Contactor interlock

Abstract

This invention relates to a contactor self-locking device, comprising a main contact assembly and a push rod assembly disposed inside an arc-extinguishing chamber. The main contact assembly includes a moving spring and at least two stationary contacts. The push rod assembly connects to the moving spring. The contactor self-locking device further includes a fixed clamping plate and a locking mechanism. The fixed clamping plate clamps the moving spring, and its proximal and distal ends extend outward from the moving spring to form grooves. The locking mechanism includes a base disposed inside the arc-extinguishing chamber and a locking member movably disposed near the proximal end of the base. When a large current flows through the main circuit, the locking member moves relative to the base toward the groove, causing a portion of the locking member to engage with the groove, thereby limiting the movement of the moving spring. This invention has a simple structure; as long as the triggering condition is met, the locking mechanism will automatically trigger, ensuring that the moving and stationary contacts are not repelled by electromagnetic force when a large current flows through the main circuit, thus ensuring high reliability.

Description

Technical Field

[0001] This invention relates to the field of contactor technology, and more particularly to a contactor self-locking device. Background Technology

[0002] High-voltage DC contactors are used in power, distribution, and consumption applications. They are electrical devices in industrial electricity that utilize the magnetic field generated by current flowing through a coil to close contacts and control the load. In existing technology, when a large current, such as a short-circuit current, passes through the main circuit of a high-voltage retaining contactor, the only way to prevent the moving and stationary contacts from repelling each other is to increase the pressure between the moving and stationary contacts, or to use a short-circuit ring structure to increase the reverse attractive force on the moving contact to counteract the electromagnetic repulsion. Neither of these solutions can guarantee that the moving and stationary contacts will not be repelled by electromagnetic force when a large current passes through the main circuit.

[0003] Chinese invention patent CN216353986U discloses a lockable electromagnetic relay. Its key technical features include a base, a housing on the base, an electromagnetic assembly inside the housing, a coil frame with an iron core, a yoke on the coil frame, an armature engaged with the yoke, a moving spring with a moving contact on the armature, and a stationary contact on the base with a stationary contact. The housing also includes a locking mechanism, comprising a disc-shaped sliding key slidably connected to the housing and rotating relative to it. A limiting rod is eccentrically positioned at one end of the sliding key to restrict the armature from pressing down or lifting up. Trapezoidal limiting blocks are symmetrically positioned on the upper and lower sides of the armature, fitting snugly against the limiting rod. A through slot matching the limiting rod is also provided on the armature. While this locking mechanism can restrict the movement of the armature, its structure is fragile and easily deformed, failing to guarantee that the moving and stationary contacts will not be repelled by electromagnetic force when a large current flows through the main circuit. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the object of the present invention is to provide a contactor self-locking device to solve one or more problems in the prior art.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows:

[0006] A contactor self-locking device includes a main contact assembly and a push rod assembly disposed inside an arc-extinguishing chamber. The main contact assembly includes a moving spring and at least two stationary contacts. The push rod assembly is connected to the moving spring. The contactor self-locking device also includes a fixed clamping plate and a locking mechanism. The fixed clamping plate clamps the moving spring, and the proximal and distal ends of the fixed clamping plate extend out of the moving spring to form grooves. The locking mechanism includes a base disposed inside the arc-extinguishing chamber and a locking member movably disposed near the proximal end of the base. When a large current passes through the main circuit, the locking member moves relative to the base toward the groove, causing a portion of the locking member to engage with the groove, thereby limiting the movement of the moving spring.

[0007] Furthermore, the fixing clamp is a U-shaped plate.

[0008] Furthermore, the fixing clamp includes at least one first clamp and a second clamp connected to the distal end of the first clamp.

[0009] Furthermore, the fixing plate includes two first clamps and a second clamp connected to the distal end of the first clamps, and the grooves formed by the first clamps and the second clamps are respectively located on both sides of the moving spring.

[0010] Furthermore, when a large current passes through the main circuit, the locking member rotates relative to the base toward the groove, causing a portion of the locking member to engage with the groove, thereby limiting the movement of the spring.

[0011] Furthermore, a pin seat is provided at the proximal end of the base, and the distal end of the locking member is rotatably connected to the pin seat via a shaft. The proximal end of the locking member has a second protrusion.

[0012] Furthermore, a stop is provided at the far end of the locking component, and a permanent magnet is provided at the near end of the base. When the main circuit is working normally, the permanent magnet attracts the stop.

