Switching-on holding structure of circuit breaker and circuit breaker

Abstract

The utility model provides a switch-on holding structure of a circuit breaker and the circuit breaker. The switch-on holding structure comprises a first crank arm, a second crank arm, a movable shaft and an elastic reset piece, the first crank arm is used for being connected with an external main shaft to rotate around the main shaft; the first crank arm is provided with a guide hole extending in the direction away from the main shaft. The second crank arm is rotatably connected to the first crank arm; the second crank arm is provided with a movable hole relative to the guide hole; an included angle is formed between the extension direction of the movable hole and the extension direction of the guide hole; the movable shaft can move in the guide hole and the movable hole; the elastic reset piece is connected with the first crank arm and the second crank arm and used for resetting the second crank arm. When the closing holding structure of the circuit breaker moves, the opening latch directly transmits the pressure to the first crank arm through the movable shaft, so that the second crank arm and the rotating joint of the second crank arm and the first crank arm can be effectively prevented from being damaged by stress, and the service life of the closing holding structure is effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of power distribution, in particular to a closing holding structure of a circuit breaker and the circuit breaker. Background Art

[0002] A circuit breaker is a switching device capable of closing, carrying, and disconnecting current under normal and abnormal circuit conditions. It protects circuits from damage caused by overcurrent, overload, or short circuits, preventing safety incidents.

[0003] A circuit breaker consists of a main body and an operating mechanism. The main body is electrically connected to the circuit, enabling it to close, load, and disconnect the circuit. The operating mechanism is connected to the main body. The operating mechanism is a crucial component of AC high-voltage vacuum circuit breakers, and its operational reliability is directly related to the safe operation of the circuit breaker. The operating mechanism can switch between a closed holding position and an open position to control the closing and opening operations of the main body.

[0004] The operating mechanism includes a trip latch, a first crank arm, a second crank arm, and an elastic reset member. The trip latch is used to switch the circuit breaker body between closing and opening. The first crank arm can rotate under the action of an external force. The first crank arm is rotatably connected to the second crank arm. The first crank arm can drive the second crank arm to rotate so as to resist the trip latch. The elastic reset member is connected between the first crank arm and the second crank arm to reset the second crank arm to facilitate the relative rotation of the first crank arm and the second crank arm. When the operating mechanism switches to the closing holding position, the first crank arm drives the second crank arm to rotate, and the elastic reset member resets the second crank arm so that the second crank arm resists and limits the trip latch, thereby completing the closing operation and the operating mechanism is in the closing holding position. When the operating mechanism switches from the closing holding position to the opening position, the first crank arm rotates to separate the second crank arm from the trip latch, and the trip latch rotates to open the circuit breaker body and disconnect the circuit.

[0005] However, when the operating mechanism switches between the closed and open positions, the first crank arm drives the second crank arm to rotate. As the first and second crank arms move, the opening latch and elastic return member exert a strong impact force on the second crank arm and the pivoting connection between the second crank arm and the first crank arm, potentially damaging them and posing a safety hazard. Utility Model Content

[0006] The purpose of the present application is to provide a circuit breaker closing holding structure and a circuit breaker that can effectively ensure the connection strength and safety performance of the operating mechanism and extend the service life of the circuit breaker.

[0007] To solve the above technical problems, this application adopts the following technical solutions:

[0008] According to one aspect of the present application, the present application provides a closing holding structure of a circuit breaker, which is used to resist and limit the opening latch, and includes: a first crank arm, a second crank arm, a movable shaft and an elastic reset member; the first crank arm is used to connect to an external main shaft to rotate around the main shaft; the first crank arm includes two first arm plates connected to each other, the two first arm plates are arranged at intervals, and the two first arm plates are each provided with a guide hole, and the guide hole extends in a direction away from the main shaft; the second crank arm is rotatably connected to the first crank arm and is located between the two first arm plates, and the rotation axis of the second crank arm is parallel to the rotation axis of the main shaft; the second crank arm is provided with a movable hole relative to the guide hole; the extension direction of the movable hole is equal to the extension direction of the guide hole. There is an angle between them; the movable shaft is used to support and limit the opening latch; the movable shaft can move in the guide hole so as to be able to switch between the initial position and the avoidance position; the movable shaft can also move in the movable hole; the elastic reset member connects the first crank arm and the second crank arm to reset the second crank arm; wherein, when the movable shaft moves from the initial position to the avoidance position, the movable shaft can support the inner wall of the movable hole to drive the second crank arm to rotate, and the elastic reset member absorbs kinetic energy; when the second crank arm passes over the opening latch, the elastic reset member releases kinetic energy to make the second crank arm rotate, and the inner wall of the movable hole drives the movable shaft to move from the avoidance position to the initial position in the guide hole.

[0009] In some embodiments, the guide hole is arc-shaped.

[0010] In some embodiments, when the second crank arm passes over the trip latch and the movable shaft is in the initial position, the protruding direction of the guide hole is toward the trip latch, and the rotation axis of the second crank arm is located on the concave side of the guide hole. The arc-shaped inner wall of the guide hole away from the trip latch will limit the movable shaft so that the movable shaft is in a locked state.

