A transmission structure for a vacuum circuit breaker and a vacuum circuit breaker

Abstract

The application relates to the field of circuit breakers, in particular to a transmission structure for a vacuum circuit breaker and the vacuum circuit breaker. The transmission structure for the vacuum circuit breaker comprises a fixing base, a driving piece, a power output piece and a connecting rod assembly, the connecting rod assembly comprises two groups arranged symmetrically, each group comprises a first connecting rod and a second connecting rod hinged together, the fixing base is provided with two groups of elastic assemblies, the fixing base is provided with sliding grooves for inserting the end of the pin shaft, the sliding grooves gradually transition to the pressing end from the direction of the driving piece to the power output piece, so that when the driving piece drives the connecting rod assembly to close, the pin shafts of the two groups of connecting rod assemblies are away from each other through the limitation of the sliding grooves, and finally the connecting rod assemblies press the pressing end of the corresponding elastic assemblies, thereby solving the problem that in the closing and opening movement of the prior art, the closing-keeping spring moves together with the transmission structure, the driving mechanism is heavy, the required driving force is large, and the mechanical characteristics in the movement process are unstable.

Description

Technical Field

[0001] This invention relates to the field of circuit breakers, and more particularly to a transmission structure for a vacuum circuit breaker and a vacuum circuit breaker. Background Technology

[0002] Unlike the plug-in contact structure of conventional SF6 circuit breakers, vacuum circuit breakers currently employ a flat-to-flat butt-joint contact structure. Once the moving contact contacts the stationary contact, it stops moving forward. To ensure reliable contact between the moving and stationary contacts, a certain contact pressure is necessary. Generally, this contact pressure is primarily provided by the closing holding spring. The closing holding spring continues to compress after the moving and stationary contacts make contact, enabling the overtravel movement of the drive mechanism and providing the required contact pressure.

[0003] If the closing holding spring is located on the stationary end, bellows need to be installed on both the moving and stationary sides of the vacuum interrupter for electrical connection, making alignment difficult to guarantee, affecting current carrying capacity, and increasing size. Therefore, the closing holding spring of a vacuum circuit breaker is generally located on the moving end. For example, Chinese invention patent application CN114429881A discloses a vacuum circuit breaker in which an overtravel buffer device is provided on the moving conductive rod of the moving contact. That is, the contact spring (closing holding spring) is set in the contact spring sleeve, and the contact spring, as part of the transmission mechanism, drives the moving conductive rod to move. During the movement, the contact spring can be compressed to achieve the holding pressure between the moving and stationary contacts.

[0004] However, the sleeves of the closing holding spring and the fixed closing holding spring move together with the moving end, increasing the moving mass of the moving end, requiring more operating work, and necessitating a greater driving force from the drive mechanism. Furthermore, the springs deform during the opening and closing process, causing the moving contact to oscillate along its travel path, resulting in unstable mechanical characteristics during operation. Summary of the Invention

[0005] The purpose of this invention is to provide a transmission structure for a vacuum circuit breaker, which solves the problem that in the prior art, the closing holding spring moves with the transmission structure during the opening and closing motion, resulting in a large weight of the drive mechanism, which in turn requires a large driving force and unstable mechanical characteristics during the motion process; the purpose of this invention is also to provide a vacuum circuit breaker to solve the above technical problems.

[0006] To achieve the above objectives, the transmission structure for the vacuum circuit breaker in this invention adopts the following technical solution:

[0007] A transmission structure for a vacuum circuit breaker includes a fixed base, a driving member, a power output member, and a linkage assembly. The linkage assembly is disposed within the fixed base and comprises two symmetrically arranged sets, each set including a first linkage and a second linkage. One end of the first linkage and the second linkage are hinged together by a pin. The other end of both sets of first linkages is hinged to the driving member, which has a driving connection end for transmission connection with an operating mechanism. The other end of both sets of second linkages is hinged to the power output member, which has a connection end for transmission with a vacuum interrupter. The transmission connection end is connected to the moving end of the transmission; the fixed base is provided with elastic components arranged corresponding to each group of connecting rod assemblies. The elastic components have a pressing end for being pressed to produce elastic deformation. The fixed base is provided with a sliding groove for the end of the pin to be inserted. The sliding groove gradually transitions from the direction of the driving member to the power output member to the pressing end, so that when the driving member drives the connecting rod assembly to close the circuit, the pins of the two groups of connecting rod assemblies are moved away from each other by the limiting of the pins by the sliding groove, and finally the connecting rod assemblies press against the pressing end of the corresponding elastic component.