[0013] Furthermore, a support is provided near the base, a bracket is provided on the support, the locking member is mounted on the bracket, and the surface of the locking member near the groove has a third protrusion and a fourth protrusion.

[0014] Furthermore, a swing arm is provided at the distal end of the locking member, and a third hole is opened on the support to cooperate with the swing arm. When a large current passes through the main circuit, the swing arm passes through the third hole.

[0015] Furthermore, the locking mechanism also includes a fourth elastic element, the proximal end of which is connected to the locking element, and the distal end of which is connected to the support. The fourth elastic element is used to reset the locking element.

[0016] Furthermore, when a large current flows through the main circuit, the locking member translates relative to the base toward the groove, causing a portion of the locking member to engage with the groove, thereby limiting the movement of the spring.

[0017] Furthermore, a fifth hole is provided near the base, and the locking member includes a sleeve disposed in the fifth hole. A piston is slidably disposed in the sleeve. When a large current passes through the main circuit, the piston extends out of the sleeve and engages with the groove.

[0018] Furthermore, a third elastic element is provided inside the sleeve, one end of the third elastic element is connected to the sleeve, and the other end of the third elastic element is connected to the piston. The third elastic element is used to realize the piston reset.

[0019] Furthermore, a vertical plate is provided near the base, a fourth groove is opened near the vertical plate, a limiting strip is provided on the opposite side of the fourth groove, the locking member includes a main body and bent portions provided on both sides of the main body, the bent portions are opened with a fifth groove for the limiting strip to be inserted, and the main body has a fifth protrusion on the side near the groove.

[0020] Furthermore, the locking mechanism also includes at least two fifth elastic elements, one end of which is connected to the proximal end of the vertical plate, and the other end of which is connected to the bending portion. The fifth elastic elements are used to reset the locking element. A baffle is also provided at the proximal end of the vertical plate to abut against the main body when resetting.

[0021] Furthermore, the push rod assembly includes an insulating seat and a push rod connected to the insulating seat, with the proximal end of the insulating seat connected to the movable spring via a bracket.

[0022] Furthermore, a first opening is provided at the proximal end of the bracket for the fixed clamp to move, and second openings are provided on both sides of the bracket for the moving spring to pass through.

[0023] Furthermore, the push rod assembly also includes a first elastic element, one end of which is connected to the far end of the fixed clamping plate, and the other end of which is connected to the near end of the insulating seat. The first elastic element is used to abut against the fixed clamping plate.

[0024] Furthermore, the arc-extinguishing chamber is a sealed space consisting of a ceramic body and a yoke plate, with the distal end of the stationary contact passing through the ceramic body.

[0025] Furthermore, the yoke plate has a first hole through which the push rod assembly passes.

[0026] Accordingly, the present invention also provides a contactor, including the contactor self-locking device described above, and a drive assembly for driving the push rod assembly to move.

[0027] Furthermore, the drive assembly includes a moving iron core, which is threadedly connected to the distal end of the push rod.

[0028] Furthermore, the drive assembly also includes a second elastic element, one end of which is connected to the far end of the yoke plate, and the other end of which is connected to the moving iron core. The second elastic element is used to reset the moving iron core.

[0029] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0030] (i) The contactor self-locking device of the present invention, when a large current passes through the main circuit, the locking member moves relative to the base toward the groove, so that a part of the locking member is locked into the groove, thereby limiting the moving spring. The structure is simple. As long as the triggering condition is met, the locking mechanism will be automatically triggered, which can ensure that the moving and stationary contacts are not repelled by electromagnetic force when a large current passes through the main circuit, and has high reliability.

[0031] (ii) Furthermore, when the main circuit current is normal, the permanent magnet at the near end of the base attracts the stop block to reset the locking component, or the fourth elastic element is used to reset the locking component, or the third elastic element is used to reset the piston, so as to avoid the locking component being locked by mistake and to achieve high stability in use. Attached Figure Description

[0032] Figure 1 An isometric view of the contactor self-locking device provided in Embodiment 1 of the present invention is shown.

[0033] Figure 2 A front view structural schematic diagram of the contactor self-locking device provided in Embodiment 1 of the present invention is shown.

[0034] Figure 3 A cross-sectional view of the contactor self-locking device provided in Embodiment 1 of the present invention is shown at point AA.

