A circuit breaker opening and closing transmission structure, a circuit breaker opening and closing operating mechanism and a circuit breaker

Abstract

The application relates to a circuit breaker opening and closing transmission structure, a circuit breaker opening and closing operating mechanism and a circuit breaker, and belongs to the field of switch devices. The transmission structure comprises a push rod connected with an insulating pull rod, an output crank arm installed on an output shaft of the operating mechanism, and a transmission crank arm hinged on a mechanism fixed plate. The first branch arm of the transmission crank arm is hinged with the push rod, and the transmission connecting rod is hinged between the second branch arm of the transmission crank arm and the branch arm of the output crank arm. In the opening state, the transmission connecting rod and the branch arm of the output crank arm are collinear and are located at the dead point position, the opening rebound can be reduced, the opening stability and operation reliability can be improved, and the acceleration of the output crank arm at the beginning moment of the closing is the maximum value. In the closing state, the pull rod connecting rod and the fixed plate connecting rod are collinear with the insulating pull rod and are located at the dead point position, the reaction force of the contact spring can be shared, the pressure borne by the closing stopper is reduced, the service life of the closing stopper is prolonged, the transmission connecting rod is collinear with the second branch arm of the transmission crank arm, and the acceleration of the transmission crank arm at the beginning moment of the opening is the maximum value.

Description

Technical Field

[0001] This invention relates to a circuit breaker opening and closing transmission structure, a circuit breaker opening and closing operating mechanism, and a circuit breaker, belonging to the field of switchgear technology. Background Technology

[0002] Vacuum circuit breakers are a type of switching equipment widely used in power systems. They mainly consist of a vacuum interrupter, an operating mechanism, and an insulating support. During operation, the moving contact and stationary contact are opened and closed by the action of the operating mechanism, thereby realizing the conduction and disconnection of the circuit.

[0003] The commonly used circuit breaker operating mechanism is the spring operating mechanism, such as... Figure 1 and Figure 2 As shown, the circuit breaker includes a vacuum interrupter 1 and a mechanism box 2 located below the vacuum interrupter 1. The mechanism box 2 houses a spring-operated mechanism and a mechanism fixing plate 3 for mounting the various components of the spring-operated mechanism. An oil buffer 4 is also installed on one side of the mechanism box 2, used for buffering and limiting the opening process. The spring-operated mechanism includes a opening spring 5 and push rods 8 that are operatively connected to the insulating pull rods 7 of the three-phase vacuum interrupter 1. The two ends of the opening spring 5 are fixed to the mechanism fixing plate 3 and the push rods 8, respectively. The spring-operated mechanism also includes a main shaft assembly 10 and an output shaft assembly 9 operatively connected to the main shaft assembly 10. The output shaft assembly 9 includes an output shaft and an output crank arm mounted on the output shaft. One arm of the output crank arm is operatively connected to the push rod 8, used to control the movement of the push rod 8, which in turn drives the insulating pull rod 7 to close the circuit.

[0004] In the closed state, the opening spring 5 is at its maximum tension. When opening is required, the opening spring 5 releases energy and pulls the push rod 8 to the right. During this process, the push rod 8 is moved downwards and to the right, and the insulating pull rod 7 moves downwards under the action of the push rod 8 to open the circuit. When the push rod 8 contacts the oil buffer 4, the push rod 8 is decelerated by the action of the oil buffer 4, and finally the moving contact connected to the insulating pull rod 7 stops in the open position. Figure 1 and Figure 2 This is the open state (but the moving contact is not shown), which realizes the separation of the moving contact and the stationary contact of the three-phase vacuum interrupter 1, thereby realizing the opening of the circuit breaker. At this time, the opening spring is still in the stretched state to maintain the open state of the circuit breaker.

[0005] The existing circuit breaker operating mechanism has the following problem: During the opening process, the rapid release of energy from the opening spring causes a significant impact on the oil buffer, resulting in several stroke buffering and reciprocating rebounds before the push rod finally stops at the open position. During this process, the push rod causes the moving contact connected to the insulating rod to repeatedly approach and move away from the stationary contact. This can lead to the distance between the moving and stationary contacts becoming less than the safe clearance for the opening position, resulting in reignition in the arc-extinguishing chamber and ultimately causing the circuit breaker to fail to open, thus reducing the circuit breaker's opening stability and operational reliability. Summary of the Invention

[0006] The purpose of this invention is to provide a circuit breaker opening and closing transmission structure to solve the technical problem in the prior art where large opening rebound reduces opening stability and circuit breaker operational reliability. Another purpose of this invention is to provide a circuit breaker opening and closing operating mechanism and a circuit breaker to solve the same technical problem.

[0007] To achieve the above objectives, the circuit breaker opening and closing transmission structure of the present invention adopts the following technical solution: A circuit breaker opening and closing transmission structure includes a push rod for transmission connection with an insulating pull rod of a three-phase arc-extinguishing chamber and an output crank arm for mounting on the output shaft of an operating mechanism. It also includes a transmission crank arm hinged to a mechanism fixing plate of the operating mechanism. The transmission crank arm includes a first arm and a second arm arranged at an angle. The first arm is hinged to the push rod. The transmission structure further includes a transmission connecting rod with one end hinged to the arm of the output crank arm and the other end hinged to the second arm. When the insulating pull rod moves to the open state, the transmission connecting rod is collinear with the arm of the output crank arm and is in a dead position.

[0008] The beneficial effects of the above technical solution are as follows: This invention is an improved invention, the improvement being the addition of a transmission crank arm and a transmission connecting rod. The transmission crank arm is hinged to the mechanism fixing plate of the operating mechanism, allowing for fixed-axis rotation. The transmission crank arm includes a first arm and a second arm arranged at an angle. The first arm is hinged to the push rod. The transmission structure also includes a transmission connecting rod with one end hinged to the arm of the output crank arm and the other end hinged to the second arm. Thus, when the output shaft rotates, the arm of the output crank arm drives the second arm of the transmission crank arm to rotate via the transmission connecting rod, realizing the rotation of the transmission crank arm. Subsequently, the first arm of the transmission crank arm drives the push rod to move, and the push rod drives the insulating pull rod to move, realizing the closing operation. During this process, the opening spring stores energy. When opening, the opening spring releases energy, causing the push rod to move in the opposite direction. This, in turn, drives the first arm of the transmission crank arm to rotate in the opposite direction, causing the second arm of the transmission crank arm to rotate in the opposite direction via the transmission connecting rod, realizing the opening operation. When the insulating pull rod moves to the open state, the transmission link and the support arm of the output crank arm are collinear and in a dead position. Through the constraint of the dead position of the mechanical structure, the opening rebound effect caused by the push rod hitting the oil buffer is reduced, thereby improving the opening stability and operational reliability of the circuit breaker.

[0009] Furthermore, when the insulating pull rod moves to the closed state, the transmission connecting rod is collinear with the second arm of the transmission crank arm.

