Locking mechanism for spring operating device of circuit breaker

Abstract

The utility model relates to a kind of locking mechanism of circuit breaker spring operating device, it is located front plate and include: the drive plate pivotally to front plate, wherein the drive plate includes with the fixed connection of body and the connecting end of the body protruding from the opening half shaft;And pivotally to front plate, with the closing release top plate adjacent arrangement of the locking plate, wherein the locking plate includes with the driven end of the connecting end operation connection and the locking end opposite thereto, wherein in response to the opening release end head extension actuates the opening half shaft to make the movable contact of circuit breaker release, the drive plate pivoting drives the locking plate pivoting to the locking position of the locking end abutting closing release top plate. Circuit breaker spring operating device's locking mechanism according to the utility model has the advantages such as simple structure, logic direct reliable, good universality.

Description

Technical Field

[0001] This utility model relates to the field of operating mechanisms for medium-voltage power distribution systems, and in particular to a locking mechanism for a spring operating device for a circuit breaker. Background Technology

[0002] It is known that circuit breaker cabinets are commonly used in medium-voltage power distribution systems to supply power to residential and industrial areas. These cabinets mostly employ vacuum circuit breakers and disconnecting switches. The opening and closing of circuit breaker and switch contacts achieves the purpose of breaking and closing circuits, thereby ensuring normal power supply. Therefore, the mechanical operating system must meet various requirements to ensure the safe operation of the switch. To ensure the working performance and reliability of the circuit breaker, high requirements must be placed on the working performance and quality of the operating mechanism. Firstly, the switch must operate reliably and stably, with rapid braking; it must have sufficient operating energy to overcome the electrodynamic force generated by the short-circuit fault current, satisfying the circuit breaker's breaking and closing functions; it must also have a closing holding function to ensure that the circuit breaker remains in the closed position after the closing command and operating force disappear; and it must possess buffering, free tripping, tripping, and reset functions.

[0003] According to relevant national mandatory regulations, it is desirable to interlock the current closed or open position of the circuit breaker cabinet with other mechanisms to achieve a free-trip function. That is, if a mechanical trip signal (e.g., via a manual trip button) is applied and maintained before the circuit breaker applies a closing signal (mechanical or electrical), then to ensure operator safety, the circuit breaker should prioritize the opening operation when simultaneously receiving both the opening and closing signals. At this time, the circuit breaker contacts are not allowed to close, even momentarily. As a result, the moving contact returns to the open position and remains in the open position, even with continuous closing commands. This free-trip function may require releasing spring energy during operation. However, the movement of the contacts should not reduce the contact gap by more than 10%, nor should it reduce the rated dielectric withstand capacity of the contact gap, and the contacts should be in the fully open position.

[0004] To achieve this free-jump functionality, the following approach has been proposed:

[0005] 1. If the trip / open button in the circuit breaker is pressed (electrically or mechanically), the closing button should be prevented from being mechanically pressed by adding relevant electrical functional structures. This can be achieved through an appropriate interlocking scheme, such as an electrical interlock using an electromagnet to prevent closing. If a mechanical trip signal is applied and held before the closing signal (mechanical or electrical), the microswitch will disconnect the power supply to the closing coil magnet, and the iron core of the closing coil magnet will extend to prevent the closing button from mechanically closing the circuit breaker. Simultaneously, the iron core will close the microswitch whose normally open contact is connected in series with the closing coil, which will prevent the circuit breaker from being electrically closed.

[0006] 2. Another feasible option is to propose the following mechanism design, in which the closing button can be pressed, but the energy storage spring is released into the air instead of releasing energy on the main shaft to close the vacuum interrupter.

[0007] Therefore, there is still a practical need in the art to provide a device with fewer components, a simpler structure, and minimal impact on the main functional modules of the spring operating device for circuit breakers. Utility Model Content

[0008] Therefore, the objective of this invention is to provide a locking mechanism for a spring-operated device for a circuit breaker, thereby at least partially overcoming the disadvantages of the prior art.

[0009] According to one aspect of the present invention, a locking mechanism for a circuit breaker spring operating device is provided, wherein the circuit breaker spring operating device includes a front plate, a middle plate, a rear plate, a tripping mechanism, and a closing mechanism arranged sequentially from the outside to the inside. The tripping mechanism includes a tripping half-shaft pivotally mounted to the front plate and a tripping device operatively connected to the tripping half-shaft. The closing mechanism includes a closing half-shaft pivotally mounted to the front plate, a closing device located on the front plate, and a closing tripping top plate operatively connected to the closing device and sleeved on the closing half-shaft. The locking mechanism includes: a drive plate pivotally mounted to the front plate, wherein the drive plate includes a body fixedly connected to the tripping half shaft and a connecting end protruding from the body; and a locking plate pivotally mounted to the front plate and arranged adjacent to the closing tripping top plate, wherein the locking plate includes a driven end operatively connected to the connecting end and a locking end opposite thereto, wherein in response to the extension of the tripping tripping end to actuate the tripping half shaft to cause the moving contact of the circuit breaker to trip, the drive plate pivots to drive the locking plate to pivot to the locking position where the locking end abuts against the closing tripping top plate.

[0010] Compared with existing technologies, the locking mechanism of the circuit breaker spring operating device according to this utility model has advantages such as simple structure and straightforward logic. That is, by simply adding this newly designed locking mechanism to the front plate of the circuit breaker, the circuit breaker can be given a free trip function without any modification to the internal structure of the existing circuit breaker spring operating device. Because the internal structure of the circuit breaker spring operating device involves complex transmission chain design and control logic connections, modifying the internal structure will have a series of potential impacts on the main function of the circuit breaker spring operating device: for example, the machining accuracy and fit of the newly added internal components will lead to changes in the existing transmission chain design and control logic connections, which will adversely affect the reliability and functionality of the spring operating device. Therefore, the locking mechanism according to this utility model is suitable for adding a free trip function to new models of circuit breaker spring operating devices, as well as for upgrading the free trip function of existing circuit breaker spring operating devices, and has the characteristics of high versatility.

