A movable contact structure and circuit breaker

Abstract

The embodiment of the utility model provides a kind of movable contact structure and circuit breaker, it is related to low-voltage electrical apparatus technical field.Movable contact structure includes contact support, first movable shaft, second movable shaft, movable contact, first elastic member and second elastic member, the first installation slot of contact support includes first guide slot and first limit slot, second installation slot includes second guide slot and second limit slot;Two ends of first elastic member are connected with first movable shaft and movable contact respectively, two ends of second elastic member are connected with second movable shaft and movable contact respectively;Movable contact rotates under the action of electric repulsion, first movable shaft is moved from first guide slot to first limit slot, second movable shaft is moved from second guide slot to second limit slot;The moving direction of first movable shaft and the extension direction of first elastic member are included angle, the moving direction of second movable shaft and the extension direction of second elastic member are included angle.It can reduce the case of breaking failure, improve the reliability and safety of circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and more specifically, to a moving contact structure and a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of carrying normal operating current and safely interrupting short-circuit current in the event of a short-circuit fault. Under short-circuit conditions, when the circuit breaker performs an interruption operation, the moving contact is subjected to a significant electrodynamic repulsion force under the electromagnetic field generated by the short-circuit current. This electrodynamic repulsion force overcomes the contact pressure between the moving and stationary contacts (mainly provided by the spring reaction force), causing them to separate rapidly and forming an electric arc during the separation process, thereby effectively limiting the short-circuit current.

[0003] However, the existing moving contact structure has the following problems: after being repelled by the stationary contact due to electrodynamic repulsion, it is difficult to achieve stable locking; furthermore, reset is also difficult after locking. This makes the circuit breaker prone to breaking failures, affecting its operational reliability and safety. Utility Model Content

[0004] The purpose of this utility model is to provide a moving contact structure and circuit breaker that can achieve stable locking of the moving contact and is easy to reset, effectively reducing the occurrence of disconnection failures and improving the reliability and safety of circuit breaker operation.

[0005] The embodiments of this utility model are implemented as follows: In a first aspect, this utility model provides a moving contact structure, comprising: A contact support is provided with a first mounting groove and a second mounting groove spaced apart. The first mounting groove includes a first guide groove and a first limiting groove that are connected to each other. The second mounting groove includes a second guide groove and a second limiting groove that are connected to each other. A first movable shaft and a second movable shaft, wherein the first movable shaft is movably disposed in the first guide groove and the second movable shaft is movably disposed in the second guide groove; A moving contact is rotatably mounted on the contact support, and a first cam and a second cam are respectively provided on opposite sides of the moving contact; A first elastic element and a second elastic element, wherein the two ends of the first elastic element are respectively connected to the first movable shaft and the moving contact, and the two ends of the second elastic element are respectively connected to the second movable shaft and the moving contact; The movable contact is used to rotate relative to the contact support under the action of electric repulsion, so that the first cam pushes the first movable shaft to move from the first guide groove to the first limiting groove, and the second cam pushes the second movable shaft to move from the second guide groove to the second limiting groove; the moving direction of the first movable shaft is at an angle to the extending direction of the first elastic member, and the moving direction of the second movable shaft is at an angle to the extending direction of the second elastic member.

[0006] In an optional embodiment, the angle between the moving direction of the first movable shaft and the extending direction of the first elastic member is 45° to 90°.

[0007] In an optional embodiment, the angle between the moving direction of the second movable shaft and the extending direction of the second elastic member is 45° to 90°.

[0008] In an optional embodiment, the first cam, the first guide groove, and the first limiting groove are arranged sequentially along the moving direction of the first movable shaft; and / or, The second cam, the second guide groove, and the second limiting groove are arranged sequentially along the moving direction of the second movable shaft.

[0009] In an optional embodiment, the moving contact structure further includes a limiting member, which is used to abut against the moving contact when the contact support drives the moving contact to rotate.