[0010] The beneficial effect of the above technical solution is that it enables the transmission crank arm to reach its maximum acceleration at the moment of opening, thereby realizing the rapid movement of the transmission crank arm.

[0011] Furthermore, the transmission structure also includes a pull rod connecting rod with one end for hinged to the insulating pull rod, and a fixed plate connecting rod with one end for hinged to the mechanism fixed plate. The other ends of the pull rod connecting rod and the fixed plate connecting rod are hinged to the push rod through the same pin. The first arm of the transmission crank arm, the push rod, the fixed plate connecting rod and the mechanism fixed plate form a parallelogram mechanism.

[0012] The beneficial effects of the above technical solution are as follows: the first arm of the transmission crank arm, the push rod, the fixed plate connecting rod and the mechanism fixed plate form a parallelogram mechanism. At the same time, each insulating pull rod is connected to a pull rod connecting rod, and each pull rod connecting rod is hinged to a fixed plate connecting rod. Therefore, two adjacent fixed plate connecting rods, push rods and mechanism fixed plates also form a parallelogram mechanism, which facilitates the control of the push plate's movement. In turn, the push plate controls the movement of the insulating pull rod through the pull rod connecting rod.

[0013] Furthermore, when the insulating pull rod moves to the closed state, the pull rod and the fixed plate pull rod are collinear with the insulating pull rod and are in a dead position.

[0014] The beneficial effects of the above technical solution are as follows: it can resist the reaction force of the contact spring outside the insulating pull rod, that is, the reaction force of the contact spring is shared by the dead point position of the pull rod connecting rod and the fixed plate connecting rod, and will not be transmitted to the output crank arm in the reverse through the push rod, transmission crank arm and transmission connecting rod. It can reduce the closing holding force of the closing stop in the closing holding assembly on the output crank arm, reduce the pressure on the closing stop, and extend the life of the closing stop.

[0015] Furthermore, a bushing is fitted around the hinge shaft between the fixed plate connecting rod and the mechanism fixed plate.

[0016] The beneficial effect of the above technical solution is to reduce wear and tear.

[0017] Furthermore, a tripping spring is connected between the push rod and the mechanism fixing plate to store energy during the closing process to provide power for the tripping. The connection position between the tripping spring and the push rod, and the connection position between the first arm of the transmission crank and the push rod, are located on both sides of the transmission connection position between the intermediate phase insulating pull rod and the push rod.

[0018] The advantages of the above technical solution are: reasonable layout and convenient installation.

[0019] Furthermore, one of the support arms of the output crank arm and the second support arm of the transmission crank arm has an elongated hinge hole for connecting with the transmission link.

[0020] The beneficial effect of the above technical solution is that it facilitates the change of shape of the transmission link and realizes the intermediate transmission function.

[0021] Furthermore, the portion of the operating mechanism output shaft that is rotatably coupled with the mechanism fixing plate is fitted with a bushing.

[0022] The beneficial effect of the above technical solution is to reduce wear and tear.

[0023] To achieve the above objectives, the circuit breaker opening and closing operating mechanism of the present invention adopts the following technical solution: A circuit breaker opening and closing operating mechanism includes an operating mechanism body and an opening and closing transmission structure. The opening and closing transmission structure includes a push rod for drivingly connecting to the insulating pull rod of the three-phase arc-extinguishing chamber and an output crank arm for mounting on the output shaft of the operating mechanism. It also includes a transmission crank arm for hinged to the mechanism fixing plate of the operating mechanism. The transmission crank arm includes a first arm and a second arm arranged at an angle. The first arm is hinged to the push rod. The opening and closing transmission structure also includes a transmission connecting rod with one end hinged to the arm of the output crank arm and the other end hinged to the second arm. When the insulating pull rod moves to the open state, the transmission connecting rod is collinear with the arm of the output crank arm and is in a dead position.

[0024] The beneficial effects of the above technical solution are as follows: This invention is an improved invention, the improvement being the addition of a transmission crank arm and a transmission connecting rod. The transmission crank arm is hinged to the mechanism fixing plate of the operating mechanism, allowing for fixed-axis rotation. The transmission crank arm includes a first arm and a second arm arranged at an angle. The first arm is hinged to the push rod. The opening and closing transmission structure also includes a transmission connecting rod with one end hinged to the arm of the output crank arm and the other end hinged to the second arm. Thus, when the output shaft rotates, the arm of the output crank arm drives the second arm of the transmission crank arm to rotate via the transmission connecting rod, realizing the rotation of the transmission crank arm. Subsequently, the first arm of the transmission crank arm drives the push rod to move, and the push rod drives the insulating pull rod to move, realizing the closing operation. During this process, the opening spring stores energy. When opening, the opening spring releases energy, causing the push rod to move in the opposite direction. This, in turn, drives the first arm of the transmission crank arm to rotate in the opposite direction, causing the second arm of the transmission crank arm to rotate in the opposite direction via the transmission connecting rod, realizing the opening operation. When the insulating pull rod moves to the open state, the transmission link and the support arm of the output crank arm are collinear and in a dead position. Through the constraint of the dead position of the mechanical structure, the opening rebound effect caused by the push rod hitting the oil buffer is reduced, thereby improving the opening stability and operational reliability of the circuit breaker.

[0025] Furthermore, when the insulating pull rod moves to the closed state, the transmission connecting rod is collinear with the second arm of the transmission crank arm.

[0026] The beneficial effect of the above technical solution is that it enables the transmission crank arm to reach its maximum acceleration at the moment of opening, thereby realizing the rapid movement of the transmission crank arm.

[0027] Furthermore, the opening and closing transmission structure also includes a pull rod connecting rod with one end for hinged to the insulating pull rod, and a fixed plate connecting rod with one end for hinged to the mechanism fixed plate. The other ends of the pull rod connecting rod and the fixed plate connecting rod are hinged to the push rod through the same pin. The first arm of the transmission crank arm, the push rod, the fixed plate connecting rod and the mechanism fixed plate form a parallelogram mechanism.

[0028] The beneficial effects of the above technical solution are as follows: the first arm of the transmission crank arm, the push rod, the fixed plate connecting rod and the mechanism fixed plate form a parallelogram mechanism. At the same time, each insulating pull rod is connected to a pull rod connecting rod, and each pull rod connecting rod is hinged to a fixed plate connecting rod. Therefore, two adjacent fixed plate connecting rods, push rods and mechanism fixed plates also form a parallelogram mechanism, which facilitates the control of the push plate's movement. In turn, the push plate controls the movement of the insulating pull rod through the pull rod connecting rod.

[0029] Furthermore, when the insulating pull rod moves to the closed state, the pull rod and the fixed plate pull rod are collinear with the insulating pull rod and are in a dead position.

[0030] The beneficial effects of the above technical solution are as follows: it can resist the reaction force of the contact spring outside the insulating pull rod, that is, the reaction force of the contact spring is shared by the dead point position of the pull rod connecting rod and the fixed plate connecting rod, and will not be transmitted to the output crank arm in the reverse through the push rod, transmission crank arm and transmission connecting rod. It can reduce the closing holding force of the closing stop in the closing holding assembly on the output crank arm, reduce the pressure on the closing stop, and extend the life of the closing stop.