[0011] As a preferred aspect of this utility model, it further includes a mounting plate arranged adjacent to the closing trip top plate, wherein the mounting plate is provided with a pivot extending from it, which allows the locking plate to pivot about it.

[0012] As a preferred aspect of this utility model, the locking plate is designed as a generally L-shaped plate.

[0013] As a preferred aspect of the present invention, the connecting end of the drive plate is designed to have a slot with a predetermined length and the driven end of the locking plate has a protrusion accommodated in the slot.

[0014] As a preferred aspect of the present invention, the body of the drive plate has a keyway through which the opening half shaft passes, so that a non-rotational key connection is formed between the drive plate and the opening half shaft.

[0015] As a preferred aspect of this utility model, it further includes a protruding post extending from the locking end of the locking plate, wherein the protruding post abuts against the tripping top plate when the locking plate is pivoted to the locking position.

[0016] As a preferred aspect of this utility model, it further includes a reset spring sleeved on the tripping half shaft, wherein the reset spring is designed to reset the tripping half shaft when the tripping tripping end retracts, thereby causing the drive plate to pivot and drive the locking plate to pivot to the unlocking position where the locking end disengages from the closing tripping top plate.

[0017] As a preferred aspect of the present invention, at least one of the drive plate and the locking plate is designed as a sheet metal part.

[0018] As a preferred aspect of this utility model, the rotation angle of either the drive plate or the locking plate is no greater than 60 degrees.

[0019] Other features and advantages of this invention will partly be apparent to those skilled in the art upon reading this application, and partly will be described below in conjunction with the accompanying drawings in the detailed description. Attached Figure Description

[0020] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a perspective view of a spring-operated device for a circuit breaker according to an embodiment of the present invention, wherein some components have been removed to better show the internal structure;

[0022] Figure 2 yes Figure 1 A perspective view of the spring-operated mechanism of a circuit breaker, with some components removed to better show the internal structure;

[0023] Figure 3 yes Figure 1 Side view of the circuit breaker with spring operating device;

[0024] Figure 4 yes Figure 3 A top view of the spring-operated device for a circuit breaker;

[0025] Figure 5 yes Figure 1 A perspective view of a circuit breaker spring-operated device, in which some components have been removed to better show the internal structure;

[0026] Figure 6 yes Figure 1 A perspective view of a circuit breaker with a spring-operated mechanism, in which more components have been removed to better show the internal structure;

[0027] Figure 7 yes Figure 1 A perspective view of the energy storage clutch mechanism of the spring-operated device for the circuit breaker, which also shows the closing operation mechanism that works in conjunction with it;

[0028] Figure 8 yes Figure 7 A component in the energy storage clutch mechanism;

[0029] Figure 9 yes Figure 7 Another component in the energy storage clutch mechanism;

[0030] Figure 10 It is based on Figure 1The circuit breaker uses a spring-operated device, in particular showing the locking structure therein, which is in a locked state that disables the closing tripping function.

[0031] Figure 11 It is based on Figure 1 The circuit breaker uses a spring-operated device, in particular showing the locking structure, which is in an unlocked state that allows the closing tripping function to operate freely.

[0032] Explanation of reference numerals in the attached figures:

[0033] 10. Spring-operated device for circuit breakers; 10A. Front panel; 10B. Middle panel;

[0034] 10C. Rear plate; 11. Drive board; 11A. Connecting end; 11B. Body; 11C. Return spring;

[0035] 12. Locking plate; 12A. Driven end; 12B. Locking end; 13. Mounting plate;

[0036] 100. Electric-manual energy storage mechanism; 101. Energy storage motor;

[0037] 102. Adapter; 103. Pinion; 104. One-way bearing;

[0038] 105. Mounting plate; 200. Energy storage shaft; 201. Spring-loaded crank arm; 202. Energy storage spring;

[0039] 203. Indicator; 300. Energy storage clutch mechanism; 301. Large gear; 301A. Screw;

[0040] 301B. Torsion spring; 301C. Pawl; 301D. Pawl pin; 301E. Washer;

[0041] 302. Clutch wheel; 302A. Engagement groove; 303. Cam; 304. Overlapping roller;

[0042] 305. Rivet pin; 400. Output shaft; 401. Cam roller; 402. Closing holding roller;

[0043] 403. Oil buffer plate; 403A. Oil buffer cylinder; 404. Brake spring crank arm;

[0044] 404A. Opening spring guide rod; 405. Mechanism output shaft crank arm; 405A. Mechanism output connecting rod;

[0045] 500. Closing operating mechanism; 501. Closing half shaft; 502. Closing stop shaft;

[0046] 503. Clutch torsion spring; 504. Closing brake; 505. Clutch shift wheel; 506. Bearing;

[0047] 600. Tripping operating mechanism; 601. Tripping half shaft; 602. Tripping stop; 603. Tripping latch;

[0048] 700. Opening / closing indicator mechanism; 701. Output shaft cam; 702. Opening / closing status indicator;

[0049] 703. Auxiliary switch; 704. Counter spring; 705. Counter; 706. Transmission rod;

[0050] 800. Closing trip mechanism; 801. Closing trip unit; 802. Closing trip top plate;

[0051] 802A. Lower end of roof plate; 802B. Upper end of roof plate; 803. Anti-overlapping crank arm;

[0052] 900. Tripping mechanism; 901. Tripping device; 901A. Tripping terminal;

[0053] 901B. Tripping rod; X. Length direction; Y. Thickness direction; Z. Height direction; Detailed Implementation

[0054] Referring now to the accompanying drawings, a schematic scheme of the locking mechanism of the spring-operated device for circuit breakers disclosed in this utility model is described in detail. Although the drawings are provided to illustrate some embodiments of this utility model, the drawings are not necessarily drawn to the dimensions of the specific embodiments, and certain features may be enlarged, removed, or partially cut to better illustrate and explain the disclosure of this utility model. Some components in the drawings may be repositioned according to actual needs without affecting the technical effect. The phrase "in the drawings" or similar terms appearing in the specification do not necessarily refer to all drawings or examples.

