An electrical switching device and operating mechanism therefor

Abstract

This utility model relates to the technical field of high-voltage switch operating mechanisms, specifically to an electrical switchgear and its operating mechanism. The operating mechanism of the electrical switchgear includes an input shaft, an output shaft, a transmission shaft, and a linkage. The transmission shaft is driven between the input and output shafts and is connected to the input shaft via a connecting shaft sleeve. The connecting shaft sleeve has transmission grooves at both ends. The input and transmission shafts each have transmission pins. When the input shaft drives the transmission and output shafts to rotate via the connecting shaft sleeve, the output shaft drives the connecting shaft sleeve axially via the linkage, causing the transmission pins of the input shaft and transmission shaft to disengage from the corresponding transmission grooves on the connecting shaft sleeve after the switch is closed and open, respectively, thus breaking the transmission path. After the motor cuts off the power, the input shaft can continue to rotate under inertial force, releasing energy. This mechanical tripping structure is reliable, not prone to failure, and contributes to long-term stability.

Description

Technical Field

[0001] This utility model relates to the technical field of high-voltage switch operating mechanisms, specifically to an electrical switchgear and its operating mechanism. Background Technology

[0002] High-voltage switches, such as circuit breakers and disconnectors, achieve opening and closing actions through operating mechanisms. During the opening and closing operation, the electric operating mechanism receives opening and closing signals from the control cabinet to control the motor to rotate, driving the mechanical transmission structure to achieve the opening and closing action. Rotation stops after the high-voltage switch is in position. Existing electric operating mechanisms use mechanical limiters at the end of the main drive system to achieve a fixed-angle output, limiting the rotation angle of the output shaft. After rotation to the desired position, the motor's power is cut off. However, the motor tends to continue rotating due to inertia after the power is cut off. Currently, an electric brake is used to brake the motor after the high-voltage switch is operated to the desired position. However, this method is prone to failure after long-term use and numerous operations. This results in the motor's residual energy not being released after the high-voltage switch cuts off the motor's power, causing the motor to stall and burn out. Utility Model Content

[0003] The purpose of this utility model is to provide an operating mechanism for an electrical switchgear, so as to solve the problem that the residual energy of the current electric operating mechanism after the power is cut off after the electric brake release is in place is prone to failure after long-term use, resulting in motor damage; the purpose of this utility model is also to provide an electrical switchgear to solve the above problems.

[0004] The technical solution of the operating mechanism of the electrical switchgear of this utility model is as follows: An operating mechanism for an electrical switchgear includes an input shaft driven by a motor and an output shaft driven by a switch body. It also includes a transmission shaft and a linkage. The transmission shaft is driven between the input and output shafts and is connected to the input shaft via a connecting sleeve. The connecting sleeve has transmission grooves at both ends. The input and transmission shafts each have transmission pins that engage with the corresponding transmission grooves on the connecting sleeve. The openings of the transmission grooves have portions for circumferentially stopping the transmission pins. The linkage is driven by the output shaft. The connecting sleeve is rotatable relative to the linkage and is axially limited. When the input shaft drives the transmission shaft and output shaft to rotate via the connecting sleeve, the output shaft drives the connecting sleeve to move axially, causing the transmission pins of the input shaft and transmission shaft to disengage from the corresponding transmission grooves on the connecting sleeve after the switch is closed and open, respectively, thus breaking the transmission path.

[0005] Furthermore, the end face of the transmission groove of the connecting shaft cylinder is a helical surface. The transmission groove passes through the connecting shaft cylinder in the radial direction. The transmission groove has a long side groove wall and a short side groove wall that are opposite each other in the circumferential direction of the connecting shaft cylinder. The axial extension length of the long side groove wall along the connecting shaft cylinder is greater than the axial extension length of the short side groove wall along the connecting shaft cylinder. The input shaft and the transmission shaft extend into the connecting shaft cylinder. The part of the long side groove wall that extends beyond the short side groove wall constitutes the part at the groove opening for circumferential blocking with the transmission pin so that the connecting shaft cylinder can move axially relative to the transmission pin when blocked.

[0006] Furthermore, a linkage gear is installed on the output shaft, and a linkage rack is provided on the linkage body. The linkage gear and the linkage rack cooperate to make the output shaft rotate and drive the connecting shaft cylinder to move linearly.

