Operating device for circuit breaker

Abstract

The invention discloses an operating device for a circuit breaker, which comprises a fixed frame, a plurality of vacuum arc-extinguishing chambers are transversely arranged and mounted in the fixed frame, and operating devices are mounted at the tops of the plurality of vacuum arc-extinguishing chambers in the fixed frame. The bottoms of the operating devices are connected with a moving contact conducting rod of the vacuum arc-extinguishing chamber through a pressing assembly, a rotating shaft is rotationally connected to the outer side of the upper portion of the fixing frame, the surface of the rotating shaft is connected with the multiple operating devices, and the portion, located between the two operating devices, of the surface of the rotating shaft is sleeved with an umbrella skirt. The outer wall of one end, close to the rotating shaft, of the fixed frame is provided with a gap opposite to the umbrella skirt, and the umbrella skirt is rotatably arranged in the gap. A traditional cam plate transmission structure is replaced, through a multi-arm linkage transmission mechanism composed of the rotating arm, the auxiliary arm, the connecting arm and the downward pressing arm, the length of a stress arm in the transmission process is optimized, the problem that the stress arm of a traditional structure is shortened in the overtravel pressing stage is solved, and the force transmission efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breaker, in particular to a kind of operating device for circuit breaker. BACKGROUND

[0002] As a compact high-voltage power distribution equipment, circuit breaker is widely used in urban power distribution network, industrial park and other places due to its small size, good insulation performance and adaptability to harsh environment.

[0003] As the core executive component of the circuit breaker in the vacuum switch device, the transmission reliability of the operating device directly determines the opening and closing performance of the vacuum arc chamber and the operation safety of the device. Currently, the existing operating device widely adopts a transmission structure of rotating shaft and cam plate to realize the opening and closing control of the contact. Specifically, the rotating shaft is driven to rotate, which in turn drives the cam plate fixed on the surface of the rotating shaft to rotate synchronously. The end of the pull rod cooperates with the profile curved surface of the cam plate to push or pull the pull rod to move linearly, thereby controlling the opening and closing actions of the moving contact and the static contact in the vacuum arc chamber.

[0004] In actual engineering applications, in order to ensure the contact reliability of the moving contact and the static contact after closing, prevent arc ablation due to poor contact, and establish stable contact pressure, the moving contact and the static contact of the vacuum arc chamber need to complete a certain stroke of pressing action (i.e. overtravel pressing) after completing the closing action. However, the profile design of the cam plate in the prior art only matches the stroke of the opening and closing action. During the pressing stroke after the pull rod drives the moving contact to complete the closing, the contact point of the cam plate and the pull rod has a shortened force arm and reduced transmission efficiency, resulting in insufficient pressing force, which cannot meet the design requirements of the vacuum arc chamber for overtravel pressing force. This defect not only affects the contact pressure stability of the moving contact and the static contact, but also reduces the breaking capacity and service life of the vacuum arc chamber, thereby limiting the application reliability of the entire operating device in high-voltage and high-power electrical engineering scenarios. SUMMARY

[0005] The present application aims to provide an operating device for circuit breaker to solve the problems in the background art.

[0006] In order to achieve the above object, the application provides the following technical scheme: A circuit breaker operating device, comprising a fixed frame, a plurality of vacuum interrupters are arranged transversely in the fixed frame, an operating device is arranged at the top of each vacuum interrupter in the fixed frame, a lower pressing assembly is connected between the bottom of the operating device and the movable contact conducting rod of the vacuum interrupter, a rotating shaft is rotatably connected to the outer side of the upper part of the fixed frame, the surface of the rotating shaft is connected to the operating devices, an umbrella skirt is sleeved on the surface of the rotating shaft between two operating devices, a notch is formed in the outer wall of the fixed frame near one end of the rotating shaft and opposite to the umbrella skirt, and an umbrella skirt is rotatably arranged in the notch.

