Repulsion locking device of vacuum circuit breaker and vacuum circuit breaker

Abstract

The utility model provides a vacuum circuit breaker and a repulsion locking device thereof, the repulsion locking device comprises a vacuum arc-extinguishing chamber, a locking mechanism, a moving contact and a static contact, the moving contact and the static contact are opposite to each other, and at least the contact part of the moving contact and the static contact is located in the vacuum arc-extinguishing chamber. The locking mechanism comprises a first locking piece and a second locking piece which are matched for locking, the first locking piece is connected with the moving contact, the second locking piece is fixedly arranged, the first locking piece comprises a first locking part, the second locking piece comprises a second locking part, and when the moving contact is located at a first position where the moving contact is in contact with the static contact, the first locking part and the second locking part are staggered; and after the moving contact is repelled by the electric repulsive force, when the moving contact moves from the first position to the second position, the second locking piece locks the first locking piece to prevent the moving contact from resetting. According to the utility model, the service lives of the moving contact and the static contact can be prolonged, and the normal use of the vacuum circuit breaker is ensured.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a repulsion locking device for a vacuum circuit breaker and a vacuum circuit breaker. Background Technology

[0002] Vacuum circuit breakers are widely used in power systems. They are connected in circuits to protect and disconnect circuits, ensuring the normal, safe and stable operation of the power system.

[0003] In existing technology, when a short circuit occurs inside a vacuum circuit breaker, the electro-repulsive force (Holm force) generated between the stationary and moving contacts repels the moving contact apart. However, because a contact spring is installed inside the vacuum circuit breaker, the moving and stationary contacts close again under the action of the contact spring. After closing again, an electro-repulsive force is generated between the moving and stationary contacts again, and the moving and stationary contacts separate again. In this repeated process, the moving and stationary contacts are continuously arced. This situation causes very serious burn-out of the moving and stationary contacts, and may even lead to the stationary contact being welded, which seriously affects the normal use of the vacuum circuit breaker and the service life of the moving and stationary contacts. Utility Model Content

[0004] The purpose of this utility model is to overcome the defects of the prior art and provide a vacuum circuit breaker repulsion locking device and a vacuum circuit breaker that can achieve position locking after the moving contact and stationary contact are repelled.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] In a first aspect, this application provides a repulsion locking device for a vacuum circuit breaker, including a vacuum interrupter, a locking mechanism, and opposing moving and stationary contacts. At least the contact portions of the moving and stationary contacts are located inside the vacuum interrupter. The moving contact is connected to the locking mechanism, which includes a first locking member and a second locking member that cooperate for locking. The first locking member is connected to the moving contact, and the second locking member is fixedly disposed. The first locking member includes a first locking portion, and the second locking member includes a second locking portion. When the moving contact is in a first position in contact with the stationary contact, the first locking portion and the second locking portion are misaligned. After the moving contact is repelled by an electric repulsion force, when the moving contact moves from the first position to the second position, the second locking member locks the first locking member to prevent the moving contact from resetting.

[0007] In one possible implementation, the repulsion locking device further includes an auxiliary repulsion mechanism, which includes a moving connecting plate and a stationary connecting plate spaced apart from each other. The moving connecting plate and the stationary connecting plate are electrically connected by a flexible conductor, and the moving connecting plate is connected to a moving contact. When the electric repulsion force causes the moving connecting plate to move relative to the stationary connecting plate, the moving connecting plate drives the moving contact and the stationary contact to separate. The locking mechanism locks the moving connecting plate to keep the moving contact and the stationary contact in a separated state.

[0008] In one possible implementation, the moving connection plate is located on the side of the stationary connection plate away from the moving contact. The stationary connection plate includes a third through hole through which a moving contact support connected to the moving contact passes and is connected to the moving connection plate. The moving connection plate includes a first connecting end, and the stationary connection plate includes a second connecting end opposite to the first connecting end. The first connecting end and the second connecting end are electrically connected through the flexible conductor. The end of the stationary connection plate away from the second connecting end is integrally formed with and bent into a lower lead wire, which extends in a direction away from the moving contact.

[0009] In one possible implementation, the flexible conductor causes the moving connecting plate and the stationary connecting plate to be spaced apart.

[0010] In one possible implementation, a linkage mechanism is further included. This linkage mechanism comprises a first linkage member, an unlocking linkage part, and at least one rotatably disposed contact bracket. An operating mechanism is connected to the contact bracket, which in turn connects the first linkage member and the unlocking linkage part. The first linkage member is connected to the moving contact, and the unlocking linkage part cooperates with a second locking member.

[0011] When the operating mechanism drives the contact support to rotate, the contact support drives the moving contact to move through the first linkage to achieve opening and closing of the circuit breaker;

[0012] When the operating mechanism is disengaged, the contact bracket is driven to rotate, causing the unlocking linkage to drive the second locking member to release the lock on the first locking member.

[0013] In one possible implementation, the operating mechanism drives the moving contact to a first position that contacts the stationary contact, or a second position that opens or trips, via a first linkage member. During normal opening operation and overload tripping, as the moving contact moves to the second position, the unlocking linkage also rotates to a position that drives the second locking member to be spaced apart from the first locking member, and the first and second locking members are in an unlocked state.

[0014] In one possible implementation, the unlocking linkage and at least one of the contact supports are integrally formed.

[0015] In one possible implementation, the first locking member includes a limiting plate, the limiting plate including a first locking part, the first locking part being a limiting hole; the second locking member includes a mounting member, a swing hook rotatably mounted on the mounting member, and an elastic member connecting the swing hook and the mounting member; two support arms extend from one side of the mounting member; the swing hook is located between the two support arms; a horizontal axis is provided between the two support arms; the swing hook and the elastic member are mounted on the horizontal axis; the swing hook includes a first swing arm and a second swing arm connected together; the first swing arm includes the first locking part; the second locking part is a hook; and the second swing arm cooperates with the mounting member.

[0016] In one possible implementation, the repulsion locking device further includes an insulating support and a moving contact support. The insulating support is located between the vacuum interrupter and the locking mechanism. One end of the moving contact support is connected to the moving contact, and the other end passes through the insulating support and is connected to the locking mechanism.

[0017] In one possible implementation, the insulating support includes a first through hole, the moving contact support extends at least partially out of the vacuum interrupter to form a moving contact support mounting portion, the moving contact support mounting portion is slidably mounted in the first through hole, and the moving contact support mounting portion passes through the first through hole and is electrically connected to a first locking member.

[0018] In one possible implementation, at least one strip groove is formed on the side wall of the moving contact support along the sliding direction of the moving contact support, and at least one strip protrusion is provided on the inner wall of the first through hole, with the at least one strip groove and the at least one strip protrusion providing a limiting fit; or, at least one strip groove is provided on the inner wall of the first through hole, and at least one strip protrusion is provided on the side wall of the moving contact support along the sliding direction of the moving contact support, with the at least one strip groove and the at least one strip protrusion providing a limiting fit.