[0055] Certain directional terms used in the description of the accompanying drawings below, such as “inner,” “outer,” “above,” “below,” and other directional terms, will be understood to have their normal meaning and refer to those directions as normally viewed in the accompanying drawings. Unless otherwise specified, the directional terms used in this specification are generally in accordance with the conventional directions understood by those skilled in the art.

[0056] The terms “first,” “first,” “second,” “second,” and similar terms used in this utility model do not indicate any order, quantity, or importance, but are used to distinguish one component from other components.

[0057] Spring operating mechanism for circuit breakers

[0058] exist Figures 1 to 6 The diagram exemplarily illustrates a spring-operated device 10 for a circuit breaker according to the present invention, which can be used to close the circuit breaker switch, carry and interrupt current under normal circuit conditions, and close, carry and interrupt current under abnormal circuit conditions for a specified time. This spring-operated device 10 is preferably suitable for switchgear or ring main units with disconnecting switches such as vacuum circuit breakers or solid-sealed poles. The spring-operated device 10 for a circuit breaker according to the present invention features a novel functional design of free tripping capability.

[0059] To better characterize the spatial positions and relative interactions of the various functional components in the circuit breaker spring operating device 10, the longitudinal direction of the circuit breaker spring operating device 10 is defined as the length direction or X direction, the depth direction is defined as the thickness direction or Y direction, and the vertical direction is defined as the height direction or Z direction. Reference systems composed of these three or two directions are indicated in various views. It should be noted that the above reference systems are merely for the purpose of enabling those skilled in the art to understand the present invention more clearly and intuitively, and are not intended to limit the scope of protection of the present invention, nor should they be construed as limiting the scope of protection of the present invention.

[0060] like Figure 1-4 As shown, the circuit breaker spring operating device 10 includes a front plate 10A, a middle plate 10B, and a rear plate 10C arranged in parallel along its longitudinal direction or Y direction (corresponding to from the outside to the inside in the drawing). These front plates 10A, middle plates 10B, and rear plates 10C are preferably stamped from, for example, aluminum alloy or sheet metal and are reliably connected to each other by means of multiple fasteners or riveting elements. Furthermore, punching operations are performed on these front plates 10A, middle plates 10B, and rear plates 10C to form mounting holes for pivotally mounting the various functional components of the circuit breaker spring operating device 100. Preferably... Figure 3-4 As shown, a first chamber for housing multiple functional components of the circuit breaker spring operating device 100 is formed between the front plate 10A and the middle plate 10B, and a second chamber for housing multiple functional components of the circuit breaker spring operating device 100 is formed between the middle plate 10B and the rear plate 10C.

[0061] Furthermore, an electric-manual energy storage mechanism 100 (see Appendix) can also be installed on the front panel 10A. Figures 7 to 9The secondary electrical components include the adapter 102, the closing trip unit 801 in the closing trip mechanism 800, the closing trip top plate 802, and the opening trip unit in the opening trip mechanism 900, the output shaft cam 701 of the opening / closing indicator mechanism 700, and the opening / closing status indicator 702, etc. Meanwhile, the transmission components of the closing operating mechanism 500 and the opening operating mechanism 600, which are operatively connected to the closing trip mechanism 800 and the opening trip mechanism 900, are built into the first chamber sandwiched between the front plate 10A and the middle plate 10B. The actuating components such as the mechanism output link 405A, the opening spring guide rod 404A, and the energy storage spring 202, which are operatively connected to disconnecting switches (downstream components driven by the spring operating device 10) such as vacuum interrupter VI or solid-sealed poles in the switchgear, are built into the second chamber sandwiched between the middle plate 10B and the rear plate 10C (see Appendix). Figures 5 to 6 ).

[0062] With the help of this three-ply structure design, most or even all of the secondary electrical components in the circuit breaker spring operating device 10 according to this utility model can be arranged on the front plate 10A. On the one hand, this allows for modular assembly of the operating device 10, making the user's operation more intuitive and facilitating the replacement and maintenance of secondary electrical components, thus providing good overall integrity. On the other hand, the overall force distribution of the entire operating device 10 is more reasonable, and components can be placed in both the internal and external directions as well as the length direction, making the operating device 10 more reliable and having a longer service life compared to the prior art.

[0063] exist Figure 2-3 As shown, an electric-manual energy storage mechanism 100 for storing energy in the circuit breaker spring operating device 10 is provided on the lower left side of the front plate 10A. The electric-manual energy storage mechanism 100 includes an adapter 102 extending from the front plate 10A, which allows the user to connect and rotate it with a tool to store energy, and an input shaft operatively connected thereto. At the end of the input shaft located in the first chamber, there is a pinion 103 for operatively connecting with the energy storage shaft 200 described in detail below, and a one-way bearing 104 for allowing the input shaft 101A to rotate unidirectionally relative to the front plate 10A.

[0064] Furthermore, the circuit breaker spring operating device 10 also includes an energy storage shaft 200, which is built into the first chamber and arranged parallel to and spaced apart from the input shaft 101A, wherein... Figures 3 to 5As best shown, the inner end of the energy storage shaft 200 extends through the middle plate 10B to a second chamber sandwiched between the middle plate 10B and the inner plate 10C, and a spring crank arm 201 that can rotate with it is fixedly provided at its inner end. One end of the spring crank arm 201 is fixedly connected to the energy storage spring 200 located in the second chamber, and the other end of the energy storage spring 200 is fixedly connected to a fastener for connecting the middle plate 10B and the rear plate 10C.

