A circuit breaker vacuum arc extinguishing chamber opening and closing linkage mechanism

Abstract

The utility model relates to a kind of circuit breaker vacuum arc-extinguishing chamber opening and closing linkage mechanism, including installation box body, and installation box body is equipped with installation shaft, middle connecting rod, middle crooked arm, lifting driving arm and operating mechanism, wherein installation shaft is equipped with main crooked arm and driven crooked arm, and the main crooked arm is rotated by operating mechanism drive, the driven crooked arm, middle connecting rod, middle crooked arm and lifting driving arm are sequentially articulated;First hinged axle between middle connecting rod and middle crooked arm is connected with fixed shaft arranged in installation box body by opening spring;The installation box body is equipped with installation riser and buffer, and lifting driving arm upper end is equipped with lifting slide axle and is matched with lifting guide sliding slot arranged on installation riser, buffer is arranged in lifting driving arm lower side;The lifting slide axle is connected with insulating pull rod.The utility model can guarantee the action reliability and service life of electrified railway traction power supply system circuit breaker mechanism.

Description

Technical Field

[0001] This utility model relates to the field of power equipment, specifically a circuit breaker vacuum interrupter opening and closing linkage mechanism. Background Technology

[0002] Electrified railway traction power supply systems typically require multiple circuit breaker devices. For example, patent CN202121323U discloses an external power supply system for an electrified railway traction substation, which, in addition to circuit breakers on the newly constructed line side, also requires sectional circuit breakers between two busbar sections. Furthermore, improving the operational reliability and service life of circuit breaker mechanisms is a crucial consideration in electrified railway traction power supply systems. Existing circuit breaker devices are mostly designed for indoor use, and their spring operating mechanisms are usually directly connected to the vacuum interrupter via an insulating pull rod assembly. This structure often fails to meet the reliability requirements of circuit breakers used in outdoor electrified railway traction power supply systems. Utility Model Content

[0003] The purpose of this utility model is to provide a circuit breaker vacuum interrupter chamber opening and closing linkage mechanism, which can ensure the operational reliability and service life of the circuit breaker mechanism in the electrified railway traction power supply system.

[0004] The objective of this utility model is achieved through the following technical solution: A circuit breaker vacuum interrupter opening and closing linkage mechanism includes a mounting housing, and the mounting housing is provided with a mounting shaft, an intermediate connecting rod, an intermediate crank arm, a lifting drive arm, and an operating mechanism. The mounting shaft has a main crank arm and a driven crank arm, and the main crank arm is driven to rotate by the operating mechanism. The driven crank arm, intermediate connecting rod, intermediate crank arm, and lifting drive arm are sequentially hinged. A first hinge shaft between the intermediate connecting rod and the intermediate crank arm is connected to a fixed shaft located within the mounting housing via a opening spring. The mounting housing is provided with a mounting plate and a buffer. The upper end of the lifting drive arm has a lifting slide shaft that engages with a lifting guide groove located on the mounting plate. The buffer is located below the lifting drive arm. The lifting slide shaft is connected to an insulating pull rod.

[0005] One end of the intermediate connecting rod is rotatably connected to the driven crank arm via a crank arm hinge, and the other end is rotatably connected to one end of the intermediate crank arm via a first hinge. The intermediate crank arm rotates around the central pivot, and the end of the intermediate crank arm away from the first hinge is rotatably connected to the lower end of the lifting drive arm via a second hinge.

[0006] One end of the spring is attached to the first hinge shaft via a first hook, and the other end is attached to the spring attaching member via a second hook. The spring attaching member has a threaded connection at the end away from the spring. An adjusting bolt is provided on the fixed shaft, and the adjusting bolt is threadedly connected to the threaded connection.

[0007] Both ends of the lifting shaft are equipped with pulleys, and the pulleys respectively cooperate with the lifting guide grooves on the corresponding side mounting plate.

[0008] The lower end of the lifting drive arm is equipped with a buffer pressure roller that contacts the buffer.

[0009] The lifting slide shaft is provided with a lifting connecting rod, and the lower end of the insulating pull rod is provided with a lower connecting rod, and the lifting connecting rod is fixedly connected to the lower connecting rod.

[0010] An insulating frame is provided on the upper side of the mounting box. An insulating tie rod and a vacuum interrupter are both located in the insulating frame. The insulating frame includes an upper conductive plate and a lower conductive plate. An upper insulating support column and a vacuum interrupter are provided between the upper and lower conductive plates. A lower insulating support column and an insulating tie rod are provided between the lower conductive plate and the mounting box. The upper end of the stationary conductive rod of the vacuum interrupter is electrically connected to the upper conductive plate. The lower end of the moving conductive rod of the vacuum interrupter is connected to the insulating tie rod. The lower end of the moving conductive rod is provided with a flexible connection to a current transformer.