[0031] Furthermore, a bushing is fitted around the hinge shaft between the fixed plate connecting rod and the mechanism fixed plate.

[0032] The beneficial effect of the above technical solution is to reduce wear and tear.

[0033] Furthermore, a tripping spring is connected between the push rod and the mechanism fixing plate to store energy during the closing process to provide power for the tripping. The connection position between the tripping spring and the push rod, and the connection position between the first arm of the transmission crank and the push rod, are located on both sides of the transmission connection position between the intermediate phase insulating pull rod and the push rod.

[0034] The advantages of the above technical solution are: reasonable layout and convenient installation.

[0035] Furthermore, one of the support arms of the output crank arm and the second support arm of the transmission crank arm has an elongated hinge hole for connecting with the transmission link.

[0036] The beneficial effect of the above technical solution is that it facilitates the change of shape of the transmission link and realizes the intermediate transmission function.

[0037] Furthermore, the portion of the operating mechanism output shaft that is rotatably coupled with the mechanism fixing plate is fitted with a bushing.

[0038] The beneficial effect of the above technical solution is to reduce wear and tear.

[0039] To achieve the above objectives, the circuit breaker in this invention adopts the following technical solution: A circuit breaker includes a circuit breaker body and a tripping / closing operating mechanism. The tripping / closing operating mechanism includes an operating mechanism body and a tripping / closing transmission structure. The tripping / closing transmission structure includes a push rod for transmission connection with an insulating pull rod of a three-phase arc-extinguishing chamber and an output crank arm for mounting on the output shaft of the operating mechanism. It also includes a transmission crank arm for hinged to a mechanism fixing plate of the operating mechanism. The transmission crank arm includes a first arm and a second arm arranged at an angle. The first arm is hinged to the push rod. The tripping / closing transmission structure also includes a transmission connecting rod with one end hinged to the arm of the output crank arm and the other end hinged to the second arm. When the insulating pull rod moves to the tripping state, the transmission connecting rod is collinear with the arm of the output crank arm and is in a dead position.

[0040] The beneficial effects of the above technical solution are as follows: This invention is an improved invention, the improvement being the addition of a transmission crank arm and a transmission connecting rod. The transmission crank arm is hinged to the mechanism fixing plate of the operating mechanism, allowing for fixed-axis rotation. The transmission crank arm includes a first arm and a second arm arranged at an angle. The first arm is hinged to the push rod. The opening and closing transmission structure also includes a transmission connecting rod with one end hinged to the arm of the output crank arm and the other end hinged to the second arm. Thus, when the output shaft rotates, the arm of the output crank arm drives the second arm of the transmission crank arm to rotate via the transmission connecting rod, realizing the rotation of the transmission crank arm. Subsequently, the first arm of the transmission crank arm drives the push rod to move, and the push rod drives the insulating pull rod to move, realizing the closing operation. During this process, the opening spring stores energy. When opening, the opening spring releases energy, causing the push rod to move in the opposite direction. This, in turn, drives the first arm of the transmission crank arm to rotate in the opposite direction, causing the second arm of the transmission crank arm to rotate in the opposite direction via the transmission connecting rod, realizing the opening operation. When the insulating pull rod moves to the open state, the transmission link and the support arm of the output crank arm are collinear and in a dead position. Through the constraint of the dead position of the mechanical structure, the opening rebound effect caused by the push rod hitting the oil buffer is reduced, thereby improving the opening stability and operational reliability of the circuit breaker.

[0041] Furthermore, when the insulating pull rod moves to the closed state, the transmission connecting rod is collinear with the second arm of the transmission crank arm.

[0042] The beneficial effect of the above technical solution is that it enables the transmission crank arm to reach its maximum acceleration at the moment of opening, thereby realizing the rapid movement of the transmission crank arm.

[0043] Furthermore, the opening and closing transmission structure also includes a pull rod connecting rod with one end for hinged to the insulating pull rod, and a fixed plate connecting rod with one end for hinged to the mechanism fixed plate. The other ends of the pull rod connecting rod and the fixed plate connecting rod are hinged to the push rod through the same pin. The first arm of the transmission crank arm, the push rod, the fixed plate connecting rod and the mechanism fixed plate form a parallelogram mechanism.

[0044] The beneficial effects of the above technical solution are as follows: the first arm of the transmission crank arm, the push rod, the fixed plate connecting rod and the mechanism fixed plate form a parallelogram mechanism. At the same time, each insulating pull rod is connected to a pull rod connecting rod, and each pull rod connecting rod is hinged to a fixed plate connecting rod. Therefore, two adjacent fixed plate connecting rods, push rods and mechanism fixed plates also form a parallelogram mechanism, which facilitates the control of the push plate's movement. In turn, the push plate controls the movement of the insulating pull rod through the pull rod connecting rod.

[0045] Furthermore, when the insulating pull rod moves to the closed state, the pull rod and the fixed plate pull rod are collinear with the insulating pull rod and are in a dead position.

[0046] The beneficial effects of the above technical solution are as follows: it can resist the reaction force of the contact spring outside the insulating pull rod, that is, the reaction force of the contact spring is shared by the dead point position of the pull rod connecting rod and the fixed plate connecting rod, and will not be transmitted to the output crank arm in the reverse through the push rod, transmission crank arm and transmission connecting rod. It can reduce the closing holding force of the closing stop in the closing holding assembly on the output crank arm, reduce the pressure on the closing stop, and extend the life of the closing stop.

[0047] Furthermore, a bushing is fitted around the hinge shaft between the fixed plate connecting rod and the mechanism fixed plate.

[0048] The beneficial effect of the above technical solution is to reduce wear and tear.

[0049] Furthermore, a tripping spring is connected between the push rod and the mechanism fixing plate to store energy during the closing process to provide power for the tripping. The connection position between the tripping spring and the push rod, and the connection position between the first arm of the transmission crank and the push rod, are located on both sides of the transmission connection position between the intermediate phase insulating pull rod and the push rod.

[0050] The advantages of the above technical solution are: reasonable layout and convenient installation.

[0051] Furthermore, one of the support arms of the output crank arm and the second support arm of the transmission crank arm has an elongated hinge hole for connecting with the transmission link.

[0052] The beneficial effect of the above technical solution is that it facilitates the change of shape of the transmission link and realizes the intermediate transmission function.

[0053] Furthermore, the portion of the operating mechanism output shaft that is rotatably coupled with the mechanism fixing plate is fitted with a bushing.