[0065] Here, for example, when the energy storage shaft 200 is driven to rotate counterclockwise, the energy storage spring 200 is stretched and stores elastic potential energy by means of the spring-loaded crank arm 201. Simultaneously, as... Figure 2 The energy storage shaft 200 shown has an indicator 203 located on the outer side of the front plate 10A at its outer end. This indicator 203 also rotates with the energy storage shaft 200, thereby indicating to the user whether the energy storage shaft 200 in the circuit breaker spring operating device 10 is in an energy-stored or non-energy-stored state. Preferably, the outer periphery of the indicator 203 at the outer end of the energy storage shaft 200 is also designed with a cam-shaped line 203A. Below the indicator 203 is a switch 204 (e.g., for obtaining the position signal of the energy storage shaft 200). Figure 1 (As shown). Thus, with the help of this design, users can intuitively obtain the current state of the energy storage shaft 200 to avoid misoperation. Furthermore, the switch 204 can also be used to achieve interlocking or mutual locking between the energy storage shaft 200 and other components.

[0066] Next Figures 7 to 9 The diagram shows the energy storage clutch mechanism 300 of the spring-operated device 10 for a circuit breaker according to this utility model. The energy storage clutch mechanism 300 includes a large gear 301 sleeved on an energy storage shaft 200, wherein the large gear 301 is always engaged with a small gear 103 in the electric-manual energy storage mechanism 100. It should be noted that the large gear 301 sleeved on the energy storage shaft 200 is not actually meshed with the energy storage shaft 200; the two are connected by means of... Figure 9 The pawl 301C shown in the image is... Figure 8 The engagement between the clutch wheel 302 shown is achieved. Both the clutch wheel 302 and the parallel-spaced cam 303 have internal splines that mesh with the splines on the energy storage shaft 200 to rotate together with it. The clutch wheel 302 and cam 303 are linked by a rivet pin 305. Thus, the drive connection to the energy storage shaft 200 is achieved with a simple structure and assembly design, significantly increasing the functional integration.

[0067] On the side of the large gear 301 facing the clutch wheel 302, there is a pawl 301C that can pivot about a pawl pin 301D. The pawl 301C is pivotally positioned between the large gear 301 and the clutch wheel 302 at a suitable distance by means of a washer 301E, such as a copper washer. A screw 301A is provided circumferentially spaced from the pawl 301C. One leg of a torsion spring 301B pivotally mounted to the large gear 301 abuts against the screw 301A, and the other leg abuts against the end of the pawl 301C to hold it in place. Corresponding to the pawl 301C (e.g., ... Figures 7 to 8 As shown, a mating groove 302A is provided on the outer periphery of the clutch wheel 302 to engage with it. Thus, when the pawl 301C is under the force of the torsion spring 301B, it can engage with it and transmit the rotational motion from the large gear 301 unidirectionally to the energy storage shaft 200 via the clutch wheel 302 and the cam 303, without transmitting the rotational motion of the energy storage shaft 200 back to the large gear 301. This realizes the unidirectional clutch transmission relationship between the large gear 301 and the energy storage shaft 200.

[0068] Furthermore, such as Figure 7 As shown, the circuit breaker spring operating device 10 also has an energy storage holding mechanism, as part of the closing operation mechanism 500 described below, for holding the energy storage shaft 200 in its current position. This energy storage holding mechanism includes a closing stop shaft 502 disposed between the closing half-shaft 501 and the energy storage shaft 200, a closing stop 504 sleeved on the closing stop shaft 502 via a torsion spring 503, and a clutch / disengagement wheel 505 located on the closing stop shaft 2 and arranged adjacent to the closing stop 504. Here, the closing stop shaft 502 is pivotally supported to the front plate 10A by means of a bearing 506 arranged adjacent to the front plate 10A. Figure 7 As shown, the energy storage and holding mechanism also includes an overlapping roller 304 that is fixedly disposed between the clutch wheel 302 and the cam 303 and can abut against the closing lever 504.

[0069] When assembling the energy storage and holding mechanism of the spring operating device 10 for the circuit breaker, the closing stop 504 and the torsion spring 503 can be first assembled onto the closing stop shaft 502, which integrates the clutch switching wheel 505 arranged adjacent to the closing stop 504. The closing stop shaft 502 thus has a stepped design, allowing the integrated clutch switching wheel 505 to be used as a positioning reference or limiting element for the closing stop 504 during assembly, simplifying the assembly process. Next, the overlapping roller 304 is assembled between the clutch wheel 302 and the cam 303, and then the two are fixedly connected with a rivet pin 305. Then, the pawl 301C and the washer 301E are riveted to the large gear 301 by means of the pawl pin 301D, and then the torsion spring 301B is arranged between the screw 301A and the pawl 301C with a certain preload.

[0070] When it is necessary to rotate the energy storage shaft 200 to stretch the energy storage spring 202 for energy storage, the small gear 103, which meshes with the large gear 301, is rotated by means of the electric-manual energy storage mechanism 100. For example... Figure 7 The large gear 301 rotates counterclockwise, causing the pawl 301C, which is fixedly connected to it, to rotate. Under the action of the torsion spring 301B, the front end of the pawl 301C can engage with the engagement groove 302A of the clutch wheel 302, thereby driving the clutch wheel 302 and the cam 303 to rotate. Since the clutch wheel 302 and the cam 303 are connected to the energy storage shaft 200 via a spline, the energy storage shaft 200 also rotates counterclockwise. This will drive the spring crank arm 201 and the energy storage spring 202 to move, thereby stretching the energy storage spring 202 to store energy. When the large gear 301 is continuously rotated externally, when the tail end of the pawl 301C on the large gear 301 touches the clutch switching wheel 505 located on the closing brake shaft 502, the front end of the pawl 301C will lift up and disengage from the engagement groove 302A of the clutch wheel 302, thereby decoupling or disengaging the transmission relationship between the large gear 301 and the energy storage shaft 200 to realize energy storage clutch.