[0011] In some embodiments, the movable hole is in a straight line or arc shape.

[0012] In some embodiments, the first crank arm further includes a rotating shaft, which extends along the extension direction of the movable shaft; both ends of the rotating shaft are connected to the two first arm plates; and the second crank arm is rotatably mounted on the rotating shaft.

[0013] In some embodiments, the second crank arm includes two second arm plates connected to each other, and the two second arm plates are arranged at intervals along the arrangement direction of the two first arm plates; the two second arm plates are each provided with the movable hole; the movable shaft includes a coaxially arranged supporting portion and two movable portions, and the supporting portion is located between the two second arm plates; in a plane perpendicular to the axis of the movable shaft, the diameter of the supporting portion is greater than the width of the movable hole; the two movable portions are located at both ends of the supporting portion, and the movable portions pass through the movable hole and the guide hole in sequence.

[0014] In some embodiments, the first crank arm further includes a connecting member, which extends along the arrangement direction of the two first arm plates, and whose two ends are respectively connected to the two first arm plates, and the connecting member is located on the outside of the second crank arm.

[0015] In some embodiments, the second crank arm further includes a limiting wheel, the limiting wheel extending along the arrangement direction of the two second arm plates; the limiting wheel is rotatably disposed between the two second arm plates;

[0016] The elastic return member includes a torsion spring body sleeved on the rotating shaft, and two extensions extending from both ends of the torsion spring body; the two extensions are respectively limited on the limiting wheel and one of the connecting members, and the torsion spring body releases kinetic energy so as to apply elastic force to the second crank arm through the limiting wheel.

[0017] In some embodiments, the second crank arm also includes a limiting shaft, which extends along the arrangement direction of the two second arm plates, and the two ends of the limiting shaft respectively pass through the two second arm plates. The limiting shaft is used to pass through the limiting wheel so that the limiting wheel can rotate around the limiting shaft; the limiting shaft is located on the outside of the first crank arm, and the two ends of the limiting shaft can respectively support the outer walls of the two first arm plates.

[0018] A circuit breaker comprises: a circuit breaker body and an operating mechanism; the circuit breaker body is used to communicate with an external circuit; the operating mechanism comprises: a trip latch and a closing holding structure of the circuit breaker as described above; the trip latch is transmission-connected to the circuit breaker body; the trip latch is capable of switching between a closing holding position and an opening position, so that the closing and opening of the circuit breaker body can be controlled by the trip latch; the closing holding structure is capable of supporting and limiting the trip latch, so that the trip latch is limited to the closing holding position.

[0019] It can be seen from the above technical solution that this application has at least the following advantages and positive effects:

[0020] In the present application, when the circuit breaker is closed, the main shaft drives the first crank arm to rotate so that the movable shaft abuts the side wall of the trip latch. The movable shaft moves from an initial position to a relief position within the guide hole, and the movable shaft pushes the second crank arm to rotate. The second crank arm applies force to the elastic reset member, so that the elastic reset member absorbs kinetic energy and converts it into elastic potential energy. After the second crank arm passes over the trip latch and moves to the lower side of the trip latch, the first crank arm rotates in the opposite direction under the action of the main shaft. The elastic reset member converts the elastic potential energy into elastic force, causing the second crank arm to rotate in the opposite direction. The second crank arm drives the movable shaft from the relief position to the initial position, so that the movable shaft abuts the lower end of the trip latch when the first crank arm rotates in the opposite direction, thereby limiting the trip latch and limiting the trip latch to the closed state. When the circuit breaker's closing retention structure is moving, the trip latch transmits pressure directly to the first crank arm through the movable shaft, thereby effectively preventing the second crank arm and the rotational connection between the second crank arm and the first crank arm from being damaged by force, effectively extending the service life of the closing retention structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of the opening latch, closing holding structure and main shaft of this application.

[0022] Figure 2 It is a structural diagram of the closing holding structure of this application.

[0023] Figure 3 yes Figure 3 Schematic diagram of the structure after removing a first arm plate of the structure shown in.

[0024] Figure 4 It is a structural diagram of the second crank arm of this application.

[0025] The description of the accompanying drawings is as follows: 110, tripping latch; 120, main shaft; 121, limiting protrusion; 200, first crank arm; 210, first arm plate; 211, guide hole; 220, connecting piece; 230, rotating shaft; 240, rolling wheel; 250, main shaft hole; 251, limiting groove; 300, second crank arm; 310, second arm plate; 311, movable hole; 321, limiting shaft; 322, limiting wheel; 400, movable shaft; 410, supporting portion; 420, movable portion; 500, elastic reset member; 510, torsion spring body; 520, extension portion. DETAILED DESCRIPTION

[0026] Typical embodiments that embody the features and advantages of the present application will be described in detail in the following description. It should be understood that the present application can have various variations in different embodiments without departing from the scope of the present application, and the descriptions and illustrations therein are essentially for illustrative purposes and are not intended to limit the present application.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0028] The circuit breaker can be closed to connect the circuit and opened to disconnect the circuit.