[0054] The beneficial effect of the above technical solution is to reduce wear and tear. Attached Figure Description

[0055] Figure 1 An isometric view of a circuit breaker in the open state, based on existing technology; Figure 2 This is a front view of the existing circuit breaker opening and closing transmission structure in the open state; Figure 3 This is a front view of the circuit breaker of the present invention in the closed state and with the energy storage spring not storing energy; Figure 4 for Figure 3 A front view of the circuit breaker's opening and closing transmission structure in the closed state when the energy storage spring is not stored. Figure 5 for Figure 4 A magnified view of a portion of region A in the middle; Figure 6 This is a front view of the circuit breaker of the present invention in the closed state and the energy storage spring has completed energy storage; Figure 7 for Figure 6 Enlarged view of a portion of the image; Figure 8 This is a front view of the circuit breaker of the present invention in the open state; Figure 9 This is a front view of the circuit breaker opening and closing transmission structure of the present invention in the open state; Figure 10 for Figure 9 A magnified view of a portion of region B in the middle; Figure 11 This is a partial isometric view of the circuit breaker opening and closing operating mechanism of the present invention in the closed state and the energy storage spring in the energy storage state; Figure 12 This is an isometric view of the closing holding component of the circuit breaker opening and closing operating mechanism of the present invention in the closed state; Figure 13 This is a partial isometric view of the circuit breaker opening and closing operating mechanism of the present invention in the open state.

[0056] In the diagram: 1. Vacuum interrupter; 2. Mechanism housing; 3. Mechanism fixing plate; 4. Oil buffer; 5. Opening spring; 6. Limit plate; 601. Limiting hole; 7. Insulating pull rod; 8. Push rod; 9. Output shaft assembly; 901. First arm of output crank arm; 902. Second arm of output crank arm; 903. Third arm of output crank arm; 904. Output shaft; 905. First roller; 906. Fourth roller; 10. Main shaft assembly; 1001. Cam; 1002. Main shaft pull rod; 1003. Main shaft; 1004. Locking arm; 1005. Third roller; 11. Pull rod connecting rod; 12. Fixing plate connecting rod; 13. Transmission crank arm; 1301. First arm of transmission crank arm; 1302. Transmission crank arm 14. Second arm; 15. Transmission link; 16. Closing holding assembly; 17. Closing stop; 18. Transition crank arm; 19. Opening stop; 20. Opening half shaft; 21. Second roller; 22. Energy storage spring assembly; 23. First contact spring; 24. Fourth contact spring; 25. Fifth contact spring; 26. Sixth contact spring; 27. Seventh contact spring. Detailed Implementation

[0057] To solve the above-mentioned technical problems, the basic technical concept of this invention is as follows: By hinged a transmission crank arm with two arms to the mechanism fixing plate, the first arm of the transmission crank arm is hinged to the push rod, and the second arm of the transmission crank arm is hinged to the output crank arm of the output shaft assembly through the transmission connecting rod. When the circuit breaker opening and closing operating mechanism opens, the transmission connecting rod and the arm of the output crank arm are collinear to form a dead point self-locking. It is difficult for the transmission connecting rod and the arm of the output crank arm to break the balance at the dead point position, so that the second arm of the transmission crank arm stops rotating. This reduces the opening rebound when the opening spring releases energy to pull the push rod to the opening position.

[0058] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0059] Specific embodiments of the circuit breaker provided by this invention: like Figure 3 , Figure 6 and Figure 8 As shown, the circuit breaker includes a circuit breaker body and a circuit breaker opening and closing operating mechanism. The circuit breaker body includes a three-phase vacuum interrupter 1. The circuit breaker opening and closing operating mechanism includes an operating mechanism body and a circuit breaker opening and closing transmission structure. The operating mechanism body includes a mechanism box 2 arranged below the three-phase vacuum interrupter 1. An oil buffer 4 for opening buffer is fixedly installed on one side of the mechanism box 2. The mechanism box 2 also has two mechanism fixing plates 3 arranged vertically and parallel to each other. The mechanism fixing plates 3 are used to support and fix the circuit breaker opening and closing operating mechanism, so as to control the separation and conduction of the moving contact and stationary contact in the three-phase vacuum interrupter 1 through the circuit breaker opening and closing operating mechanism, thereby realizing the opening and closing of the three-phase vacuum interrupter 1.

[0060] The operating mechanism body includes a main shaft assembly 10, an energy storage spring assembly 16 that is driven by the main shaft assembly 10, and an output shaft assembly 9 that is driven by the main shaft assembly 10. Insulating rods 7 are vertically guided and installed inside the three-phase vacuum interrupter chamber 1, and the circuit breaker opening and closing transmission structure is driven between the three insulating rods 7 and the output shaft assembly 9.

[0061] The circuit breaker's opening and closing transmission structure includes a push rod 8 that is simultaneously connected to the insulating pull rods 7 of the three-phase vacuum interrupter 1. The push rod 8 is horizontally arranged and located above the mechanism fixing plate 3. A opening spring 5 is connected between the push rod 8 and the mechanism fixing plate 3 to drive the three insulating pull rods 7 to drive the corresponding moving contacts to open the circuit. The opening spring 5 stores energy during the closing process to provide power for opening. Furthermore, the main shaft assembly 10 and the output shaft assembly 9 are arranged between the two mechanism fixing plates 3, and the energy storage spring assembly 16 and the opening spring 5 are installed on the outside of the two mechanism fixing plates 3. The opening spring 5 is inclined. If the three-phase vacuum interrupter 1 is defined as a left-middle-right arrangement, then one end of the opening spring 5 is connected to the upper left end of the mechanism fixing plate 3, and the other end is connected between the push rod 8 and the parts that are connected to the left insulating pull rod 7 and the middle insulating pull rod 7, and is closer to the part that is connected to the left insulating pull rod 7. The opening spring 5 gradually tilts downward from left to right.

[0062] Energy storage spring assembly 16 includes energy storage spring 1603 ( Figure 5 and Figure 10 As shown), Figure 3 , Figure 4 and Figure 5 As shown, at this time, the three-phase vacuum interrupter 1 is in the closed state and the energy storage spring 1603 is in the unstored state. Specifically, a limit plate 6 is provided above the mechanism fixing plate 3 inside the mechanism box 2. There are two limit plates 6, which are arranged at intervals, just like the mechanism fixing plate 3. Limit holes 601 are opened on the limit plates 6 at the lower ends of the three corresponding insulating pull rods 7. The limit holes 601 are elongated holes extending in the vertical direction.

[0063] The circuit breaker opening and closing transmission structure also includes a connecting rod 11 hinged at one end to the lower end of each insulating rod 7 via a first pin 21. The connecting rods 11 hinged to each insulating rod 7 are arranged in pairs and spaced apart. That is, the first pin 21 passes through both connecting rods 11 and the insulating rod 7 at the same time. The hinged parts of the two connecting rods 11 and the lower end of the insulating rod 7 are located between the two limiting plates 6. The two ends of the first pin 21 are respectively inserted into the limiting holes 601 of the two limiting plates 6. The vertical movement of the first pin 21 is guided by the limitation of the limiting holes 601, which in turn guides the vertical movement of the insulating rod 7.