[0007] Furthermore, the linkage body includes a separate linkage plate and a tripping linkage component. Both the linkage plate and the tripping linkage component are guided and movably mounted on the frame of the operating mechanism. The linkage plate is connected to the output shaft for transmission, and the tripping linkage component is connected to the connecting shaft cylinder. The linkage plate is provided with a top block for pushing the tripping linkage component to move.

[0008] Furthermore, there are two top blocks that are spaced apart along the axial direction of the connecting shaft cylinder. The tripping linkage has a push-supporting protrusion located between the two top blocks. One top block is used to push the push-supporting protrusion when the circuit is open, and the other top block is used to push the push-supporting protrusion when the circuit is closed. The distance between the two top blocks is greater than the width of the push-supporting protrusion along the moving direction of the connecting shaft cylinder.

[0009] Furthermore, the top block is mounted in an adjustable position on the linkage plate.

[0010] Furthermore, the frame of the operating mechanism is provided with a guide structure for guiding the linear motion of the linkage body. The guide structure includes a guide post disposed around the connecting shaft cylinder, and the linkage body has a through hole for the guide post to pass through.

[0011] Furthermore, a return spring is fitted on the guide post, with one end of the return spring pressing against the frame and the other end pressing against the linkage.

[0012] Furthermore, the linkage includes a limiting connecting plate that is sleeved on the connecting shaft cylinder. The connecting shaft cylinder is provided with a groove that cooperates with the limiting connecting plate to allow the connecting shaft cylinder to rotate relative to the linkage and maintain an axial relative position. The guide post passes through the limiting connecting plate, and the return spring is fitted on the portion of the guide post located on both sides of the limiting connecting plate.

[0013] Beneficial Effects: This utility model improves the operating mechanism of existing electrical switchgear. By setting up a linkage between the input shaft and the output shaft through a connecting shaft cylinder and a linkage body, a linkage tripping transmission structure is formed. When the circuit is open, one of the transmission pins on the input shaft and the transmission pin on the transmission shaft disengages from the transmission groove of the connecting shaft cylinder, while the other extends into the bottom of the transmission groove of the connecting shaft cylinder. The reverse is true when the circuit is closed. During the opening and closing operations, the motor drives the input shaft to rotate. The transmission pin of the input shaft engages with the transmission groove of the connecting shaft cylinder to prevent rotation, and the transmission pin of the transmission shaft engages with the transmission groove of the connecting shaft cylinder to prevent rotation, causing the transmission shaft to rotate, which in turn drives the output shaft to rotate. The opening and closing action of the switch body drives the linkage to move while the output shaft rotates. The linkage drives the connecting shaft cylinder to move axially, and the transmission pin slides in the corresponding transmission groove. When the motor rotates forward, the connecting shaft cylinder can move forward, and when the motor rotates in reverse, the connecting shaft cylinder can move in reverse. Thus, when the switch is in the open or closed position, a transmission pin can disengage from the corresponding transmission groove to achieve tripping, the transmission path is broken, and after the motor cuts off the power, the input shaft can continue to rotate under the action of inertial force to release energy. This mechanical position tripping structure is reliable, not easy to fail, and conducive to long-term stability.

[0014] The technical solution of the electrical switchgear of this utility model is as follows: An electrical switchgear includes a switch body and an operating mechanism. The operating mechanism includes an input shaft connected to a motor and an output shaft connected to the switch body. It also includes a transmission shaft and a linkage. The transmission shaft is connected between the input shaft and the output shaft and is connected to the input shaft via a connecting sleeve. The connecting sleeve has transmission grooves at both ends. The input shaft and the transmission shaft are each provided with a transmission pin that engages with the corresponding transmission groove of the connecting sleeve. The opening of the transmission groove has a part for circumferentially stopping the transmission pin. The linkage is connected to the output shaft. The connecting sleeve is rotatable relative to the linkage and is axially limited. When the input shaft drives the transmission shaft and the output shaft to rotate via the connecting sleeve, the output shaft drives the connecting sleeve to move axially so that the transmission pins of the input shaft and the transmission shaft disengage from the corresponding transmission grooves of the connecting sleeve after the switch is closed and the switch is open, respectively, thus breaking the transmission path.