[0010] In an optional embodiment, a first fixing groove and a second fixing groove are respectively provided on opposite sides of the moving contact. The first fixing groove is located on the side of the first cam away from the first movable shaft, and the second fixing groove is located on the side of the second cam away from the second movable shaft. The end of the first elastic member away from the first movable shaft is disposed in the second fixing groove, and the end of the second elastic member away from the second movable shaft is disposed in the first fixing groove.

[0011] In an optional embodiment, the first cam includes a first pushing surface, a first transition surface, and a first engaging surface connected in sequence, wherein the first pushing surface, the first transition surface, and the first engaging surface are all used to cooperate with the first movable shaft; and / or, The second cam includes a second pushing surface, a second transition surface, and a second engaging surface connected in sequence, all of which are used to cooperate with the second movable shaft.

[0012] In an optional embodiment, the first elastic element and the second elastic element are arranged symmetrically with respect to the rotation center of the moving contact; and / or, The first cam and the second cam are arranged in a centrally symmetrical manner with respect to the rotation center of the moving contact.

[0013] In an optional embodiment, the first guide groove and the second guide groove are centrally symmetrically arranged with respect to the rotation center of the moving contact; and / or, The first limiting groove and the second limiting groove are centrally symmetrical about the rotation center of the moving contact.

[0014] Secondly, this utility model provides a circuit breaker, including the moving contact structure described in any of the foregoing embodiments.

[0015] The beneficial effects of this utility model embodiment include: The moving contact structure has a first movable shaft that moves at an angle to the extension direction of the first elastic element, and a second movable shaft that moves at an angle to the extension direction of the second elastic element. This can be understood as the first and second movable shafts moving within the first and second mounting slots, respectively, not coinciding with the stretching directions of the first and second elastic elements; their directions of movement are different. In other words, the first and second movable shafts do not move vertically. Thus, the elongation by which the first and second movable shafts stretch one end of the first and second elastic elements during movement is less than the elongation by which the spring is stretched when the movable shaft moves along the spring's stretching direction in the prior art. Therefore, the force required to overcome the elastic elements when the first and second movable shafts cross the highest points of the first and second cams is reduced, resulting in relatively smaller forces required to lock or reset the moving contact. This achieves stable locking and easy reset of the moving contact, effectively reducing the occurrence of disconnection failures and improving the reliability and safety of the circuit breaker operation.

[0016] The circuit breaker includes a moving contact structure, which has all the beneficial effects of such a moving contact structure. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the installation of the moving contact structure provided in an embodiment of the present utility model; Figure 2 This is a schematic diagram of the contact support provided in an embodiment of the present utility model; Figure 3 This is a schematic diagram of the structure of the moving contact provided in an embodiment of the present utility model; Figure 4 A schematic diagram of the first repulsion state of the moving contact structure provided in an embodiment of this utility model; Figure 5 A schematic diagram of the second repulsion state of the moving contact structure provided in an embodiment of this utility model; Figure 6 A schematic diagram of the third repulsion state of the moving contact structure provided in the embodiment of this utility model; Figure 7 This is a schematic diagram of the fourth repulsion state of the moving contact structure provided in the embodiment of this utility model.

[0019] Icons: 100 - Moving contact structure; 10 - Contact bracket; 11 - First mounting groove; 111 - First guide groove; 112 - First limiting groove; 12 - Second mounting groove; 121 - Second guide groove; 122 - Second limiting groove; 21 - First movable shaft; 22 - Second movable shaft; 30 - Moving contact; 31 - First cam; 311 - First pushing surface; 312 - First transition surface; 313 - First locking surface; 32 - Second cam; 321 - Second pushing surface; 322 - Second transition surface; 323 - Second locking surface; 33 - First fixing groove; 34 - Second fixing groove; 41 - First elastic element; 42 - Second elastic element; 50 - Limiting element. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "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 when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not 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 utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but can be slightly tilted.