[0064] The circuit breaker opening and closing transmission structure also includes a fixed plate connecting rod 12, one end of which is hinged to the mechanism fixed plate 3 via a third pin 23. The other ends of the pull rod connecting rod 11 and the fixed plate connecting rod 12 are hinged to the push rod via the same pin (i.e., the second pin 22). That is, the second pin 22 passes through the pull rod connecting rod 11, the fixed plate connecting rod 12 and the push rod 8, realizing the hinge of the three.

[0065] Similar to the pull rod 11, the fixed plate connecting rods 12 are also arranged in pairs. A pair of fixed plate connecting rods 12 are located on the front and rear sides of the push rod 8, respectively, and a pair of pull rod connecting rods 11 are also located on the front and rear sides of the push rod 8, respectively. Each insulating pull rod 7 is hinged to a pair of pull rod connecting rods 11, and each pair of pull rod connecting rods 11 is simultaneously hinged to the push rod 8 along with a pair of fixed plate connecting rods 12. Therefore, the two adjacent fixed plate connecting rods 12, the push rod 8, and the mechanism fixed plate 3 form a parallelogram mechanism, allowing the push rod 8 to spatially translate during the opening and closing process.

[0066] In this embodiment, the fixed plate connecting rod 12 and the pull rod connecting rod 11 are of equal length, resulting in a compact structure. In other embodiments, they may be of unequal length, for example, the length of the fixed plate connecting rod 12 may be greater than the length of the pull rod connecting rod 11.

[0067] Meanwhile, in this embodiment, a bushing is fitted around the hinge shaft (i.e., the third pin 23) of the fixed plate connecting rod 12 and the mechanism fixed plate 3. That is, the third pin 23 rotates with the hinge hole on the mechanism fixed plate 3 through the bushing to reduce the wear of the pin. In other embodiments, the third pin 23 can also rotate directly with the hinge hole on the mechanism fixed plate 3, thereby eliminating the need for the bushing.

[0068] The circuit breaker opening and closing transmission structure also includes a transmission crank arm 13 hinged to the mechanism fixing plate 3 via a fifth pin 25. The transmission crank arm 13 includes a first arm (i.e., the first transmission crank arm 1301) and a second arm (i.e., the second transmission crank arm 1302) arranged at an angle. The first transmission crank arm 1301 is hinged to the push rod 8 via a fourth pin 24. The first transmission crank arm 1301, the push rod 8, the fixing plate connecting rod 12, and the mechanism fixing plate 3 also form a parallelogram mechanism.

[0069] The connection positions of the opening spring 5 and the push rod 8, and the connection positions of the first support arm 1301 of the transmission crank arm and the push rod 8, are located on both sides of the transmission connection position between the intermediate phase insulating pull rod and the push rod 8, respectively, which facilitates the arrangement and connection of the opening spring 5 and the transmission crank arm 13. In other embodiments, if space permits, they can also be located between the transmission connection positions of the two phase insulating pull rods and the push rod 8.

[0070] The output shaft assembly 9 includes an output shaft 904. The circuit breaker opening and closing transmission structure also includes an output crank arm mounted on the output shaft 904 to prevent rotation. The output crank arm is a composite crank arm with three arms, specifically including a first output crank arm 901, a second output crank arm 902, and a third output crank arm 903. The circuit breaker opening and closing transmission structure also includes a transmission link 14, one end of which is hinged to the first output crank arm 901 and the other end of which is hinged to the second transmission crank arm 1302. The transmission link 14 is hinged to the second transmission crank arm 1302 via a sixth pin 26 and to the first output crank arm 901 via a seventh pin 27, thereby connecting the output shaft assembly 9 to the push rod 8.

[0071] The circuit breaker's opening and closing transmission structure comprises the pull rod 11, the fixed plate connecting rod 12, the push rod 8, the transmission crank arm 13, the transmission connecting rod 14, and the output crank arm. Specifically, the transmission crank arm 13 and the transmission connecting rod 14 are both arranged between the two mechanism fixed plates 3. The push rod 8 is reliably supported by the combined action of the fixed plate connecting rod 12 and the first support arm 1301 of the transmission crank arm, and can move smoothly to the right and downward and to the left and upward, thereby driving the insulating pull rod 7 to move smoothly up and down.

[0072] In addition, such as Figure 5 and Figure 10 As shown, the energy storage spring assembly 16 includes an energy storage spring 1603, with a first spring plate 1601 and a second spring plate 1602 connected to its two ends respectively. The main shaft assembly 10 includes a main shaft 1003, with a cam 1001 and a main shaft pull rod 1002 connected to the main shaft 1003 to prevent rotation. The third support arm 903 of the output crank arm is equipped with a first roller 905 for rolling and pressing with the cam 1001. The end of the main shaft pull rod 1002 facing away from the main shaft 1003 is connected to the first spring plate 1601, thereby drivingly connecting the energy storage spring assembly 16, the main shaft assembly 10, and the output shaft assembly 9.

[0073] Preferably, both the main shaft 1003 and the output shaft 904 are rotatably mounted on the mechanism fixing plate 3 via bushings to reduce friction on the main shaft 1003 and the output shaft 904 during rotation, thereby increasing their service life and improving the reliability of the circuit breaker's opening and closing operating mechanism. Of course, in other embodiments, the bushings can be omitted, and the main shaft and output shaft can directly rotate with the mechanism fixing plate.

[0074] The output crank arm is an integral structure, while the spindle pull rod 1002 and cam 1001 are respectively connected to the spindle 1003 by key anti-rotation, which can realize the convenient installation of the spindle pull rod 1002 and cam 1001 on the spindle 1003. When the spindle pull rod 1002 and cam 1001 are deformed or worn, the cam 1001 and spindle pull rod 1002 can be easily replaced.

[0075] In this embodiment, the first arm 901 of the output crank arm is hinged to the transmission link 14 via the seventh pin 27. The hinge hole on the first arm 901 of the output crank arm through which the seventh pin 27 passes is an elongated hole to facilitate the changing posture of the transmission link 14 and the transmission link 14 between the first arm 901 of the output crank arm and the second arm 1302 of the transmission crank arm. In other embodiments, the hinge hole on the second arm 1302 of the transmission crank arm through which the seventh pin 27 passes can also be an elongated hole. Of course, the hinge holes on both the second arm 1302 of the transmission crank arm and the first arm 901 of the output crank arm can also be round holes.

[0076] Of course, in other embodiments, the insulating pull rod 7 can also be directly connected to the push rod 8 via a crank arm with two supporting arms. Specifically, the crank arm can be hinged to the mechanism fixing plate 3, with the first supporting arm of the crank arm hinged to the insulating pull rod 7 and the second supporting arm of the crank arm hinged to the push rod 8. When the push rod 8 moves, the crank arm can rotate accordingly with the movement of the push rod 8, and drive the insulating pull rod 7 to move upward or downward through the first supporting arm of the crank arm.

[0077] In other embodiments, the spindle pull rod 1002 and the cam 1001 can also be connected to the spindle 1003 simultaneously using a key to prevent rotation, as long as the relative angle between the spindle pull rod 1002 and the cam 1001 can be guaranteed.