[0007] Preferably, the operating device comprises a protective support, a rotating arm, an auxiliary arm, a lower pressing arm and a connecting arm, the protective support is fixed in the fixed frame by fasteners, the rotating arm is sleeved on the surface of the rotating shaft, the auxiliary arm is rotatably connected to the upper part of the protective support by a rotating shaft, one end of the connecting arm is connected to the rotating arm by a first connecting pin, the other end of the connecting arm is connected to the auxiliary arm by a second connecting pin, the bottom of the lower pressing arm is connected to the lower pressing assembly by a third connecting pin, and the top of the lower pressing arm is connected to the second connecting pin.

[0008] Preferably, the lower pressing assembly comprises a pull rod, a spring, a connecting seat and a fixed plate, the connecting seat is fixedly connected to the top of the pull rod, the fixed plate is fixedly connected to the lower surface of the pull rod, the spring is sleeved on the surface of the pull rod between the connecting seat and the fixed plate, and the spring abuts against the surfaces of the connecting seat and the fixed plate.

[0009] Preferably, the surface of the connecting seat is connected to the bottom surface of the lower pressing arm by a third connecting pin.

[0010] Preferably, the bottom of the pull rod is connected to the movable contact conducting rod of the vacuum interrupter.

[0011] Preferably, arc grooves are formed in the surface of the protective support at both ends for the second connecting pin to move, and guide grooves are formed in the surface of the protective support below both ends for the third connecting pin to move up and down.

[0012] Preferably, a grounding switch is rotatably connected to the lower part of the fixed frame, and a grounding knife switch matched with the grounding switch is arranged in the fixed frame in front of the grounding switch. Beneficial effects

[0013] Compared with the prior art, the application has the following beneficial effects: 1. The application discards the traditional cam plate transmission structure, and through the multi-arm linkage transmission mechanism composed of rotating arm, auxiliary arm, connecting arm and pressing-down arm, the movement track of the second connecting pin is limited in the arc slot on the protection support, which effectively optimizes the length of the force arm in the transmission process, avoids the problem of shortening of the force arm in the overtravel suppression stage of the traditional structure, and significantly improves the force transmission efficiency. When the device completes the closing action, the linkage mechanism can stably output sufficient overtravel suppression force, ensuring that the moving and static contacts of the vacuum arc chamber establish stable contact pressure, and from the root cause, solving the defects of poor contact and arc ablation caused by insufficient suppression force in the prior art, and further improving the breaking capacity and service life of the vacuum arc chamber.

[0014] 2. The umbrella skirt provided on the surface of the rotating shaft cooperates with the notch on the fixed frame, which can effectively balance the eccentric force generated by the synchronous action of multiple operating devices during rotation, reduce the vibration amplitude of the rotating shaft, avoid deformation or wear caused by uneven stress on the rotating shaft for a long time, and ensure the stability and reliability of the transmission of the entire operating device. At the same time, the setting of the umbrella skirt can effectively increase the creepage distance between the two operating devices, and the umbrella skirt is rotatably arranged in the notch, which reasonably utilizes the installation space without occupying the external volume of the equipment, meeting the compact design requirement of the circuit breaker.

[0015] 3. The setting of the spring in the pressing-down assembly in the application realizes the functions of elastic buffering and pressure compensation. During closing and overtravel suppression, the spring can absorb the impact load in the transmission process, reduce the hard impact on the moving contact conducting rod and the linkage mechanism, and reduce the wear of the parts; at the same time, the pre-tightening force of the spring can further supplement the overtravel suppression force, ensuring that the contact pressure of the moving and static contacts remains stable under different working conditions, and improving the adaptation ability of the device to complex working conditions such as voltage fluctuation and load change.