[0019] In one possible implementation, the repulsion locking device further includes an insulating bracket and a moving contact support. The insulating bracket is located between the vacuum interrupter and the auxiliary repulsion mechanism. One end of the moving contact support is connected to the moving contact, and the other end passes through the insulating bracket and is connected to the auxiliary repulsion mechanism. The insulating bracket includes a first through hole. The moving contact support extends at least partially out of the vacuum interrupter to form a moving contact support mounting portion. The moving contact support mounting portion is slidably installed in the first through hole. The stationary connecting plate includes a third through hole. The stationary connecting plate is fixedly installed with the insulating bracket. The moving contact support mounting portion passes through the first through hole and the third through hole and is electrically connected to the moving connecting plate. The side of the insulating bracket facing the stationary connecting plate includes a boss. The first through hole passes through the boss to form an annular protrusion. The annular protrusion is installed in the third through hole, and the annular protrusion extends at least partially out of the third through hole.

[0020] In one possible implementation, an upper lead is also included, wherein the stationary contact portion extends out of the vacuum interrupter to form a stationary contact mounting portion, the upper lead is connected to the stationary contact mounting portion, and the upper lead extends in a direction away from the stationary contact.

[0021] In one possible implementation, a contact spring is also included, which drives the moving contact toward the stationary contact, causing the moving contact and the stationary contact to make contact.

[0022] Secondly, this application also provides a vacuum circuit breaker, including the aforementioned repulsion locking device.

[0023] Compared to existing technologies, the present invention provides a vacuum circuit breaker repulsion locking device, comprising a vacuum interrupter chamber and a locking mechanism. The vacuum interrupter chamber contains opposing moving and stationary contacts. At least a portion of the moving contact extends out of the vacuum interrupter chamber and connects to the locking mechanism. The locking mechanism includes a first locking member and a second locking member that engage in locking. The first locking member is connected to the moving contact, and the second locking member is fixedly disposed. The first locking member includes a first locking portion, and the second locking member includes a second locking portion. When the moving and stationary contacts are in a first contact position, the first locking portion and the second locking portion engage in locking. When the second locking part is misaligned, and a short-circuit current passes through the moving contact and the stationary contact, the electric repulsive force drives the moving contact to move and separate from the stationary contact. When the moving contact moves from the first position to the second position, the first locking part connects with the second locking part, and the first locking member and the second locking member lock together. The locking mechanism locks the moving contact, keeping the moving contact and the stationary contact in a separated state, preventing the moving contact from resetting, which would cause continuous arcing between the moving contact and the stationary contact, damaging the moving contact and the stationary contact. This utility model can improve the service life of the moving contact and the stationary contact and ensure the normal use of the vacuum circuit breaker.

[0024] In addition, the repulsion locking device also includes an auxiliary repulsion mechanism for providing electric repulsion force. The auxiliary repulsion mechanism includes a moving connecting plate and a stationary connecting plate arranged at intervals facing each other. A flexible conductor is electrically connected between the moving connecting plate and the stationary connecting plate. The moving connecting plate is connected to the moving contact, which can change the current flow direction to generate an electric repulsion force between the stationary connecting plate and the moving connecting plate. After the moving connecting plate and the stationary connecting plate are repelled, they drive the moving contact to move away from the stationary contact, causing the vacuum circuit breaker to open. The moving connecting plate is connected to the locking mechanism, and after the moving connecting plate is repelled a certain distance, it is locked by the locking mechanism. Attached Figure Description

[0025] Figure 1 This is an exploded view of the repulsion locking device of this utility model;

[0026] Figure 2 This is a structural schematic diagram of a portion of the repulsion locking device of this utility model after being cut open;

[0027] Figure 3 This is a structural schematic diagram of the second locking component of this utility model;

[0028] Figure 4 This is a schematic diagram of the internal structure of the vacuum circuit breaker when the moving contact is in the first position.

[0029] Figure 5 yes Figure 4 A schematic diagram of the locking mechanism;

[0030] Figure 6 This is a schematic diagram of the internal structure of the vacuum circuit breaker when the moving contact is in the second position.

[0031] Figure 7 yes Figure 6 A schematic diagram of the locking mechanism;

[0032] Figure 8 This is a schematic diagram of the vacuum circuit breaker of this utility model in the tripped state;

[0033] Figure 9 yes Figure 8 A schematic diagram of the locking mechanism;

[0034] Figure 10 This is a cross-sectional view of the vacuum circuit breaker of this utility model in the tripped state;

[0035] Figure 11 This is a cross-sectional view of the vacuum circuit breaker of this utility model in the closed state;

[0036] The reference numerals in the attached drawings include: vacuum interrupter 1; auxiliary repulsion mechanism 2; locking mechanism 3; moving contact 41; stationary contact 42; operating mechanism 100; thermal and magnetic protection mechanism 101; moving contact support 43; moving connecting plate 21; stationary connecting plate 22; bent extension 23; contact spring 73; insulating bracket 6; first through hole 61; third through hole 63; first locking element 31; second locking element 32; limiting plate 33; limiting hole. 34; Mounting component 35; Swing hook 36; Elastic component 37; Support arm 351; Horizontal shaft 352; First swing arm 361; Second swing arm 362; Mounting plate 311; Strip groove 431; Strip protrusion 432; Annular protrusion 62; Upper lead wire 71; Lower lead wire 72; Stationary contact mounting part 421; First linkage component 81; Unlocking linkage part 82; Rotating shaft assembly 83; Contact bracket 84; Elastic component bracket 85; Linkage plate 86. Detailed Implementation

[0037] The specific embodiments of this utility model are further described below with reference to the accompanying drawings. The scope of protection of this utility model is not limited to the description of the following embodiments.

[0038] like Figures 1-9 As shown, this application provides a vacuum circuit breaker, including a housing, a vacuum interrupter 1, a moving contact 41, a stationary contact 42, an operating mechanism 100, and a thermal-magnetic protection mechanism 101. The operating mechanism 100 is connected between a handle and the moving contact 41. Driving the operating mechanism 100 via the handle enables the moving contact 41 to perform opening and closing operations. The thermal-magnetic protection mechanism 101 is used to trigger the operating mechanism 100 to trip in the event of overload or short-circuit faults, thereby protecting the circuit. This embodiment of the vacuum circuit breaker uses a thermal-magnetic protection mechanism 101, providing both overload and short-circuit protection functions. Of course, separate overload and short-circuit protection mechanisms can also be used, which is prior art in this field.

[0039] The housing includes a base, inside which a repulsion locking device is provided. The repulsion locking device includes a vacuum interrupter chamber 1 and a locking mechanism 3. Inside the vacuum interrupter chamber 1 are opposing moving contacts 41 and stationary contacts 42. At least the contact portion of the moving contacts 41 and stationary contacts 42 is located inside the vacuum interrupter chamber 1. Because the vacuum environment contains almost no conductive particles, the arc generated between the moving contacts 41 and stationary contacts 42 can be quickly extinguished when the circuit breaker is opening or closing, ensuring the high reliability and long lifespan of the vacuum circuit breaker. When the current suddenly increases, the electrodynamic repulsion force between the moving contacts 41 and stationary contacts 42 also suddenly increases, causing the moving contact 41 to be repelled and move away from the stationary contact 42.