[0029] A circuit breaker may include a circuit breaker body and an operating mechanism. The circuit breaker body is electrically connected to the circuit, enabling it to close, load, and disconnect the circuit. The operating mechanism is connected to the circuit breaker body. The operating mechanism is a crucial component of the circuit breaker, and its operational reliability is directly related to the safe operation of the circuit breaker. The operating mechanism can switch between a closed holding position and an open position to control the closing and opening of the circuit breaker body.

[0030] The operating mechanism may include: a tripping latch, a closing retention structure, and a main shaft. The tripping latch is in transmission connection with the circuit breaker body. The tripping latch can rotate around itself to switch between a closed retention position and an open position, thereby controlling the closing and opening of the circuit breaker body. The closing retention structure can abut and limit the tripping latch, so that the tripping latch is fixed in the closed retention position. The main shaft is in transmission connection with the closing retention structure to drive the closing retention structure to achieve the switching of the operating mechanism between the closed retention position and the open position.

[0031] Figure 1 This is a structural diagram of the opening latch, closing holding structure and main shaft of this application. Figure 2 It is a structural diagram of the closing holding structure of this application.

[0032] See Figure 1 and Figure 2The present application provides a circuit breaker closing retention structure for supporting and limiting the opening latch 110. The closing retention structure may include: a first crank arm 200, a second crank arm 300, a movable shaft 400, and an elastic return member 500. The first crank arm 200 is used to connect to the external main shaft 120 for rotation around the main shaft 120. The first crank arm 200 may include two first arm plates 210 connected to each other, with the two first arm plates 210 arranged at an interval. Both first arm plates 210 may be provided with a guide hole 211 extending away from the main shaft 120. The second crank arm 300 is rotatably connected to the first crank arm 200 and is located between the two first arm plates 210. The rotation axis of the second crank arm 300 is parallel to the rotation axis of the main shaft 120. The second crank arm 300 may be provided with a movable hole 311 relative to the guide hole 211, and the extension direction of the movable hole 311 is at an angle to the extension direction of the guide hole 211. The movable shaft 400 is used to abut and limit the tripping latch 110. The movable shaft 400 can move within the guide hole 211 to switch between an initial position and a relief position; the movable shaft 400 can also move within the movable hole 311. The elastic return member 500 can connect the first crank arm 200 and the second crank arm 300 to absorb kinetic energy during the rotation of the second crank arm 300, thereby resetting the second crank arm 300. When the movable shaft 400 moves from the initial position to the relief position, the movable shaft 400 abuts against the inner wall of the movable hole 311 to drive the second crank arm 300 to rotate, and the elastic return member 500 absorbs the kinetic energy. When the second crank arm 300 passes over the tripping latch 110, the elastic return member 500 releases kinetic energy to apply an elastic force to the second crank arm 300, causing the second crank arm 300 to rotate. The inner wall of the movable hole 311 drives the movable shaft 400 from the relief position to the initial position within the guide hole 211.

[0033] When the circuit breaker is closed, the main shaft 120 rotates, driving the first crank arm 200 to rotate about the rotation axis of the main shaft 120 toward the tripping latch 110. When the closing retention structure contacts the tripping latch 110, the first crank arm 200 continues to rotate, the movable shaft 400 contacts the tripping latch 110, and the tripping latch 110 applies pressure to the movable shaft 400, causing the movable shaft 400 to move from the initial position to the avoidance position within the guide hole 211. When the movable shaft 400 moves from the initial position to the avoidance position, the movable shaft 400 abuts against the inner wall of the movable hole 311 to drive the second crank arm 300 to rotate, thereby causing the movable shaft 400 and the second crank arm 300 to avoid the tripping latch 110, allowing the closing retention structure to pass over the tripping latch 110. When the second crank arm 300 rotates, part of the kinetic energy is converted into elastic potential energy of the elastic reset member 500.

[0034] After the closing retention structure passes over the opening latch 110, the main shaft 120 drives the first crank arm 200 to rotate. The elastic return member 500 applies an elastic force to the second crank arm 300, causing the second crank arm 300 to drive the movable shaft 400 to move. The movable shaft 400 moves from the avoidance position to the initial position. When the movable shaft 400 moves to the initial position, the first crank arm 200 rotates to cause the movable shaft 400 to abut against the opening latch 110, thereby limiting the rotation of the opening latch 110 and limiting the opening latch 110 to the closing retention position.

[0035] See Figure 1 For ease of understanding and description, the state of the closing holding structure when it is in the closing holding position is used as a reference, the direction of the opening latch relative to the closing holding structure is referred to as the upper part below, and the direction away from the upper part is referred to as the lower part below; the direction of the rotation axis of the main shaft is referred to as the front-to-back direction below, and the direction perpendicular to the up-down direction and the front-to-back direction is referred to as the left-to-right direction below.

[0036] When the closing retention structure rotates toward the opening latch 110 and the movable shaft 400 moves from its initial position to the avoidance position, the first crank arm 200 rotates in the forward direction. After the closing retention structure passes over the opening latch 110, the movable shaft 400 moves to its initial position under the action of the elastic return member 500. When the closing retention structure rotates toward the opening latch 110, causing the movable shaft 400 to abut and retain the opening latch 110, the first crank arm 200 rotates in the reverse direction.