[0025] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] As described in the background art, when a circuit breaker performs a breaking operation, the moving contact is subjected to a significant electrodynamic repulsion force under the electromagnetic field generated by the short-circuit current. This electrodynamic repulsion force overcomes the contact pressure between the moving and stationary contacts, causing them to separate rapidly and forming an electric arc during the separation process, thereby effectively limiting the short-circuit current.

[0027] However, the inventors discovered that in the existing moving contact structure, during the separation process from the stationary contact, the cam of the moving contact pushes the movable shaft to move along the spring's stretching direction. Since the movable shaft needs to pass the highest point of the cam to lock the moving contact, the spring force that needs to be overcome gradually increases (the spring elongation increases with the increase in the moving shaft's height during the repulsion process). When the electric repulsion force cannot overcome the spring force, the moving contact cannot be locked, leading to disconnection failure. Similarly, when the moving contact resets, the movable shaft also needs to overcome a large spring force, which can easily lead to reset failure and disconnection failure, thus affecting the reliability and safety of the circuit breaker.

[0028] Based on this, please refer to Figures 1-7 The present invention provides a moving contact structure 100 and a circuit breaker, which can effectively improve the aforementioned technical problems. Specifically, it can achieve stable locking of the moving contact 30, facilitate reset, effectively reduce the occurrence of breaking failures, and improve the reliability and safety of the circuit breaker operation. The moving contact structure 100 and the circuit breaker will be described in detail below.

[0029] This embodiment provides a circuit breaker (not shown in the figure), which includes a moving contact structure 100. As will be readily apparent to those skilled in the art, the circuit breaker may also include a stationary contact structure and an operating mechanism. The operating mechanism can drive the moving contact structure 100 to move, achieving contact or separation with the stationary contact, thereby realizing the opening and closing operation. Of course, the circuit breaker may also include other components, which will not be elaborated upon in this embodiment.

[0030] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the installation of the moving contact structure 100 provided in this embodiment, combined with... Figure 1 The moving contact structure 100 includes a contact support 10, a first movable shaft 21, a second movable shaft 22, a moving contact 30, a first elastic element 41, and a second elastic element 42. The moving contact 30 is rotatably mounted on the contact support 10. The first movable shaft 21 and the second movable shaft 22 are both movably engaged with the contact support 10. The two ends of the first elastic element 41 are connected to the first movable shaft 21 and the moving contact 30, respectively. The two ends of the second elastic element 42 are connected to the second movable shaft 22 and the moving contact 30, respectively.

[0031] For details, please refer to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the contact support 10 provided in this embodiment. Figure 3 This is a schematic diagram of the moving contact 30 provided in this embodiment. (In conjunction with...) Figures 1-3The contact support 10 is provided with a first mounting groove 11 and a second mounting groove 12 spaced apart. The first mounting groove 11 includes a first guide groove 111 and a first limiting groove 112 that are connected. The second mounting groove 12 includes a second guide groove 121 and a second limiting groove 122 that are connected. A first movable shaft 21 is movably disposed in the first guide groove 111, and a second movable shaft 22 is movably disposed in the second guide groove 121. A first cam 31 and a second cam 32 are respectively provided on opposite sides of the moving contact 30. The first cam 31 is correspondingly disposed with the first movable shaft 21, and the second cam 32 is correspondingly disposed with the second movable shaft 22. The movable contact 30 is used to rotate relative to the contact support 10 under the action of electric repulsion, so that the first cam 31 pushes the first movable shaft 21 to move from the first guide groove 111 to the first limiting groove 112, and causes the second cam 32 to push the second movable shaft 22 to move from the second guide groove 121 to the second limiting groove 122; the moving direction of the first movable shaft 21 is at an angle to the extending direction of the first elastic member 41, and the moving direction of the second movable shaft 22 is at an angle to the extending direction of the second elastic member 42.