[0040] The locking mechanism 3 includes a first locking member 31 and a second locking member 32 that cooperate for locking. The first locking member 31 is connected to the moving contact 41, and the second locking member 32 is fixedly disposed. The first locking member 31 includes a first locking part, and the second locking member 32 includes a second locking part. When the moving contact 41 is in a first position in contact with the stationary contact 42, the first locking part and the second locking part are misaligned. After the moving contact 41 is repelled by an electric repulsive force, when the moving contact 41 moves from the first position to the second position, the first locking part and the second locking part are connected, so that the first locking member 31 and the second locking member 32 are locked.

[0041] Preferably, the repulsion locking device further includes a moving contact support 43 and an auxiliary repulsion mechanism 2. The moving contact 41 is located inside the vacuum interrupter chamber and is connected to the moving contact support 43. The moving contact support 43 extends at least partially out of the vacuum interrupter chamber 1 and is connected to the auxiliary repulsion mechanism 2. The auxiliary repulsion mechanism 2 is connected to the locking mechanism 3. When the load is short-circuited, the current flowing through the vacuum circuit breaker suddenly increases. When the short-circuit current passes through the auxiliary repulsion mechanism 2, the electric repulsion force generated by the auxiliary repulsion mechanism 2 increases, thereby driving the moving contact support 43 to move rapidly, causing the moving contact 41 and the stationary contact 42 to separate rapidly, so that the moving contact 41 moves away from the stationary contact 42. The locking mechanism 3 locks the auxiliary repulsion mechanism 2 to keep the moving contact 41 and the stationary contact 42 in a separated state, preventing the moving contact 41 from resetting, which would cause continuous arcing between the moving contact and the stationary contact, damaging the moving contact and the stationary contact. This utility model can improve the service life of the moving contact and the stationary contact.

[0042] like Figure 1 and Figure 2 As shown, the auxiliary repulsion mechanism 2 includes a moving connecting plate 21 and a stationary connecting plate 22 arranged at intervals facing each other. The moving connecting plate 21 and the stationary connecting plate 22 are electrically connected. Specifically, in this embodiment, the moving connecting plate 21 and the stationary connecting plate 22 are electrically connected through a flexible conductor. The moving contact support 43 is connected to the moving connecting plate 21. When the short-circuit current flowing through the moving connecting plate 21, the flexible conductor, and the stationary connecting plate 22 generates an electric repulsive force that causes the moving connecting plate 21 to move rapidly relative to the stationary connecting plate 22, the moving connecting plate 21 drives the moving contact 41 and the stationary contact 42 to separate. The locking mechanism 3 locks the moving connecting plate 21 to keep the moving contact 41 and the stationary contact 42 in a separated state. The flexible conductor can be made of copper braided wire or a conductive flexible material. The two ends of the flexible conductor can be connected to the moving connecting plate 21 and the stationary connecting plate 22 by welding or riveting. Specifically, the first locking member 31 is connected to the moving connecting plate 21.

[0043] The auxiliary repulsion mechanism 2 can be used to increase the electric repulsion force during a short circuit, and the moving contact support 43 can better control the contact parameters of the product, including the opening distance and overtravel. It should be noted that in other embodiments, the auxiliary repulsion mechanism 2 and the moving contact support 43 may be omitted, and the moving contact 41 may be directly connected to the first locking member 31.

[0044] Alternatively, the auxiliary repulsion mechanism 2 can be configured without the moving contact support 43, with one end of the moving contact 41 extending toward the auxiliary repulsion mechanism 2, extending out of the vacuum interrupter 1 and connecting to the auxiliary repulsion mechanism 2, and the auxiliary repulsion mechanism 2 connected to the first locking member 31;

[0045] Alternatively, the moving contact support 43 can be configured without the auxiliary repulsion mechanism 2, with one end of the moving contact support 43 connected to the moving contact 41 and the other end connected to the first locking member 31. All of these are possible and fall within the scope of this application.

[0046] In one embodiment, the auxiliary repulsion mechanism 2 may be omitted, and only the moving connection plate 21 may be provided. One side of the moving connection plate 21 is connected to the moving contact 41 or the moving contact support 43, and the other side is connected to the first locking member 31.

[0047] Preferably, at least one flexible conductor is electrically connected between the stationary connecting plate 22 and the moving connecting plate 21. The flexible conductor causes the moving connecting plate 21 and the stationary connecting plate 22 to be spaced apart, forming an insulating area between the moving connecting plate 21 and the stationary connecting plate 22, thereby preventing the moving connecting plate 21 and the stationary connecting plate 22 from sticking together.

[0048] Furthermore, the moving connecting plate 21 includes a first connecting end, and the stationary connecting plate 22 includes a second connecting end opposite to the first connecting end. The flexible conductor connects between the first connecting end and the second connecting end.

[0049] Specifically, in this embodiment, the first connecting end is the upper end of the moving connecting plate 21, the second connecting end is the upper end of the stationary connecting plate 22, the two ends of the flexible conductor are respectively connected to the upper end of the moving connecting plate 21 and the upper end of the stationary connecting plate 22, the lower ends of the moving connecting plate 21 and the lower ends of the stationary connecting plate 22 are spaced apart, and the upper ends of the moving connecting plate 21 and the upper ends of the stationary connecting plate 22 are the ends away from the bottom of the base.

[0050] Preferred, such as Figure 1 and Figure 2 As shown, the moving connecting plate 21 is located on the side of the stationary connecting plate 22 away from the moving contact 41. The stationary connecting plate 22 includes a third through hole 63. The moving contact support 43 passes through the third through hole 63 and is connected to the side of the moving connecting plate 21 facing the moving contact 41. The locking mechanism 3 is connected to the side of the moving connecting plate 21 away from the moving contact 41. The upper end of the moving connecting plate 21 includes a bent extension 23, preferably at a right angle. The bent extension 23 is located above the stationary connecting plate 22 and is insulated from it. The end of the stationary connecting plate 22 away from the bent extension 23 is integrally formed with and bent to the lower lead 72. The lower lead 72 extends in a direction away from the moving contact 41. One end of the moving contact support 43 is connected to the side of the moving connecting plate 21 facing the moving contact 41, and the other end is connected to the moving contact 41. The locking mechanism 3 is connected to the side of the moving connecting plate 21 facing away from the moving contact 41. The bent extension 23 is used to cooperate with the operating mechanism to achieve closing locking.

[0051] Preferred, such as Figure 1 As shown, in this embodiment, the bent extension 23 is located in the middle of the upper end of the moving connecting plate 21, and the middle of the upper end of the stationary connecting plate 22 includes a first notch. The bent extension 23 is located above the first notch or partially located within the first notch. The stationary connecting plate 22 is spaced apart from the bent extension 23 in the vertical direction through the first notch to form an insulating gap.

[0052] Of course, in other embodiments, the bent extension 23 may also be located on one side of the upper end of the moving connection plate 21, and the first notch may be provided on one side of the upper end of the stationary connection plate 22. The first notch and the bent extension 23 may correspond in the vertical direction to form the insulation gap; or, the upper end of the stationary connection plate 22 may not be provided with the first notch, and the bent extension 23 and the upper end of the stationary connection plate 22 may be spaced apart in the vertical direction.

[0053] In another possible implementation, an insulating element is installed on the upper end of the static connecting plate 22, and the bent extension 23 is supported on the insulating element. In a preferred embodiment, an insulating groove is provided on the insulating element, and the bent extension 23 is located in the insulating groove, limited by the insulating groove, and can slide in the insulating groove.