[0037] Figure 3 yes Figure 3 Schematic diagram of the structure after removing a first arm plate of the structure shown in.

[0038] See Figures 1 to 3 In this embodiment, the first crank arm 200 is in transmission connection with the main shaft 120, enabling rotation driven by the main shaft 120 and driving the second crank arm 300 to rotate. The first crank arm 200 may include two interconnected first arm plates 210. The first arm plates 210 extend in the left-right direction. The two first arm plates 210 are spaced apart in the front-to-back direction. The two first arm plates 210 are clamped on the front and rear sides of the second crank arm 300 to enhance the structural strength and reliability of the closing retention mechanism.

[0039] See Figures 1 to 3In this embodiment, the first crank arm 200 further includes a connector 220. The connector 220 extends along the arrangement of the two first arm plates 210, with its ends connecting the two first arm plates 210. The connector 220 ensures a tight connection between the two first arm plates 210, thereby improving the connection strength and load-bearing capacity of the two first arm plates 210 and extending the service life of the closing retention structure. The connector 220 is located outside the second crank arm 300 to avoid the second crank arm 300 and facilitate its rotation.

[0040] In some embodiments, there may be a plurality of connectors 220. The plurality of connectors 220 are arranged at intervals to improve the structural strength and load-bearing capacity of the first crank arm 200. In other embodiments, there may be at least two connectors 220.

[0041] In some embodiments, the connecting member 220 may be located between the main shaft hole 250 and the guide hole 211. The connecting member 220 may be positioned relative to one end of the elastic return member 500, thereby facilitating the elastic return member 500 to absorb and release kinetic energy.

[0042] In some embodiments, the connector 220 may include a supporting portion and two connecting portions. The supporting portion extends in the front-to-back direction. The two end walls of the supporting portion may abut against the facing side walls of the two first arm plates 210 to support the two first arm plates 210, prevent the two first arm plates 210 from moving toward each other, and improve the structural strength and stability of the first crank arm 200. The two connecting portions are respectively provided at both ends of the supporting portion, and the connecting portions extend in the front-to-back direction. The two connecting portions are respectively passed through and limited to the two first arm plates 210 to facilitate the assembly of the first crank arm 200, improve the installation efficiency of the closing holding structure, and also improve the connection strength between the two arm plates and improve the impact resistance of the closing holding structure.

[0043] In other embodiments, in a plane perpendicular to the front-rear direction, the cross-sectional area of ​​the connecting portion is smaller than the cross-sectional area of ​​the supporting portion, so that the supporting portion can abut against and support the two first arm plates 210 .

[0044] In other embodiments, the connecting portion and the supporting portion are coaxially arranged.

[0045] See Figures 1 to 3 In this embodiment, the first crank arm 200 may further include a rotation shaft 230. The rotation shaft 230 extends along the extension direction of the movable shaft 400. The ends of the rotation shaft 230 are connected to the two first arm plates 210 to enhance the structural strength of the first crank arm 200. The second crank arm 300 is rotatably mounted on the rotation shaft 230 to facilitate rotation of the second crank arm 300.

[0046] In some embodiments, the rotating shaft 230 may be located at an end of the first arm plate 210 away from the main shaft hole 250 , so that the second crank arm 300 can avoid the main shaft 120 when rotating, thereby improving the safety and stability of the closing holding structure.

[0047] In other embodiments, the rotating shaft 230 and the at least two connecting members 220 are distributed in a triangular shape, so as to further improve the structural strength and load-bearing capacity of the first crank arm 200 .

[0048] In some embodiments, a main shaft hole 250 is formed at one end of each of the two first arm plates 210 away from the guide hole 211 . The main shaft hole 250 is used to accommodate and limit the main shaft 120 so that the main shaft 120 can drive the first crank arm 200 to rotate.

[0049] In other embodiments, the first arm plate 210 is provided with a retaining groove 251 on the inner wall of the spindle hole 250 to facilitate engagement with the spindle 120. A retaining bump 121 is provided on the outer peripheral wall of the spindle 120. The retaining groove 251 on the first arm plate 210 mates with the retaining bump 121 on the spindle 120 to enhance the connection strength between the first arm plate 210 and the spindle 120, thereby facilitating stable and reliable transmission of force from the spindle 120 to the first arm plate 210.

[0050] In other embodiments, the main shaft 120 and the first arm plate 210 may be connected by threaded connection, welding, etc., so that the main shaft 120 can drive the first crank arm 200 to rotate accurately and stably.

[0051] See Figures 1 to 3 In this embodiment, a guide hole 211 is formed at the same end away from the two first arm plates 210. The guide hole 211 is used to guide and support the movable shaft 400, so that the force applied to the movable shaft 400 can be directly transmitted to the first arm plate 210 through the inner wall of the guide hole 211, thereby improving the structural strength and bearing capacity of the closing holding structure and extending the service life of the closing holding structure.