[0078] like Figures 3-5 The diagram shows the three-phase vacuum interrupter 1 in the closed state and the energy storage spring 1603 not storing energy. Figure 6 and Figure 7 The diagram shows the three-phase vacuum interrupter 1 in the closed state with the energy storage spring 1603 having completed energy storage. Figures 8-10 The diagram shows the three-phase vacuum interrupter 1 in the open state with the energy storage spring 1603 maintaining its energy storage state. It should be noted that... Figure 4 , Figure 5 , Figure 9 , Figure 10 The horizontal display of the energy storage spring 1603 is not its actual assembled state, but only a schematic diagram. It is a schematic diagram after the energy storage spring 1603 and the hanging plates at both ends are displayed separately.

[0079] Specifically, such as Figure 7As shown, a spring-hanging shaft 1604 is fixedly connected to the second spring-hanging plate 1602, and the second spring-hanging plate 1602 is symmetrically distributed about the spring-hanging shaft 1604. A rotating shaft 1605 is rotatably mounted on the mechanism fixing plate 3. A radial through hole is opened on the rotating shaft 1605, and the spring-hanging shaft 1604 is threaded into the radial through hole on the rotating shaft 1605. A motor 19 and a reduction gear assembly 20 with transmission connection are also mounted on the mechanism fixing plate 3. The main shaft 1003 is transmittedly connected to the reduction gear assembly 20 through the transmission gear.

[0080] During the process of the circuit breaker switching from open to closed, it closes first, then the energy storage spring 1603 stores energy, and after closing is completed, the energy storage spring 1603 is released from its original position. Figure 3 State transition Figure 6 and Figure 7 In the indicated state, the starter motor 19 drives the reduction gear assembly 20 to rotate, and transmits power to the main shaft 1003 through the transmission gear. Then, the clockwise rotation of the main shaft 1003 drives the main shaft tie rod 1002 to move away from the rotating shaft 1605, so that the energy storage spring 1603 can be stretched to store energy.

[0081] After the energy storage spring 1603 completes energy storage, an energy storage holding component 17 is also arranged in the mechanism box 2 to maintain the stretched energy storage state of the energy storage spring 1603. Figure 11 The diagram shows the state of the energy storage holding assembly 17 and the closing holding assembly 15 after the vacuum interrupter 1 is in the closed state and the energy storage spring 1603 has completed energy storage. Figure 13 The diagram shows the state of the vacuum interrupter 1 when it is open, but the energy storage spring 1603 is still in the energy storage state. Specifically, the energy storage holding assembly 17 includes a closing half-shaft 1702 and a closing stop 1701. The closing half-shaft 1702 has a circumferential surface on one side and a groove on the other side of the shaft section corresponding to the closing stop 1701.

[0082] When the energy storage spring 1603 is in the state of complete energy storage, the outer circumference of the closing half shaft 1702 limits and stops the closing stop 1701. The main shaft 1003 is also equipped with a locking arm 1004 to prevent rotation. The end of the locking arm 1004 is equipped with a third roller 1005. The other end of the closing stop 1701 stops and limits the third roller 1005, so that the main shaft 1003 cannot rotate clockwise, thereby keeping the energy storage spring 1603 in the energy storage state.

[0083] When closing is required, the closing half-shaft 1702 is rotated, allowing the closing stop 1701 to rotate along the groove on the closing half-shaft 1702. This prevents the other end of the closing stop 1701 from blocking the third roller 1005 of the locking arm 1004, allowing the energy storage spring 1603 connected to the main shaft tie rod 1002 via the first hanging spring plate 1601 to retract freely. This retracts the main shaft 1003 by rotating the locking arm 1004. The main shaft 1003 then drives the insulating tie rod 7 upward via the output shaft assembly 9 and the transmission structure, thus achieving synchronous closing of the three-phase vacuum interrupter 1.

[0084] Specifically, when the circuit breaker opening and closing operating mechanism is operated by... Figures 8-10 and Figure 13 The tripped state is transformed into Figures 3-5 In the closed state shown, the closing half-shaft 1702 is rotated to face the closing stop 1701 on the slotted side. At this time, the closing stop 1701 can rotate clockwise under the action of the torsion spring, thus losing its stop on the third roller 1005. The locking arm 1004 rotates clockwise under the tension of the energy storage spring 1603. The cam 1001, which is connected to the anti-rotation device of the main shaft 1003, rotates clockwise synchronously. Then, the cam 1001 pushes the first roller 905 on the third support arm 903 of the output crank arm, causing the output crank arm to rotate around the output crank arm. The output shaft 904 rotates counterclockwise, thereby causing the first arm 901 of the output crank arm to rotate counterclockwise and pull the transmission link 14 to move. The transmission link 14 drives the transmission crank arm 13 to rotate counterclockwise, causing the push rod 8 to move to the left and upward (i.e., move towards the side where the opening spring 5 is located, while stretching the opening spring 5). During the movement of the push rod 8, the fixed plate link 12 and the pull rod link 11, which are hinged to the push rod 8, rotate counterclockwise and clockwise respectively, and when the closing is completed, they rotate relative to each other to the dead point position collinear with the insulating pull rod 7.

[0085] Combination Figure 3 and Figure 4 When the closing operation is completed, the opening spring 5 is at its maximum extension length. Under the tension of the opening spring 5, the push rod 8 tends to move downwards and to the right, causing the transmission crank arm 13 to rotate clockwise, and consequently, the output shaft assembly 9 to rotate clockwise. Simultaneously, a contact spring 18 is coaxially mounted on the insulating pull rod 7. The contact spring 18 deforms under pressure during the closing process, so it also exerts a certain force on the push rod 8 after closing. To maintain the closed state and prevent the push rod 8 from moving downwards and pulling down the insulating pull rod 7, causing the circuit to open, a closing holding assembly 15 is also arranged inside the mechanism box 2. Figure 11 and Figure 12 As shown in the figure, the three-phase vacuum interrupter 1 is in the closed state and the closing holding component 15 is in the working state.

[0086] Specifically, the closing holding assembly 15 includes a tripping half shaft 1504, a tripping stop 1503, a transition crank arm 1502, and a closing stop 1501. On the shaft section of the tripping half shaft 1504 corresponding to the tripping stop 1503, one side is a circumferential surface and the other side is provided with a groove. A second roller 1505 is installed at one end of the transition crank arm 1502, and a closing stop 1501 is installed at the other end of the transition crank arm 1502. A fourth roller 906 is installed at the end of the second support arm 902 of the output crank arm. In the closed state, the fourth roller 906 presses against the closing stop 1501, and the closing stop 1501 generates a force on the transition crank arm 1502 to rotate clockwise. However, the second roller 1505 at the other end of the transition crank arm 1502 abuts against one end of the opening stop 1503. The other end of the opening stop 1503 is constrained by the circumferential surface of the opening half shaft 1504, which prevents the opening stop 1503 from rotating clockwise. Therefore, the output crank arm cannot rotate clockwise, and the operating mechanism remains in the closed state.

