Switching-on holding structure of circuit breaker and circuit breaker

Abstract

The invention provides a closing holding structure of a circuit breaker and the circuit breaker. The closing 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] This invention relates to the field of power distribution technology, and in particular to a circuit breaker closing and holding structure and a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and disconnecting current under normal and abnormal circuit conditions. Circuit breakers prevent damage to circuits caused by overcurrent, overload, or short circuits, thus preventing safety accidents.

[0003] A circuit breaker consists of a circuit breaker body and an operating mechanism. The circuit breaker body is electrically connected to a circuit, enabling it to close, carry, and disconnect the circuit. The operating mechanism is connected to the circuit breaker body. The operating mechanism is a crucial component of an AC high-voltage vacuum circuit breaker, and its reliability directly affects 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 circuit breaker body.

[0004] The operating mechanism includes a tripping stop, a first crank arm, a second crank arm, and a resilient reset element. The tripping stop is used to switch the circuit breaker body between closing and opening. The first crank arm can rotate under 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, thereby holding the tripping stop. The resilient reset element is connected between the first and second crank arms to reset the second crank arm, facilitating the relative rotation of the first and second crank arms. When the operating mechanism switches to the closing holding position, the first crank arm drives the second crank arm to rotate, and the resilient reset element resets the second crank arm, so that the second crank arm holds and limits the tripping stop, 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 tripping stop, and the tripping stop rotates to open the circuit breaker body, thereby disconnecting 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. During the movement of the first and second crank arms, the opening stop and the elastic reset component will generate a strong impact force on the rotating connection between the second and first crank arms, which makes the rotating connection between the second and first crank arms prone to damage, posing a safety hazard. Summary of the Invention

[0006] The purpose of this application is to provide a circuit breaker closing and holding structure and 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-mentioned technical problems, this application adopts the following technical solution:

[0008] According to one aspect of this application, a closing holding structure for a circuit breaker is provided for supporting and limiting the opening stop, comprising: a first crank arm, a second crank arm, a movable shaft, and a resilient reset member; the first crank arm is connected to an external main shaft for rotation about the main shaft; the first crank arm includes two interconnected first arm plates, spaced apart, each first arm plate having a guide hole extending away from the main shaft; the second crank arm is rotatably connected to the first crank arm and located between the two first arm plates, the rotation axis of the second crank arm being parallel to the rotation axis of the main shaft; the second crank arm has a movable hole relative to the guide hole; the extension direction of the movable hole is parallel to the extension direction of the guide hole. The two sides have an included angle; the movable shaft is used to abut and limit the tripping stop; the movable shaft can move within the guide hole to switch between an initial position and a clearance position; the movable shaft can also move within the movable hole; an 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 clearance 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 member absorbs kinetic energy; when the second crank arm passes the tripping stop, 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 clearance position to the initial position within the guide hole.

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

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

[0011] In some embodiments, the movable hole is straight or arc-shaped.

[0012] In some embodiments, the first crank arm further includes a rotating shaft that 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 sleeved on the rotating shaft.

[0013] In some embodiments, the second crank arm includes two interconnected second arm plates, which are spaced apart along the arrangement direction of the two first arm plates; each of the two second arm plates is provided with the movable hole; the movable shaft includes a coaxially arranged abutment portion and two movable portions, the abutment portion being located between the two second arm plates; in a plane perpendicular to the axis of the movable shaft, the diameter of the abutment portion is larger than the width of the movable hole; the two movable portions are located at both ends of the abutment 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 connector that extends along the arrangement direction of the two first arm plates, with both ends of the connector connected to the two first arm plates respectively, and the connector 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 reset 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 to the limiting wheel and a connecting member, and the torsion spring body releases kinetic energy to apply an elastic force to the second crank arm through the limiting wheel.

[0017] In some embodiments, the second crank arm further includes a limiting shaft extending 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. 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 both ends of the limiting shaft can abut against the outer peripheral wall of the two first arm plates respectively.