[0052] When the main shaft 120 drives the first crank arm 200 to rotate forward, the end of the first crank arm 200 away from the main shaft 120 rotates toward the tripping latch 110, so that the movable shaft 400 approaches and abuts against the tripping latch 110. When the first crank arm 200 continues to rotate forward, the tripping latch 110 squeezes the movable shaft 400, so that the movable shaft 400 moves from the initial position to the avoidance position in the guide hole 211. During the movement of the movable shaft 400, the elastic reset member 500 absorbs kinetic energy, and the squeezing force of the tripping latch 110 on the movable shaft 400 is directly transmitted to the first arm plate 210 through the inner wall of the guide hole 211. Since the squeezing force does not need to pass through the second crank arm 300, it can effectively prevent fatigue fracture of the second crank arm 300 and extend the service life of the closing holding structure.

[0053] When the main shaft 120 drives the first crank arm 200 to rotate forward to pass the tripping latch 110, the movable shaft 400 moves to a clearance position within the guide hole 211. As the first crank arm 200 continues to rotate forward to move away from the tripping latch 110, the tripping latch 110 separates from the movable shaft 400. The elastic return element 500 converts elastic potential energy into kinetic energy, exerting an elastic force on the second crank arm 300. The elastic force causes the second crank arm 300 to rotate, driving the movable shaft 400 from the clearance position to its initial position.

[0054] After the main shaft 120 drives the first crank arm 200 to pass over the tripping latch 110, the movable shaft 400 moves to the initial position under the action of the elastic reset member 500, and the main shaft 120 drives the first crank arm 200 to reverse so that the movable shaft 400 is held against the lower end of the tripping latch 110, thereby limiting the tripping latch 110 so that the tripping latch 110 remains in the closing holding position.

[0055] Compared with the traditional closing holding structure, the closing holding structure of the present application can drive the movable shaft 400 to move by rotating the first crank arm 200, so as to effectively reduce the torque of the movable shaft 400 relative to the main shaft 120 when moving, thereby reducing the moving speed of the movable shaft 400 in the movable hole 311, so that the relative movement between the first crank arm 200 and the second crank arm 300 can be achieved only through the movable hole 311 of a smaller length. The smaller size of the movable hole 311 can further improve the structural strength and bearing capacity of the second arm plate 310, thereby extending the service life of the closing holding structure.

[0056] See Figures 1 to 3 In this embodiment, the guide hole 211 can extend in an arc shape so that when the second crank arm 300 rotates around the rotating shaft 230, the movable shaft 400 can move in the guide hole 211 and can move in the movable hole 311 relative to the second crank arm 300.

[0057] In some embodiments, when the second crank arm 300 passes over the trip latch 110 and the movable shaft 400 is in the initial position, the protruding direction of the guide hole 211 is toward the trip latch 110, and the rotation axis of the second crank arm 300 is located on the concave side of the guide hole 211. The curved inner wall of the guide hole 211 away from the trip latch 110 will limit the movable shaft 400 so that the movable shaft 400 is in a locked state.

[0058] When the main shaft 120 drives the first crank arm 200 to reverse, the movable shaft 400 is pressed against the lower end of the trip latch 110 and exerts downward pressure on the movable shaft 400. After the movable shaft 400 is subjected to pressure, the arc-shaped inner wall of the end of the guide hole 211 away from the main shaft 120 and the arc-shaped inner wall in the middle of the guide hole 211 respectively limit the movable shaft 400 to prevent the movable shaft 400 from moving in the left and right directions, so that the movable shaft 400 is limited and locked at one end of the guide hole 211, thereby ensuring the stability and reliability of the movable shaft 400 and improving the stability between the closing holding structure and the trip latch 110.

[0059] In some embodiments, an end portion of the guide hole 211 away from the main shaft 120 is located at the lower side of the middle portion of the guide hole 211 to improve the stability and reliability of the movable shaft 400 and the tripping latch 110 when they are mutually limited.

[0060] In other embodiments, one end of the guide hole 211 away from the main shaft 120 is located on the lower side of the other parts of the guide hole 211, so that when the movable shaft 400 and the tripping latch 110 limit each other, the inner wall of the guide hole 211 can limit the movement of the movable shaft 400, thereby preventing the movable shaft 400 from moving in the guide hole after being subjected to the pressure of the tripping latch, effectively improving the limiting stability and reliability of the closing holding structure and the tripping latch 110.

[0061] See Figures 1 to 3 In this embodiment, the first crank arm 200 may further include a rolling wheel 240 . The rolling wheel 240 is rotatably connected to the two first arm plates 210 , and the rolling wheel 240 is located on a side of the main shaft hole 250 away from the guide hole 211 .

[0062] Figure 4 It is a structural diagram of the second crank arm of this application.

[0063] See Figures 1 to 4 In this embodiment, the closing holding structure may further include a second crank arm 300 .

[0064] The second crank arm 300 is located between the two first arm plates 210 and is rotatably mounted on the rotating shaft 230 .

[0065] The second crank arm 300 is used to reset the movable shaft 400, thereby realizing the cyclic operation of the circuit breaker.

[0066] The second crank arm 300 may include two interconnected second arm plates 310. The second arm plates 310 extend in the vertical direction. The two second arm plates 310 are spaced apart in the front-to-back direction. The two second arm plates 310 are both mounted on the rotation shaft 230 so as to be rotatable about the rotation shaft 230.