[0071] After the energy storage shaft 200 has completed the extension and energy storage of the energy storage spring 200, the assembly of the cam 303 and the clutch wheel 303, under the action of the torsion spring, reliably abuts the overlapping roller 304 located between them against the tail of the closing stop 504 located on the closing stop shaft 502, and at the same time pushes the other end of the closing stop 504 to overlap with the closing half shaft 501 (e.g., Figure 7 As shown in the diagram, this design enables the energy storage shaft 200 and its associated mechanisms to be held in their energy-storing positions.

[0072] Those skilled in the art will understand that, in addition to the advantages of simplified assembly and high functional integration mentioned above, this invention utilizes overlapping rollers 304 to bear the holding force during energy storage or closing. Therefore, this holding method can withstand considerable forces, thereby extending the lifespan of the mechanism. Simultaneously, because the cam 303 and clutch wheel 302 are riveted together, and the overlapping rollers 304 for energy storage are integrated between them, this design results in balanced force distribution, high structural strength, and reduced material usage for the cam and clutch wheel, saving materials and improving reliability. Furthermore, the clutch switching wheel 505 is integrated into the closing brake shaft 502, resulting in a more rational force distribution, reduced material usage, and a smaller number of parts.

[0073] like Figures 3 to 6As shown, the circuit breaker spring operating device 10 also includes an output shaft 400, which is built into a first chamber and arranged parallel to and spaced apart from the energy storage shaft 200, wherein... Figure 4 As best shown, the inner end of the output shaft 400 extends through the middle plate 10B to the second chamber formed by the middle plate 10B and the inner plate 10C, and a shunt spring crank arm 404 and a mechanism output shaft crank arm 405 that can rotate together are fixedly provided at its inner end. Preferably, the shunt spring crank arm 404 and the mechanism output shaft crank arm 405 at the end of the output shaft 400 adjacent to the rear plate 10C are arranged close to each other in the same posture on the output shaft 400. The innermost mechanism output shaft crank arm 405 is linked to a mechanism output link 405A for operation connection with a disconnecting switch (a downstream component driven by the spring operating device 10) in the switch cabinet, such as a vacuum interrupter VI or a solid-sealed pole. The shunt spring crank arm 404 is linked to a shunt spring guide rod 404A fixedly connected at one end, wherein a shunt spring that can be stretched to store energy is sleeved on the shunt spring guide rod 404A. Here, the brake spring crank arm 404 and the mechanism output shaft crank arm 405 are fixedly connected to each other by rivets, which simplifies the manufacturing process of these components. That is, there is no need to use cast steel structures that are difficult to process and costly; functional integration can be achieved simply by riveting.

[0074] Furthermore, the output shaft 400 has a cam roller 401 located adjacent to the cam 303 in the energy storage clutch mechanism 300. This cam roller 401 is operatively connected to the cam 303 to receive rotational energy from the energy storage shaft 200, and is fixedly connected to the output shaft 400 to rotate together with it. The cam roller 401 also has a similarly extending brake holding roller 402 in the opposite direction (approximately 180 degrees apart), so that when the cam roller 401 is driven to rotate by the cam 303, it also drives the brake holding roller 402 to rotate accordingly. Preferably, to prevent the output shaft 400 from rotating excessively, an oil buffer plate 403 is provided near the cam roller 401, and an oil buffer cylinder 403A is provided between the front plate 10A and the middle plate 10B to abut against the oil buffer plate 403. The distance between the two is designed to dampen the excessive rotational energy transmitted from the energy storage shaft 200 to the output shaft 400 by means of the abutment between the oil buffer cylinder 403A and the oil buffer plate 403.

[0075] As described above, after the energy storage shaft 200 is stretched by the energy storage spring 202 using the electric-manual energy storage mechanism 100 to complete energy storage, the energy storage shaft 200 is held in the stored energy position by the closing stop 504, which is connected between the closing half-shaft 501 and the connecting roller 304. At this time, the closing operation can be performed according to the user's operation or remote control signal, as follows:

[0076] When the closing tripping mechanism 800 located on the front panel 10A receives a closing signal or when the user manually performs a closing operation, the closing half-shaft 501, which abuts against the closing stop 504, rotates, thereby releasing the abutment and constraint relationship between the two. At this time, the closing stop 504 can no longer abut or constrain the overlapping roller 304 and the cam 303 fixedly connected to it. As a result, the energy storage shaft 200 rotates clockwise, for example, under the action of the energy storage spring 202. During this process, the cam 303 mounted on the energy storage shaft 200 will strike the cam roller 401 on the output shaft 400, causing the output shaft 400 to rotate counterclockwise accordingly. Thus, the output shaft 400 drives the mechanism output shaft crank arm 405 and the mechanism output connecting rod 405A located at the inner end to move, thereby driving the disconnecting switch (such as the vacuum interrupter VI or the solid-sealed pole) in the switch cabinet (the downstream component driven by the spring operating device 10) to complete the closing operation. At the same time, as the output shaft 400 rotates counterclockwise, it drives the opening spring crank arm 404 and the opening spring guide rod 404A, which is linked to it and has the opening spring sleeved on it, to move, thereby stretching the opening spring to store energy.

[0077] Furthermore, for example, it can be done Figures 5 to 6 As clearly shown, during the rotation of the output shaft 400, the closing holding roller 402, mounted on the output shaft 400 and located on the opposite side of the cam roller 401, presses against the opening stop 602, which will be described in detail below, causing the opening stop 602 to rotate and avoid the output shaft 400. When the closing holding roller 402 passes the highest point of the opening stop 602, the opening stop 602 automatically resets under the action of the torsion spring force. At the same time, the cam 303 has also rotated past the cam roller 401, releasing the interaction force between the output shaft 400 and the energy storage shaft 200. At this time, the output shaft 400 rotates back under the action of the opening spring sleeved on the opening spring guide rod 404A until the closing holding roller 402 contacts the opening stop 602. The opening stop plate 603, which is mounted together with the opening stop 602, rotates under the action of the closing holding roller 402 until the opening stop plate 603 abuts against the opening half shaft 601. As a result, the tripping plate 603, the tripping lever 602, and the output shaft 400 stop moving. At this time, the circuit breaker spring operating device 10 is in the closed state and is ready for the tripping operation.