[0018] A circuit breaker includes: a circuit breaker body and an operating mechanism; the circuit breaker body is used to connect to an external circuit; the operating mechanism includes: a tripping lever and a closing holding structure as described above; the tripping lever is tractively connected to the circuit breaker body; the tripping lever is switchable between a closing holding position and a tripping position, so as to control the closing and tripping of the circuit breaker body through the tripping lever; the closing holding structure is capable of resisting and limiting the tripping lever, so that the tripping lever is limited to the closing holding position.

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

[0020] In this application, when the circuit breaker is closed, the main shaft drives the first crank arm to rotate, causing the movable shaft to abut against the side wall of the trip stop. The movable shaft moves from the initial position to the clearance position within the guide hole, and pushes the second crank arm to rotate. The second crank arm applies force to the elastic reset member, causing the elastic reset member to absorb kinetic energy and convert it into elastic potential energy. When the second crank arm moves past the trip stop and to the lower side of the trip stop, 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 to move from the clearance position to the initial position, so that the movable shaft abuts against the lower end of the trip stop when the first crank arm rotates in the opposite direction, thereby limiting the trip stop and keeping it in the closed state. When the circuit breaker's closing holding structure moves, the trip stop transmits pressure directly to the first crank arm through the movable shaft, thereby effectively preventing damage to the rotating connection between the second crank arm and the first crank arm, and effectively extending the service life of the closing holding structure. Attached Figure Description

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

[0022] Figure 2 This is a schematic diagram of the closing and holding structure of this application.

[0023] Figure 3 yes Figure 3 The diagram shows the structure after removing the first arm plate.

[0024] Figure 4 This is a schematic diagram of the structure of the second crank arm in this application.

[0025] The reference numerals in the attached drawings are explained as follows: 110, trip lever; 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 part; 420, movable part; 500, elastic reset part; 510, torsion spring body; 520, extension part. Detailed Implementation

[0026] Typical embodiments embodying the features and advantages of this application will be described in detail in the following description. It should be understood that this application can have various variations in different embodiments, all of which do not depart from the scope of this application, and the descriptions and illustrations therein are for illustrative purposes only and not intended to limit this application.

[0027] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] A circuit breaker can close to connect a circuit and open to disconnect a circuit.

[0029] A circuit breaker may include a circuit breaker body and an operating mechanism. The circuit breaker body is used for electrical connection with a circuit, thereby enabling it to close, carry, and disconnect the circuit. The operating mechanism is connected to the circuit breaker body. The operating mechanism is an important component of the circuit breaker, and the reliability of its operation directly affects 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 stop, a closing holding structure, and a main shaft. The tripping stop is drivenly connected to the circuit breaker body. The tripping stop can rotate around itself to switch between the closing holding position and the tripping position, thereby controlling the closing and tripping of the circuit breaker body. The closing holding structure can hold and limit the tripping stop, so that the tripping stop is limited to the closing holding position. The main shaft is drivenly connected to the closing holding structure to drive the movement of the closing holding structure, thereby realizing the switching of the operating mechanism between the closing holding position and the tripping position.

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

[0032] See Figure 1 and Figure 2This application provides a closing holding structure for a circuit breaker, used to hold and limit the opening stop 110. The closing holding structure may include: a first crank arm 200, a second crank arm 300, a movable shaft 400, and an elastic reset member 500. The first crank arm 200 is used to connect to an external main shaft 120 for rotation around the main shaft 120. The first crank arm 200 may include two interconnected first arm plates 210, which are spaced apart. Each of the two first arm plates 210 may have a guide hole 211 extending in a direction 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 have a movable hole 311 relative to the guide hole 211, and the extension direction of the movable hole 311 forms an angle with the extension direction of the guide hole 211. The movable shaft 400 is used to abut and limit the tripping stop 110. The movable shaft 400 can move within the guide hole 211 to switch between an initial position and a clearance position; the movable shaft 400 can also move within the movable hole 311. The elastic reset member 500 can connect the first crank arm 200 and the second crank arm 300 to absorb the kinetic energy of the second crank arm 300 during rotation, thereby resetting the second crank arm 300. Specifically, when the movable shaft 400 moves from the initial position to the clearance position, it abuts against the inner wall of the movable hole 311 to drive the second crank arm 300 to rotate, and the elastic reset member 500 absorbs the kinetic energy. When the second crank arm 300 passes the tripping stop 110, the elastic reset member 500 releases the kinetic energy to apply an elastic force to the second crank arm 300, causing it to rotate. The inner wall of the movable hole 311 drives the movable shaft 400 to move from the clearance position to the initial position within the guide hole 211.