[0016] 4. Multiple operating devices are linked and controlled through the same rotating shaft, which can accurately ensure the synchronization of the opening and closing actions of multiple vacuum arc chambers, and avoid circuit failure caused by the lagging or leading of the action of a single arc chamber; the components of the operating device are connected through detachable structures such as connecting pins and rotating shafts, and the protection support is fixed to the fixed frame through fasteners, which is convenient for later maintenance and replacement of the parts, and reduces the maintenance cost and difficulty. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is the overall structure schematic diagram of the application; Figure 2 is the operating device and arc chamber cooperation structure schematic diagram of the application; Figure 3 is the pressing-down assembly and vacuum arc chamber cooperation structure schematic diagram of the application; Figure 4 is the operating device cooperation structure schematic diagram of the application.

[0018] The correspondence between the reference signs of the figures and the component names is as follows: 1. fixed frame; 2. rotating shaft; 3. operating device; 4. grounding switch; 5. grounding knife switch; 6. pressing assembly; 7. vacuum interrupter; 11. notch; 21. umbrella skirt; 31. protection support; 32. rotating arm; 33. auxiliary arm; 34. pressing arm; 35. connecting arm; 36. first connecting pin; 37. second connecting pin; 38. third connecting pin; 39. rotating shaft; 61. pull rod; 62. spring; 63. connecting seat; 64. fixed plate; 311. circular arc groove; 312. guide groove. DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] In the description of the present application, it should be noted that the terms "upper", "lower", "left", "right", "front", "back", "inner", "outer", "vertical", "horizontal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and should not be understood as indicating or implying relative importance.

[0021] As Figures 1-4It is a schematic diagram of the structure of an operating device for a circuit breaker, in this embodiment an operating device for a circuit breaker. It comprises a fixed frame 1 as the main support structure. Inside the fixed frame 1, a plurality of vacuum interrupters 7 are arranged in a transverse direction to form a multi-break arc extinguishing structure. Inside the fixed frame 1 and above the vacuum interrupters 7, a set of independent operating devices 3 is installed corresponding to each vacuum interrupter 7. A rotating shaft 2 is rotatably connected to the outside of the fixed frame 1 above by a bearing or the like structure, and its axial direction is parallel to the arrangement direction of the plurality of vacuum interrupters 7. The surface of the rotating shaft 2 is connected to all the operating devices 3, so that by driving the rotating shaft 2 to rotate, all the operating devices 3 can be controlled to act synchronously. In order to balance the eccentric force generated when the plurality of operating devices 3 act synchronously and to prevent the phenomenon of discharge arc between the operating devices 3 during the opening and closing process, an umbrella skirt 21 is fixedly sleeved between every two adjacent operating devices 3 on the surface of the rotating shaft 2. Correspondingly, a notch 11 is provided on the outer wall of the fixed frame 1 near the end of the rotating shaft 2, which is opposite to the umbrella skirt 21. When the umbrella skirt 21 rotates with the rotating shaft 2, part of its structure can rotate freely in the notch 11, which not only balances the function, but also saves external space. In addition, a grounding switch 4 is rotatably connected inside the fixed frame 1 directly below the vacuum interrupter 7, and a grounding knife switch 5 is installed at the front end of the grounding switch 4 to cooperate with it, which is used to realize the grounding function of the device.

[0022] In this embodiment, as shown in Figure 2 and Figure 4 , the specific structure of a single operating device 3 is described in detail. The operating device 3 mainly comprises a protective bracket 31, a rotating arm 32, an auxiliary arm 33, a pressing arm 34 and a connecting arm 35. The protective bracket 31 is fixed on the inner wall of the fixed frame 1 by bolts or other fasteners to provide protection and support for the transmission components inside. One end of the rotating arm 32 is fixedly sleeved on the surface of the rotating shaft 2 and rotates synchronously with the rotating shaft 2. The auxiliary arm 33 is rotatably connected to the upper position inside the protective bracket 31 through an independent rotating shaft 39. The connecting arm 35, as an intermediate connecting rod for power transmission, is hingedly connected to the free end of the rotating arm 32 through a first connecting pin 36 at one end and to the middle of the auxiliary arm 33 through a second connecting pin 37 at the other end. The top of the pressing arm 34 is hingedly connected to the second connecting pin 37, and the bottom is connected to the pressing assembly 6 through a third connecting pin 38. In order to accurately guide and limit the movement trajectory, circular arc grooves 311 are provided on the surface of the protective bracket 31 at both ends near the upper region of the rotating center of the auxiliary arm 33, corresponding to the transmission path, for the movement of the second connecting pin 37; long strip-shaped guide grooves 312 are provided on the swinging path of the pressing arm 34 for the up-and-down movement of the third connecting pin 38.