[0015] Furthermore, the end face of the transmission groove of the connecting shaft cylinder is a helical surface. The transmission groove passes through the connecting shaft cylinder in the radial direction. The transmission groove has a long side groove wall and a short side groove wall that are opposite each other in the circumferential direction of the connecting shaft cylinder. The axial extension length of the long side groove wall along the connecting shaft cylinder is greater than the axial extension length of the short side groove wall along the connecting shaft cylinder. The input shaft and the transmission shaft extend into the connecting shaft cylinder. The part of the long side groove wall that extends beyond the short side groove wall constitutes the part at the groove opening for circumferential blocking with the transmission pin so that the connecting shaft cylinder can move axially relative to the transmission pin when blocked.

[0016] Furthermore, a linkage gear is installed on the output shaft, and a linkage rack is provided on the linkage body. The linkage gear and the linkage rack cooperate to make the output shaft rotate and drive the connecting shaft cylinder to move linearly.

[0017] Furthermore, the linkage body includes a separate linkage plate and a tripping linkage component. Both the linkage plate and the tripping linkage component are guided and movably mounted on the frame of the operating mechanism. The linkage plate is connected to the output shaft for transmission, and the tripping linkage component is connected to the connecting shaft cylinder. The linkage plate is provided with a top block for pushing the tripping linkage component to move.

[0018] Furthermore, there are two top blocks that are spaced apart along the axial direction of the connecting shaft cylinder. The tripping linkage has a push-supporting protrusion located between the two top blocks. One top block is used to push the push-supporting protrusion when the circuit is open, and the other top block is used to push the push-supporting protrusion when the circuit is closed. The distance between the two top blocks is greater than the width of the push-supporting protrusion along the moving direction of the connecting shaft cylinder.

[0019] Furthermore, the top block is mounted in an adjustable position on the linkage plate.

[0020] Furthermore, the frame of the operating mechanism is provided with a guide structure for guiding the linear motion of the linkage body. The guide structure includes a guide post disposed around the connecting shaft cylinder, and the linkage body has a through hole for the guide post to pass through.

[0021] Furthermore, a return spring is fitted on the guide post, with one end of the return spring pressing against the frame and the other end pressing against the linkage.

[0022] Furthermore, the linkage includes a limiting connecting plate that is sleeved on the connecting shaft cylinder. The connecting shaft cylinder is provided with a groove that cooperates with the limiting connecting plate to allow the connecting shaft cylinder to rotate relative to the linkage and maintain an axial relative position. The guide post passes through the limiting connecting plate, and the return spring is fitted on the portion of the guide post located on both sides of the limiting connecting plate.

[0023] Beneficial Effects: This utility model improves the operating mechanism of existing electrical switchgear. By setting up a linkage between the input shaft and the output shaft through a connecting shaft cylinder and a linkage body, a linkage tripping transmission structure is formed. When the circuit is open, one of the transmission pins on the input shaft and the transmission pin on the transmission shaft disengages from the transmission groove of the connecting shaft cylinder, while the other extends into the bottom of the transmission groove of the connecting shaft cylinder. The reverse is true when the circuit is closed. During the opening and closing operations, the motor drives the input shaft to rotate. The transmission pin of the input shaft engages with the transmission groove of the connecting shaft cylinder to prevent rotation, and the transmission pin of the transmission shaft engages with the transmission groove of the connecting shaft cylinder to prevent rotation, causing the transmission shaft to rotate, which in turn drives the output shaft to rotate. The opening and closing action of the switch body drives the linkage to move while the output shaft rotates. The linkage drives the connecting shaft cylinder to move axially, and the transmission pin slides in the corresponding transmission groove. When the motor rotates forward, the connecting shaft cylinder can move forward, and when the motor rotates in reverse, the connecting shaft cylinder can move in reverse. Thus, when the switch is in the open or closed position, a transmission pin can disengage from the corresponding transmission groove to achieve tripping, the transmission path is broken, and after the motor cuts off the power, the input shaft can continue to rotate under the action of inertial force to release energy. This mechanical position tripping structure is reliable, not easy to fail, and conducive to long-term stability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of an embodiment of the operating mechanism of the electrical switchgear of this utility model; Figure 2 for Figure 1 A schematic diagram of the installation structure of the connecting shaft cylinder of the operating mechanism; Figure 3 for Figure 1 A schematic diagram of the linkage structure of the operating mechanism in the middle; Figure 4 for Figure 3 A schematic diagram of the operating mechanism in the circuit when the circuit is closed; Figure 5 for Figure 3 A schematic diagram of the operating mechanism when the circuit breaker is in the trip position.