[0067] Each second arm plate 310 defines a movable hole 311 extending vertically relative to the guide hole 211. Adjacent movable holes 311 and guide holes 211 are provided at both ends of the movable shaft 400. This allows the movable shaft 400 to rotate within the movable holes 311 and guide holes 211, respectively, as the second crank arm 300 rotates about the rotation axis 230. This allows the second crank arm 300 to rotate relative to the first crank arm 200, ensuring stable and reliable movement of the movable shaft 400 and enhancing the safety and stability of the closing retention mechanism.

[0068] See Figures 1 to 4 In this embodiment, the movable hole 311 is linear or arc-shaped. The movable hole 311 extends along the extension direction of the second arm plate 310. This allows the movable shaft 400 to move up and down within the movable hole 311 when the second crank arm 300 rotates about the rotation axis 230. This allows the movable shaft 400 to move within the guide hole 211, preventing the first crank arm 200 from affecting the rotation of the second crank arm 300.

[0069] In this embodiment, the second crank arm 300 may further include a limiting wheel 322 extending along the arrangement direction of the two second arm plates 310. The limiting wheel 322 is rotatably disposed between the two second arm plates 310. The limiting wheel 322 and the elastic limiting member are mutually limited to cooperate with the connecting member 220, thereby enabling the elastic return member 500 to absorb kinetic energy during the rotation of the second crank arm 300 and release the kinetic energy to drive the second crank arm 300 to rotate.

[0070] The second crank arm 300 may further include a limiting shaft 321 extending along the arrangement direction of the two second arm plates 310. The limiting shaft 321 has two ends extending through the two second arm plates 310 to facilitate synchronous rotation of the two second arm plates 310. The limiting shaft 321 is used to pass through a limiting wheel 322 to enable the limiting wheel 322 to rotate about the limiting shaft 321.

[0071] In some embodiments, the limiting shaft 321 can be located on the outside of the first crank arm 200 so that the two ends of the limiting shaft 321 can respectively abut against the outer peripheral walls of the two first arm plates 210. The limiting shaft 321 can abut against the outer peripheral walls of the first arm plates 210 to limit the rotation of the second crank arm 300 and prevent the second crank arm 300 from rotating excessively and causing the movable shaft 400 to squeeze the inner wall of the guide hole 211, thereby preventing the first crank arm 200, the second crank arm 300 and the movable shaft 400 from being damaged, thereby extending the service life of the closing holding structure.

[0072] In some embodiments, the second arm plate 310 can be arc-shaped, straight-line-shaped or other irregular shapes, so that the second arm plate 310 can rotate around the rotating shaft 230, and can open a movable hole 311 relative to the guide hole 211, so that the rotation of the second arm plate 310 can push the movable shaft 400 to move.

[0073] The arrangement of the second arm plate 310, the rotating shaft 230 and the movable shaft 400 can effectively reduce the rotation angle of the second crank arm 300, so that the second crank arm 300 can pass over the tripping latch 110 with only a small torque, and can realize the limiting of the tripping latch 110 by the closing holding structure, thereby effectively reducing the driving force of the main shaft 120 on the closing holding structure, improving the working efficiency of the closing holding structure, improving the working efficiency of the circuit breaker, effectively avoiding the safety hazards caused by fatigue fracture of the second crank arm 300, the rotating shaft 230 and the movable shaft 400, and extending the service life of the closing holding structure.

[0074] Moreover, the structure of the first crank arm 200, the second crank arm 300 and the movable shaft 400 can simplify the structural design of the closing holding structure while realizing the functional role of the closing holding structure, thereby reducing the installation production process and reducing the production cost of the closing holding structure.

[0075] See Figures 1 to 4 In this embodiment, the movable shaft 400 is inserted into the movable hole 311 of the second arm plate 310 and the guide hole 211 of the first arm plate 210. The movable shaft 400 can move within the guide hole 211 to switch between the initial position and the avoidance position. It can also move up and down within the movable hole 311, thereby preventing the first crank arm 200, the movable shaft 400, and the second crank arm 300 from locking with each other, ensuring stable and reliable operation of the closing and holding structure.

[0076] The movable shaft 400 may include a coaxially arranged abutting portion 410 and two movable portions 420. The abutting portion 410 is located between the two second arm plates 310. In a plane perpendicular to the axis of the movable shaft 400, the diameter of the abutting portion 410 is greater than the width of the movable hole 311. The two movable portions 420 are located at both ends of the abutting portion 410 and pass through the movable hole 311 and the guide hole 211, respectively.

[0077] The supporting portion 410 can support the side wall of the trip latch 110 so that it can move in the guide hole 211 and the movable hole 311 under the pressure of the trip latch 110, and the supporting portion 410 can also support the lower end of the trip latch 110 to limit the limit trip latch 110 to the closing holding position.