[0078] The following is a detailed description of the tripping operation mechanism 600 of the spring-operated device 10 for the circuit breaker, with reference to the accompanying drawings. The clearest part is... Figures 5 to 6As shown, the tripping operation mechanism 600 includes a tripping half-shaft, a tripping latch plate pivotally connected to the front plate, the end of the tripping latch plate being connected to a tripping half-shaft 601 pivotally mounted between the front plate 10A and the middle plate 10B, a tripping latch plate 603 that can abut against the tripping half-shaft 601 by means of a torsion spring, and a tripping stop 602 located between the closing holding roller 402 and the tripping latch plate 603 and actuated by the closing holding roller 402.

[0079] As described above, after the output shaft 400 completes the closing operation and the opening spring is fully charged by the closing tripping mechanism 800, the circuit breaker spring operating device 10 is in the closed state and ready for the opening operation. At this time, the opening operation can be performed according to user operation or remote control signals, as follows:

[0080] When the tripping mechanism 900 located on the front panel 10A receives a tripping signal or when the user manually performs a tripping operation, the tripping half-shaft 601, which abuts against the tripping latch plate 603, can rotate, thereby releasing the abutment and constraint relationship between the two. See details. Figure 1 The tripping mechanism 900 includes a tripping device operatively connected to the tripping half-shaft 601 in the front panel. The tripping device includes a coil core capable of driving the tripping half-shaft to rotate, wherein in response to the rotation of the tripping half-shaft 601, the tripping stop 602 is switched from a first position to a second position.

[0081] Since the tripping plate 603 can rotate freely, the tripping stop 602 cannot provide sufficient holding force to maintain the output shaft 400 in the closed holding state by means of the closing holding roller 402. At this time, under the action of the energized tripping spring, the output shaft 400 will rotate clockwise, thereby driving the mechanism output shaft crank arm 405 and mechanism output link 405A located at the inner end to move, thereby driving the disconnecting switch (the downstream component driven by the spring operating device 10) in the switch cabinet, such as the vacuum interrupter VI or the solid-sealed pole, to complete the tripping operation. Subsequently, the circuit breaker spring operating device 10 can again perform energy storage, closing and tripping operations by means of the electric-manual energy storage mechanism 100.

[0082] As a preferred aspect, for example in Figure 1-4 As shown, the circuit breaker spring operating device 10 also includes an opening / closing indicator mechanism 700 located on the front plate 10A, wherein the opening / closing indicator mechanism 700 includes an output shaft cam 701 sleeved on the end of the output shaft 400 protruding from the front plate 10A, an opening / closing status indicator 702 operatively connected to the cam 701, a counter spring 704, and a counter 705 operatively connected to the counter spring 704.

[0083] Best in Figure 4 As shown, the output shaft cam 701 may be made of sheet metal, for example, and is fixedly connected to the end of the output shaft 400 by means of fasteners and rotates therewith. Here, the output shaft cam 701 has a splined hole positioned generally in the center, wherein the splined hole and the external spline of the output shaft 400 are form-fitted to enable a drive connection between the two by means of fasteners such as snap rings.

[0084] The circuit breaker spring operating device 10 in this utility model may also include a closing trip unit 801, preferably an electromagnetic coil type, located on the front plate 10A, a closing trip top plate 802 operatively connected to the closing trip unit 801 and sleeved on the closing half shaft 501, and an anti-reclosing crank arm 803 operatively connected to the other end of the closing trip top plate 802.

[0085] Preferably, a through hole is provided below the spline hole of the output shaft cam 701. This through hole is designed to accommodate the support leg of the spring sleeved on the outer periphery of the anti-reclosing crank arm 803. Thus, as the output shaft cam 701 rotates, it drives the spring to rotate as well, thereby placing the anti-reclosing crank arm 803 in a first position where it abuts against the top plate 802 of the closing trip unit. Subsequently, as the output shaft cam 701 rotates back, it drives the spring to rotate as well, thereby placing the anti-reclosing crank arm 803 in a second position where it disengages from the top plate 802 of the closing trip unit.

[0086] Specifically, the closing trip top plate 802 is a slender rod with a sleeve hole in the middle for fixed connection with the closing half shaft 501. The lower end 802A of the slender rod is operatively connected to the top end of the closing trip device 801, and its upper end 802B is operatively connected to the anti-reclosing crank arm 803. Here, the anti-reclosing crank arm 803 is pivotally mounted on the front plate 10A and can be operatively connected to the output shaft cam 701 by means of riveting so as to be driven by the output shaft cam 701. This allows the anti-reclosing crank arm 803 to rotate to a horizontal position when the output shaft 400 is in its closed holding state, that is, to abut against the upper end 805B of the slender closing trip top plate 802. At this time, even if the closing trip device 801 is activated to actuate the lower end 802A of the closing trip top plate 802, the closing trip top plate 802 cannot drive the closing half shaft 501 to rotate, thereby preventing a reclosing operation from occurring when the circuit breaker spring operating device 10 is already in the closed state.

[0087] Locking mechanism

[0088] In order to Figures 1 to 6 The circuit breaker shown has a free trip function to meet the relevant mandatory regulations of the country. Figures 1 to 6 The circuit breaker spring operating device shown in the figure also includes an additional feature... Figure 10 and 11 The locking mechanism is shown in detail in the diagram.