[0033] When the circuit breaker closes, the main shaft 120 rotates, causing the first crank arm 200 to rotate around the rotation axis of the main shaft 120 toward the trip stop 110. When the closing holding structure contacts the trip stop 110, the first crank arm 200 continues to rotate, the movable shaft 400 contacts the trip stop 110, and the trip stop 110 applies pressure to the movable shaft 400, causing the movable shaft 400 to move from its initial position to a clearance position within the guide hole 211. During the process of the movable shaft 400 moving from its initial position to the clearance position, the movable shaft 400 abuts against the inner wall of the movable hole 311, causing the second crank arm 300 to rotate, thereby causing the movable shaft 400 and the second crank arm 300 to clear the trip stop 110, so that the closing holding structure can pass over the trip stop 110. When the second crank arm 300 rotates, part of its kinetic energy is converted into the elastic potential energy of the elastic reset member 500.

[0034] After the closing holding structure passes the opening stop 110, the main shaft 120 drives the first crank arm 200 to rotate, and the elastic reset 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 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 make the movable shaft 400 abut against the opening stop 110, thereby limiting the rotation of the opening stop 110 and keeping the opening stop 110 in the closing holding 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 taken as a reference. The direction of the opening stop relative to the closing holding structure is the upper part of the following text, and the direction away from the upper part is the lower part of the following text. The direction of the rotation axis of the main shaft is the front-back direction of the following text, and the direction perpendicular to the up-down and front-back directions is the left-right direction of the following text.

[0036] When the closing holding structure rotates toward the opening stop 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 holding structure passes the opening stop 110, the movable shaft 400 moves back to its initial position under the action of the elastic reset member 500. When the closing holding structure rotates toward the opening stop 110 so that the movable shaft 400 abuts against and limits the opening stop 110, the first crank arm 200 rotates in the reverse direction.

[0037] Figure 3 yes Figure 3 The diagram shows the structure after removing the first arm plate.

[0038] See Figures 1 to 3 In this embodiment, the first crank arm 200 is driveably connected to the main shaft 120, enabling it to rotate under the drive of the main shaft 120 and drive 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-back direction. The two first arm plates 210 are clamped on the front and rear sides of the second crank arm 300 to improve the structural strength and reliability of the closing and holding structure.

[0039] See Figures 1 to 3In this embodiment, the first crank arm 200 may further include a connector 220. The connector 220 extends along the arrangement direction of the two first arm plates 210, and its two ends are respectively connected to the two first arm plates 210. The connector 220 enables 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 holding structure. The connector 220 is located on the outside of the second crank arm 300 to avoid the second crank arm 300, thereby facilitating the rotation of the second crank arm 300.

[0040] In some embodiments, there may be multiple connectors 220. Multiple 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 connector 220 may be located between the spindle hole 250 and the guide hole 211. The connector 220 can be positioned relative to one end of the elastic reset member 500, thereby facilitating the absorption and release of kinetic energy by the elastic reset member 500.

[0042] In some embodiments, the connector 220 may include a support portion and two connecting portions. The support portion extends in a front-rear direction. The end walls of the support portion may abut against the opposing 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 towards each other, and improve the structural strength and stability of the first crank arm 200. The two connecting portions are respectively disposed at both ends of the support portion, and the connecting portions extend in a front-rear direction. The two connecting portions pass through and are confined within the two first arm plates 210 to facilitate the assembly of the first crank arm 200, improve the installation efficiency of the closing and holding structure, and also improve the connection strength between the two arm plates, thereby improving the impact resistance of the closing and holding structure.