[0087] Therefore, when the operating mechanism is in the closed state, the reaction force from the contact spring 18 and the reaction force from the opening spring 5 ultimately act on the closing stop 1501 through the fourth roller 906, resulting in a very large force on the closing stop 1501, which is prone to damage. In this invention, the pull rod connecting rod 11 and the fixed plate connecting rod 12 are collinear with the insulating pull rod 7 and are at the dead point position when the insulating pull rod 7 moves to the closed state. Therefore, the reaction force of the contact spring 18 is shared by the dead point positions of the pull rod connecting rod 11 and the fixed plate connecting rod 12, and will not be transmitted to the output crank arm in the opposite direction through the push rod 8, the transmission crank arm 13, and the transmission connecting rod 14. This can reduce the closing holding force of the closing stop 1501 on the output crank arm in the closing holding assembly, reduce the load on the closing holding assembly, reduce the pressure on the closing stop 1501, extend the life of the closing stop 1501, and thus extend the life of the mechanism and the switch.

[0088] After the output crank arm rotates to the closing position and the closing stop 1501 abuts against the fourth roller 906 ( Figures 3-5 In the indicated state, the output crank arm no longer rotates, while the motor 19 continues to drive the main shaft 1003 to rotate clockwise via the reduction gear assembly 20. This causes the main shaft tie rod 1002 to move away from the rotating shaft 1605, allowing the energy storage spring 1603 to stretch and store energy. Figure 6 and Figure 7 As shown, the motor 19 stops outputting power. Under the force of the energy storage spring 1603, the third roller 1005 on the locking arm 1004 abuts against the closing stop 1701, restricting the rotation of the main shaft 1003. The energy storage spring 1603 remains in the energy storage state.

[0089] For the operating mechanism to open the circuit breaker, it must first control the opening half-shaft 1504 to rotate, so that the groove of the opening half-shaft 1504 aligns with the opening stop 1503, allowing the opening stop 1503 to rotate clockwise. This, in turn, allows the closing stop 1501 and the transition crank arm 1502 to rotate clockwise under the pressure of the fourth roller 906, thus disengaging the fourth roller 906. This allows the second arm 902 of the output crank arm, i.e., the entire output crank arm, to rotate clockwise, thereby achieving opening under the action of the opening spring 5. Figure 7 and Figure 11 The state shown Figure 8-10 The state shown.

[0090] Because the opening spring 5 is arranged at an angle, it directly applies a downward force to the push rod 8. Therefore, at the beginning of the opening process, under the force of the opening spring 5, the push rod 8 moves directly to the right and downward, breaking the dead point state of the pull rod connecting rod 11 and the fixed plate connecting rod 12. The push rod 8 drives the transmission crank arm 13 to rotate clockwise. The transmission crank arm 13 drives the first arm 901 of the output crank arm, that is, the entire output crank arm, to rotate clockwise through the transmission connecting rod 14 until the push rod 8 moves to the opening position.

[0091] During the tripping process, push rod 8 will still rebound under the action of tripping spring 5 and oil buffer 4, but when push rod 8 moves to the position... Figure 10 In the open position shown, the transmission link 14 and the first arm 901 of the output crank are collinear and at a dead point. Due to the limited stroke of the transmission link 14, the transmission crank 13 cannot continue to rotate clockwise and pull the transmission link 14. That is, the pulling force exerted by the transmission crank 13 on the transmission link 14 is exactly along the extension direction of the transmission link 14, preventing the transmission crank 13 from continuing to rotate clockwise. Simultaneously, under the rebound action of the push rod 8, if the transmission crank 13 were to rotate counterclockwise, it would need to overcome a large dead point force to break the dead point state between the transmission link 14 and the first arm 901 of the output crank, making it difficult for the transmission crank 13 to rotate counterclockwise. This weakens the opening rebound of the push rod 8, preventing the vacuum interrupter from reigniting when the distance between the moving contact and the stationary contact is less than the safe clearance at the open position, thus significantly improving the opening stability and operational reliability of the vacuum interrupter 1.

[0092] It should be noted that, due to the assembly clearance, the transmission crank arm 13 and the push rod 8 can still rebound slightly.

[0093] After the circuit breaker is tripped, the tripping spring 5 remains in a stretched state, and the three-phase vacuum interrupter 1 is kept in the tripped state by the tension of the tripping spring 5.

[0094] It should be noted that during the entire tripping process, since the closing stop 1701 remains in the state of abutting against the third roller 1005, the tripping force comes entirely from the tripping spring 5, the energy storage spring assembly 16 does not move, and the main shaft assembly 10 remains stationary.

[0095] It should also be noted that since the transition crank arm 1502 and the tripping stop 1503 are mounted on the mechanism fixing plate 3 by a pin and a torsion spring respectively, once the closing stop 1501 and the transition crank arm 1502 rotate clockwise to move aside the fourth roller 906 at the start of tripping, and the second arm 902 of the output crank arm rotates clockwise, the transition crank arm 1502 and the tripping stop 1503 can be reset under the action of the torsion spring. The closing stop 1501 is mounted on the transition crank arm 1502 via a pin and a torsion spring. The closing stop 1501 can rotate clockwise over the force of the torsion spring, but it cannot rotate counterclockwise after being pressed against the transition crank arm 1502. Therefore, when the operating mechanism closes the circuit again, when the cam 1001 pushes the first roller 905 on the third arm 903 of the output crank arm to make the output crank arm rotate counterclockwise, the fourth roller 906 can push the closing stop 1501 away, causing the closing stop 1501 to rotate clockwise and move aside. Once the fourth roller 906 rotates to disengage from the closing stop 1501 and reaches the closing position, the closing stop 1501 can be reset under the action of the torsion spring, thereby resisting the fourth roller 906 to achieve the closing holding function.

[0096] Specifically, the tripping half-shaft 1504 can be reset after the tripping stop 1503 is reset, preparing for the closing stop 1501 to abut against the fourth roller 906 during the next closing operation. Similarly, the closing stop 1701 can be reset after the third roller 1005 has passed, and the closing half-shaft 1702 can be reset after the closing stop 1701 is reset, preparing for the energy storage spring 1603 to abut against the third roller 1005 after storing energy next time.

[0097] In this embodiment, when the closing is completed, by making the insulating pull rod 7, the pull rod connecting rod 11, and the fixed plate connecting rod 12 collinear, the force exerted by the contact spring 18, which is coaxially mounted on the insulating pull rod 7, on the pull rod connecting rod 11 and the fixed plate connecting rod 12 is only the downward pressure along the axial direction of the insulating pull rod 7. Compared with the case where the pull rod connecting rod 11 and the fixed plate connecting rod 12 are not collinear when the closing is completed, the push rod 8 does not need to bear the lateral force from the contact spring 18, but only bears the tension from the opening spring 5. This can reduce the contact pressure that the closing stop 1501 needs to bear, thereby extending the service life of the closing stop 1501, reducing the accidental opening caused by the deviation of the closing position, and helping to improve the service life and reliability of the circuit breaker opening and closing operating mechanism.