[0089] Among them, Figure 10 The interlocking structure is in a locked state that disables the closing tripping function. In this state, the circuit breaker is not allowed to be closed using the spring-operated device, even for momentary closing. As a result, when the circuit breaker is opened using the spring-operated device to return the moving contact to the open position and maintain it there, even if a closing command is continuously issued (e.g., the closing tripping device 801 is actuated), the moving contact remains in the open position. Meanwhile, in... Figure 11 The interlocking structure is in the unlocked state, which allows the closing tripping function to operate freely. At this time, the circuit breaker can freely perform closing operation or closing tripping using the spring operating device. That is, as long as a closing command is received (for example, the closing tripping device 801 is actuated), the moving contact will normally move from the open position to the closed position.

[0090] like Figure 10 and 11 As shown, the locking mechanism includes a drive plate 11 located on the front plate 10A and fixedly connected to the tripping half-shaft 601. The drive plate 11 is designed as a generally elongated solid plate, and its body 11 is fixedly connected to and rotates with the end of the tripping half-shaft 601 protruding from the front plate 10A. More specifically, the drive plate 11 has the following characteristics: Figure 10 The Z-direction protruding connecting end 11A and the body 11B that is anti-rotationally connected to the tripping half shaft 601 are shown in the figure. Here, the connecting end 11A is used as an operative connection with the locking plate 12 described below, and the body 11B is designed with a keyway for the tripping half shaft 601 to pass through, thereby forming an anti-rotation key connection between the body 11B of the drive plate 11 and the tripping half shaft 601 (see [reference]). Figure 10 Those skilled in the art will understand that the anti-rotation connection between the drive board 11 and the trip half-shaft 601 does not necessarily have to be a keyed connection; other fastening methods are also feasible.

[0091] Furthermore, the locking mechanism also includes a return spring 11C connected to the tripping half-shaft 601. The return spring 11C is configured to always bias the tripping release top plate 901B, which is fixedly connected to the tripping half-shaft 601, toward the tripping release end 901A of the tripping release device 901 to ensure reliable contact between the two. This ensures that the tripping half-shaft 601 can reliably pivot between the tripping release position and the reset position after tripping release, in constant response to the extension and retraction of the tripping release end 901A of the tripping release device 901.

[0092] Furthermore, below the drive plate 11, there is a locking plate 12 located on the front plate 10A, adjacent to the closing trip top plate 802 and pivotally mounted to the front plate 10A. The locking plate 12 can also be designed as a generally L-shaped solid plate, having a driven end 12A operatively connected to the connection end 11A of the drive plate 11 and a locking end 12B opposite thereto. Preferably, the connection end 11A can be designed with a slot of a certain length, and the driven end 12A of the locking plate 12 is designed as a protrusion accommodated in the slot, and the locking end 12B has a protrusion extending from it, wherein the protrusion abuts against the opening trip top plate 802 when the locking plate 12 is pivoted to the locking position as described in detail below.

[0093] This design enables a simple and reliable pivoting and transmission between the drive plate 11 and the locking plate 12. The transmission is designed such that when the locking plate 12 responds to the maximum pivoting of the connecting end 11A of the drive plate 11, its locking end 12B (especially the protrusion thereon) is at least in contact with the lower end 802A of the adjacent closing trip top plate 80. Preferably, to ensure reliable pivoting of the drive plate 11 on the front plate 10A, a mounting plate 13 is provided adjacent to the closing trip top plate 80, with a pivot protruding from the mounting plate 13 at a suitable position, allowing the locking plate 12 to pivot about it, thereby reliably placing the drive plate 12 in a suitable position on the front plate 10A.

[0094] like Figure 11 As shown, under normal circumstances, after the output shaft 400 completes the closing operation and the opening spring is fully charged by the closing trip mechanism 800, the circuit breaker spring operating device 10 is in the closed state and ready for the opening operation. At this time, if the opening trip unit 901 of the opening trip mechanism 900 is actuated according to user operation (e.g., manually pressing the opening button) or a remote control signal to perform the opening trip operation, the locking mechanism of the circuit breaker spring operating device performs the free trip function as follows:

[0095] See details Figure 11 The tripping mechanism 900 includes a tripping device 901 operatively connected to the tripping half-shaft 601 in the front panel. The tripping device 901 includes a tripping end 901A that actuates against a tripping top plate 901B fixedly connected to the tripping half-shaft 601. The tripping top plate 901B is biased by a return spring 11C to maintain contact with the tripping end 901A. When no electric or manual signal is received, the tripping end 901A of the tripping device 901 remains in contact with the tripping end 901A. Figure 11The diagram shows the unextended position, at which point both the drive plate 11 and the locking plate 12 in the locking mechanism are in the unlocked state. As a result, the tripping operation at this time is independent of or unrelated to the closing tripping mechanism 800 or the tripping tripping top plate 802.

[0096] When the tripping mechanism 900 located on the front panel 10A receives a tripping signal or the user manually performs a tripping operation, the tripping terminal 901A of the tripping device 901 moves along... Figure 10 The Z-direction pushes upwards, thereby driving the tripping plate 901B, which is against it, to move along... Figure 10 The counterclockwise rotation of the tripping spring causes the tripping half-shaft 601, which abuts against the tripping plate 603, to rotate, thereby releasing the contact and constraint between them and switching the tripping stop 602 from the first position to the second position. At this time, since the tripping plate 603 can rotate freely, it can no longer provide sufficient holding force to the tripping stop 602 to maintain the output shaft 400 in the closed holding state by means of the closing holding roller 402. At this time, under the force of the energized tripping spring, the output shaft 400 will rotate clockwise and drive the mechanism output shaft crank arm 405 and the mechanism output link 405A located at the inner end to move, thereby driving the disconnecting switch (such as the vacuum interrupter VI or the solid-sealed pole, the downstream component driven by the spring operating device 10) in the switch cabinet to complete the tripping operation and causing the moving contact of the circuit breaker to be in the tripped position.