[0043] In other embodiments, the cross-sectional area of ​​the connecting portion is smaller than that of the supporting portion in a plane perpendicular to the front-back direction, 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 rotating shaft 230. The rotating shaft 230 extends along the extending direction of the movable shaft 400. The two ends of the rotating shaft 230 are connected to the two first arm plates 210 to improve the structural strength of the first crank arm 200. The second crank arm 300 is rotatably sleeved on the rotating shaft 230 to facilitate the rotation of the second crank arm 300.

[0046] In some embodiments, the rotating shaft 230 may be located at the 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 and holding structure.

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

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

[0049] In other embodiments, the first arm plate 210 has a limiting groove 251 recessed in the inner wall of the spindle hole 250 to facilitate engagement with the spindle 120. The outer peripheral wall of the spindle 120 has a limiting protrusion 121 protruding. The limiting groove 251 on the first arm plate 210 and the limiting protrusion 121 on the spindle 120 are adapted to improve the connection strength between the first arm plate 210 and the spindle 120, so as to facilitate the stable and reliable transmission of force on the spindle 120 to the first arm plate 210.

[0050] In other embodiments, the connection between the main shaft 120 and the first arm plate 210 can also be a 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, guide holes 211 are provided at the same far end of the two first arm plates 210. The guide holes 211 are used to guide and support the movable shaft 400 so that the force on the movable shaft 400 can be directly transmitted to the first arm plate 210 through the inner wall of the guide holes 211, thereby improving the structural strength and load-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 trip stop 110, so that the movable shaft 400 approaches and abuts against the trip stop 110. As the first crank arm 200 continues to rotate forward, the trip stop 110 presses against the movable shaft 400, so that the movable shaft 400 moves from its initial position to a clearance position within the guide hole 211. During the movement of the movable shaft 400, the elastic reset member 500 absorbs kinetic energy, and the pressing force of the trip stop 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 this pressing 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 clockwise to pass the trip stop 110, the movable shaft 400 moves to the avoidance position within the guide hole 211. When the first crank arm 200 continues to rotate clockwise to move away from the trip stop 110, the trip stop 110 separates from the movable shaft 400, and the elastic reset member 500 converts elastic potential energy into kinetic energy to apply an elastic force to the second crank arm 300. The second crank arm 300 rotates under the action of the elastic force, driving the movable shaft 400 to move from the avoidance position to the initial position.

[0054] When the main shaft 120 drives the first crank arm 200 past the trip stop 110, the movable shaft 400 moves to the initial position under the action of the elastic reset member 500. The main shaft 120 drives the first crank arm 200 to reverse so that the movable shaft 400 abuts against the lower end of the trip stop 110, thereby limiting the trip stop 110 so that the trip stop 110 is kept in the closing holding position.

[0055] Compared to traditional closing retention structures, the closing retention structure of this application can drive the movable shaft 400 to move by rotating the first crank arm 200, which can effectively reduce the torque of the movable shaft 400 relative to the main shaft 120 when it moves. This reduces the moving speed of the movable shaft 400 within the movable hole 311, so that the relative movement between the first crank arm 200 and the second crank arm 300 can be achieved through the movable hole 311, which is only a small length. The smaller size of the movable hole 311 can further improve the structural strength and load-bearing capacity of the second arm plate 310 and extend the service life of the closing retention 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 rotation axis 230, the movable shaft 400 can move within the guide hole 211 and can move relative to the second crank arm 300 within the movable hole 311.

[0057] In some embodiments, when the second crank arm 300 passes the trip stop 110 and the movable shaft 400 is in the initial position, the protruding direction of the guide hole 211 is toward the trip stop 110, the rotation axis of the second crank arm 300 is located on the recessed side of the guide hole 211, and the arcuate inner wall of the guide hole 211 away from the trip stop 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 abuts against the lower end of the trip stop 110 and applies downward pressure to the movable shaft 400. After the movable shaft 400 is subjected to pressure, the arc-shaped inner wall of the guide hole 211 at the end 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 stop 110.