[0023] In this embodiment, as shown in Figure 3As shown, the lower pressing assembly 6 is used to convert the swing output of the operating device 3 into a linear pressing force on the moving contact of the vacuum interrupter 7, and to apply an elastic pressure. The lower pressing assembly 6 includes a pull rod 61, a spring 62, a connecting seat 63 and a fixed plate 64. The top of the pull rod 61 is fixedly connected with the connecting seat 63, and the surface of the connecting seat 63 is hingedly connected with the bottom of the lower pressing arm 34 through the third connecting pin 38. Below the shaft of the pull rod 61, the fixed plate 64 is fixedly connected. A spring 62 is sleeved outside the shaft of the pull rod 61 and located between the connecting seat 63 and the fixed plate 64, and the two ends of the spring 62 abut against the lower surface of the connecting seat 63 and the upper surface of the fixed plate 64, respectively. The bottom of the pull rod 61 is directly connected with the moving contact conducting rod inside the vacuum interrupter 7, and the connection mode of the pull rod 61 and the moving contact conducting rod inside the vacuum interrupter 7 is the prior art, so it will not be described in detail.

[0024] Working principle When the closing operation needs to be performed, the external driving mechanism (such as a motor or a manual mechanism) drives the rotating shaft 2 to rotate in a specific direction. The rotating shaft 2 drives all the rotating arms 32 fixed thereon to rotate synchronously. The rotating arm 32 pulls the connecting arm 35 through the first connecting pin 36, and the connecting arm 35 in turn drives the auxiliary arm 33 to rotate around the rotating shaft 39 thereof through the second connecting pin 37. In this process, the second connecting pin 37 slides in the circular arc groove 311 of the protective support 31, and its movement trajectory is constrained. Since the top of the lower pressing arm 34 is connected with the second connecting pin 37, and the bottom is hingedly connected with the lower pressing assembly 6 through the third connecting pin 38, and the third connecting pin 38 is limited to vertical movement in the guide groove 312, the rotation of the auxiliary arm 33 is finally converted into an approximate vertical downward pushing force on the bottom of the lower pressing arm 34. This force acts on the connecting seat 63 of the lower pressing assembly 6 through the third connecting pin 38, pushes the entire pull rod 61 to move downward, compresses the spring 62, and finally drives the moving contact conducting rod of the vacuum interrupter 7 to move downward, completing the contact with the static contact, i.e. the closing action.

[0025] After the moving and static contacts are contacted, the rotating shaft 2 continues to rotate by a small angle, entering the overtravel suppression stage. At this time, the traditional cam structure will cause the output force to drop due to the sharp shortening of the force arm. In the present application, through the multi-link mechanism composed of the rotating arm 32, the connecting arm 35, the auxiliary arm 33 and the lower pressing arm 34, and the trajectory design of the circular arc groove 311, the length of the transmission force arm remains relatively optimal during the overtravel suppression stage, so that sufficient suppression force can be continuously and stably output. The force is transmitted through the pull rod 61 and further compensated by the spring 62, ensuring that a stable and reliable contact pressure is established between the moving and static contacts.

[0026] When the breaker needs to be opened, the rotating shaft 2 rotates reversely. The connecting rod mechanisms move reversely, the pressing arms 34 are lifted up, the pressure on the pressing assembly 6 is released. At this time, the compressed spring 62 releases the stored energy, on one hand, it helps to push the pull rod 61 to reset quickly, on the other hand, its elastic force also helps to overcome the adhesion force between the contacts in the vacuum interrupter, so that the moving contact is separated from the static contact quickly under the driving of the pull rod 61, and the opening operation is completed.