[0035] Figure 4 A schematic diagram of the push rod assembly in the contactor self-locking device provided in Embodiment 1 of the present invention is shown.

[0036] Figure 5 A schematic diagram of the contactor self-locking device provided in Embodiment 2 of the present invention is shown.

[0037] Figure 6 A schematic diagram of the locking mechanism in the contactor self-locking device provided in Embodiment 1 of the present invention is shown.

[0038] Figure 7 An isometric view of the contactor self-locking device provided in Embodiment 3 of the present invention is shown.

[0039] Figure 8A front view structural schematic diagram of the contactor self-locking device provided in Embodiment 3 of the present invention is shown.

[0040] Figure 9 A cross-sectional view of the contactor self-locking device provided in Embodiment 3 of the present invention is shown at BB.

[0041] Figure 10 A schematic diagram of the contactor self-locking device provided in Embodiment 4 of the present invention is shown.

[0042] Figure 11 A schematic diagram of the locking mechanism in the contactor self-locking device provided in Embodiment 3 of the present invention is shown.

[0043] Figure 12 An isometric view of the contactor self-locking device provided in Embodiment 5 of the present invention is shown.

[0044] Figure 13 A front view structural schematic diagram of the contactor self-locking device provided in Embodiment 5 of the present invention is shown.

[0045] Figure 14 A cross-sectional view of the contactor self-locking device provided in Embodiment 5 of the present invention is shown at CC.

[0046] Figure 15 A schematic diagram of the contactor self-locking device provided in Embodiment Six of the present invention is shown.

[0047] Figure 16 A schematic diagram of the locking mechanism in the contactor self-locking device provided in Embodiment 5 of the present invention is shown.

[0048] Figure 17 The diagram shows the structure of the fixing plate in the contactor self-locking device provided in embodiments one, three, and five of the present invention.

[0049] Figure 18 The diagram shows the structure of the fixing clamp in the contactor self-locking device provided in embodiments two, four, and six of the present invention.

[0050] Figure 19 The following are isometric views of the contactor self-locking device provided in Embodiments 7 and 8 of the present invention.

[0051] Figure 20 The diagram shows a front view of the contactor self-locking device provided in Embodiments 7 and 8 of the present invention.

[0052] Figure 21 A cross-sectional view of the contactor self-locking device provided in Embodiments 7 and 8 of the present invention is shown at DD.

[0053] Figure 22The diagram shows the structure of the contactor self-locking device provided in Embodiments 7 and 8 of the present invention.

[0054] Marked in the attached diagram:

[0055] 1. Main contact assembly; 11. Stationary contact; 12. Moving spring; 121. First extension; 122. Sixth hole; 2. Push rod assembly; 21. Push rod; 22. Insulating base; 221. First protrusion; 222. First slot; 23. Bracket; 231. First opening; 232. Second opening; 24. First elastic element; 3. Yoke plate; 31. First hole; 4. Connecting block; 41. Second hole; 42. Second extension; 43. Second slot; 5. Drive assembly; 51. Moving iron core; 511. Third slot; 52. Second elastic element; 6. Fixing clamp; 61. First clamp; 62. Second clamp; 63. Groove; 64. Connecting rod; 7. Base; 710. 720. Pin seat; 721. Support; 722. Bracket; 723. Third hole; 724. First hook; 730. Fifth hole; 740. Vertical plate; 7401. Fourth groove; 7402. Limiting strip; 741. Baffle; 8. Locking element; 810. Shaft; 811. Stop block; 812. Second protrusion; 8210. Rocker arm; 8211. Second hook; 8212. Third protrusion; 8213. Fourth protrusion; 822. Fourth elastic element; 83. Sleeve; 831. Piston; 832. Third elastic element; 833. Cylinder cover; 840. Main body; 8401. Fifth protrusion; 841. Bending part; 8410. Fifth groove; 842. Fifth elastic element. Detailed Implementation

[0056] To make the objectives, features, and advantages of this invention more apparent and understandable, please refer to the accompanying drawings. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are merely for illustrative purposes and to aid those skilled in the art in understanding and reading the invention. They are not intended to limit the implementation conditions of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed in this invention.

[0057] In the description of this invention, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0058] To more clearly describe the structure of the aforementioned anti-contactor self-locking device, this invention defines the terms "distal end" and "proximal end" to... Figure 2 For example, Figure 2 The upper end of the middle static contact 11 is the proximal end. Figure 2 The lower end of the middle static contact 11 is the distal end.