[0025] In the diagram: 101, front plate; 102, rear plate; 103, limit block; 11, drive motor; 12, motor gear; 21, input shaft; 22, transmission gear; 31, connecting shaft sleeve; 311, input transmission pin; 312, output transmission pin; 313, input transmission groove; 314, output transmission groove; 41, transmission shaft; 51, worm gear; 52, limit pin; 61, output shaft; 62, linkage gear; 70, linkage rack; 71, linkage plate; 72, closing top block; 73, opening top block; 81, tripping linkage component; 82, push-support protrusion; 91, reset spring. Detailed Implementation

[0026] The basic concept of the operating mechanism of this utility model for electrical switchgear is to set a releaseable connecting cylinder between the input shaft and the transmission shaft, so that the output shaft is linked with the connecting cylinder. After the switch is opened or closed, the connecting cylinder moves to disconnect the transmission path. In this way, after the mechanical limit structure of the operating mechanism forms a stop, it will not prevent the input shaft from continuing to rotate. Thus, the residual energy of the motor connected to the input shaft after the power is cut off is released through inertial rotation. This linkage structure that uses mechanical release to disconnect the transmission path is reliable and conducive to stability during long-term use.

[0027] The following detailed description is provided in conjunction with specific embodiments. An embodiment of the operating mechanism of the electrical switchgear of this utility model: like Figure 1 , Figure 2 As shown, the operating mechanism of the electrical switchgear includes a frame, a drive motor 11, an input shaft 21, a transmission shaft 41, and an output shaft 61. The frame includes a front plate 101 and a rear plate 102 as mounting plates for mounting corresponding components. The drive motor 11 is mounted on the frame and constitutes an electric motor as a power source. The drive motor 11 is located below the input shaft 21, and the output shaft 61 is located above the input shaft 21 and is arranged vertically. The axial direction of the input shaft 21 is defined as the left-right direction, and the axial direction of the output shaft 61 is defined as the front-back direction. The input shaft 21 and the transmission shaft 41 are rotatably mounted on the frame, and the output shaft 61 is rotatably mounted on the front plate 101 and the rear plate 102.

[0028] The motor shaft of the drive motor 11 is parallel to the input shaft 21. A motor gear 12 is installed at the end of the motor shaft. A transmission gear 22 that meshes with the motor gear 12 is installed on the input shaft 21. The left end of the input shaft 21 is connected to the transmission shaft 41, and the right end of the input shaft 21 can be used as a manual operation input. A part of the transmission shaft 41 is a worm gear. A worm wheel 51 is installed on the output shaft 61. The worm wheel 51 is located between the front plate 101 and the rear plate 102. A limit pin 52 is provided on the front end face of the worm wheel 51. A limit block 103 is fixed on the rear side of the front plate 101 of the frame. The limit block 103 and the limit pin 52 cooperate to form a mechanical limit. When the circuit is open, the limit block 103 moves with the rotation of the worm wheel 51 to one side in the left-right direction and stops. When the circuit is closed, the limit block 103 moves with the rotation of the worm wheel 51 to the other side in the left-right direction and stops. The drive motor 11 rotates forward and reverse to achieve the opening and closing of the circuit breaker.

[0029] When the switch is fully open, the moving and stationary contacts of the switch body have sufficient insulation distance. When the switch is fully closed, the moving and stationary contacts of the switch body are effectively connected. To avoid the problem that the electric operating mechanism cannot stop rotating immediately after the motor power is cut off after the switch is fully open or closed, and that the existing electric braking structure cannot meet the reliability requirements, resulting in the motor being prone to burnout due to the inability to release residual energy, a structure that can realize the tripping of the transmission system is designed. This ensures that the motor is disengaged from the main transmission system after the switch is fully open or closed. During the closing and opening operations, the motor is connected to the main transmission system, forming a closed-loop tripping structure. The tripping structure is connected in parallel at both ends of the path of the main transmission system. After the switch is fully open or closed, the tripping is triggered, causing the motor to disengage from the main transmission system.