[0032] It is easy to understand that the moving direction of the first movable shaft 21 is at an angle to the extending direction of the first elastic member 41, and the moving direction of the second movable shaft 22 is at an angle to the extending direction of the second elastic member 42. This can be understood as the moving directions of the first movable shaft 21 and the second movable shaft 22 within the first mounting groove 11 and the second mounting groove 12, respectively, do not coincide with the stretching directions of the first elastic member 41 and the second elastic member 42. Their movement directions are different; that is, the first movable shaft 21 and the second movable shaft 22 do not move up and down.

[0033] With this configuration, the elongation of one end of the first elastic element 41 and the second elastic element 42 during movement of the first movable shaft 21 and the second movable shaft 22 is less than the elongation of the spring when the movable shaft moves along the spring's stretching direction in the prior art. Therefore, the force required to overcome the elastic elements 41 and 42 when the first movable shaft 21 and the second movable shaft 22 cross the highest points of the first cam 31 and the second cam 32 is reduced. In other words, the force required to overcome when locking or resetting the moving contact 30 is relatively small, thus achieving stable locking and convenient resetting of the moving contact 30. This effectively reduces the occurrence of disconnection failures and improves the reliability and safety of the circuit breaker operation.

[0034] Optionally, the angle θ1 between the moving direction of the first movable shaft 21 and the extending direction of the first elastic element 41 is 45°~90°. For example, θ1 can be 45°, 50°, 60°, 70°, 80°, or 90°, etc. Within this angle range, the elongation of the first elastic element 41 is smaller, and the corresponding elastic force that needs to be overcome is also smaller, which can further reduce the occurrence of disconnection failures and improve the reliability and safety of circuit breaker operation.

[0035] Optionally, the angle θ2 between the moving direction of the second movable shaft 22 and the extending direction of the second elastic element 42 is 45°~90°. For example, θ2 can be 45°, 50°, 60°, 70°, 80°, or 90°, etc. Within this angle range, the elongation of the second elastic element 42 is smaller, corresponding to a smaller elastic force to overcome, which can further reduce the occurrence of breaking failures and improve the reliability and safety of circuit breaker operation.

[0036] It should be noted that when θ1 and θ2 are both 90°, the direction of movement of the first movable shaft 21 is perpendicular to the extension direction of the first elastic element 41, and the direction of movement of the second movable shaft 22 is also perpendicular to the extension direction of the second elastic element 42. In this case, it can be understood that the first movable shaft 21 and the second movable shaft 22 can move left and right, while the first elastic element 41 and the second elastic element 42 can perform up and down stretching movements.

[0037] Please continue to combine Figures 1-3 In this embodiment, the first cam 31, the first guide groove 111, and the first limiting groove 112 are arranged sequentially along the moving direction of the first movable shaft 21, which facilitates the first cam 31 to push the first movable shaft 21 from the first guide groove 111 to the first limiting groove 112, thereby improving the smoothness of the movement of the first movable shaft 21.

[0038] Similarly, in order to improve the smoothness of movement of the second movable shaft 22, in this embodiment, the second cam 32, the second guide groove 121 and the second limiting groove 122 are arranged sequentially along the movement direction of the second movable shaft 22.

[0039] Combination Figure 1 The first elastic element 41 and the second elastic element 42 are centrally symmetrically arranged with respect to the rotation center O of the moving contact 30, which can ensure that the stretching amount of the first elastic element 41 and the second elastic element 42 is basically consistent. At the same time, under the drive of the moving contact 30, the first movable shaft 21 and the second movable shaft 22, the rotation angle of the first elastic element 41 and the second elastic element 42 can also remain basically consistent, thereby improving the rotational stability of the elastic elements and ensuring the reliable operation of the circuit breaker.