[0059] Example 1

[0060] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 6 The contactor self-locking device includes a main contact assembly 1 and a push rod assembly 2 disposed inside the arc-extinguishing chamber. The main contact assembly 1 includes a movable spring 12 and at least two stationary contacts 11. The push rod assembly 2 is connected to the movable spring 12. The contactor self-locking device also includes a fixed clamping plate 6 and a locking mechanism. The fixed clamping plate 6 clamps the movable spring 12, and the proximal and distal ends of the fixed clamping plate 6 extend out of the movable spring 12 to form a groove 63. The locking mechanism includes a base 7 disposed inside the arc-extinguishing chamber and a locking member 8 movably disposed near the proximal end of the base 7. When a large current passes through the main circuit, the locking member 8 moves relative to the base 7 toward the groove 63, so that a part of the locking member 8 is engaged in the groove 63 to limit the movable spring 12.

[0061] Specifically, in the contactor self-locking device described in Embodiment 1, when a large current flows through the main circuit, for example, a current threshold of 8kA, when the current exceeds 8kA, the electromagnetic attraction force is greater than the attraction force of the permanent magnet on the locking member. The locking member 8 rotates relative to the base 7 toward the groove 63, causing a portion of the locking member 8 to engage with the groove 63, thereby limiting the movement of the spring 12. When the current does not exceed the threshold, the self-locking device does not operate.

[0062] In the contactor self-locking device described in this embodiment, the locking member 8 is made of a metal material that can be attracted by electromagnetic force.

[0063] The specific structure of the locking mechanism is described below:

[0064] Please refer to Figure 3 and Figure 6 Furthermore, a pin seat 710 is provided near the base 7, and a shaft portion 810 is provided between the pin seats 710. The distal end of the locking member 8 is bent to form a pin hole (not shown in the figure), and the shaft portion 810 passes through the pin hole and is rotatably connected to the pin seat 710. The locking member 8 has a second protrusion 812 near its protrusion, which faces the groove 63. When a large current passes through the main circuit, the electromagnetic force generated by the fixing plate 6 is greater than the magnetic force of the permanent magnet. The locking member 8 rotates relative to the base 7 toward the groove 63, so that the second protrusion 812 of the locking member 8 is engaged in the groove 63 to limit the movement of the spring 12.

[0065] Please refer to Figure 3 and Figure 6 Furthermore, a stop block 811 is provided at the far end of the locking member 8, and a permanent magnet (not marked in the figure) is provided at the near end of the base 7 corresponding to the far end of the stop block. When the main circuit is working normally, the permanent magnet attracts the stop block.

[0066] Please refer to Figure 1 , Figure 2 and Figure 17 Furthermore, the fixing plate 6 is a U-shaped plate, and the groove 63 of the U-shaped plate is fixedly connected by a connecting rod 64. A locking mechanism is set on the yoke plate 3 on one side of the corresponding groove 63.

[0067] The specific structure of the push rod assembly 2 and the arc-extinguishing chamber is described below:

[0068] Please refer to Figure 4 Furthermore, the push rod assembly 2 includes an insulating base 22 and a push rod 21 connected to the insulating base 22. The proximal end of the insulating base 22 is connected to the movable spring 12 via a bracket 23. Please refer to [reference needed]. Figure 3 The insulating seat 22 has a first slot 222 at its near end, and a first protrusion 221 is provided in the first slot 222. The near end of the push rod is engaged in the first protrusion 221.

[0069] Please refer to Figure 4 Furthermore, the bracket 23 has a first opening 231 at its proximal end for the fixed clamping plate 6 to move, and second openings 232 on both sides of the bracket 23 for the first extensions 121 at both ends of the movable spring 12 to pass through.

[0070] Please refer to Figure 3 and Figure 4Furthermore, the push rod assembly 2 also includes a first elastic element 24, one end of which is connected to the far end of the fixed clamping plate 6, and the other end of which is connected to the first slot 222 of the insulating seat 22. The first elastic element 24 is used to abut against the fixed clamping plate 6.

[0071] Please refer to Figure 1 and Figure 2 Furthermore, the arc-extinguishing chamber is a sealed space consisting of a ceramic body (not shown in the figure) and a yoke plate 3, and the distal end of the stationary contact 11 passes through the ceramic body.