[0059] In some embodiments, one end of the guide hole 211 away from the main shaft 120 is located on the lower side of the middle of the guide hole 211, so as to improve the stability and reliability of the movable shaft 400 and the trip stop 110 when they are mutually limited.

[0060] In other embodiments, the end of the guide hole 211 away from the main shaft 120 is located below the other parts of the guide hole 211, so that when the movable shaft 400 and the trip stop 110 are mutually limited, 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 pressured by the trip stop, effectively improving the limiting stability and reliability of the closing holding structure and the trip stop 110.

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

[0062] Figure 4 This is a schematic diagram of the structure of the second crank arm in 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 enabling the circuit breaker to operate cyclically.

[0066] The second crank arm 300 may include two interconnected second arm plates 310. The second arm plates 310 extend vertically. The two second arm plates 310 are spaced apart in the front-back direction. Both second arm plates 310 are sleeved on the rotating shaft 230 so that they can both rotate around the rotating shaft 230.

[0067] Both second arm plates 310 have movable holes 311 relative to the guide holes 211, and the movable holes 311 extend in the vertical direction. Both ends of the movable shaft 400 are provided with adjacent movable holes 311 and guide holes 211, so that when the second crank arm 300 rotates around the rotating shaft 230, the movable shaft 400 can rotate in the movable holes 311 and guide holes 211 respectively, thereby realizing the relative rotation of the second crank arm 300 and the first crank arm 200, ensuring the stable and reliable movement of the movable shaft 400, and improving the safety and stability of the closing holding structure.

[0068] See Figures 1 to 4 In this embodiment, the movable hole 311 is straight or arc-shaped. The movable hole 311 extends along the extension direction of the second arm plate 310 so that when the second crank arm 300 rotates around the rotation axis 230, the movable shaft 400 can move up and down within the movable hole 311, thereby enabling the movable shaft 400 to move within the guide hole 211 and 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, which extends 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 mutually limit each other, so as to cooperate with the connecting member 220, thereby enabling the elastic reset member 500 to absorb the kinetic energy when the second crank arm 300 rotates, and enabling the elastic reset member 500 to 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, which extends along the arrangement direction of the two second arm plates 310. Both ends of the limiting shaft 321 pass through the two second arm plates 310 respectively, facilitating the synchronous rotation of the two second arm plates 310. The limiting shaft 321 is used to mount a limiting wheel 322, allowing the limiting wheel 322 to rotate around the limiting shaft 321.

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

[0072] In some embodiments, the second arm plate 310 may be arc-shaped, straight-lined, or other irregular in shape so that the second arm plate 310 can rotate around the rotation axis 230, and a movable hole 311 may be provided relative to the guide hole 211 so that the rotation of the second arm plate 310 can drive 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, allowing the second crank arm 300 to pass the trip stop 110 with only a small rotational torque, and enabling the closing holding structure to limit the trip stop 110. This effectively reduces the pushing force of the main shaft 120 on the closing holding structure, improves the working efficiency of the closing holding structure, improves the working efficiency of the circuit breaker, effectively avoids safety hazards caused by fatigue fracture of the second crank arm 300, the rotating shaft 230, and the movable shaft 400, and extends the service life of the closing holding structure.

[0074] Furthermore, 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 and holding structure while realizing its functional role, thereby reducing installation and production processes and reducing the production cost of the closing and holding structure.

[0075] See Figures 1 to 4 In this embodiment, the movable shaft 400 passes through 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, thereby switching 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 up with each other, ensuring the stable and reliable operation of the closing mechanism.

[0076] The movable shaft 400 may include a coaxially arranged supporting portion 410 and two movable portions 420. The supporting 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 supporting portion 410 is larger than the width of the movable hole 311. The two movable portions 420 are located at both ends of the supporting portion 410, and the movable portions 420 pass through the movable hole 311 and the guide hole 211 in sequence.