[0008] The beneficial effects of the above technical solution are as follows: This invention innovatively proposes a transmission structure for a vacuum circuit breaker. By setting a fixed base, the linkage assembly is set in the fixed base. Two sets of linkage assemblies are arranged symmetrically, and each set includes a first linkage and a second linkage. One end of the first linkage and the second linkage are hinged by a pin. The other end of the two sets of first linkages is hinged to the driving component, and the other end of the two sets of second linkages is hinged to the power output component, thereby forming a multi-link structure, which makes the movement more stable. Simultaneously, an elastic component fixed to the fixed base is provided so that the elastic component does not move with the moving end, reducing the weight of the moving end. In order to limit the movement path of the multi-link movement, a sliding groove is provided on the fixed base. The sliding groove gradually transitions from the driving component to the power output component towards the top pressure end. During the closing process, as the distance between the moving and stationary contacts shortens, the pins on the two sets of linkage assemblies move away from each other. The elastic component presses against the elastic component, which makes the pins on the two sets of linkage assemblies tend to move closer to each other, thus pushing the second linkage to continue moving, thereby generating pressure between the moving and stationary contacts. Since the sliding groove and the linkage assembly are connected by a rigid connection, shaking during the opening and closing movement is avoided. This solves the problem in the prior art where the closing holding spring moves with the transmission structure during the opening and closing movement, resulting in a large weight of the drive mechanism, which in turn requires a large driving force and has unstable mechanical characteristics during the movement.

[0009] Furthermore, the sliding groove includes a straight section and a retaining section that connects to the straight section and transitions to the top pressure end. The extension direction of the straight section is consistent with the opening and closing direction. The retaining section is an arc groove with the hinge point between the second connecting rod and the power output component as the center and the length from the hinge point to the pin as the radius.

[0010] The beneficial effects of the above technical solution are as follows: by setting a straight segment that is consistent with the opening and closing direction, the power output component is driven along with the movement of the drive component in the initial stage of the movement, and the movement efficiency is high; in addition, the setting of the holding segment in the form of an arc groove ensures that when the power output component moves to the position, it is in the closed position regardless of whether the drive component moves, reducing the requirements for the end position of the drive component's movement, that is, reducing the movement accuracy requirements of the drive rod.

[0011] Furthermore, the sliding groove also includes a transition section connecting the straight section and the holding section, the transition section being arc-shaped.

[0012] The beneficial effect of the above technical solution is that it avoids the pin from impacting in the sliding groove during movement, and allows the pin to move better from the straight section to the holding section.

[0013] Furthermore, the fixing base includes two layers of clamping plates, the sliding groove is a groove formed on the inner wall of the clamping plates, and the connecting rod assembly is located between the two layers of clamping plates.

[0014] The beneficial effects of the above technical solution are as follows: by setting grooves on the inner wall of the clamping plate to form a sliding groove, the manufacturing process is simple, and a space is formed between the two clamping plates to accommodate the connecting rod assembly, thus preventing the connecting rod in the connecting rod assembly from shaking.

[0015] Furthermore, the driving component includes a driving rod and a driving connector fixedly connected to the driving rod. The fixing base also includes a fixing plate fixed to one end of the two layers of clamping plates. The driving rod passes through the fixing plate. The driving connector is located between the two layers of clamping plates, and the two layers of clamping plates are respectively provided with avoidance holes for avoiding the driving connector.

[0016] The beneficial effects of the above technical solution are as follows: the setting of the fixing plate is conducive to fixing the position of the two clamping plates, and at the same time, it allows the drive rod to pass through, guiding and limiting the movement of the drive rod. Meanwhile, the drive rod in the drive component is easy to push and pull by the operating mechanism, and the drive joint is easy to hinge with the connecting rod assembly. In addition, the setting of the clearance hole makes the assembly simple and facilitates the movement of the drive head in the fixed seat. Furthermore, it is also easy to observe the position of the drive rod and the drive joint.

[0017] Furthermore, the inner walls of the two layers of clamps are respectively provided with the grooves mentioned above, so that the two ends of the pin can be inserted respectively.

[0018] The beneficial effect of the above technical solution is that both ends of the pin are set in the groove, so that the two ends of the pin are subjected to balanced force and the movement is more reliable.