[0072] Please refer to Figure 3 Furthermore, the yoke plate 3 has a first hole 31 through which the push rod assembly 2 passes.

[0073] Please refer to Figure 1 , Figure 2 and Figure 3 Accordingly, the present invention also provides a contactor, including the contactor self-locking device described above, and a drive assembly 5 for driving the push rod assembly 2 to move.

[0074] Please refer to Figure 3 Furthermore, the drive assembly 5 includes a moving iron core 51, which is threadedly connected to the distal end of the push rod 21, and a third slot 511 is formed at the proximal end of the moving iron core 51.

[0075] Please refer to Figure 3 Furthermore, the drive assembly 5 also includes a connecting block 4, which has a second hole 41 through which the push rod 21 passes, a second extension 42 at the proximal end of the connecting block 4 that engages with the first hole 31, and a second slot 43 at the distal end of the connecting block 4.

[0076] Please refer to Figure 3 Furthermore, the drive assembly 5 also includes a second elastic element 52, one end of which is connected to the second slot 43 of the connecting block 4, and the other end of which is connected to the third slot 511 of the moving iron core 51. The second elastic element 52 is used to reset the moving iron core 51.

[0077] The specific workflow of this invention is as follows:

[0078] The two stationary contacts 11 and the moving spring 12 form the main circuit. When a large current passes through the main circuit, the U-shaped structure of the fixed clamp 6 generates an electromagnetic attraction force greater than the magnetic force of the permanent magnet, attracting the locking member 8 to rotate relative to the base 7 toward the groove 63, so that the second protrusion 812 of the locking member 8 is inserted into the groove 63 to limit the moving spring 12.

[0079] Example 2

[0080] Please refer to Figure 5 and Figure 18 The structure and workflow of Embodiment 2 are largely the same as those of Embodiment 1. The difference is that the fixing clamp 6 includes two first clamps 61 and a second clamp 62 connected to the distal end of the first clamps 61. The second clamp 62 is an L-shaped clamp, and the two second clamps 62 are arranged opposite to each other. The proximal ends of the second clamps 62 pass through the sixth hole 122 opened on the movable spring 12 and engage with the first clamps 61. The grooves 63 formed by the first clamps 61 and the second clamps 62 are located on both sides of the movable spring 12, and two locking mechanisms are respectively arranged on the yoke plate 3 on one side of the corresponding groove 63.

[0081] Example 3

[0082] Please refer to Figure 7 , Figure 8 , Figure 9 and Figure 11 The structure and workflow of Embodiment 3 are mostly the same as those of Embodiment 1. The difference is that a support 720 is provided near the base 7, and a bracket 721 is provided on the support 720. The locking member 8 is mounted on the bracket 721. A third protrusion 8212 and a fourth protrusion 8213 are provided on the surface of the locking member 8 near the groove 63. When a large current passes through the main circuit, the locking member 8 rotates to make the third protrusion 8212 engage with the groove 63.

[0083] Please refer to Figure 7 , Figure 8 , Figure 9 and Figure 11 Furthermore, a swing arm 8210 is provided at the distal end of the locking member 8, and a third hole 722 is provided on the support 720 to cooperate with the swing arm 8210. When a large current passes through the main circuit, the locking member 8 rotates, and at the same time the swing arm 8210 passes through the third hole 722 to prevent the locking member 8 from swaying left and right.

[0084] Please refer to Figure 9 and Figure 11 Furthermore, the support 720 has a first hook 723 on its back, the locking member 8 has a second hook 8211 on its back, and the locking mechanism also includes a fourth elastic member 822. The proximal end of the fourth elastic member 822 is connected to the second hook 8211 of the locking member 8, and the distal end of the fourth elastic member 822 is connected to the first hook 723 of the support 720. The fourth elastic member 822 is used to reset the locking member 8.

[0085] The two stationary contacts 11 and the moving spring 12 form the main circuit. When a large current passes through the main circuit, the U-shaped structure of the fixed clamp 6 generates an electromagnetic attraction force that is greater than the elastic force of the fourth elastic element 822, attracting the locking element 8 to rotate relative to the base 7 toward the groove 63, so that the third protrusion 8212 of the locking element 8 is inserted into the groove 63, thereby limiting the moving spring 12.