[0054] Preferred, such as Figure 4 As shown, the repulsion locking device also includes a contact spring 73, which drives the moving contact 41 to move towards the stationary contact 42, causing the moving contact 41 and the stationary contact 42 to contact. Since this embodiment is a vacuum interrupter 1, the moving contact support 43 moves in and out of the vacuum interrupter 1, causing a change in the pressure inside the vacuum interrupter 1. After the moving contact 41 and the stationary contact 42 are repelled, the moving contact support 43 slides out of the vacuum interrupter 1, causing the pressure inside the vacuum interrupter 1 to decrease and the pressure difference inside and outside the vacuum interrupter 1 to increase. Under the action of atmospheric pressure, it also has the force to drive the moving contact 41 and the stationary contact 42 to close.

[0055] Compared to existing technologies, the flexible conductor allows the stationary connecting plate 22 and the moving connecting plate 21 to be spaced apart, changing the current flow direction. This causes the current to flow through the flexible conductor, resulting in opposite current flows between the moving connecting plate 21 and the stationary connecting plate 22. This generates a first electrodynamic repulsion force, also known as Lorentz force, between the moving connecting plate 21 and the stationary connecting plate 22. When a load short circuit occurs in the circuit, the current increases dramatically, and the first electrodynamic repulsion force increases instantaneously, overcoming the forces of the contact spring 73 and atmospheric pressure, driving the moving connecting plate 21 away from the stationary connecting plate 22. In directional movement, the first electric repulsive force drives the moving contact 41 and the stationary contact 42 to separate. The flexible conductor can be, but is not limited to, a cable composed of multiple strands of fine wires. The flexible conductor has high flexibility and conductivity. At the moment when the moving contact 41 closes with the stationary contact 42 under the action of the contact spring 73 and the pressure inside and outside the vacuum interrupter, the moving connecting plate 21 impacts the stationary connecting plate 22. Since the flexible conductor is set between the moving connecting plate 21 and the stationary connecting plate 22, it can play a buffering role between the moving connecting plate 21 and the stationary connecting plate 22.

[0056] Furthermore, when the moving contact 41 and the stationary contact 42 break, a second electrodynamic repulsive force, namely the Holm force, exists between them. This second electrodynamic repulsive force helps the moving contact 41 and the stationary contact 42 separate quickly. Specifically, when the moving contact 41 and the stationary contact 42 break, the current between them generates a magnetic field, which in turn exerts a reverse force on the current, namely the Holm force. When the circuit is short-circuited, the current increases dramatically, and the Holm force suddenly increases, which helps to accelerate the separation of the moving contact 41 and the stationary contact 42. In this embodiment, since the moving contact 41 and the stationary contact 42 are located inside the vacuum interrupter 1, the vacuum interrupter 1 can enhance the effect of the Holm force, further increasing the speed of contact separation.

[0057] Preferred, such as Figure 1 and Figure 2 As shown, the repulsion locking device also includes an insulating bracket 6, which is preferably a plastic bracket. The insulating bracket 6 is located between the vacuum interrupter 1 and the auxiliary repulsion mechanism 2, and plays an insulating and fixing role for the vacuum interrupter 1 and the auxiliary repulsion mechanism 2, so as to facilitate the fixing of the vacuum interrupter 1 and the auxiliary repulsion mechanism 2 in the base.

[0058] Furthermore, such as Figure 1 and Figure 2As shown, the insulating bracket 6 includes a first through hole 61. The moving contact support 43 extends at least partially out of the vacuum interrupter 1 to form a moving contact support mounting portion. The moving contact support mounting portion is slidably installed within the first through hole 61. The stationary connecting plate 22 includes a third through hole 63. The stationary connecting plate 22 is fixedly installed with the insulating bracket 6. The moving contact support mounting portion passes through the first through hole 61 and the third through hole 63 and is electrically connected to the moving connecting plate 21. The moving contact support 43 has a columnar structure; in this embodiment, it is preferably a cylinder, which can produce a smooth sliding effect.

[0059] In addition, such as Figure 1 As shown, in one possible implementation, for ease of assembly, the moving contact support mounting portion can be partially divided to form a shape as shown in the diagram. Figure 1 The cylindrical metal part shown is installed inside the first through hole 61.

[0060] Preferred, such as Figure 2 As shown, the stationary contact 42 includes an annular groove located in the middle. One end of the outer shell of the vacuum interrupter 1 includes a fourth through hole, and the other end includes a fifth through hole. The annular groove of the stationary contact 42 is locked in the fourth through hole, sealing the fourth through hole. The moving contact support 43 extends out from the fifth through hole, sealing the fifth through hole. The moving contact support 43 partially extends out of the fifth through hole to form the moving contact support mounting part.

[0061] Preferred, such as Figures 1-3 As shown, the locking mechanism 3 includes a first locking member 31 and a second locking member 32 that cooperate for locking. One of the first locking member 31 and the second locking member 32 is connected to the moving connecting plate 21, while the other is fixedly disposed. The first locking member 31 includes a limiting hole 34, and the second locking member 32 includes a swing hook 36. One end of the swing hook 36 includes a hook that can extend into the limiting hole 34 to complete the locking. When the moving contact 41 is in a first position in contact with the stationary contact 42, the limiting hole 34 and the hook are misaligned. When the moving contact 41 moves from the first position to a second position where the limiting hole 34 corresponds to the hook, the hook extends into the limiting hole 34 of the limiting plate 33, thereby locking the first locking member 31 and the second locking member 32.

[0062] Furthermore, in other embodiments, the first locking member 31 includes a hook, and the second locking member 32 includes a limiting hole 34; or, the first locking member 31 includes a first hook, and the second locking member 32 includes a second hook opposite to the first hook, with the first hook and the second hook cooperating to achieve locking. Alternatively, the first locking member 31 may be provided with a slot, and the second locking member 32 may be provided with a protrusion for locking engagement; all of these are possible, and the locking mechanism 3 is not limited to the embodiments of this application.

[0063] Furthermore, the first locking member 31 is connected to the dynamic connection plate 21, and the second locking member 32 is fixed in the base of the vacuum circuit breaker. The first locking member 31 includes a limiting plate 33, and a limiting part is provided on the limiting plate 33. The limiting part may be, but is not limited to, the limiting hole 34, the limiting groove, or the limiting hook. In this embodiment, the limiting part is the limiting hole 34. Figure 3 A schematic diagram of the structure of the second locking member 32 is shown. The second locking member 32 includes a mounting member 35, a swing hook 36 movably mounted on the mounting member 35, and an elastic member 37 connecting the swing hook 36 and the mounting member 35. The elastic member 37 drives the swing hook 36 to rotate so that the hook is in a limited engagement with the limiting plate 33. Specifically, in this embodiment, the rotation direction is clockwise. The elastic member 37 ensures that the swing hook 36 always has rotational potential energy. The elastic member 37 can be, but is not limited to, a torsion spring, a tension spring, a compression spring, or a spring.