[0097] Synchronously, as the drive plate 11 rotates counterclockwise together with the tripping half-shaft 601, its connecting end 11A also rotates counterclockwise by a certain angle, thereby driving the driven end 12A, which is operably connected to it, to rotate. Here, the rotation angle of either the drive plate 11 or the locking plate 12 is no greater than 60 degrees, and especially no greater than 45 degrees. As a result, at this time, the locking plate 12 relative to the mounting plate 13 rotates... Figure 11 Rotate clockwise to Figure 10 The position shown in the figure. As a result, the protrusion of the locking end 12B of the locking plate 12 is actuated to a position that reliably abuts against the adjacent closing trip top plate 802 and thereby prevents any undesired rotation of the closing trip top plate 802 (such as...). Figure 10 (As shown). Therefore, at this time, the closing operation cannot be performed by actuating the closing trip top plate 802 via the closing trip unit 801. That is, as long as the opening trip terminal 901A of the opening trip unit 901 is in the extended state because the operator has not interrupted the opening signal or the manual opening operation has not ended, the interlocking plate 12 will always be in the extended state. Figure 10The circuit breaker is in the locked state as shown in the figure. During this period, even if there is a signal from an external closing operation to actuate the closing trip unit 801 to perform a closing trip operation, the moving contact of the circuit breaker is always kept in the open position because the closing trip top plate 802 is always stopped by the locking plate 12.

[0098] Subsequently, when the operator interrupts the trip signal or the manual tripping operation has ended, the tripping release terminal 901A of the tripping release device 901 retracts to... Figure 11 The initial position shown in the figure allows the drive plate 11 to retract under the action of the reset spring 11C as the tripping terminal 901A retracts. Figure 10 The position shown is actuated clockwise, thereby driving the locking plate 12 from its position. Figure 10 The locked position shown in the image is rotated counterclockwise to... Figure 11 The diagram shows the unlocked position, disengaged from the closing trip top plate 802. As a result, the circuit breaker can now perform a closing operation via the closing trip unit 801 actuating the closing trip top plate 802, and the locking mechanism is ready for free tripping during the next opening operation.

[0099] As can be seen from the above, the locking mechanism of the circuit breaker spring operating device according to this utility model has advantages such as simple structure and straightforward logic. That is, by directly adding this newly designed locking mechanism to the front plate 10A of the circuit breaker, the circuit breaker can be given a free trip function without any modification to the internal structure of the existing circuit breaker spring operating device. Because the internal structure of the circuit breaker spring operating device involves complex transmission chain design and control logic connections, modifying its internal structure will have a series of potential impacts on the main function of the circuit breaker spring operating device: for example, the machining accuracy and fit of the newly added components in the internal structure will lead to changes in the existing transmission chain design and control logic connections, which will adversely affect the reliability and functionality of the spring operating device. Therefore, the locking mechanism according to this utility model is suitable for adding a free trip function to new models of circuit breaker spring operating devices, as well as for upgrading the free trip function of existing circuit breaker spring operating devices, and has the characteristics of strong versatility.

[0100] It should be understood that although this specification describes various embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0101] The above description is merely an illustrative embodiment of this utility model and is not intended to limit the scope of this utility model. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of this utility model should fall within the protection scope of this utility model.

Claims

1. A locking mechanism for a spring-operated device of a circuit breaker, wherein the spring-operated device comprises a front plate, a middle plate, a rear plate, a tripping mechanism, and a closing mechanism arranged sequentially from the outside to the inside, wherein the tripping mechanism comprises a tripping half-shaft pivotally mounted to the front plate and a tripping device operatively connected to the tripping half-shaft, and the closing mechanism comprises a closing half-shaft pivotally mounted to the front plate, a closing device located on the front plate, and a closing tripping top plate operatively connected to the closing device and sleeved on the closing half-shaft, characterized in that... The locking mechanism includes: A drive plate pivotally mounted to a front panel, wherein the drive plate includes a body fixedly connected to a trip half-shaft and a connecting end protruding from the body; and A locking plate pivotally mounted to the front plate and arranged adjacent to the closing trip top plate, wherein the locking plate includes a driven end operatively connected to the connecting end and a locking end opposite thereto, wherein in response to the extension of the opening trip end actuating the opening half shaft to cause the moving contact of the circuit breaker to trip, the drive plate pivots to drive the locking plate to pivot to the locking position where the locking end abuts against the closing trip top plate.

2. The locking mechanism of the spring-operated device for a circuit breaker as described in claim 1, characterized in that, It also includes a mounting plate arranged adjacent to the closing trip top plate, wherein the mounting plate is provided with a pivot protruding from it, which allows the locking plate to pivot about it.

3. The locking mechanism of the spring-operated device for a circuit breaker as described in claim 1, characterized in that, The locking plate is designed as a generally L-shaped plate.

4. The locking mechanism of the spring-operated device for a circuit breaker as described in claim 1, characterized in that, The drive plate is designed with a slot of a predetermined length at its connecting end, and the locking plate has a protrusion accommodated in the slot at its driven end.

5. The locking mechanism of the spring-operated device for a circuit breaker as described in claim 1, characterized in that, The drive board body has a keyway through which the tripping half shaft passes, so that a non-rotation key connection is formed between the drive board and the tripping half shaft.

6. The locking mechanism of the spring-operated device for a circuit breaker as described in claim 1, characterized in that, It also includes a protruding post extending from the locking end of the locking plate, wherein the protruding post abuts against the tripping top plate when the locking plate is pivoted to the locking position.

7. The locking mechanism of the spring-operated device for a circuit breaker as described in claim 1, characterized in that, It also includes a reset spring sleeved on the tripping half shaft, wherein the reset spring is designed to reset the tripping half shaft when the tripping tripping end retracts, thereby causing the drive plate to pivot and drive the locking plate to pivot to the unlocking position where the locking end disengages from the closing tripping top plate.

8. The locking mechanism of the spring-operated device for a circuit breaker as described in claim 1, characterized in that, At least one of the drive plate and the locking plate is designed as a sheet metal part.

9. The locking mechanism of the spring-operated device for a circuit breaker as described in claim 1, characterized in that, The rotation angle of either the drive plate or the locking plate is no greater than 60 degrees.

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