[0086] Example 4

[0087] Please refer to Figure 10 and Figure 18 The structure and workflow of Embodiment 4 are largely the same as those of Embodiment 3. The difference is that the fixing clamp 6 includes two first clamps 61 and a second clamp 62 connected to the distal end of the first clamps 61. The second clamp 62 is an L-shaped clamp. The two second clamps 62 are arranged opposite to each other, and the proximal ends of the second clamps 62 pass through the sixth hole 122 opened on the movable spring 12 and engage with the first clamps 61. The grooves 63 formed by the first clamps 61 and the second clamps 62 are located on both sides of the movable spring 12, and two locking mechanisms are respectively set on the yoke plate 3 on one side of the corresponding groove 63.

[0088] Example 5

[0089] Example 5 is largely the same as Example 1 in terms of structure and operation. The difference is that when a large current passes through the main circuit, the locking member 8 moves relative to the base 7 toward the groove 63, so that a part of the locking member 8 is engaged in the groove 63 to limit the movement of the spring 12.

[0090] Please refer to Figure 12 , Figure 13 , Figure 14 and Figure 16 Furthermore, a fifth hole 730 is provided near the base 7, and the locking member 8 includes a sleeve 83 disposed in the fifth hole 730. A piston 831 is slidably disposed in the sleeve 83. When a large current passes through the main circuit, the piston 831 extends out of the sleeve 83 and engages with the groove 63.

[0091] Please refer to Figure 14 and Figure 16 Furthermore, a sleeve cover 833 is provided at the groove 63 of the sleeve 83, and one end of the piston 831 has a step (not marked in the figure). When the piston 831 extends out of the sleeve cover 833, the step abuts against the sleeve cover 833 to prevent the piston 831 from flying out.

[0092] Please refer to Figure 14 and Figure 16Furthermore, a third elastic element 832 is provided inside the sleeve 83. One end of the third elastic element 832 is connected to the sleeve 83, and the other end of the third elastic element 832 is connected to the piston 831. The third elastic element 832 is used to realize the reset of the piston 831.

[0093] The two stationary contacts 11 and the moving spring 12 form the main circuit. When a large current passes through the main circuit, the U-shaped structure of the fixed clamp 6 generates an electromagnetic attraction force that is greater than the elastic force of the third elastic element 832. This attracts the piston 831 in the sleeve 83 to move horizontally along the inner wall of the sleeve 83 toward the groove 63, so that the front end of the piston 831 is engaged in the groove 63, thereby limiting the moving spring 12.

[0094] Example 6

[0095] Please refer to Figure 15 and Figure 18 The structure and workflow of Embodiment Six are largely the same as those of Embodiment Five. The difference is that the fixing clamp 6 includes two first clamps 61 and a second clamp 62 connected to the distal end of the first clamps 61. The second clamps 62 are L-shaped clamps. The two second clamps 62 are arranged opposite to each other, and the proximal ends of the second clamps 62 pass through the sixth hole 122 opened on the movable spring 12 and engage with the first clamps 61. The grooves 63 formed by the first clamps 61 and the second clamps 62 are located on both sides of the movable spring 12, and two locking mechanisms are respectively set on the yoke plates 3 on one side of the corresponding grooves 63.

[0096] Example 7

[0097] Please refer to Figure 19 , Figure 20 , Figure 21 and Figure 22 The structure and workflow of Embodiment 7 are mostly the same as those of Embodiment 5. The difference is that a vertical plate 740 is provided near the base 7, and a fourth slot 7401 is opened near the vertical plate 740. A limiting strip 7402 is provided on the opposite side of the fourth slot 7401. The locking member 8 includes a main body 840 and bent portions 841 provided on both sides of the main body 840. The bent portions 841 have a fifth slot 8410 for the limiting strip 7402 to be inserted. The locking member 8 can move horizontally relative to the vertical plate 740 along the direction of the fifth slot 8410 until the limiting strip 7402 abuts against the bent portion 841. The main body 840 has a fifth protrusion 8401 on the side near the groove 63 for locking the groove 63.

[0098] Please refer to Figure 21 and Figure 22Furthermore, the locking mechanism also includes two fifth elastic elements 842. One end of each fifth elastic element 842 is connected to both sides of the fourth slot 7401 of the vertical plate 740, and the other end is connected to the bending portion 841. The fifth elastic elements 842 are used to reset the locking member 8. A baffle 741 is also provided near the end of the vertical plate 740. When the electromagnetic attraction force is less than the elastic force of the fifth elastic element 842, the elastic force of the fifth elastic element 842 pushes the locking member 8 to move away from the groove 63 until the main body 840 abuts against the baffle 741.