[0064] Furthermore, such as Figure 3 and Figure 9 As shown, two support arms 351 extend from one side of the mounting member 35, and the swing hook 36 is located between the two support arms 351. A horizontal axis 352 is provided between the two support arms 351. The swing hook 36 and the elastic member 37 are mounted on the horizontal axis 352, and the elastic member 37 is connected to the swing hook 36 to drive the swing hook 36 to rotate around the horizontal axis 352. The swing hook 36 includes a first swing arm 361 and a second swing arm 362 connected together. The connecting part of the first swing arm 361 and the second swing arm 362 is rotatably mounted on the horizontal axis 352. The first swing arm 361 includes the hook, which is used to lock with the limiting hole 34 of the first locking member 31. Under the drive of the elastic member 37, the second swing arm 362 abuts against the bottom of the mounting member 35. The bottom of the mounting member 35 is the side of the mounting member 35 facing the bottom of the base. One end of the elastic member 37 is connected to the first swing arm 361, and the other end is connected to the mounting member 35.

[0065] Furthermore, such as Figure 3 As shown, the middle part of the first swing arm 361 has an arc-shaped structure, that is, the cross-section of the first swing arm 361 is "C" shaped, and the outer convex surface of the first swing arm 361 abuts against one end of the torsion spring, which is conducive to the limiting cooperation between the first swing arm 361 and the limiting plate 33 of the first locking member 31.

[0066] Preferred, such as Figure 1 As shown, the first locking member 31 also includes a mounting plate 311, which is integrally formed with the limiting plate 33 and bent and connected. Preferably, the bending angle between the mounting plate 311 and the limiting plate 33 is a right angle. The first locking member 31 is fixed on the side of the moving connecting plate 21 facing away from the stationary connecting plate 22, and the mounting plate 311 is in contact with the moving connecting plate 21.

[0067] One end of the moving contact support 43 is connected to the moving contact 41, and the other end is abutted and fixedly connected to the side of the moving connecting plate 21 facing the stationary connecting plate 22. The side of the moving connecting plate 21 facing away from the stationary connecting plate 22 is attached to the mounting plate 311 of the first locking member 31, so that the moving contact 41, the moving contact support 43, the moving connecting plate 21, and the first locking member 31 are fixed together and move synchronously. After the moving contact 41 is pushed open, the moving contact 41 drives the moving contact support 43, the moving connecting plate 21, and the first locking member 31 to move synchronously away from the stationary contact 42. The contact spring 73 drives the moving contact 41, the moving contact support 43, the moving connecting plate 21, and the first locking member 31 to move towards the stationary contact 42. In this embodiment, the moving contact 41 has a first mounting groove with the opening of the first mounting groove facing the moving contact support 43. The moving contact support 43 has a second through hole through it along the moving direction of the moving contact 41. The moving connecting plate 21 has a third through hole. The mounting plate 311 of the first locking member 31 has a fourth through hole. The first mounting groove, the second through hole, the third through hole and the fourth through hole correspond one-to-one along the moving direction of the moving contact 41. The screw is inserted sequentially from the side of the moving connecting plate 21 facing away from the stationary connecting plate 22 into the fourth through hole, the third through hole, the second through hole and the first mounting groove to fix the moving contact 41, the moving contact support 43, the moving connecting plate 21 and the first locking member 31.

[0068] Preferred, such as Figure 1 and Figure 2 As shown in this embodiment, the limiting plate 33 includes a clearance area for avoiding the hook of the second locking member 32 or for avoiding the first swing arm 361. The limiting plate 33 includes a first limiting plate segment, a second limiting plate segment, and a third limiting plate segment connected in sequence by bending. One end of the first limiting plate segment is connected to the second limiting plate segment, and the other end is connected to one end of the mounting plate 311. The first limiting plate segment is parallel to the third limiting plate segment, and the clearance area is formed between the third limiting plate segment and the second limiting plate segment. When the moving contact 41 is in the first position, the hook can extend into the clearance area and abut against the bottom of the limiting plate 33 without extending into the limiting hole 34. Compared with the limiting plate 33 with a straight plate structure, the limiting plate 33 with a bent structure can release some space, so that the space in the base can be effectively utilized.

[0069] Furthermore, such as Figure 1 and Figure 2 As shown, the limiting hole 34 is at least opened on the third section of the limiting plate. In this embodiment, the limiting hole 34 is opened on the second section of the limiting plate and extends to both the first and third sections of the limiting plate. This design makes it easier for the hook to extend into the limiting hole 34 and for the hook to be more easily attached to the third section of the limiting plate.

[0070] Furthermore, such as Figure 3As shown, the two support arms 351 of the mounting member 35 have two second through holes. The horizontal shaft 352 passes through the two second through holes and extends from the back of the two support arms 351 to form two second mounting portions. The second mounting portions have horizontal shaft slots. By inserting a card into the horizontal shaft slot, the horizontal shaft 352 can be fixed to the mounting member 35. In one embodiment, the horizontal shaft 352 can rotate between the two support arms 351, and the swing hook 36 is fixed to the horizontal shaft 352; in another embodiment, the horizontal shaft 352 is fixed to the two support arms 351, and the swing hook 36 rotates around the horizontal shaft 352; in yet another embodiment, the horizontal shaft 352 can rotate between the two support arms 351, and the swing hook 36 can also rotate around the horizontal shaft 352.

[0071] When the moving contact 41 is in the first position, the end of the hook of the swing hook 36 abuts against the bottom of the limiting plate 33 of the first locking member 31, and the bottom of the limiting plate 33 is the side of the limiting plate 33 facing the bottom of the base; when the moving contact 41 is in the second position, the swing hook 36, driven by the elastic member 37, extends into the limiting hole 34 of the limiting plate 33, thereby locking and limiting the first locking member 31 and the second locking member 32. The first position is the position where the moving contact 41 contacts the stationary contact 42 when the vacuum circuit breaker is closed. The second position is both the position of the moving contact 41 when the locking device is locked after the vacuum circuit breaker is short-circuited and the position of the moving contact 41 when the circuit breaker is open. Preferably, the second position is the position of the moving contact 41 at the maximum opening distance. Of course, there can also be a certain distance between the second position and the maximum opening distance. That is, when the moving contact 41 moves from the first position to the second position, the moving contact 41 reaches the maximum opening distance only after it passes the second position. The moving contact 41 resets and retracts to lock the first locking member 31 and the second locking member 32. Figure 4 A schematic diagram of the internal structure of the base is shown when the moving contact 41 is in the first position. Figure 5 for Figure 4 A schematic diagram of the locking mechanism 3. Figure 6 A schematic diagram of the internal structure of the base is shown when the moving contact 41 is in the second position. Figure 7 for Figure 6 A schematic diagram of the locking mechanism 3.

[0072] Furthermore, such as Figure 3 As shown in the embodiment of this application, the mounting component 35 is a flat plate structure, and the mounting component 35 includes a plurality of mounting through holes, which can be used to fix and install it to the base by screws.

[0073] Furthermore, such as Figure 1 and Figure 2As shown, at least one strip groove 431 is formed on the side wall of the moving contact support 43 along the sliding direction of the moving contact support 43, and at least one strip protrusion 432 is provided on the inner wall of the first through hole 61. The at least one strip groove 431 and the at least one strip protrusion 432 are mutually restrictive and engaged; or, at least one strip groove 431 is provided on the inner wall of the first through hole 61, and at least one strip protrusion 432 is provided on the side wall of the moving contact support 43 along the sliding direction of the moving contact support 43. The at least one strip groove 431 and the at least one strip protrusion 432 are mutually restrictive and engaged.