[0077] The abutment part 410 can abut against the side wall of the tripping stop 110 so that it can move within the guide hole 211 and the movable hole 311 under the pressure of the tripping stop 110. In addition, the abutment part 410 can also abut against the lower end of the tripping stop 110 so as to limit the tripping stop 110 to the closing holding position.

[0078] In related technologies, circuit breakers have relatively complex structures. To improve space utilization and reduce the size of the circuit breaker, the closing and holding structure needs to have smaller internal components. However, smaller components can lead to fatigue fracture in the closing and holding structure. The closing and holding structure of this application effectively reduces the number of components while ensuring functionality. On the one hand, without changing the overall size, it allows for a larger shaft diameter for components such as the movable shaft 400, thereby improving the strength and service life of the closing and holding structure. On the other hand, it reduces moving parts, improves the rotational accuracy of the closing and holding structure, reduces malfunctions, and enhances reliability.

[0079] See Figures 1 to 4 In this embodiment, the elastic reset 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 reset member 500 can be a torsion spring. The elastic reset member 500 may include a torsion spring body 510 sleeved on the rotating shaft 230, and two extensions 520 extending from both ends of the torsion spring body 510. The two extensions 520 are respectively limited to the limiting wheel 322 and a connecting member 220. The torsion spring body 510 releases kinetic energy so that it can apply an elastic force to the second crank arm 300 through the limiting wheel 322.

[0081] Compared to traditional tension springs, the torsion spring body 510 and the two extensions 520 can accommodate the small-angle rotation of the second crank arm 300, and can also avoid the problem of hook breakage in traditional tension springs, reducing the processing difficulty of the elastic reset component 500.

[0082] In some embodiments, the two extensions 520 abut against the opposite sides of the limiting wheel 322 and the connecting member 220, respectively. When the first crank arm 200 rotates clockwise, the trip stop 110 presses against the movable shaft 400, and the movable shaft 400 moves from the initial position toward the avoidance position. The movable shaft 400 drives the second crank arm 300 to rotate counterclockwise, 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 the trip stop 110, the torsion spring body 510 releases elastic potential energy and converts it into elastic force. The two extensions 520 move toward each other, so that the limiting wheel 322 and the connecting member 220 move closer to each other. The second crank arm 300 rotates clockwise, thereby driving the movable member to move from the avoidance position to the initial position.

[0083] See Figures 1 to 4In this application, when the user closes the circuit breaker, the main shaft 120 drives the first crank arm 200 to rotate forward, and the first crank arm 200 approaches the trip stop 110, so that the movable shaft 400 abuts against the side wall of the trip stop 110. When the first crank arm 200 continues to rotate forward, and the trip stop 110 presses against the movable shaft 400, the movable shaft 400 moves from its initial position to a clearance position within the guide hole 211. During the movement of the movable shaft 400, the movable shaft 400 moves up and down within the movable hole 311 and abuts against one side wall of the movable shaft 400 in the left-right direction, thereby driving the second crank arm 300 to reverse. When the second crank arm 300 reverses, the elastic reset member 500 absorbs part of the kinetic energy of the second crank arm 300 and converts it into elastic potential energy.

[0084] When the main shaft 120 drives the first crank arm 200 past the trip stop 110, the movable shaft 400 separates from the trip stop 110, and the elastic reset 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 clockwise and drives the movable shaft 400 to move from the avoidance position to the initial position. Then, the main shaft 120 drives the first crank arm 200 to rotate counterclockwise, so as to hold the movable shaft 400 against the trip stop 110, thereby limiting the trip stop 110 to the closing holding position and completing the closing operation.

[0085] During the aforementioned movement, the pressure generated by the trip stop 110 on the movable shaft 400 is directly transmitted to the first crank arm 200, thereby effectively preventing 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, and effectively extending the service life of the closing holding structure.