[0030] The components used to form the tripping structure include a connecting shaft cylinder 31, a linkage plate 71, and a tripping linkage component 81. The linkage plate 71 and the tripping linkage component 81 form a linkage body. The transmission shaft 41 is connected to the input shaft 21 via the connecting shaft cylinder 31. The two axial ends of the connecting shaft cylinder 31 are respectively connected to the transmission shaft 41 and the input shaft 21. When the drive motor 11 is running, it can drive the input shaft 21, the connecting shaft cylinder 31, the transmission shaft 41, the worm, the worm wheel 51, and the output shaft 61 to rotate. The rear end of the output shaft 61 is connected to the switch body to enable its contacts to open and close.

[0031] Combination Figure 3 The connecting shaft cylinder 31 has transmission grooves at both ends. The transmission groove at the right end is the input transmission groove 313, and the transmission groove at the left end is the output transmission groove 314. The input shaft 21 and the transmission shaft 41 are respectively provided with transmission pins for cooperating with the corresponding transmission grooves at the ends of the connecting shaft cylinder 31. The transmission pin at the right end is the input transmission pin 311, and the transmission pin at the left end is the output transmission pin 312. The groove opening is provided with a part for circumferentially stopping the transmission pin. The linkage is connected to the output shaft 61. The connecting shaft cylinder 31 is rotatable relative to the linkage and is axially limited. When the input shaft 21 drives the transmission shaft 41 and the output shaft 61 to rotate through the connecting shaft cylinder 31, the output shaft 61 drives the connecting shaft cylinder 31 to move axially through the linkage so that the input transmission pin 311 and the output transmission pin 312 disengage from the corresponding transmission grooves at the ends of the connecting shaft cylinder 31 after the circuit is closed and the circuit is opened, respectively, thus disconnecting the transmission path.

[0032] When the motor rotates forward, the connecting shaft cylinder 31 can move forward; when the motor rotates in reverse, the connecting shaft cylinder 31 can move in the opposite direction. Thus, when the circuit is open or closed, a transmission pin can disengage from the corresponding transmission groove, achieving tripping and breaking the transmission path. After the motor is powered off, the input shaft 21 can continue to rotate under inertial force, releasing energy. This mechanical tripping structure is reliable, not prone to failure, and contributes to long-term stability. In this embodiment, as shown... Figure 4 and Figure 5As shown, from the right-hand perspective, the process from closing to opening is the input shaft 21 rotating counterclockwise, and the process from opening to closing is the input shaft 21 rotating clockwise. Of course, the rotation direction and the correspondence between opening and closing can also be set in the opposite way as needed.

[0033] The input shaft 21 and the drive shaft 41 extend into the connecting shaft cylinder 31. When the input drive pin 311 and the input drive groove 313 are not in anti-rotation engagement, the input shaft 21 can rotate freely relative to the connecting shaft cylinder 31. When the output drive pin 312 and the output drive groove 314 are not in anti-rotation engagement, the drive shaft 41 can rotate freely relative to the connecting shaft cylinder 31. The end face of the transmission groove of the connecting shaft cylinder 31 is a helical surface. The transmission groove runs radially through the connecting shaft cylinder 31 and has long and short side walls that are opposite each other circumferentially along the connecting shaft cylinder 31. The axial extension length of the long side wall along the connecting shaft cylinder 31 is greater than that of the short side wall. The portion of the long side wall that extends beyond the short side wall forms the groove opening, which is used to stop the transmission pin circumferentially. When the connecting shaft cylinder 31 rotates relative to the transmission pin to the stop, the transmission path is connected. At this time, the output shaft 61 can rotate, thereby driving the linkage to move. The linkage moves axially relative to the connecting shaft cylinder 31 as it rotates, causing the transmission pin to move along the transmission groove. The connecting shaft cylinder 31 can reciprocate during opening and closing operations. The helical surface makes the two side walls of the transmission groove different lengths, thus forming the part that matches the transmission pin, which is convenient for machining. At the same time, after the transmission pin leaves the transmission groove, it can slide and rub along the helical surface, which helps to release residual energy. In other embodiments, the end face of the connecting shaft cylinder can also be configured as a planar structure, with a protrusion on one side of the groove opening of the transmission groove to form a part for the transmission pin to stop and engage.