[0074] like Figures 1-2 As shown in the preferred embodiment of this application, two strip-shaped grooves 431 are spaced apart and opposite to each other on the side wall of the moving contact support 43 along the length direction of the moving contact support 43, and two strip-shaped protrusions 432 are spaced apart and opposite to each other on the inner wall of the first through hole 61. The strip-shaped protrusions 432 and the strip-shaped grooves 431 are matched for limiting, and the cross-sections of the strip-shaped protrusions 432 and the strip-shaped grooves 431 are rectangular or arc-shaped or other structural shapes used for limiting. After the strip-shaped protrusions 432 and the strip-shaped grooves 431 are installed, they can achieve the limiting effect to prevent the moving contact support 43 from driving the moving contact 41 to rotate in the vacuum interrupter 1. When the moving contact support 43 rotates in the vacuum interrupter 1, it will affect the vacuum degree inside the vacuum interrupter 1 and affect the insulation performance of the vacuum interrupter 1.

[0075] Preferred, such as Figure 1 and Figure 2 As shown, the insulating bracket 6 includes a boss on the side facing the stationary connecting plate 22. The first through hole 61 penetrates the boss to form an annular protrusion 62. The annular protrusion 62 is installed in the third through hole 63, and at least partially protrudes from the third through hole 63. The annular protrusion 62 is used for fixed installation between the insulating bracket 6 and the stationary connecting plate 22, and also serves as electrical insulation between the stationary connecting plate 22 and the moving contact support 43.

[0076] Specifically, such as Figure 1 and Figure 2As shown, in this embodiment, the static connecting plate 22 and the insulating bracket 6 are fitted together. The static connecting plate 22 includes a third through hole 63 and multiple sixth through holes. Multiple sixth mounting slots are opened on the insulating bracket 6, and the multiple sixth mounting slots and multiple sixth through holes correspond one-to-one. The annular protrusion 62 of the insulating bracket 6 is installed in the third through hole 63 and partially protrudes from the third through hole 63. The protruding part is located between the static connecting plate 22 and the moving connecting plate 21, which can enhance the insulation between the metal parts and the static connecting plate 22. Multiple screws can be inserted one-to-one into the multiple sixth through holes and multiple sixth mounting slots to fix the static connecting plate 22 and the insulating bracket 6.

[0077] Preferred, such as Figure 1 and Figure 2 As shown, the repulsion locking device also includes an upper lead wire 71, which is located outside the vacuum interrupter chamber 1 and is fixedly connected to the end of the stationary contact 42 away from the moving contact 41. The stationary contact 42 extends out of the vacuum interrupter chamber 1 to form a stationary contact mounting portion 421. The upper lead wire 71 is connected to the stationary contact mounting portion 421 and extends in a direction away from the stationary contact 42.

[0078] Specifically, a second mounting groove is provided on the stationary contact mounting part 421, and a fifth through hole is provided on the upper lead wire 71. The fifth through hole and the second mounting groove correspond to each other along the movement direction of the moving contact 41. The screw is inserted into the fifth through hole and the second mounting groove from the side of the upper lead wire 71 facing away from the stationary contact 42 for fixed installation.

[0079] Furthermore, such as Figure 3 As shown, the connecting part of the first swing arm 361 and the second swing arm 362 includes a first through hole, which passes through the horizontal shaft 352; or, the connecting part includes a first buckle, which is snapped onto the horizontal shaft 352, as long as the swing hook 36 can be fixed on the horizontal shaft 352 and rotate around the horizontal shaft 352; in this embodiment, the elastic element 37 is preferably a torsion spring, which passes through the horizontal shaft 352 and abuts against the first swing arm 361 at one end and against the bottom of the mounting member 35 at the other end, the bottom of the mounting member 35 being the side of the mounting member 35 facing the bottom of the base.

[0080] Preferred, such as Figures 1-9 As shown, the vacuum circuit breaker includes a linkage mechanism connected to a handle or operating mechanism 100, used to move the moving connection plate 21 and drive the locking mechanism 3 to release the lock on the moving connection plate 21. Specifically, when the handle or operating mechanism 100 performs a closing and / or re-clamping operation, or when the operating mechanism 100 trips, the locking mechanism 3 is driven to release the lock on the moving connection plate 21.

[0081] The linkage mechanism of this embodiment includes a first linkage member 81 and a rotating shaft assembly 83. The rotating shaft assembly 83 includes an unlocking linkage part 82 and at least one contact bracket 84. The operating mechanism 100 is connected to the contact bracket 84. The contact bracket 84 connects the first linkage member 81 and the unlocking linkage part 82. The first linkage member 81 is connected to the moving contact 41. The unlocking linkage part 82 cooperates with the second locking member 32.

[0082] When the operating mechanism 100 drives the contact support 84 to rotate, the contact support 84 drives the moving contact 41 to move through the first linkage 81 to realize the opening and closing of the circuit breaker;

[0083] When the operating mechanism 100 is disengaged, the contact support 84 is driven to rotate, causing the unlocking linkage 82 to activate and release the locking mechanism 3 from locking the moving contact 41.

[0084] Preferably, the unlocking linkage part 82 and at least one of the contact brackets 84 are integrally formed. In this embodiment, the unlocking linkage part 82 is located at the bottom of the locking mechanism 3, specifically at the bottom of the second locking member 32, and cooperates with the swing hook 36 of the second locking member 32. That is, the linkage mechanism of this embodiment simultaneously has the functions of driving the moving connecting plate 21 to move for closing and opening, and releasing the locking mechanism 3 from locking the moving connecting plate 21. Of course, the linkage mechanism may also only have the unlocking linkage part 82.

[0085] In other embodiments, a separate release mechanism can be provided to release the locking mechanism 3 from the moving connection plate 21. This release mechanism can be driven by a handle or operating mechanism 100 during closing and / or re-locking operations. Alternatively, a separate release mechanism button or drive unit can be provided. Figure 8 This diagram shows the internal structure of the base of the vacuum circuit breaker when it is in the tripped state. Figure 9 for Figure 8 The schematic diagram of the locking mechanism 3 shows that when the vacuum circuit breaker is in the tripped state, the limiting plate 33 of the first locking member 31 and the hook of the second locking member 32 are in a separated state.

[0086] The operation process of the circuit breaker in this embodiment is as follows:

[0087] When the handle is used for normal opening and closing operations via the operating mechanism 100, the operating mechanism 100 drives the moving connection plate 21 through the first linkage 81, and the moving contact 41 is moved to the first position that contacts the stationary contact 42 or the second position that is opened or tripped through the moving connection plate 21.