[0027] During the whole process, the umbrella skirt 21 arranged on the rotating shaft 2 rotates with the rotating shaft, which can effectively balance the centrifugal force and vibration caused by the asymmetric layout or different motion synchronization of the plurality of operating devices 3, ensure the rotating shaft 2 to run stably, and reduce the abrasion and noise.

[0028] The above is a further detailed description of the present application in combination with the specific embodiments, and cannot be considered as limiting the specific embodiments of the present application to these descriptions. For the ordinary skilled in the art to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, which should be considered as belonging to the protection scope determined by the claims submitted by the present application.

Claims

1. An operating device for a circuit breaker, comprising a fixed frame (1), characterized in that: Multiple vacuum interrupters (7) are arranged horizontally inside the fixed frame (1). An operating device (3) is installed on the top of each of the multiple vacuum interrupters (7) inside the fixed frame (1). The bottom of the operating device (3) is connected to the moving contact conductive rod of the vacuum interrupter (7) through a pressing component (6). A rotating shaft (2) is rotatably connected to the upper outer side of the fixed frame (1). The surface of the rotating shaft (2) is connected to multiple operating devices (3). A skirt (21) is sleeved between two operating devices (3) on the surface of the rotating shaft (2). A notch (11) is opened on the outer wall of the fixed frame (1) near the rotating shaft (2) at the opposite position of the skirt (21), and the skirt (21) rotates inside the notch (11).

2. The operating device for a circuit breaker according to claim 1, characterized in that: The operating device (3) includes a protective bracket (31), a rotating arm (32), an auxiliary arm (33), a pressing arm (34), and a connecting arm (35). The protective bracket (31) is fixed in the fixed frame (1) by fasteners. The rotating arm (32) is sleeved on the surface of the rotating shaft (2). The auxiliary arm (33) is rotatably connected to the upper part of the protective bracket (31) by a rotating shaft (39). One end of the connecting arm (35) is connected to the rotating arm (32) by a first connecting pin (36). The other end of the connecting arm (35) is connected to the auxiliary arm (33) by a second connecting pin (37). The bottom of the pressing arm (34) is connected to the pressing assembly (6) by a third connecting pin (38). The top of the pressing arm (34) is connected to the second connecting pin (37).

3. The operating device for a circuit breaker according to claim 2, characterized in that: The pressing assembly (6) includes a pull rod (61), a spring (62), a connecting seat (63), and a fixing plate (64). The top of the pull rod (61) is fixedly connected to the connecting seat (63), and the bottom surface of the pull rod (61) is fixedly connected to the fixing plate (64). The spring (62) is sleeved between the connecting seat (63) and the fixing plate (64) on the surface of the pull rod (61), and the spring (62) abuts against the surfaces of the connecting seat (63) and the fixing plate (64).

4. The operating device for a circuit breaker according to claim 3, characterized in that: The surface of the connecting seat (63) is connected to the bottom surface of the lower pressure arm (34) via a third connecting pin (38).

5. The operating device for a circuit breaker according to claim 3, characterized in that: The bottom of the pull rod (61) is connected to the moving contact conductive rod of the vacuum interrupter (7).

6. The operating device for a circuit breaker according to claim 2, characterized in that: The protective bracket (31) has arc grooves (311) at both ends of its surface for the second connecting pin (37) to move, and guide grooves (312) at the lower ends of both ends of the protective bracket (311) for the third connecting pin (38) to move up and down.

7. The operating device for a circuit breaker according to claim 2, characterized in that: A grounding switch (4) is rotatably connected inside the fixed frame (1) directly below the vacuum interrupter (7), and a grounding knife switch (5) that cooperates with the grounding switch (4) is installed inside the fixed frame (1) at the front end of the grounding switch (4).

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