[0040] Furthermore, in this embodiment, the first cam 31 and the second cam 32 are centrally symmetrically arranged with respect to the rotation center O of the moving contact 30, which can also improve the rotational stability of the moving contact 30. They can also cooperate with the centrally symmetrical first elastic element 41 and second elastic element 42 to form a parallelogram-like structure when the first cam 31 and the second cam 32 contact the first movable shaft 21 and the second movable shaft 22 respectively. Thus, during the rotation of the moving contact 30, the first elastic element 41 and the second elastic element 42 will not collide or interfere with each other, further ensuring the reliable operation of the circuit breaker. It is easy to understand that the size of this parallelogram structure also changes during the rotation of the moving contact 30 (e.g., ...). Figures 4-7 (As shown).

[0041] Similarly, in order to ensure the stable and reliable operation of the circuit breaker, the first guide groove 111 and the second guide groove 121 are also centrally symmetrically arranged with respect to the rotation center O of the moving contact 30; the first limiting groove 112 and the second limiting groove 122 are also centrally symmetrically arranged with respect to the rotation center O of the moving contact 30.

[0042] Combination Figure 1 and Figure 3 To facilitate the installation of the first elastic element 41 and the second elastic element 42 with the moving contact 30, a first fixing groove 33 and a second fixing groove 34 are respectively provided on opposite sides of the moving contact 30. The first fixing groove 33 is located on the side of the first cam 31 away from the first movable shaft 21, and the second fixing groove 34 is located on the side of the second cam 32 away from the second movable shaft 22. The end of the first elastic element 41 away from the first movable shaft 21 is disposed in the second fixing groove 34, and the end of the second elastic element 42 away from the second movable shaft 22 is disposed in the first fixing groove 33.

[0043] As is easily understood, in this embodiment, the first fixing groove 33 and the second fixing groove 34 are also centrally symmetrically arranged with respect to the rotation center O of the moving contact 30.

[0044] Please continue to combine Figure 1 The moving contact structure 100 also includes a limiting member 50, which is used to abut against the moving contact 30 when the contact support 10 drives the moving contact 30 to rotate.

[0045] It should be noted that after the first movable shaft 21 and the second movable shaft 22 pass the highest points of the first cam 31 and the second cam 32 respectively, that is, after the first movable shaft 21 engages with the first cam 31 and the second movable shaft 22 engages with the second cam 32, the moving contact 30 is locked. To facilitate the reset of the moving contact 30, the contact support 10 can be driven to rotate by the circuit breaker's operating mechanism, thereby causing the moving contact 30 to rotate as well. At this time, one end of the moving contact 30 will collide and abut against the limiting member 50. The limiting member 50 applies a reaction force to the moving contact 30, allowing the moving contact 30 to rotate in the opposite direction. Combined with the elastic force of the first elastic member 41 and the second elastic member 42, it is easier for the first movable shaft 21 and the second movable shaft 22 to pass the highest points of the first cam 31 and the second cam 32 respectively, thereby improving the reliability of the moving contact 30's reset.

[0046] Combination Figure 3 Specifically, the first cam 31 includes a first pushing surface 311, a first transition surface 312, and a first engaging surface 313 connected in sequence, all of which are used to cooperate with the first movable shaft 21. The second cam 32 includes a second pushing surface 321, a second transition surface 322, and a second engaging surface 323 connected in sequence, all of which are used to cooperate with the second movable shaft 22.

[0047] It should be noted that the first transition surface 312 and the second transition surface 322 can be understood as the highest point portions of the first cam 31 and the second cam 32 mentioned above. Furthermore, in this embodiment, both the first transition surface 312 and the second transition surface 322 are arc surfaces, which facilitates the sliding of the first movable shaft 21 and the second movable shaft 22, and is beneficial for realizing the locking and resetting operation of the moving contact 30.

[0048] In addition, it should be noted that the first pushing surface 311, the first engaging surface 313, the second pushing surface 321 and the second engaging surface 323 can all be planes, arc surfaces with equal radii of curvature or arc surfaces with varying radii of curvature, as long as they can achieve the pushing and engaging functions of the first movable shaft 21 and the second movable shaft 22.