[0034] Combination Figure 1 A linkage gear 62 is mounted at the front end of the output shaft 61, and a linkage rack 70 is provided on the linkage body. The linkage gear 62 and the linkage rack 70 cooperate to cause the connecting shaft cylinder 31 to move linearly through the linkage body when the output shaft 61 rotates. The gear and rack structure converts the rotational motion into linear motion, realizing the linkage between the output shaft 61 and the connecting shaft cylinder 31. The structure is compact and saves space. In other embodiments, a transmission arm can also be provided on the output shaft. The transmission arm has an elongated hole, and a transmission column extending into the elongated hole is provided on the linkage body. When the transmission arm swings with the output shaft, the linkage body moves linearly through the elongated hole and the transmission column.

[0035] The linkage plate 71 and the trip linkage component 81 of the linkage body are separately arranged. Both the linkage plate 71 and the trip linkage component 81 are guided and movable on the frame of the operating mechanism. This can be achieved by setting guide pins on the front plate 101 and setting guide elongated holes on the linkage plate 71 and the trip linkage component 81 to cooperate with the guide pins. The guiding movement direction of the linkage plate 71 and the trip linkage component 81 is the same as the movement direction of the connecting shaft cylinder 31. The linkage rack 70 is set on the linkage plate 71 to enable the linkage plate 71 to be connected to the output shaft 61 for transmission. The trip linkage component 81 is connected to the connecting shaft cylinder 31. The linkage plate 71 is provided with a top block for pushing the trip linkage component 81 to move, which can simplify the structure of the linkage body and facilitate manufacturing. In other embodiments, the linkage body can also be a one-piece structure.

[0036] There are two top blocks: a closing top block 72 and a closing top block 73. The two top blocks are spaced apart along the axial direction of the connecting shaft cylinder 31. The tripping linkage 81 has a push-supporting protrusion 82 located between the two top blocks. The closing top block 73 is used to push the push-supporting protrusion 82 when the circuit is open, and the closing top block 72 is used to push the push-supporting protrusion 82 when the circuit is closed. The distance between the two top blocks is greater than the width of the push-supporting protrusion 82 along the moving direction of the connecting shaft cylinder 31. Thus, when the linkage plate 71 moves from the left limit position to the right limit position, the right top block needs to move a distance equal to the distance between itself and the push-supporting protrusion 82 before it can push the push-supporting protrusion 82. The same applies to the opposite direction, meaning there is a period of idle travel. During the idle stroke, the output shaft 61 rotates normally and the linkage plate 71 moves normally, but it will not drive the trip linkage 81 to move. That is, no tripping action is performed during the idle stroke. At this time, the input shaft 21 and the transmission shaft 41 only cooperate to prevent rotation and perform rotational transmission. When the circuit is about to be closed or opened, the push block presses against the push protrusion 82, and then the axial movement of the connecting shaft cylinder 31 is performed to perform the tripping action. After it is fully in place, the corresponding transmission pin is disengaged from the corresponding transmission groove. In this way, the connecting shaft cylinder 31 does not need to be set very long to meet the tripping requirements. The axial tripping movement of the connecting shaft cylinder 31 is adapted to the opening and closing rotation action of the output shaft 61. The structure is compact and saves space.

[0037] Both the closing top block 72 and the opening top block 73 are adjustablely mounted on the plate of the linkage plate 71. Their positions can be adjusted and fixed by bolts through elongated holes. By adjusting the position of the top block, it is easy to accurately adjust the timing of the top block and the push-support protrusion 82. In other embodiments, the top block can also be welded and fixed in place at one time.

[0038] The operating mechanism's frame is equipped with a guide structure to guide the linear motion of the linkage. The tripping linkage 81 is a bent plate structure, with part of the plate having a push-support protrusion 82 to cooperate with the linkage plate 71, and part of the plate cooperating with the connecting shaft cylinder 31. The guide structure includes guide posts disposed around the connecting shaft cylinder 31, and the tripping linkage 81 has through holes for the guide posts to pass through. Figure 3Two guide posts are provided between the mounting base for mounting the drive shaft 41 and the mounting base for mounting the input shaft 21. The two guide posts are respectively arranged on the upper and lower sides of the connecting shaft cylinder 31. Part of the plate of the trip linkage 81 is sleeved on the guide post to maintain its axial movement. A return spring 91 is sleeved on the guide post to enable the trip linkage 81 to have the ability to reset when it is not pushed.