[0098] In addition, while the pressure that the closing stop 1501 needs to withstand is reduced, the closing stop 1501 does not need to be provided with a large contact area, and the time for the closing stop 1501 to rotate and separate from the fourth roller 906 on the second arm 902 of the output crank arm can be shortened, thereby increasing the opening speed of the vacuum interrupter 1 and shortening the opening time.

[0099] At the same time, such as Figures 3-7 As shown, in the closed position, the transmission link 14 and the second arm 1302 of the transmission crank are collinear. When it is necessary to open the circuit, the opening spring 5 moves to the right and down by pulling the push rod 8, thereby driving the transmission crank 13 to rotate clockwise to break the collinearity between the second arm 1302 of the transmission crank and the transmission link 14. It does not need to bear the rotational resistance from the transmission link 14 on the second arm 1302 of the transmission crank. That is, the rotational resistance torque of the transmission crank 13 at the moment of opening is zero, and the rotational acceleration is at its maximum value, so as to realize the rapid action of the transmission crank 13 and shorten the opening time.

[0100] Similarly, Figures 8-10 As shown, when the circuit is open, since the transmission link 14 and the first arm 901 of the output crank arm are collinear, when the circuit needs to be closed, the output crank arm can be rotated counterclockwise to break the collinearity between the first arm 901 of the output crank arm and the transmission link 14. There is no need to overcome the rotational resistance applied to the first arm 901 of the output crank arm by the transmission link 14. This makes the rotational resistance torque of the output crank arm zero at the moment of closing, and the rotational acceleration at its maximum value, thus realizing the rapid action of the output crank arm and shortening the closing time.

[0101] The circuit breaker opening and closing transmission structure of this embodiment can ensure that the insulating rods 7 of the three-phase vacuum interrupter 1 move up and down synchronously, so that the transmission accuracy error of the three insulating rods 7 does not exceed 0.1mm, and the time difference between the opening and closing of the three-phase vacuum interrupter 1 does not exceed 2ms.

[0102] The circuit breaker opening and closing transmission structure of this embodiment is simple in structure and easy to assemble, and has a low failure rate. During closing, the collinearity of the pull rod 11, the fixed plate pull rod 12, and the insulating pull rod 7 is used to reduce the contact pressure that the closing holding assembly 15 needs to withstand. The collinearity of the transmission link 14 and the second support arm 1302 of the transmission crank arm is used to shorten the opening time and increase the opening speed. During opening, the collinearity of the transmission link 14 and the first support arm 901 of the output crank arm is used to reduce the opening rebound and increase the closing speed. This improves the deformation resistance and impact resistance of the circuit breaker opening and closing operating mechanism, and can effectively improve the reliability of the circuit breaker opening and closing operating mechanism.

[0103] In other embodiments, the pull rod 11 and the fixed plate rod 12 during closing may not be collinear, and the transmission rod 14 and the second support arm 1302 of the transmission crank arm may also not be collinear. The collinearity of the transmission rod 14 and the first support arm 901 of the output crank arm is only used during opening to reduce the opening rebound. That is, this embodiment only solves the problem of opening rebound.

[0104] Specific embodiments of the circuit breaker opening and closing operating mechanism provided by the present invention: The circuit breaker opening and closing operating mechanism includes an operating mechanism body and an opening and closing transmission structure. The opening and closing transmission structure is the same as the circuit breaker opening and closing transmission structure described in any of the above-mentioned circuit breaker embodiments, and will not be described in detail here.

[0105] Specific embodiments of the circuit breaker opening and closing transmission structure provided by the present invention: Specifically, the implementation method of the circuit breaker opening and closing transmission structure is the same as that described in any of the above-mentioned circuit breaker implementation methods, and will not be elaborated here.

[0106] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A circuit breaker opening and closing transmission structure, the transmission structure comprising a push rod for transmission connection with an insulating pull rod of a three-phase arc-extinguishing chamber and an output crank arm for mounting on the output shaft of an operating mechanism, characterized in that, It also includes a transmission crank arm for hinged to the mechanism fixing plate of the operating mechanism. The transmission crank arm includes a first arm and a second arm arranged at an angle. The first arm is hinged to the push rod. The transmission structure also includes a transmission link with one end hinged to the arm of the output crank arm and the other end hinged to the second arm. When the insulating pull rod moves to the open state, the transmission link is collinear with the arm of the output crank arm and is in a dead position.

2. The circuit breaker opening and closing transmission structure according to claim 1, characterized in that, When the insulated pull rod moves to the closed state, the transmission connecting rod is collinear with the second arm of the transmission crank arm.

3. The circuit breaker opening and closing transmission structure according to claim 1 or 2, characterized in that, The transmission structure also includes a pull rod connecting rod with one end for hinged to the insulating pull rod, and a fixed plate connecting rod with one end for hinged to the mechanism fixed plate. The other ends of the pull rod connecting rod and the fixed plate connecting rod are hinged to the push rod through the same pin. The first arm of the transmission crank arm, the push rod, the fixed plate connecting rod and the mechanism fixed plate form a parallelogram mechanism.

4. The circuit breaker opening and closing transmission structure according to claim 3, characterized in that, When the insulating pull rod moves to the closed state, the pull rod and the fixed plate pull rod are collinear with the insulating pull rod and are in a dead position.

5. The circuit breaker opening and closing transmission structure according to claim 3, characterized in that, A bushing is fitted around the hinge shaft between the fixed plate connecting rod and the mechanism fixed plate.

6. The circuit breaker opening and closing transmission structure according to claim 1 or 2, characterized in that, A tripping spring is connected between the push rod and the mechanism fixing plate to store energy during the closing process to provide power for the tripping. The connection position between the tripping spring and the push rod, and the connection position between the first arm of the transmission crank and the push rod are located on both sides of the transmission connection position between the intermediate phase insulating pull rod and the push rod.

7. The circuit breaker opening and closing transmission structure according to claim 1 or 2, characterized in that, One of the hinge holes of the output crank arm and the second crank arm of the transmission crank arm is an elongated hole that connects to the transmission link.

8. The circuit breaker opening and closing transmission structure according to claim 1 or 2, characterized in that, The part of the output shaft of the operating mechanism that is used to rotate with the mechanism fixing plate is fitted with a bushing.

9. A circuit breaker opening and closing operating mechanism, comprising an operating mechanism body and an opening and closing transmission structure, characterized in that, The circuit breaker opening and closing transmission structure is the circuit breaker opening and closing transmission structure as described in any one of claims 1 to 8.

10. A circuit breaker, comprising a circuit breaker body and a tripping / closing operating mechanism, wherein the tripping / closing operating mechanism comprises an operating mechanism body and a tripping / closing transmission structure, characterized in that, The circuit breaker opening and closing transmission structure is the circuit breaker opening and closing transmission structure as described in any one of claims 1 to 8.

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