[0049] Please refer to Figures 4-7 , Figure 4 This is a schematic diagram of the first repulsion state of the moving contact structure 100 provided in this embodiment. Figure 5 This is a schematic diagram of the second repulsion state of the moving contact structure 100 provided in this embodiment. Figure 6 This is a schematic diagram of the third repulsion state of the moving contact structure 100 provided in this embodiment. Figure 7 This is a schematic diagram of the fourth repulsion state of the moving contact structure 100 provided in this embodiment.

[0050] Combination Figures 4-7 Based on the above, the working principle of the moving contact structure 100 is explained below: First, it should be pointed out that, Figure 1 The diagram shows the installation state of the moving contact structure 100. At this time, the first movable shaft 21 is disposed in the first guide groove 111, and the second movable shaft 22 is disposed in the second guide groove 121. The first pushing surface 311 of the first cam 31 does not contact the first movable shaft 21, and there is a gap between them; the second pushing surface 321 of the second cam 32 also does not contact the second movable shaft 22, and there is a gap between them.

[0051] Next, combined Figure 4 When the electric repulsive force is greater than the elastic force of the first elastic element 41 and the second elastic element 42, the moving contact 30 moves along the electric repulsive force. Figure 4 The rotation in direction A relative to the contact support 10 can also be understood as clockwise rotation; at this time, the first cam 31 and the second cam 32 will also rotate clockwise. During the rotation, the end of the first elastic element 41 connected to the first movable shaft 21 and the end of the second elastic element 42 connected to the second movable shaft 22 remain stationary, while the end of the first elastic element 41 located in the second fixed groove 34 and the end of the second elastic element 42 located in the first fixed groove 33 also rotate clockwise, so that the distance between the first elastic element 41 and the second elastic element 42 gradually decreases until the first pushing surface 311 contacts the first movable shaft 21 and the second pushing surface 321 contacts the second movable shaft 22.

[0052] Combination Figure 5 The moving contact 30 continues to rotate, and the first pushing surface 311 pushes the first movable shaft 21 from the first guide groove 111 to the first limiting groove 112, while the second pushing surface 321 pushes the second movable shaft 22 from the second guide groove 121 to the second limiting groove 122. During this process, the distance between the end of the first elastic element 41 connected to the first movable shaft 21 and the end of the second elastic element 42 located in the first fixed groove 33 gradually increases; the distance between the end of the second elastic element 42 connected to the second movable shaft 22 and the end of the first elastic element 41 located in the second fixed groove 34 gradually increases until the first movable shaft 21 and the second movable shaft 22 contact the first transition surface 312 and the second transition surface 322 respectively. That is, the first elastic element 41 and the second elastic element 42 will not collide or interfere with each other during this process, ensuring operational reliability.

[0053] Combination Figure 6After the first movable shaft 21 and the second movable shaft 22 come into contact with the first transition surface 312 and the second transition surface 322 respectively, the moving contact 30 continues to rotate. When the first movable shaft 21 and the second movable shaft 22 reach the first limiting groove 112 and the second limiting groove 122 respectively, the first movable shaft 21 and the second movable shaft 22 will cross the highest point of the first transition surface 312 and the second transition surface 322 respectively.

[0054] Combination Figure 7 When the first movable shaft 21 and the second movable shaft 22 cross the highest points of the first transition surface 312 and the second transition surface 322 respectively, the first elastic element 41 and the second elastic element 42 are stretched during this process. At this time, under the elastic force of the two elastic elements, the first movable shaft 21 and the second movable shaft 22 will slide onto the first locking surface 313 and the second locking surface 323 respectively. Then, the first movable shaft 21 and the second movable shaft 22 will move towards the first guide groove 111 and the second guide groove 121 respectively until the first elastic element 41 and the second elastic element 42 collide and abut against each other. At this time, since the first movable shaft 21 and the second movable shaft 22 are not in their initial positions, the first movable shaft 21 and the second movable shaft 22 will have a tendency to drive the first elastic element 41 and the second elastic element 42 to move towards the first guide groove 111 and the second guide groove 121 respectively, so that the first elastic element 41 and the second elastic element 42 have a certain bending deformation and store a certain bending elastic potential energy. This is the locking state of the moving contact 30.