[0019] Furthermore, two sets of sliding grooves are arranged opposite each other to allow the two ends of the pin to be inserted respectively.

[0020] The beneficial effects of the above technical solution are as follows: by setting two sets of sliding grooves, both ends of the pin are in the sliding grooves, so that the two ends of the pin are subjected to balanced force and the movement is more reliable.

[0021] Furthermore, the elastic component includes a fixed cylinder fixed on a fixed base, a piston rod disposed inside the fixed cylinder, and an elastic element mounted between the piston rod and the inner wall of the fixed cylinder, with the protruding end of the piston rod extending out of the fixed cylinder constituting the top pressure end.

[0022] The beneficial effects of the above technical solution are as follows: the fixed cylinder, piston rod and elastic element form an elastic component, the elastic element in the fixed cylinder pushes the piston rod, and the fixed cylinder and piston rod cooperate to limit the direction of piston rod extension and movement, thereby making the piston rod form a top-pressing connecting rod assembly. The piston rod is set to easily extend into the sliding groove, so that the elastic element is compressed after the driving component finishes moving, and has a preload force.

[0023] Furthermore, the elastic element is a spring.

[0024] The advantages of the above technical solution are that the springs come in a variety of specifications, and different specifications can be selected according to the required elastic force.

[0025] To achieve the above objectives, the vacuum circuit breaker in this invention adopts the following technical solution:

[0026] A vacuum circuit breaker includes a vacuum interrupter, an operating mechanism, and a transmission structure disposed between the vacuum interrupter and the operating mechanism. The transmission structure includes a fixed base, a driving member, a power output member, and a linkage assembly. The linkage assembly is disposed within the fixed base and comprises two symmetrically arranged sets, each set including a first linkage and a second linkage. One end of the first and second linkages is hinged to each other by a pin. The other end of both sets of first linkages is hinged to the driving member. The driving member has a driving connection end for transmission connection with the operating mechanism. The other end of both sets of second linkages is hinged to the power output member. The hinged power output component has a transmission connection end for transmission connection with the moving end of the vacuum interrupter; the fixed base is provided with elastic components corresponding to each group of connecting rod assemblies, the elastic components have a pressing end for being pressed to produce elastic deformation, the fixed base is provided with a sliding groove for the end of the pin to be inserted, the sliding groove gradually transitions from the direction of the driving component to the power output component to the pressing end, so that when the driving component drives the connecting rod assembly to close the circuit, the pins of the two groups of connecting rod assemblies are moved away from each other by the limiting of the pins by the sliding groove, and finally the connecting rod assemblies press against the pressing end of the corresponding elastic component respectively.

[0027] The beneficial effects of the above technical solution are as follows: This invention innovatively proposes a transmission structure for a vacuum circuit breaker. By setting a fixed base, the linkage assembly is set in the fixed base. Two sets of linkage assemblies are arranged symmetrically, and each set includes a first linkage and a second linkage. One end of the first linkage and the second linkage are hinged by a pin. The other end of the two sets of first linkages is hinged to the driving component, and the other end of the two sets of second linkages is hinged to the power output component, thereby forming a multi-link structure, which makes the movement more stable. Simultaneously, an elastic component fixed to the fixed base is provided so that the elastic component does not move with the moving end, reducing the weight of the moving end. In order to limit the movement path of the multi-link movement, a sliding groove is provided on the fixed base. The sliding groove gradually transitions from the driving component to the power output component towards the top pressure end. During the closing process, as the distance between the moving and stationary contacts shortens, the pins on the two sets of linkage assemblies move away from each other. The elastic component presses against the elastic component, which makes the pins on the two sets of linkage assemblies tend to move closer to each other, thus pushing the second linkage to continue moving, thereby generating pressure between the moving and stationary contacts. Since the sliding groove and the linkage assembly are connected by a rigid connection, shaking during the opening and closing movement is avoided. This solves the problem in the prior art where the closing holding spring moves with the transmission structure during the opening and closing movement, resulting in a large weight of the drive mechanism, which in turn requires a large driving force and has unstable mechanical characteristics during the movement.

[0028] Furthermore, the sliding groove includes a straight section and a retaining section that connects to the straight section and transitions to the top pressure end. The extension direction of the straight section is consistent with the opening and closing direction. The retaining section is an arc groove with the hinge point between the second connecting rod and the power output component as the center and the length from the hinge point to the pin as the radius.