[0086] See Figures 1 to 4 This application also provides a circuit breaker, comprising: a circuit breaker body and an operating mechanism. The circuit breaker body is used to connect to an external circuit. The operating mechanism may include: a tripping stop 110 and a closing holding structure of the circuit breaker. The tripping stop 110 is operatively connected to the circuit breaker body. The tripping stop 110 is switchable between a closing holding position and a tripping position, so as to control the closing and tripping of the circuit breaker body via the tripping stop 110. The closing holding structure can abut against and limit the tripping stop 110, so that the tripping stop 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 via the main shaft 120, so that the trip stop 110 presses against the movable shaft 400. The movable shaft 400 moves from the initial position to the avoidance position, and the second crank arm 300 reverses around the rotating shaft 230 and presses against the elastic reset member 500.

[0088] After the first crank arm 200 passes the trip stop 110, the elastic reset member 500 pushes the second crank arm 300 to rotate clockwise, so that the second crank arm 300 drives the movable shaft 400 to move from the avoidance position to the initial position. Finally, the main shaft 120 drives the first crank arm 200 to rotate counterclockwise, so that the movable shaft 400 abuts against the lower end of the trip stop 110, thereby limiting the trip stop 110 to the closed holding position, and the circuit breaker closes.

[0089] Although this application has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since this application can be embodied in many 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 variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A closing holding structure for a circuit breaker, used to abut and limit the opening stop, characterized in that, include: The first crank arm is used to connect to the main shaft in the outside world so as 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 each of the two first arm plates is provided with a guide hole, the guide hole extending in a direction away from the main shaft; The second crank arm is rotatably connected to the first crank arm and located between the two first arm plates. The rotation axis of the second crank arm is parallel to the rotation axis of the main shaft. A movable hole is provided on the second crank arm relative to the guide hole. The extension direction of the movable hole and the extension direction of the guide hole form an angle. A movable shaft is used to abut and limit the tripping lever; the movable shaft is movable within the guide hole to switch between an initial position and a clearance position; the movable shaft is also movable within the movable hole. An elastic reset member, which connects the first crank arm and the second crank arm, is used to reset the second crank arm; 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 member absorbs kinetic energy; when the second crank arm passes the trip stop, 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 within the guide hole.

2. The closing and holding structure of the circuit breaker according to claim 1, characterized in that, The guide hole is arc-shaped.

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

4. The closing and holding structure of the circuit breaker according to claim 1, characterized in that, The movable hole is either straight or arc-shaped.

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

6. The closing and holding structure of the circuit breaker according to claim 5, characterized in that, The second crank arm includes two interconnected second arm plates, which are spaced apart along the arrangement direction of the two first arm plates; the two second arm plates are provided with the movable holes. The movable shaft includes a coaxially arranged abutment and two movable parts. The abutment is located between the two second arm plates. In a plane perpendicular to the axis of the movable shaft, the diameter of the abutment is larger than the width of the movable hole. The two movable parts are located at both ends of the abutment and pass through the movable hole and the guide hole in sequence.

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

8. The closing and holding structure of the circuit breaker according to claim 7, characterized in that, The second crank arm also includes a limiting wheel, which extends along the arrangement direction of the two second arm plates; the limiting wheel is rotatably disposed between the two second arm plates; The elastic reset 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 to the limiting wheel and a connecting member, and the torsion spring body releases kinetic energy to apply an elastic force to the second crank arm through the limiting wheel.

9. The closing and holding structure of the circuit breaker according to claim 8, characterized in that, The second crank arm also includes a limiting shaft, which extends along the arrangement direction of the two second arm plates. The two ends of the limiting shaft pass through the two second arm plates respectively. 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 abut against the outer peripheral wall of the two first arm plates.

10. A circuit breaker, characterized in that, include: The circuit breaker body, which is used to connect to external circuits; Operating mechanism, which includes: The tripping lever is connected to the circuit breaker body in a driving connection. The tripping lever can switch between the closed holding position and the tripping position, so that the circuit breaker body can be controlled to close and open through the tripping lever; The closing holding structure of the circuit breaker as described in any one of claims 1 to 9 is capable of abutting and limiting the opening stopper so that the opening stopper is limited to the closing holding position.

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