetic force is generated between the upper armature 51 and the lower armature 52, so that there is a force on the moving contact 2 pointing to the upper armature 51, thereby reducing the probability of the moving contact 2 moving to the side away from the static contact 4.
[0040] Reference Figure 6 、 Figure 7 and Figure 8The connecting plate 11 is provided with an inner clamping block 111, and the movable contact 2 is provided with multiple outer clamping blocks 24. One end of the overtravel spring 21 is sleeved outside the inner clamping block 111, and the other end of the overtravel spring 21 is located in the space surrounded by the multiple outer clamping blocks 24. The inner clamping block 111 and the outer clamping block 24 clamp the overtravel spring 21, reducing the chance of the overtravel spring 21 tilting, ensuring that the overtravel spring 21 always provides support for the movable contact 2 in the direction of the static contact 4. A positioning seat 23 is provided on the end of the movable contact 2 away from the overtravel spring 21. The upper armature 51 has a through hole formed in the gap between two adjacent upper armatures 51. The positioning seat 23 can be inserted into the gap between the two upper armatures 51. The positioning seat 23 serves as a positioning function, reducing the chance of the movable contact 2 sliding horizontally on the movable frame 1. This ensures that both sides of the movable contact 2 abut against the static contact 4 when the movable frame 1 moves up and down.
[0041] Reference Figure 1 and Figure 2 The driving mechanism 3 includes a frame 31, a driving member 32, and a movable rod 33. The frame 31 is arranged horizontally. The driving member 32 can be a hydraulic cylinder or a pneumatic cylinder. One end of the driving member 32 is fixed to the frame 31, and the other end is connected to the movable rod 33. The movable rod 33 is connected to the connecting plate 11. The driving member 32 drives the movable rod 33 by telescoping, thereby enabling the movable frame 1 to reciprocate along the length direction of the driving member 32.
[0042] Reference Figure 2 The movable contact 2 is provided with a hook 22, and a slide slot is provided on the vertical plate 12. The hook 22 extends through the slide slot to the outside of the movable frame 1. As the movable contact 2 slides on the movable frame 1, the hook 22 acts as a locking guide, allowing the movable contact 2 to slide back and forth in the vertical direction, reducing the chance of the movable contact 2 tilting and failing to simultaneously contact the two static contacts 4. If the driving member 32 malfunctions and becomes inoperable, the movable frame 1 will be difficult to operate. The user can control the movement of the movable contact 2 through the hook 22, thereby improving the safety of the movable contact 2 when connecting with the static contacts 4.
[0043] The implementation principle of the embodiment of the present application is: by slidingly connecting the moving contact 2 on the movable frame 1, the driving mechanism 3 can drive the movable frame 1 and the moving contact 2 to move vertically back and forth, so that the moving contact 2 can abut against the two static contacts 4 and connect the circuit. When current flows through the moving contact 2, there is an electric repulsion between the moving contact 2 and the static contact 4, and a gap may be generated between the moving contact 2 and the static contact 4, causing an arc, causing adverse effects. By arranging a magnetic attraction mechanism 5 on the moving contact 2, when the moving contact 2 is energized, the moving contact 2 is supported by the electromagnetic force, thereby reducing the probability of a gap between the moving contact 2 and the static contact 4.
[0044] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A structure for improving the contact stability of the moving and static contacts of a contactor, characterized by: The invention comprises a movable frame (1), a movable contact (2), a driving mechanism (3), two static contacts (4) and a magnetic attraction mechanism (5), wherein the movable contact (2) is slidably connected to the movable frame (1), the static contact (4) is fixedly arranged, the movable contact (2) is used to contact the two static contacts (4) at the same time, the driving mechanism (3) is used to drive the movable frame (1) to move, and the magnetic attraction mechanism (5) comprises an upper armature (51) and a lower armature (52), the upper armature (51) is fixed to the movable frame (1), and the lower armature (52) is a semi-enclosed frame and is sleeved outside the movable contact (2).
2. The structure for improving the contact stability of the moving and static contacts of a contactor according to claim 1, characterized in that: The movable frame (1) includes a connecting plate (11) and a plurality of vertical plates (12), the vertical plates (12) are arranged on both sides of the movable contact (2), the connecting plate (11) and the vertical plates (12) are vertically connected, the upper armature (51) is arranged parallel to the connecting plate (11), the upper armature (51) is fixed on the vertical plates (12), and the connecting plate (11), the vertical plates (12) and the upper armature (51) form a rectangular frame structure and are sleeved outside the movable contact (2).
3. The structure for improving the contact stability of the moving and static contacts of a contactor according to claim 2, characterized in that: The movable frame (1) is made of insulating material.
4. The structure for improving the contact stability of the moving and static contacts of a contactor according to claim 2, characterized in that: An overtravel spring (21) is provided between the movable contact (2) and the connecting plate (11). The overtravel spring (21) is perpendicular to the connecting plate (11). One end of the overtravel spring (21) abuts against the connecting plate (11), and the other end abuts against the movable contact (2).
5. The structure for improving the contact stability of the moving and static contacts of a contactor according to claim 4, characterized in that: A plurality of external clamping blocks (24) are provided on the movable contact (2), and the end of the overtravel spring (21) is arranged in a space enclosed by the external clamping blocks (24).
6. The structure for improving the contact stability of the moving and static contacts of a contactor according to claim 5, characterized in that: An inner clamping block (111) is provided on the connecting plate (11), and the inner clamping block (111) is inserted into the end of the overtravel spring (21).
7. The structure for improving the contact stability of the moving and static contacts of a contactor according to claim 6, characterized in that: A positioning seat (23) is provided on the movable contact (2), a through hole is provided on the upper armature (51), and the positioning seat (23) is used to be inserted into the through hole.
8. The structure for improving the contact stability of the moving and static contacts of a contactor according to claim 7, characterized in that: The movable contact (2) is provided with a hook (22), the vertical plate (12) is provided with a slide groove, and the hook (22) extends from the slide groove.