[0029] The beneficial effects of the above technical solution are as follows: by setting a straight segment that is consistent with the opening and closing direction, the power output component is driven along with the movement of the drive component in the initial stage of the movement, and the movement efficiency is high; in addition, the setting of the holding segment in the form of an arc groove ensures that when the power output component moves to the position, it is in the closed position regardless of whether the drive component moves, reducing the requirements for the end position of the drive component's movement, that is, reducing the movement accuracy requirements of the drive rod.

[0030] Furthermore, the sliding groove also includes a transition section connecting the straight section and the holding section, the transition section being arc-shaped.

[0031] The beneficial effect of the above technical solution is that it avoids the pin from impacting in the sliding groove during movement, and allows the pin to move better from the straight section to the holding section.

[0032] Furthermore, the fixing base includes two layers of clamping plates, the sliding groove is a groove formed on the inner wall of the clamping plates, and the connecting rod assembly is located between the two layers of clamping plates.

[0033] The beneficial effects of the above technical solution are as follows: by setting grooves on the inner wall of the clamping plate to form a sliding groove, the manufacturing process is simple, and a space is formed between the two clamping plates to accommodate the connecting rod assembly, thus preventing the connecting rod in the connecting rod assembly from shaking.

[0034] Furthermore, the driving component includes a driving rod and a driving connector fixedly connected to the driving rod. The fixing base also includes a fixing plate fixed to one end of the two layers of clamping plates. The driving rod passes through the fixing plate. The driving connector is located between the two layers of clamping plates, and the two layers of clamping plates are respectively provided with avoidance holes for avoiding the driving connector.

[0035] The beneficial effects of the above technical solution are as follows: the setting of the fixing plate is conducive to fixing the position of the two clamping plates, and at the same time, it allows the drive rod to pass through, guiding and limiting the movement of the drive rod. Meanwhile, the drive rod in the drive component is easy to push and pull by the operating mechanism, and the drive joint is easy to hinge with the connecting rod assembly. In addition, the setting of the clearance hole makes the assembly simple and facilitates the movement of the drive head in the fixed seat. Furthermore, it is also easy to observe the position of the drive rod and the drive joint.

[0036] Furthermore, the inner walls of the two layers of clamps are respectively provided with the grooves mentioned above, so that the two ends of the pin can be inserted respectively.

[0037] The beneficial effect of the above technical solution is that both ends of the pin are set in the groove, so that the two ends of the pin are subjected to balanced force and the movement is more reliable.

[0038] Furthermore, two sets of sliding grooves are arranged opposite each other to allow the two ends of the pin to be inserted respectively.

[0039] The beneficial effects of the above technical solution are as follows: by setting two sets of sliding grooves, both ends of the pin are in the sliding grooves, so that the two ends of the pin are subjected to balanced force and the movement is more reliable.

[0040] Furthermore, the elastic component includes a fixed cylinder fixed on a fixed base, a piston rod disposed inside the fixed cylinder, and an elastic element mounted between the piston rod and the inner wall of the fixed cylinder, with the protruding end of the piston rod extending out of the fixed cylinder constituting the top pressure end.

[0041] The beneficial effects of the above technical solution are as follows: the fixed cylinder, piston rod and elastic element form an elastic component, the elastic element in the fixed cylinder pushes the piston rod, and the fixed cylinder and piston rod cooperate to limit the direction of piston rod extension and movement, thereby making the piston rod form a top-pressing connecting rod assembly. The piston rod is set to easily extend into the sliding groove, so that the elastic element is compressed after the driving component finishes moving, and has a preload force.

[0042] Furthermore, the elastic element is a spring.

[0043] The advantages of the above technical solution are that the springs come in a variety of specifications, and different specifications can be selected according to the required elastic force. Attached Figure Description

[0044] Figure 1 This is a cross-sectional view (closed position) of the transmission structure in Embodiment 1 of the vacuum circuit breaker of the present invention;

[0045] Figure 2 This is a cross-sectional view (rigidly engaged position) of the transmission structure in Embodiment 1 of the vacuum circuit breaker of the present invention;

[0046] Figure 3 This is a cross-sectional view of the transmission structure in Embodiment 1 of the vacuum circuit breaker of the present invention (during opening or closing).