[0055] Please continue to combine Figure 7 When the moving contact needs to be reset, the operating mechanism drives the contact support 10 to rotate, causing the moving contact 30 to continue rotating in direction A, i.e., clockwise. When one end of the moving contact 30 collides with the limiting member 50, the moving contact 30 will rotate in direction B, i.e., counterclockwise, under the reaction force of the limiting member 50. At this time, since a certain amount of bending elastic potential energy is stored between the first elastic member 41 and the second elastic member, this elastic potential energy can just increase the torque of the moving contact 30 during the counterclockwise rotation process, thereby further improving the reset reliability of the moving contact 30 and ensuring the safety of the circuit breaker.

[0056] In summary, the embodiments of this utility model provide a moving contact structure 100 and a circuit breaker. The moving contact structure 100 includes a contact support 10, a first movable shaft 21, a second movable shaft 22, a moving contact 30, a first elastic element 41, and a second elastic element 42. The contact support 10 is provided with a first mounting groove 11 and a second mounting groove 12 spaced apart. The first mounting groove 11 includes a first guide groove 111 and a first limiting groove 112 that are connected. The second mounting groove 12 includes a second guide groove 121 and a second limiting groove 122 that are connected. A first movable shaft 21 is movably disposed in the first guide groove 111, and a second movable shaft 22 is movably disposed in the second guide groove 121. A movable contact 30 is rotatably disposed on the contact support 10, and a first cam 31 and a second cam 32 are respectively provided on opposite sides of the movable contact 30. The first cam 31 is correspondingly disposed with the first movable shaft 21, and the second cam 32 is correspondingly disposed with the second movable shaft 22. The two ends of the first elastic member 41 are respectively connected to the first movable shaft 21 and the movable contact 30, and the two ends of the second elastic member 42 are respectively connected to the second movable shaft 22 and the movable contact 30. The movable contact 30 is used to rotate relative to the contact support 10 under the action of electric repulsion, so that the first cam 31 pushes the first movable shaft 21 to move from the first guide groove 111 to the first limiting groove 112, and causes the second cam 32 to push the second movable shaft 22 to move from the second guide groove 121 to the second limiting groove 122; the moving direction of the first movable shaft 21 is at an angle to the extending direction of the first elastic member 41, and the moving direction of the second movable shaft 22 is at an angle to the extending direction of the second elastic member 42.

[0057] Since the moving directions of the first movable shaft 21 and the second movable shaft 22 within the first mounting groove 11 and the second mounting groove 12, respectively, do not coincide with the stretching directions of the first elastic element 41 and the second elastic element 42, their movement directions are different; that is, the first movable shaft 21 and the second movable shaft 22 do not move up and down. Thus, during the movement of the first movable shaft 21 and the second movable shaft 22, the elongation by which one end of the first elastic element 41 and the second elastic element 42 is stretched is less than the elongation by which the spring is stretched when the movable shaft moves along the stretching direction of the spring in the prior art. Therefore, the spring force that needs to be overcome by the first elastic element 41 and the second elastic element 42 when the first movable shaft 21 and the second movable shaft 22 cross the highest point of the first cam 31 and the second cam 32, respectively, can be reduced. This makes the spring force that needs to be overcome when locking or resetting the moving contact 30 relatively small, thereby achieving stable locking and convenient resetting of the moving contact 30, effectively reducing the occurrence of disconnection failures, and improving the reliability and safety of circuit breaker operation.

[0058] The circuit breaker includes a moving contact structure 100, which has all the functions and benefits of the moving contact structure 100.