[0099] The two stationary contacts 11 and the moving spring 12 form the main circuit. When a large current passes through the main circuit, the U-shaped structure of the fixed clamp 6 generates an electromagnetic attraction force that is greater than the elastic force of the fifth elastic member 842, attracting the locking member 8 to move horizontally along the direction of the fifth slot 8410, so that the fifth protrusion 8401 is inserted into the groove 63 to limit the moving spring 12.

[0100] Example 8

[0101] Please refer to Figure 18 and Figure 21 The structure and workflow of Embodiment 8 are largely the same as those of Embodiment 5. The difference is that the fixing clamp 6 includes two first clamps 61 and a second clamp 62 connected to the distal end of the first clamps 61. The second clamps 62 are L-shaped clamps. The two second clamps 62 are arranged opposite to each other, and the proximal ends of the second clamps 62 pass through the sixth hole 122 opened on the movable spring 12 and engage with the first clamps 61. The grooves 63 formed by the first clamps 61 and the second clamps 62 are located on both sides of the movable spring 12, and two locking mechanisms are respectively arranged on the yoke plate 3 on one side of the corresponding groove 63.

[0102] In summary, any locking mechanism that utilizes one or two U-shaped fixed clamping plates 6 to drive the locking member to displace and engage with the groove 63 when a large current passes through the main circuit falls within the protection scope of this patent.

[0103] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A contactor interlock device, characterized by: The device includes a main contact assembly and a push rod assembly disposed inside the arc-extinguishing chamber. The main contact assembly includes a movable spring and at least two stationary contacts. The push rod assembly is connected to the movable spring. The contactor self-locking device also includes a fixed clamping plate and a locking mechanism. The fixed clamping plate clamps the movable spring, and the proximal and distal ends of the fixed clamping plate extend out of the movable spring to form a groove. The locking mechanism includes a base disposed inside the arc-extinguishing chamber and a locking member movably disposed near the proximal end of the base. When a large current passes through the main circuit, the locking member moves relative to the base toward the groove, so that a portion of the locking member is engaged in the groove to limit the movable spring. The fixing clamp is a U-shaped plate; When a large current passes through the main circuit, the locking member rotates relative to the base toward the groove, causing a portion of the locking member to engage with the groove, thereby limiting the movement of the spring. and The locking component has a stop at its far end and a permanent magnet at its near end. When the main circuit is working normally, the permanent magnet attracts the stop.

2. The contactor self-locking device as described in claim 1, characterized in that: The fixing clamp includes at least one first clamp and a second clamp connected to the distal end of the first clamp.

3. The contactor self-locking device as described in claim 2, characterized in that: The fixed clamping plate includes two first clamping plates and a second clamping plate connected to the distal end of the first clamping plates. The grooves formed by the first clamping plates and the second clamping plates are located on both sides of the movable spring.

4. The contactor self-locking device as described in claim 1, characterized in that: A pin seat is provided at the near end of the base, and the far end of the locking member is rotatably connected to the pin seat via a shaft.

5. The contactor self-locking device as described in claim 1, characterized in that: The locking member has a second protrusion at its proximal end.

6. The contactor self-locking device as described in claim 1, characterized in that: A support is provided near the base, and a bracket is provided on the support. The locking member is mounted on the bracket, and the surface of the locking member near the groove has a third protrusion and a fourth protrusion.

7. The contactor self-locking device as described in claim 6, characterized in that: A swing arm is provided at the distal end of the locking component, and a third hole is opened on the support to cooperate with the swing arm. When a large current passes through the main circuit, the swing arm passes through the third hole.

8. The contactor self-locking device as described in claim 7, characterized in that: The locking mechanism further includes a fourth elastic element, the proximal end of which is connected to the locking element, and the distal end of which is connected to the support. The fourth elastic element is used to reset the locking element.

9. The contactor self-locking device as described in claim 1, characterized in that: The push rod assembly includes an insulating base and a push rod connected to the insulating base, with the proximal end of the insulating base connected to the movable spring via a bracket.

10. The contactor self-locking device as described in claim 9, characterized in that: The bracket has a first opening at its proximal end for the fixed clamp to move, and second openings on both sides of the bracket for the moving spring to pass through.