[0078] In the related art, the structure of the short circuit breaker is relatively complex. In order to improve the space utilization of the circuit breaker and reduce the volume of the circuit breaker, the closing holding structure requires the internal parts to be relatively small. However, the small size of the parts will make the closing holding structure prone to fatigue fracture. The closing holding structure of the structure of the present application effectively reduces the number of parts while ensuring the function. On the one hand, while maintaining the same volume, it can effectively increase the shaft diameter of parts such as the movable shaft 400, thereby effectively improving the strength and service life of the closing holding structure. On the other hand, it can reduce the number of moving pairs, improve the rotation accuracy of the closing holding structure, reduce failures, and improve reliability.

[0079] See Figures 1 to 4 In this embodiment, the elastic return member 500 is used to elastically connect the first crank arm 200 and the second crank arm 300, so as to absorb and store the kinetic energy applied by the movable shaft 400 to the second crank arm 300 when the first crank arm 200 rotates forward, and can also release the elastic force to drive the second crank arm 300 to rotate, thereby improving the energy utilization efficiency of the closing holding structure.

[0080] The elastic return member 500 may be a torsion spring. The elastic return member 500 may include a torsion spring body 510 sleeved around the rotating shaft 230 and two extensions 520 extending from both ends of the torsion spring body 510. The two extensions 520 are respectively restrained by the limiting wheel 322 and a connecting member 220. The torsion spring body 510 releases kinetic energy to apply an elastic force to the second crank arm 300 through the limiting wheel 322.

[0081] Compared with the traditional tension spring, the setting of the torsion spring body 510 and the two extension parts 520 can adapt to the small angle rotation of the second crank arm 300, and can also avoid the problem of breakage of the hook of the traditional tension spring, reducing the processing difficulty of the elastic return member 500.

[0082] In some embodiments, the two extensions 520 abut against opposite sides of the limiting wheel 322 and the connecting member 220, respectively. When the first crank arm 200 rotates forward, the tripping latch 110 presses against the movable shaft 400, causing the movable shaft 400 to move from its initial position toward the avoidance position. The movable shaft 400 drives the second crank arm 300 to rotate reversely, increasing the distance between the limiting wheel 322 and the connecting member 220. The torsion spring body 510 absorbs kinetic energy and converts it into elastic potential energy. When the first crank arm 200 passes over the tripping latch 110, the torsion spring body 510 releases the elastic potential energy and converts it into elastic force. The two extensions 520 move toward each other, bringing the limiting wheel 322 and the connecting member 220 closer together. The second crank arm 300 rotates forward, thereby driving the movable member to move from the avoidance position to the initial position.

[0083] See Figures 1 to 4In the present application, when the user closes the switch, the main shaft 120 drives the first crank arm 200 to rotate forward, and the first crank arm 200 approaches the trip latch 110, so that the movable shaft 400 abuts against the side wall of the trip latch 110. When the first crank arm 200 continues to rotate forward and the trip latch 110 squeezes the movable shaft 400, the movable shaft 400 moves from the initial position to the avoidance position in the guide hole 211. During the movement of the movable shaft 400, the movable shaft 400 moves up and down in the movable hole 311 and abuts against a side wall of the movable shaft 400 in the left and right directions, thereby driving the second crank arm 300 to reverse. When the second crank arm 300 reverses, the elastic return member 500 will absorb part of the kinetic energy of the second crank arm 300 and convert it into elastic potential energy.

[0084] When the main shaft 120 drives the first crank arm 200 past the tripping latch 110, the movable shaft 400 separates from the tripping latch 110. The elastic return member 500 releases its elastic potential energy and applies an elastic force to the second crank arm 300. Under the action of the elastic force, the second crank arm 300 rotates forward, driving the movable shaft 400 from the avoidance position to its initial position. The main shaft 120 then drives the first crank arm 200 in a counter-rotating direction, forcing the movable shaft 400 to abut against the tripping latch 110, thereby securing the tripping latch 110 in the closed holding position and completing the closing operation.

[0085] During the above-mentioned movement process, the pressure generated by the trip latch 110 on the movable shaft 400 is directly transmitted to the first crank arm 200, thereby effectively avoiding damage to the connection between the movable shaft 400 and the second crank arm 300, the second crank arm 300, and the rotating shaft 230, thereby effectively extending the service life of the closing holding structure.

[0086] See Figures 1 to 4 The present application also provides a circuit breaker, which includes: a circuit breaker body and an operating mechanism. The circuit breaker body is used to communicate with an external circuit. The operating mechanism may include: a trip latch 110 and a closing holding structure of the circuit breaker. The trip latch 110 is transmission-connected to the circuit breaker body. The trip latch 110 can switch between a closing holding position and an opening position, so that the closing and opening of the circuit breaker body can be controlled by the trip latch 110. The closing holding structure can support and limit the trip latch 110, so that the trip latch 110 is limited to the closing holding position.

[0087] When the circuit breaker is closed, the user pushes the first crank arm 200 to rotate through the main shaft 120, so that the trip latch 110 squeezes the movable shaft 400, and the movable shaft 400 moves from the initial position to the avoidance position. The second crank arm 300 reverses around the rotating shaft 230 and squeezes the elastic reset member 500.