[0039] One end of the return spring 91 presses against the corresponding mounting base on the frame, and the other end presses against the tripping linkage 81. Part of the tripping linkage 81 is a limiting connecting plate that fits onto the connecting shaft cylinder 31. A guide post passes through the limiting connecting plate, and return springs 91 are fitted onto the portions of the guide post located on both sides of the limiting connecting plate. The middle of the connecting shaft cylinder 31 has a groove that mates with the limiting connecting plate, allowing the connecting shaft cylinder 31 to rotate relative to the linkage body while maintaining its axial relative position. The connecting shaft cylinder 31 can rotate relative to the tripping linkage 81, but their axial positions remain relatively fixed.

[0040] Operating mechanism operating principle: The control cabinet sends a closing signal. Upon receiving the closing signal, the operating mechanism must... Figure 5 The tripping state transitions to... Figure 4In the closed state, at the initial state of the mechanism, the output transmission pin 312 is disengaged from the output transmission groove 314, the input transmission pin 311 is in the input transmission groove 313, the opening push block is in the push-off release linkage 81 is in the right limit position, and the right-side return spring 91 is compressed; the drive motor 11 drives the motor gear 12 to rotate, which in turn drives the input shaft 21 to rotate through gear meshing. The input shaft 21 drives the connecting shaft cylinder 31 to rotate through the input transmission pin 311. When the output transmission pin 312 on the transmission shaft 41 engages with the output transmission pin 31 on the connecting shaft cylinder 31, the mechanism is in operation. When the long side wall of slot 314 is stopped at the slot opening, the input shaft 21 drives the transmission shaft 41 to rotate via the connecting shaft sleeve 31. The transmission shaft 41 drives the output shaft 61 to rotate, performing the closing action. During this process, the output shaft 61 drives the linkage plate 71 to move to the left via the gear and rack mechanism, and the opening push block moves to the left accordingly. Under the action of the right-side reset spring 91, the trip linkage 81 moves to the left, causing the output transmission pin 312 to enter the output transmission slot 314. When the trip linkage 81 moves to the middle position, the right-side closing push block has not yet contacted the push-bearing protrusion. As the input shaft 21 continues to rotate, the tripping linkage 81 temporarily stops moving, while the connecting shaft cylinder 31 rotates relative to it, continuing the closing action. With continued rotation, the linkage plate 71 gradually moves to the left. When the right closing push block abuts the pusher 82, the closing is almost complete. As the linkage plate 71 continues to move to the left, the closing push block pushes the pusher 82 to the left, causing the tripping linkage 81 to move to the left, which in turn causes the connecting shaft cylinder 31 to move to the left relative to the input shaft 21, thus changing the input transmission... Pin 311 moves toward the slot of input transmission groove 313, and the left return spring 91 is compressed. When the closing position is reached, the closing push block is at the left limit position, and the input transmission pin 311 disengages from the short side wall of the input transmission groove 313. At this time, if the input shaft 21 continues to rotate, it will no longer drive the connecting shaft cylinder 31, realizing the function of disengaging the motor from the main transmission system after the operating mechanism is in place. In this way, the residual energy after the motor is cut off from the power supply can be released without being limited by the mechanical stop limit of the limit block 103 and the limit pin 52. The motor idles to release the residual energy.

[0041] Because the two ends of the connecting shaft cylinder 31 have a helical inclination angle, when the input shaft 21 continues to rotate due to residual energy, the input transmission pin 311 of the input shaft 21 will be misaligned with the input transmission groove 313 and move along the helical surface, pressing against the helical surface to make the tripping linkage 81 continue to move to the left. In this way, the friction between the transmission pin and the helical surface and the compression of the return spring 91 can be used to absorb the residual energy.

[0042] Similarly, the process of tripping the circuit breaker is the reverse of the above, and will not be repeated here.

[0043] This operating mechanism prevents motor brake failure and subsequent stalling and burnout after the high-voltage switch has reached its operating position, thus improving product reliability. Using this tripping structure eliminates the need for an electric brake, although it can also be added for double protection.

[0044] Embodiments of the electrical switchgear of this utility model: Electrical switching equipment can be either a disconnecting switch or a circuit breaker. Electrical switching equipment includes a switch body and an operating mechanism, which is the same as the operating mechanism of the electrical switching equipment in the above embodiments, and will not be described again here.