11. The contactor self-locking device as described in claim 9, characterized in that: The push rod assembly further includes a first elastic element, one end of which is connected to the far end of the fixed clamping plate, and the other end of which is connected to the near end of the insulating seat. The first elastic element is used to abut against the fixed clamping plate.

12. The contactor self-locking device as described in claim 1, characterized in that: The arc-extinguishing chamber is a sealed space consisting of a ceramic body and a yoke plate, with the distal end of the stationary contact passing through the ceramic body.

13. The contactor self-locking device as described in claim 12, characterized in that: The yoke plate has a first hole through which the push rod assembly passes.

14. A contactor self-locking device, characterized in that: The device includes a main contact assembly and a push rod assembly disposed inside the arc-extinguishing chamber. The main contact assembly includes a movable spring and at least two stationary contacts. The push rod assembly is connected to the movable spring. The contactor self-locking device also includes a fixed clamping plate and a locking mechanism. The fixed clamping plate clamps the movable spring, and the proximal and distal ends of the fixed clamping plate extend out of the movable spring to form a groove. The locking mechanism includes a base disposed inside the arc-extinguishing chamber and a locking member movably disposed near the proximal end of the base. When a large current passes through the main circuit, the locking member moves relative to the base toward the groove, so that a portion of the locking member is engaged in the groove to limit the movable spring. The fixing clamp is a U-shaped plate; The fixing clamp includes at least one first clamp and a second clamp connected to the distal end of the first clamp; When a large current passes through the main circuit, the locking member translates relative to the base toward the groove, causing a portion of the locking member to engage with the groove, thereby limiting the movement of the spring. The base has a fifth hole at its near end, and the locking member includes a sleeve disposed in the fifth hole. A piston is slidably disposed in the sleeve. When a large current passes through the main circuit, the piston extends out of the sleeve and engages with the groove. and The sleeve contains a third elastic element, one end of which is connected to the sleeve and the other end of which is connected to the piston. The third elastic element is used to reset the piston.

15. The contactor self-locking device as described in claim 14, characterized in that: A vertical plate is provided near the base, and a fourth groove is opened near the vertical plate. A limiting strip is provided on the opposite side of the fourth groove. The locking member includes a main body and bent portions provided on both sides of the main body. The bent portions have a fifth groove for the limiting strip to be inserted. The main body has a fifth protrusion on the side near the groove.

16. The contactor self-locking device as described in claim 15, characterized in that: The locking mechanism further includes at least two fifth elastic elements. One end of the fifth elastic element is connected to the proximal end of the vertical plate, and the other end of the fifth elastic element is connected to the bending portion. The fifth elastic element is used to reset the locking element. A baffle is also provided at the proximal end of the vertical plate to abut against the main body when resetting.

17. The contactor self-locking device as described in claim 14, characterized in that: The push rod assembly includes an insulating base and a push rod connected to the insulating base, with the proximal end of the insulating base connected to the movable spring via a bracket.

18. The contactor self-locking device as described in claim 17, characterized in that: The bracket has a first opening at its proximal end for the fixed clamp to move, and second openings on both sides of the bracket for the moving spring to pass through.

19. The contactor self-locking device as described in claim 17, characterized in that: The push rod assembly further includes a first elastic element, one end of which is connected to the far end of the fixed clamping plate, and the other end of which is connected to the near end of the insulating seat. The first elastic element is used to abut against the fixed clamping plate.

20. The contactor self-locking device as described in claim 14, characterized in that: The arc-extinguishing chamber is a sealed space consisting of a ceramic body and a yoke plate, with the distal end of the stationary contact passing through the ceramic body.

21. The contactor self-locking device as described in claim 20, characterized in that: The yoke plate has a first hole through which the push rod assembly passes.

22. A contactor, characterized in that: It includes the contactor self-locking device according to any one of claims 1 to 21, and a drive assembly for driving the push rod assembly to move.

23. The contactor as claimed in claim 22, characterized in that: The drive assembly includes a moving iron core, which is threadedly connected to the distal end of the push rod of the push rod assembly.

24. The contactor as claimed in claim 23, characterized in that: The drive assembly further includes a second elastic element, one end of which is connected to the far end of the yoke plate, and the other end of which is connected to the moving iron core. The second elastic element is used to reset the moving iron core.

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