[0088] In the closed state, i.e., when the moving contact 41 is in contact with the stationary contact 42, when a short circuit fault occurs, the electro-repulsive force generated by the short circuit current is huge and will act before the thermal-magnetic protection mechanism 101. The electro-repulsive force generated by the short circuit current flowing through the moving connecting plate 21, the flexible conductor, and the stationary connecting plate 22 causes the moving connecting plate 21 to move rapidly relative to the stationary connecting plate 22. The moving connecting plate 21 drives the moving contact 41 to slide from the first position to the second position, and the swing hook 36 rotates clockwise, so that the hook of the swing hook 36 extends into the limiting hole 34, and the locking mechanism 3 is completed. The locking mechanism prevents the moving contact 41 from being reset by the moving connecting plate 21, which would cause continuous arcing between the moving and stationary contacts. Subsequently, the thermomagnetic protection mechanism 101 also triggers the operating mechanism 100 to trip. When the operating mechanism 100 trips, the unlocking linkage part 82 drives the swing hook 36 of the second locking member 32 to overcome the elastic force of the elastic member 37 and rotate around the horizontal axis 352, so that the hook extends out of the limiting hole 34 of the limiting plate 33. The first locking member 31 and the second locking member 32 are unlocked, and the moving contact 41 and the stationary contact 42 are in the tripped state.

[0089] When an overload fault occurs, the electric repulsion force generated by the overload current is usually small and insufficient to make the moving connection plate 21 move relative to the stationary connection plate 22. The thermomagnetic protection mechanism 101 triggers the operating mechanism 100 to trip. The tripped operating mechanism 100 drives the moving connection plate 21 through the first linkage 81. The moving connection plate 21 drives the moving contact 41 to move to the opening position separated from the stationary contact 42, i.e., the second position. During the opening process, the unlocking linkage 82 has also reached the opening position. Therefore, the unlocking linkage 82 pushes against the second locking member 32, so that the swing hook 36 and the limit plate 33 are spaced apart. The first locking member 31 and the second locking member 32 are in the unlocked state, that is, the moving contact 41 and the stationary contact 42 are in the tripped state.

[0090] In this embodiment, during the normal opening operation and overload tripping of the circuit breaker, when the moving contact 41 moves to the second position, the unlocking linkage 82 also rotates to a position where the second locking member 32 and the first locking member 31 are spaced apart. The first locking member 31 and the second locking member 32 will not lock. Only when the electric repulsive force caused by the short circuit or the huge current drives the moving connecting plate 21 to move the moving contact 41 to the second position will the locking mechanism 3 lock the moving connecting plate 21. After that, the operating mechanism will disengage and unlock the locking mechanism 3.

[0091] In this embodiment, the open position and the second position are the same. Of course, in other embodiments, the open position and the second position are not the same; the open position is located between the first and second positions. During normal opening operation and overload tripping, the moving connection plate 21 drives the moving contact 41 to the open position, and the locking mechanism 3 does not lock the moving connection plate 21. If the electric repulsive force caused by a short circuit moves the moving connection plate 21 to the second position and locks it with the locking mechanism 3, it is also possible for the handle or operating mechanism to drive the locking mechanism 3 to release the lock on the moving connection plate 21 when performing a closing or re-clamping operation.

[0092] Preferred, such as Figure 10 and Figure 11 As shown, the rotating shaft assembly 83 is used to drive the vacuum circuit breaker to open and close. The operating mechanism 100 is connected to the rotating shaft assembly 83, and the rotating shaft assembly 83 is connected to the moving contact 41. The rotating shaft assembly 83 can drive the moving contact 41 to reciprocate along a straight line to contact or separate from the stationary contact 42, thereby increasing the contact pressure between the moving contact 41 and the stationary contact 42 and improving the stability of the vacuum circuit breaker when connecting, carrying and breaking current. The rotating shaft assembly 83 includes at least one contact bracket 84, which is rotatably disposed. The contact bracket 84 is provided with a bracket drive part connected to the operating mechanism 100. An elastic element bracket 85 and a linkage plate 86 are rotatably installed inside the contact bracket 84. At least one elastic element is connected between the elastic element bracket 85 and the contact bracket 84. The linkage plate 86 includes a first linkage part and a second linkage part located on both sides of the rotation axis of the linkage plate 86. In this embodiment, the first linkage part 81 is a connecting rod. The first linkage part is hinged to one end of the first linkage part 81, and the other end of the first linkage part 81 is hinged to the moving connecting plate 21 or the first locking member 31. The moving contact is driven to reciprocate along a straight line through the first linkage part 81. The elastic element acts on the first linkage part through the elastic element bracket 85 to drive the linkage plate 86 to rotate, so that the second linkage part abuts against and limits the contact bracket 84.

[0093] The operating mechanism 100 can drive the contact support 84 to rotate between a first position and a second position. When closing, the operating mechanism 100 drives the contact support 84 to rotate from the second position to the first position; when opening and / or tripping, the operating mechanism 100 drives the contact support 84 to rotate from the first position to the second position. (Reference) Figure 11When the circuit is closed, the contact bracket 84 rotates counterclockwise from the second position to the first position. The contact bracket 84, through the elastic element and the elastic element bracket 85, pushes the first linkage part. The first linkage part, through the first linkage element 81, drives the moving contact 41 to move linearly and contact the stationary contact 42. After the moving contact 41 contacts the stationary contact 42, the contact bracket 84 continues to rotate at a certain angle, compressing the elastic element. This causes the elastic element to push the first linkage part to press the moving contact 41 and the stationary contact 42 tightly together. The second linkage part releases its contact limit from the contact bracket 84, at which point the contact bracket 84 is in the first position. (See also...) Figure 10 When the circuit is opened or tripped, the contact bracket 84 rotates clockwise from the first position to the second position. The contact bracket 84 abuts against the second linkage part. The contact bracket 84 pushes the second linkage part, causing the first linkage part to drive the moving contact 41 to move linearly and separate from the stationary contact 42 through the first linkage member 81. The contact bracket 84 is then in the second position.

[0094] Furthermore, such as Figure 10 and Figure 11 As shown, the unlocking linkage part 82 is integrally formed with the contact bracket 84. Specifically, the unlocking linkage part 82 protrudes above the contact bracket 84 and cooperates with the second swing arm 362 of the locking mechanism 3. When the circuit breaker is in the tripped state, the operating mechanism 100 drives the contact bracket 84 to rotate so that the unlocking linkage part 82 and the second swing arm 362 abut against each other, driving the swing hook 36 of the locking mechanism 3 to rotate, so that the hook is spaced apart from the limiting plate 33, thereby realizing the locking release of the locking mechanism 3.

[0095] It should be noted that the shaft assembly 83 and the connection structure between the shaft assembly 83 and the moving contact 41 are not only applicable to the vacuum circuit breaker in the embodiments of this application, but also applicable to other switching devices, such as molded case circuit breakers, vacuum molded case circuit breakers or frame circuit breakers, all of which fall within the protection scope of this application.

[0096] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0097] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A repulsion locking device of a vacuum circuit breaker, comprising a vacuum interrupter (1), a locking mechanism (3), and opposite moving contact (41) and stationary contact (42), at least a contact part of the moving contact (41) and stationary contact (42) being located inside the vacuum interrupter (1), the moving contact (41) being connected to the locking mechanism (3), characterized in that, The locking mechanism (3) comprises a first locking piece (31) and a second locking piece (32) matched with each other, the first locking piece (31) is connected with the movable contact (41), the second locking piece (32) is fixedly arranged, the first locking piece (31) comprises a first locking part, the second locking piece (32) comprises a second locking part, when the movable contact (41) is located at a first position in contact with the fixed contact (42), the first locking part is misaligned with the second locking part, after the movable contact (41) is repelled by the electric repulsive force, when the movable contact (41) moves from the first position to a second position, the second locking piece (32) locks the first locking piece (31) to avoid the reset of the movable contact (41).