[0047] Figure 4 This is a cross-sectional view (opening position) of the transmission structure in Embodiment 1 of the vacuum circuit breaker of the present invention;

[0048] Figure 5 This is a schematic diagram of the fixing plate structure in Embodiment 1 of the vacuum circuit breaker of the present invention;

[0049] Figure 6 This is a schematic diagram of the groove in Embodiment 1 of the vacuum circuit breaker of the present invention;

[0050] Figure 7 This is a partial view of Embodiment 1 of the vacuum circuit breaker in this invention;

[0051] Figure 8 This is a perspective view of the transmission structure of Embodiment 1 of the vacuum circuit breaker in this invention.

[0052] In the diagram: 11. Clamping plate; 12. Fixing plate; 2. Power output component; 31. First connecting rod; 32. Second connecting rod; 33. Pin; 41. Drive rod; 42. Drive connector; 5. Sliding groove; 51. Straight section; 52. Transition section; 53. Holding section; 61. Fixing cylinder; 62. Piston rod; 63. Spring. Detailed Implementation

[0053] The features and performance of the present invention will be further described in detail below with reference to embodiments.

[0054] Embodiment 1 of the vacuum circuit breaker in this invention:

[0055] In this embodiment, a linkage assembly is provided between the driving component and the power output component. The linkage assembly has two sets, and each set has a first linkage and a second linkage. Since the first linkage and the second linkage in each set are hinged by a pin, and the pin is set in a sliding groove in the fixed seat, the power output component moves with the driving component. A spring assembly is provided on the fixed seat to press the linkage assembly, so that the power output component has a tendency to continue moving. Therefore, there is a closing holding force between the moving and stationary contacts. The movement mode of the linkage prevents wobbling during the movement. The setting of the elastic component prevents the transmission structure from moving with the spring assembly, thereby reducing the magnitude of the driving force.

[0056] Specifically, the circuit breaker includes a vacuum interrupter, an operating mechanism, and a transmission structure. One end of the transmission structure is connected to the operating mechanism, and the other end is connected to the moving end of the vacuum interrupter.

[0057] Specifically, such as Figure 1 and Figure 8 As shown, the transmission structure includes a fixed base, a driving component, a power output component 2, a connecting rod assembly, and an elastic component. The fixed base includes two layers of spaced clamping plates 11. A fixing plate 12 is fixedly installed at one end of the two layers of clamping plates 11. The fixing plate 12 has spaced grooves for inserting the ends of the two layers of clamping plates 11 into the grooves. Bolts (not shown in the figure) are also provided at the other end of the two layers of clamping plates 11 for fixing the two layers of clamping plates 11. The fixing plate 12 and the bolts keep the two layers of clamping plates 11 at a certain distance. Grooves are provided on the inner wall of the clamping plates 11 to form sliding grooves. Correspondingly, the connecting rod assembly is also arranged between the two layers of clamping plates 11.

[0058] The driving component includes a drive rod 41 and a drive connector 42. A through hole is provided on the fixed plate 12 for the drive rod 41 to pass through, allowing the drive rod 41 to reciprocate axially under the action of the through hole. One end of the drive rod 41 has a drive connection end for connecting to the operating mechanism of the vacuum circuit breaker. The drive connector 42 is located at the other end of the drive rod 41. The drive connector 42 is disposed between two clamping plates 11, and each of the two clamping plates 11 has a clearance hole to avoid obstructing the drive connector 42 during movement. The drive connector 42 also has a connection hole for connecting to the connecting rod assembly.

[0059] like Figure 1 and Figure 7As shown, the linkage assembly comprises two sets, which are completely symmetrical. Each set includes a first link 31 and a second link 32 hinged together by a pin 33. Both links have hinge holes at both ends, and the two links overlap at the hinge point. The pin 33 passes through both links and protrudes from their surfaces. The first links 31 of both sets are hinged to the drive connector 42, and the second links 32 of both sets are hinged to the power output component 2. The power output component 2 has a transmission connection end that is connected to the moving end of the vacuum interrupter via a hinge. The two ends of the pin 33 extend into sliding grooves formed by grooves on the inner walls of the side clamps 11, and move along the trajectory defined by the sliding grooves.