[0088] After the first crank arm 200 passes the tripping latch 110, the elastic reset member 500 pushes the second crank arm 300 to rotate forward, causing the second crank arm 300 to drive the movable shaft 400 from the avoidance position to the initial position. Finally, the main shaft 120 drives the first crank arm 200 to rotate reversely, causing the movable shaft 400 to abut against the lower end of the tripping latch 110, thereby limiting the tripping latch 110 to the closed holding position and closing the circuit breaker.

[0089] Although the present application has been described with reference to several exemplary embodiments, it should be understood that the terms used are illustrative and exemplary rather than restrictive. Since the present application can be embodied in various forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all changes and modifications that fall within the scope of the claims or their equivalents are intended to be covered by the appended claims.

Claims

1. A closing holding structure of a circuit breaker, which is used to hold and limit the opening latch, characterized in that: include: A first crank arm, which is used to connect to an external main shaft to rotate around the main shaft; the first crank arm includes two first arm plates connected to each other, the two first arm plates are arranged at an interval, and the two first arm plates are each provided with a guide hole, the guide hole extending in a direction away from the main shaft; a second crank arm rotatably connected to the first crank arm and located between the two first arm plates, wherein the rotation axis of the second crank arm is parallel to the rotation axis of the main shaft; a movable hole is formed on the second crank arm relative to the guide hole; an extension direction of the movable hole forms an angle with an extension direction of the guide hole; A movable shaft, which is used to resist and limit the opening latch; the movable shaft can move in the guide hole to switch between the initial position and the avoidance position; the movable shaft can also move in the movable hole; an elastic reset member, connecting the first crank arm and the second crank arm, for resetting the second crank arm; In which, when the movable shaft moves from the initial position to the avoidance position, the movable shaft can abut against the inner wall of the movable hole to drive the second crank arm to rotate, and the elastic reset component absorbs kinetic energy; when the second crank arm passes over the trip latch, the elastic reset component releases kinetic energy to make the second crank arm rotate, and the inner wall of the movable hole drives the movable shaft to move from the avoidance position to the initial position in the guide hole.

2. The closing holding structure of the circuit breaker according to claim 1, characterized in that: The guide hole is in an arc shape.

3. The closing holding structure of the circuit breaker according to claim 2, characterized in that: When the second crank arm passes over the trip latch and the movable shaft is in the initial position, the protruding direction of the guide hole is toward the trip latch, and the rotation axis of the second crank arm is located on the concave side of the guide hole. The arc-shaped inner wall of the guide hole away from the trip latch will limit the movable shaft so that the movable shaft is in a locked state.

4. The closing holding structure of the circuit breaker according to claim 1, characterized in that: The movable hole is in a straight line or arc shape.

5. The closing holding structure of the circuit breaker according to claim 1, characterized in that: The first crank arm further includes a rotating shaft, which extends along the extending direction of the movable shaft; two ends of the rotating shaft are connected to the two first arm plates; and the second crank arm is rotatably sleeved on the rotating shaft.

6. The closing holding structure of the circuit breaker according to claim 5, characterized in that: The second turning arm includes two second arm plates connected to each other, and the two second arm plates are arranged at intervals along the arrangement direction of the two first arm plates; the movable hole is opened on the two second arm plates; The movable shaft includes a coaxially arranged supporting portion and two movable portions, the supporting portion is located between the two second arm plates; in a plane perpendicular to the axis of the movable shaft, the diameter of the supporting portion is greater than the width of the movable hole; the two movable portions are located at both ends of the supporting portion, and the movable portions pass through the movable hole and the guide hole in sequence.

7. The closing holding structure of the circuit breaker according to claim 6, characterized in that: The first crank arm further includes a connecting member extending along the arrangement direction of the two first arm plates, with two ends of the connecting member respectively connected to the two first arm plates, and the connecting member is located on the outside of the second crank arm.

8. The closing holding structure of the circuit breaker according to claim 7, characterized in that: The second crank arm further includes a limiting wheel, which extends along the arrangement direction of the two second arm plates; the limiting wheel is rotatably arranged between the two second arm plates; The elastic return member includes a torsion spring body sleeved on the rotating shaft, and two extensions extending from both ends of the torsion spring body; the two extensions are respectively limited on the limiting wheel and one of the connecting members, and the torsion spring body releases kinetic energy so as to apply elastic force to the second crank arm through the limiting wheel.

9. The closing holding structure of the circuit breaker according to claim 8, characterized in that: The second crank arm further includes a limiting shaft, which extends along the arrangement direction of the two second arm plates, with both ends of the limiting shaft passing through the two second arm plates respectively, and the limiting shaft is used to pass through the limiting wheel so that the limiting wheel can rotate around the limiting shaft; The limiting shaft is located outside the first crank arm, and both ends of the limiting shaft can respectively abut against the outer peripheral walls of the two first arm plates.

10. A circuit breaker, characterized in that: include: The circuit breaker body is used to connect with the external circuit; An operating mechanism comprising: A tripping latch, which is in driving connection with the circuit breaker body; The trip latch can be switched between a closing holding position and an opening position, so that the closing and opening of the circuit breaker body can be controlled by the trip latch; The closing holding structure of the circuit breaker according to any one of claims 1 to 9 is capable of resisting and limiting the opening latch so that the opening latch is limited to the closing holding position.

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