[0059] The above description is merely a specific embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A moving contact structure, characterized in that, include: The contact support (10) is provided with a first mounting groove (11) and a second mounting groove (12) spaced apart. The first mounting groove (11) includes a first guide groove (111) and a first limiting groove (112) that are connected to each other. The second mounting groove (12) includes a second guide groove (121) and a second limiting groove (122) that are connected to each other. A first movable shaft (21) and a second movable shaft (22), wherein the first movable shaft (21) is movably disposed in the first guide groove (111) and the second movable shaft (22) is movably disposed in the second guide groove (121); The moving contact (30) is rotatably disposed on the contact support (10), and a first cam (31) and a second cam (32) are respectively provided on opposite sides of the moving contact (30). The first elastic element (41) and the second elastic element (42) are respectively connected at both ends of the first elastic element (41) to the first movable shaft (21) and the movable contact (30), and at both ends of the second elastic element (42) to the second movable shaft (22) and the movable contact (30). The movable contact (30) is used to rotate relative to the contact support (10) under the action of electric repulsion, so that the first cam (31) pushes the first movable shaft (21) to move from the first guide groove (111) to the first limiting groove (112), and the second cam (32) pushes the second movable shaft (22) to move from the second guide groove (121) to the second limiting groove (122); the moving direction of the first movable shaft (21) is at an angle to the extending direction of the first elastic member (41), and the moving direction of the second movable shaft (22) is at an angle to the extending direction of the second elastic member (42).

2. The moving contact structure according to claim 1, characterized in that, The angle between the moving direction of the first movable shaft (21) and the extending direction of the first elastic member (41) is 45°~90°.

3. The moving contact structure according to claim 1, characterized in that, The angle between the moving direction of the second movable shaft (22) and the extending direction of the second elastic member (42) is 45°~90°.

4. The moving contact structure according to claim 1, characterized in that, The first cam (31), the first guide groove (111), and the first limiting groove (112) are arranged sequentially along the moving direction of the first movable shaft (21); and / or, The second cam (32), the second guide groove (121) and the second limiting groove (122) are arranged sequentially along the moving direction of the second movable shaft (22).

5. The moving contact structure according to claim 1, characterized in that, The moving contact structure (100) also includes a limiting member (50), which is used to abut against the moving contact (30) when the contact support (10) drives the moving contact (30) to rotate.

6. The moving contact structure according to claim 1, characterized in that, The moving contact (30) is provided with a first fixing groove (33) and a second fixing groove (34) on opposite sides. The first fixing groove (33) is located on the side of the first cam (31) away from the first movable shaft (21), and the second fixing groove (34) is located on the side of the second cam (32) away from the second movable shaft (22). The end of the first elastic member (41) away from the first movable shaft (21) is disposed in the second fixed groove (34), and the end of the second elastic member (42) away from the second movable shaft (22) is disposed in the first fixed groove (33).

7. The moving contact structure according to claim 1, characterized in that, The first cam (31) includes a first pushing surface (311), a first transition surface (312), and a first engaging surface (313) connected in sequence. The first pushing surface (311), the first transition surface (312), and the first engaging surface (313) are all used to cooperate with the first movable shaft (21); and / or, The second cam (32) includes a second pushing surface (321), a second transition surface (322) and a second engaging surface (323) connected in sequence. The second pushing surface (321), the second transition surface (322) and the second engaging surface (323) are all used to cooperate with the second movable shaft (22).

8. The moving contact structure according to claim 1, characterized in that, The first elastic element (41) and the second elastic element (42) are arranged in a centrally symmetrical manner with respect to the rotation center of the moving contact (30); and / or, The first cam (31) and the second cam (32) are centrally symmetrical about the rotation center of the moving contact (30).

9. The moving contact structure according to claim 1, characterized in that, The first guide groove (111) and the second guide groove (121) are centrally symmetrically arranged with respect to the rotation center of the moving contact (30); and / or, The first limiting groove (112) and the second limiting groove (122) are centrally symmetrical about the rotation center of the moving contact (30).

10. A circuit breaker, characterized in that, Includes the moving contact structure (100) as described in any one of claims 1-9.

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