[0060] like Figure 5 and Figure 6 As shown, the sliding groove gradually transitions from the driving member to the power output member 2 towards the spring assembly, so that when the driving member drives the connecting rod assembly to close the circuit, the sliding groove limits the pin 33, causing the pins 33 of the two sets of connecting rod assemblies to move away from each other. Specifically, there are two sets of sliding grooves arranged symmetrically, and the two sliding grooves on each clamp are also arranged symmetrically. The sliding groove includes a straight section 51, a transition section 52, and a holding section 53. In this embodiment, the extension direction of the straight section 51 is consistent with the opening and closing direction, and it is located between the drive joint 42 and the power output component 2. This results in higher movement efficiency of the pin 33 within this section. The retaining section 53 is an arc groove with the hinge point between the second connecting rod 32 and the power output component 2 as the center and the length from the hinge point to the pin 33 as the radius. When the pin 33 is located within the retaining section 53, even if the drive rod continues to move, the power output component 2 will remain in the same position. An arc-shaped transition section 52 is also provided between the straight section 51 and the retaining section 53 to avoid impact when the pin transitions from the straight section 51 to the retaining section 53. It is worth noting that the width of the retaining section 53 of the sliding groove is greater than the diameter of the pin 33, so that the pin 33 and the retaining section 53 are in clearance fit. This allows the force to be transmitted between the moving end and the stationary end when the elastic component acts on the connecting rod assembly, rather than only acting on the sliding groove.

[0061] The aforementioned elastic components are also provided on both sides of the fixed base. Specifically, the elastic components include a fixed cylinder 61, a piston rod 62, and an elastic element. In this embodiment, the elastic element is a spring 63. The piston rod 62 is slidably disposed inside the fixed cylinder 61, and a portion of the piston rod 62 extends out of the fixed cylinder 61 to form a top pressure end. One end of the spring 63 abuts against the inner wall of the fixed cylinder 61, and the other end abuts against the piston rod 62, so that the top pressure end of the piston rod 62 extends between the two clamping plates 11. When the pin 33 moves into the holding section 53 of the sliding groove, it will squeeze the piston rod 62 and the spring 63 as it continues to move, causing the spring 63 to be compressed and elastically deformed, thereby generating a reaction force that brings the pins 33 on the two sets of connecting rod assemblies closer to each other. Since the sliding groove and the pin 33 are in clearance fit, the force will be transmitted to the second connecting rod 32, thereby pushing the power output component 2 to generate a force that continuously acts on the moving end of the arc extinguishing chamber.

[0062] When performing the closing action, firstly as follows: Figure 4 As shown, at this time, the moving end of the arc-extinguishing chamber is in the open position, the drive rod 41 is not moving, and the pin 33 is in the straight section 51 of the sliding groove, away from the end of the transition section 52. At this time, the straight lines of the first connecting rod 31 and the second connecting rod 32 coincide, and the motion efficiency is the highest. As the drive rod 41 moves, the transmission structure is in Figure 3 At the position shown, pin 33 has moved to the intersection of straight segment 51 and transition segment 52. The drive rod then continues to move, during which pin 33 slides within transition segment 52. Guided by transition segment 52, the pins 33 on the two sets of connecting rod assemblies move away from each other, causing the first connecting rod 31 and the second connecting rod 32 to form a certain angle. (See figure) Figure 2 As shown, pin 33 is located at the junction of the transition section and the holding section. After further movement, pin 33 disengages from the transition section 52 and enters the holding section 53. The holding section 53 is a special arc segment, so the movement of pin 33 within the holding section 53 will not cause a change in the position of the power output component 2. During the movement, it compresses the piston rod 62 and the spring 63 that abuts against the piston rod 62, causing the spring 63 to be compressed. As the movement progresses, it enters the... Figure 1 At the position shown, the drive rod 41 stops moving. Since the spring 63 is compressed, the spring 63 pushes the piston rod 62, which in turn causes the piston rod 62 to generate a spring force on the connecting rod assembly, thereby maintaining the contact pressure between the moving and stationary contacts through the connecting rod assembly.

[0063] In Embodiment 2 of the vacuum circuit breaker of the present invention, a new arrangement is proposed for the spring arrangement within the elastic component. Specifically, unlike Embodiment 1 where the spring is arranged inside the fixed cylinder, the elastic component in this embodiment is elastic rubber.

[0064] In Embodiment 3 of the vacuum circuit breaker of the present invention: Regarding the arrangement of the elastic component, this embodiment proposes a new arrangement. Specifically, unlike Embodiment 1, which includes a fixed cylinder fixed to a fixed base and a piston rod and spring inside the fixed cylinder, the elastic component in this embodiment only includes a spring. The spring is arranged in the holding section of the sliding groove, with one end abutting and fixed to the end of the holding section, and the other end abutting against the connecting rod assembly. When the pin moves into the holding section, it compresses the spring, thereby causing the spring to generate a reaction force that pushes the connecting rod assembly.