2. Repelling locking device according to claim 1, characterized in that The repelling and locking device further comprises an auxiliary repelling mechanism (2), the auxiliary repelling mechanism (2) comprises a movable connecting plate (21) and a fixed connecting plate (22) arranged opposite to each other, the movable connecting plate (21) and the fixed connecting plate (22) are electrically connected through a flexible conductor, the movable connecting plate (21) is connected with the movable contact (41), when the movable connecting plate (21) moves relative to the fixed connecting plate (22) under the electric repulsive force, the movable connecting plate (21) drives the movable contact (41) and the fixed contact (42) to separate, and the locking mechanism (3) locks the movable connecting plate (21) to keep the movable contact (41) and the fixed contact (42) in a separated state.

3. Repelling locking device according to claim 2, characterized in that The movable connecting plate (21) is located on a side of the fixed connecting plate (22) away from the movable contact (41), the fixed connecting plate (22) comprises a third through hole (63), a movable contact support (43) connected with the movable contact (41) passes through the third through hole (63) to be connected with the movable connecting plate (21), the movable connecting plate (21) comprises a first connecting end, the fixed connecting plate (22) comprises a second connecting end opposite to the first connecting end, the first connecting end and the second connecting end are electrically connected through the flexible conductor, one end of the fixed connecting plate (22) away from the second connecting end is integrally formed with and bently connected with a lower lead wire (72), and the lower lead wire (72) extends away from the movable contact (41).

4. Repelling locking device according to claim 3, characterized in that The flexible conductor is arranged between the movable connecting plate (21) and the fixed connecting plate (22).

5. The repelling locking device of claim 1, wherein, Further comprising a linkage mechanism, the linkage mechanism comprises a first linkage piece (81), an unlocking linkage part (82) and at least one contact support (84) rotatably arranged, an operating mechanism (100) is connected with the contact support (84), the contact support (84) is connected with the first linkage piece (81) and the unlocking linkage part (82), the first linkage piece (81) is connected with the movable contact (41), the unlocking linkage part (82) is matched with the second locking piece (32), When the operating mechanism (100) drives the contact support (84) to rotate, the contact support (84) drives the movable contact (41) to move through the first linkage piece (81) to realize the opening and closing of the circuit breaker; When the operating mechanism (100) is tripped, the contact support (84) is driven to rotate to make the unlocking linkage part (82) drive the second locking piece (32) to release the locking of the first locking piece (31).

6. Repellent locking device according to claim 5, characterized in that The operating mechanism (100) drives the moving contact (41) to move to a first position in contact with the static contact (42) or a second position of opening or tripping, when normally opening or tripping, the moving contact (41) moves to the second position, and the unlocking linkage (82) also rotates to a position in which the second locking member (32) is spaced apart from the first locking member (31), and the first locking member (31) and the second locking member (32) are in an unlocked state.

7. Repellent locking device according to claim 5, characterized in that The unlocking linkage (82) and the at least one contact support (84) are integrally formed.

8. The repelling locking device of claim 1, wherein, The first locking member (31) comprises a limiting plate (33) comprising the first locking part, which is a limiting hole (34), and the second locking member (32) comprises a mounting member (35), a swing hook (36) rotatably mounted on the mounting member (35), and an elastic member (37) connected between the swing hook (36) and the mounting member (35), one side of the mounting member (35) extends two support arms (351), the swing hook (36) is located between the two support arms (351), a horizontal shaft (352) is arranged between the two support arms (351), the swing hook (36) and the elastic member (37) are mounted on the horizontal shaft (352), the swing hook (36) comprises a first swing arm (361) and a second swing arm (362) connected, the first swing arm (361) comprises the first locking part, the second locking part is a hook, and the second swing arm (362) cooperates with the mounting member (35).

9. The repelling locking device of claim 1, wherein, The repulsion locking device further comprises an insulating support (6) and a moving contact support (43), the insulating support (6) is located between the vacuum arc-extinguishing chamber (1) and the locking mechanism (3), one end of the moving contact support (43) is connected with the moving contact (41), and the other end penetrates through the insulating support (6) and is connected with the locking mechanism (3).

10. Repellent locking device according to claim 9, characterized in that The insulating support (6) comprises a first through hole (61), the moving contact support (43) at least partially extends out of the vacuum arc-extinguishing chamber (1) to form a moving contact support mounting portion, the moving contact support mounting portion is slidably mounted in the first through hole (61), and the moving contact support mounting portion is electrically connected with the first locking member (31) through the first through hole (61).

11. Repellent locking device according to claim 10, characterized in that At least one strip-shaped sliding groove (431) is formed on a side wall of the moving contact support (43) in a sliding direction of the moving contact support (43), at least one strip-shaped protrusion (432) is arranged on an inner wall of the first through hole (61), and the at least one strip-shaped sliding groove (431) and the at least one strip-shaped protrusion (432) are limitingly matched; or, at least one strip-shaped sliding groove (431) is arranged on the inner wall of the first through hole (61), at least one strip-shaped protrusion (432) is arranged on a side wall of the moving contact support (43) in a sliding direction of the moving contact support (43), and the at least one strip-shaped sliding groove (431) and the at least one strip-shaped protrusion (432) are limitingly matched.

12. The repelling locking device of claim 2, wherein, The repulsion locking device further comprises an insulating support (6) between the vacuum interrupter (1) and the auxiliary repulsion mechanism (2), and a moving contact support (43) connected with the moving contact (41) at one end and connected with the auxiliary repulsion mechanism (2) at the other end through the insulating support (6). The insulating support (6) comprises a first through hole (61), and the moving contact support (43) at least partially extends out of the vacuum interrupter (1) to form a moving contact support mounting portion which is slidingly mounted in the first through hole (61). The static connecting plate (22) comprises a third through hole (63), and the static connecting plate (22) is fixedly mounted with the insulating support (6). The moving contact support mounting portion is electrically connected with the moving connecting plate (21) through the first through hole (61) and the third through hole (63). One side of the insulating support (6) facing the static connecting plate (22) comprises a boss, and the first through hole (61) penetrates the boss to form a ring-shaped protrusion (62) which is mounted in the third through hole (63) and at least partially extends out of the third through hole (63).

13. The repelling locking device of claim 1, wherein, The repulsion locking device further comprises an upper lead wire (71), and the static contact (42) partially extends out of the vacuum interrupter (1) to form a static contact mounting portion (421), and the upper lead wire (71) is connected with the static contact mounting portion (421) and extends away from the static contact (42).

14. The repelling locking device of claim 1, wherein, The repulsion locking device further comprises a contact spring (73) which drives the moving contact (41) to move towards the static contact (42) so that the moving contact (41) and the static contact (42) are in contact.

15. A vacuum interrupter, characterized by, The repulsion locking device comprises the device according to any one of claims 1-14.

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