[0045] Finally, it should be noted that the above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An operating mechanism for an electrical switchgear, comprising an input shaft drivenly connected to a motor and an output shaft drivenly connected to the switch body, characterized in that, It also includes a drive shaft and a linkage. The drive shaft is connected between the input shaft and the output shaft, and is connected to the input shaft via a connecting sleeve. The connecting sleeve has a drive groove at each end. The input shaft and the drive shaft are each provided with a drive pin for engaging with the corresponding drive groove of the connecting sleeve. The groove opening is provided with a part for circumferentially stopping the drive pin. The linkage is connected to the output shaft. The connecting sleeve is rotatable relative to the linkage and is axially limited. When the input shaft drives the drive shaft and the output shaft to rotate through the connecting sleeve, the output shaft drives the connecting sleeve to move axially through the linkage so that the drive pin of the input shaft and the drive pin of the drive shaft disengage from the corresponding drive groove of the connecting sleeve after the switch is closed and the switch is open, respectively, thus breaking the transmission path.

2. The operating mechanism of the electrical switchgear according to claim 1, characterized in that, The end face of the transmission groove of the connecting shaft cylinder is a helical surface. The transmission groove runs through the connecting shaft cylinder in the radial direction. The transmission groove has a long side groove wall and a short side groove wall that are opposite each other in the circumferential direction of the connecting shaft cylinder. The axial extension length of the long side groove wall along the connecting shaft cylinder is greater than the axial extension length of the short side groove wall along the connecting shaft cylinder. The input shaft and the transmission shaft extend into the connecting shaft cylinder. The part of the long side groove wall that extends beyond the short side groove wall constitutes the part at the groove opening that is used to stop the transmission pin circumferentially so that the connecting shaft cylinder can move axially relative to the transmission pin when stopped.

3. The operating mechanism of the electrical switchgear according to claim 1 or 2, characterized in that, A linkage gear is installed on the output shaft, and a linkage rack is provided on the linkage body. The linkage gear and the linkage rack cooperate to make the output shaft rotate and drive the connecting shaft cylinder to move linearly.

4. The operating mechanism of the electrical switchgear according to claim 1 or 2, characterized in that, The linkage body includes a separate linkage plate and a tripping linkage component. Both the linkage plate and the tripping linkage component are guided and moved on the frame of the operating mechanism. The linkage plate is connected to the output shaft for transmission, and the tripping linkage component is connected to the connecting shaft cylinder. The linkage plate is provided with a top block for pushing the tripping linkage component to move.

5. The operating mechanism of the electrical switchgear according to claim 4, characterized in that, There are two top blocks, which are spaced apart along the axial direction of the connecting shaft. The tripping linkage has a push-supporting protrusion located between the two top blocks. One top block is used to push the push-supporting protrusion when the circuit is open, and the other top block is used to push the push-supporting protrusion when the circuit is closed. The distance between the two top blocks is greater than the width of the push-supporting protrusion along the moving direction of the connecting shaft.

6. The operating mechanism of the electrical switchgear according to claim 5, characterized in that, The top block is mounted on the linkage plate in an adjustable position.

7. The operating mechanism of the electrical switchgear according to claim 1 or 2, characterized in that, The frame of the operating mechanism is provided with a guide structure to guide the linear motion of the linkage. The guide structure includes a guide post set around the connecting shaft cylinder, and the linkage has a through hole for the guide post to pass through.

8. The operating mechanism of the electrical switchgear according to claim 7, characterized in that, A return spring is fitted on the guide post, with one end pressing against the frame and the other end pressing against the linkage.

9. The operating mechanism of the electrical switchgear according to claim 8, characterized in that, The linkage includes a limiting connecting plate that is sleeved on the connecting shaft cylinder. The connecting shaft cylinder is provided with a groove that cooperates with the limiting connecting plate to allow the connecting shaft cylinder to rotate relative to the linkage and maintain an axial relative position. The guide post passes through the limiting connecting plate, and the return spring is fitted on the portion of the guide post located on both sides of the limiting connecting plate.

10. An electrical switchgear, characterized in that, It includes the switch body and the operating mechanism of the electrical switchgear as described in any one of claims 1-9.

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