[0065] In Embodiment 4 of the vacuum circuit breaker of this invention, a new arrangement is proposed for the mounting base. Specifically, unlike Embodiment 1 where the mounting base includes two spaced-apart plates, in this embodiment the mounting base is integrally formed. The mounting base has a cavity to accommodate the connecting rod assembly, and a through sliding groove is provided on the mounting base. During installation, the first and second connecting rods are first placed into the cavity, then the pin is passed sequentially through the sliding groove of the mounting base and the two connecting rods, finally engaging with the other side of the mounting base. The sliding groove can be provided on one side or both sides.

[0066] In Embodiment 5 of the vacuum circuit breaker of the present invention: Regarding the arrangement of the sliding groove, this embodiment proposes a new arrangement. Specifically, unlike Embodiment 1, where grooves are provided on both layers of clamping plates to form the sliding groove, this embodiment provides a groove only on one side of the clamping plate.

[0067] In Embodiment 6 of the vacuum circuit breaker of the present invention: Regarding the arrangement of the driving component, this embodiment proposes a new arrangement. Specifically, the driving component is a T-shaped driving plate, the T-shaped head is used for hinged connection with the first link of the linkage assembly, and the other end of the driving plate is connected to the operating mechanism. At this time, the driving plate is set between two layers of clamping plates, and it is not necessary to provide clearance holes on the fixed base.

[0068] In Embodiment 7 of the vacuum circuit breaker of the present invention: Regarding the setting of the transition section, this embodiment proposes a new arrangement. Specifically, unlike the arc-shaped transition section set in Embodiment 1, this embodiment sets the transition section as an oblique line extending from the straight section to the holding section, with the straight section and the transition section arranged at an obtuse angle. Of course, in other embodiments, the transition section may not be set, and the straight section can move directly to the holding section.

[0069] In Embodiment 8 of the vacuum circuit breaker of this invention: Regarding the arrangement of the sliding groove, this embodiment proposes a new arrangement. Specifically, unlike Embodiment 1 where the sliding groove includes a straight section and a holding section, in this embodiment the sliding groove is inclined, and the two sliding grooves on one side of the clamping plate are arranged in a figure-eight shape. As the closing movement occurs, the pin moves away from each other within the sliding groove. As the pin moves, the power output component also moves accordingly. When the moving end moves to the closing position, the driving component stops moving. At this time, under the action of the elastic component, the power output component also tends to move towards the stationary end, so that the stationary end and the moving end of the arc-extinguishing chamber are pressed together.

[0070] An embodiment of the transmission structure for a vacuum circuit breaker in this invention is as follows: the transmission structure for a vacuum circuit breaker is the same as the transmission structure in any embodiment of the vacuum circuit breaker in this invention, and will not be repeated here.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A transmission structure for a vacuum circuit breaker, characterized in that: The system includes a fixed base, a drive component, a power output component, and two symmetrically arranged sets of linkage assemblies. Each linkage assembly is housed within the fixed base. Each linkage assembly includes a first link and a second link, one end of which is hinged to the first link and the second link via a pin. The other end of both first links is hinged to the drive component, which has a drive connection end for transmission connection with an operating mechanism. The other end of both second links is hinged to the power output component, which has a transmission connection end for transmission connection with the moving end of a vacuum interrupter. The fixed base is provided with elastic components corresponding to each linkage assembly. Each elastic component has a pressing end for being pressed to produce elastic deformation. The fixed base is provided with... The sliding groove inserted into the end of the pin gradually transitions from the driving member to the power output member towards the top pressure end. This allows the pins of the two sets of connecting rod assemblies to move away from each other when the driving member drives the connecting rod assembly to close the circuit. Ultimately, the connecting rod assemblies press against the top pressure end of the corresponding elastic component. The sliding groove includes a straight section and a holding section that connects to the straight section and transitions towards the top pressure end. The straight section extends in the same direction as the opening and closing direction. The holding section is an arc groove with the hinge point between the second connecting rod and the power output member as the center and the length from the hinge point to the pin as the radius. The sliding groove also includes a transition section connecting the straight section and the holding section, which is arc-shaped.

2. The transmission structure for a vacuum circuit breaker according to claim 1, characterized in that: The fixed base includes two layers of clamping plates, the sliding groove is a groove formed on the inner wall of the clamping plates, and the connecting rod assembly is located between the two layers of clamping plates.

3. The transmission structure for a vacuum circuit breaker according to claim 2, characterized in that: The driving component includes a driving rod and a driving connector fixedly connected to the driving rod. The fixing base also includes a fixing plate fixed to one end of the two layers of clamping plates. The driving rod passes through the fixing plate. The driving connector is located between the two layers of clamping plates, and the two layers of clamping plates are respectively provided with avoidance holes for avoiding the driving connector.

4. The transmission structure for a vacuum circuit breaker according to claim 2, characterized in that: The inner walls of the two layers of clamping plates are respectively provided with grooves for the two ends of the pin to be inserted.

5. The transmission structure for a vacuum circuit breaker according to claim 1, characterized in that: Two sets of sliding grooves are arranged opposite each other, so that the two ends of the pin can be inserted respectively.

6. The transmission structure for a vacuum circuit breaker according to claim 1, characterized in that: The elastic component includes a fixed cylinder fixed on a fixed base, a piston rod disposed inside the fixed cylinder, and an elastic element mounted between the piston rod and the inner wall of the fixed cylinder. The protruding end of the piston rod extending out of the fixed cylinder constitutes the top pressure end.

7. The transmission structure for a vacuum circuit breaker according to claim 6, characterized in that: The elastic element is a spring.

8. A vacuum circuit breaker, comprising a vacuum interrupter, an operating mechanism, and a transmission structure disposed between the vacuum interrupter and the operating mechanism, characterized in that: The transmission structure includes a fixed base, a driving component, a power output component, and two symmetrically arranged sets of connecting rod assemblies. The connecting rod assemblies are housed within the fixed base. Each set of connecting rod assemblies includes a first connecting rod and a second connecting rod. One end of the first and second connecting rods is hinged to each other via a pin. The other end of both sets of first connecting rods is hinged to the driving component, which has a driving connection end for transmission connection with the operating mechanism. The other end of both sets of second connecting rods is hinged to the power output component, which has a transmission connection end for transmission connection with the moving end of the vacuum interrupter. The fixed base is provided with elastic components corresponding to each set of connecting rod assemblies. Each elastic component has a pressing end for being pressed to produce elastic deformation. The fixed base is also provided with… A sliding groove is provided for insertion into the end of the pin. The sliding groove gradually transitions from the driving member to the power output member towards the pressing end, so that when the driving member drives the linkage assembly to close the circuit, the sliding groove limits the pin of the two sets of linkage assemblies to move away from each other, and finally the linkage assembly presses against the pressing end of the corresponding elastic component. The sliding groove includes a straight section and a holding section that connects to the straight section and transitions to the pressing end. The extension direction of the straight section is consistent with the opening and closing direction. The holding section is an arc groove with the hinge point between the second linkage and the power output member as the center and the length from the hinge point to the pin as the radius. The sliding groove also includes a transition section connecting the straight section and the holding section. The transition section is arc-shaped.

9. The vacuum circuit breaker according to claim 8, characterized in that: The fixed base includes two layers of clamping plates, the sliding groove is a groove formed on the inner wall of the clamping plates, and the connecting rod assembly is located between the two layers of clamping plates.

10. The vacuum circuit breaker according to claim 9, characterized in that: The driving component includes a driving rod and a driving connector fixedly connected to the driving rod. The fixing base also includes a fixing plate fixed to one end of the two layers of clamping plates. The driving rod passes through the fixing plate. The driving connector is located between the two layers of clamping plates, and the two layers of clamping plates are respectively provided with avoidance holes for avoiding the driving connector.

11. The vacuum circuit breaker according to claim 9, characterized in that: The inner walls of the two layers of clamping plates are respectively provided with grooves for the two ends of the pin to be inserted.

12. The vacuum circuit breaker according to claim 8, characterized in that: Two sets of sliding grooves are arranged opposite each other, so that the two ends of the pin can be inserted respectively.

13. The vacuum circuit breaker according to claim 8, characterized in that: The elastic component includes a fixed cylinder fixed on a fixed base, a piston rod disposed inside the fixed cylinder, and an elastic element mounted between the piston rod and the inner wall of the fixed cylinder. The protruding end of the piston rod extending out of the fixed cylinder constitutes the top pressure end.

14. The vacuum circuit breaker according to claim 13, characterized in that: The elastic element is a spring.

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