[0011] The lower end of the moving conductive rod is provided with a conductive clamp, and one side of the conductive clamp is fixedly connected to the flexible connection. The lower end of the conductive clamp is connected to the spring pressure block by bolts. The upper end of the insulating pull rod is provided with a spring receiving cavity, and a spring is provided in the spring receiving cavity. The spring pressure block is located in the spring receiving cavity and abuts against the spring. The upper end of the spring receiving cavity is provided with an insulating limiting block to prevent the spring pressure block from disengaging.

[0012] The advantages and positive effects of this utility model are as follows: 1. This utility model utilizes a driven crank arm, an intermediate connecting rod, an intermediate crank arm, and a lifting drive arm to convert the rotational motion of the main crank arm into the lifting motion of the insulating pull rod. This ensures that the vacuum interrupter, which is the core component of the circuit breaker body, can achieve precise, low-loss, and highly consistent opening and closing operations, thereby ensuring the operational reliability and service life of the entire circuit breaker body.

[0013] 2. In this invention, the first hinge shaft located between the intermediate connecting rod and the intermediate crank arm is connected to a fixed shaft inside the mounting housing via a tripping spring. The energy released by the tripping spring can act on the intermediate crank arm, thereby pulling down the insulating rod through the lifting drive arm to achieve the tripping action of the vacuum interrupter. Furthermore, since the tripping spring acts directly on the intermediate crank arm, its energy is almost directly used for the downward pulling action of the moving conductive rod of the vacuum interrupter. This provides a higher initial acceleration, making the tripping process of the vacuum interrupter faster, which helps to shorten the tripping time. It also reduces the key connection load on the mounting shaft with the main crank arm and the driven crank arm, allowing its main function to focus only on closing and position holding, thereby improving the mechanical life and reliability of the mechanism.

[0014] 3. One end of the opening spring of this utility model is connected to the fixed shaft through the opening spring connector. The front end of the opening spring connector is provided with a threaded connection part. The fixed shaft is provided with an adjusting bolt, and the adjusting bolt is threadedly connected to the threaded connection part. Tightening the adjusting bolt can precisely adjust the preload of the opening spring, which can ensure that the energy provided by the opening spring can ensure the opening action of the vacuum interrupter.

[0015] 4. Unlike traditional designs that use a buffer at the mounting shaft where the main crank arm and driven crank arm are located, this utility model has a buffer located below the lifting drive arm. This effectively absorbs the remaining kinetic energy and impact force at the end of the vacuum interrupter's opening, ensuring a smooth and non-jumping stop, thus protecting the entire operating mechanism and the vacuum interrupter's reliable opening. In addition, this utility model directly buffers the intermediate crank arm and lifting drive arm during the movement process, rather than addressing the issue at the end mounting shaft. This significantly reduces the mechanical stress of the entire operating mechanism, thereby improving the mechanism's reliability and mechanical life.

[0016] 5. The present invention has a lifting slide shaft at the upper end of the lifting drive arm, and both ends of the lifting slide shaft are provided with pulleys that cooperate with the lifting guide slide grooves on the corresponding side mounting plates to slide. The above structure can ensure that the upper end of the lifting drive arm can be lifted vertically, thereby ensuring that the insulating tie rod can be lifted vertically. At the same time, the cooperation between the pulleys and the lifting guide slide grooves can also reduce the moving resistance of the lifting drive arm and ensure its smooth movement. Attached Figure Description

[0017] Figure 1 This is a schematic diagram illustrating the usage state of this utility model. Figure 2 for Figure 1 Enlarged diagram of point A in the middle. Figure 3 for Figure 1 Enlarged schematic diagram of this utility model at point B. Figure 4 for Figure 3 Top view of the structure of this utility model. Figure 5 for Figure 4 KK view in Figure 6 for Figure 3 Enlarged schematic diagram of the lifting guide slide.

[0018] Among them, 1 is a vacuum interrupter, 101 is a moving conductive rod, 102 is a conductive clamp, and 103 is a spring block; 2 is an insulating frame, 201 is an upper conductive plate, 202 is an upper insulating support column, 203 is a lower conductive plate, 204 is a lower insulating support column, and 205 is an insulating bracket; 3 is an insulating pull rod, 301 is a spring, 302 is a lower connecting rod, and 303 is an insulating limit block; 4 is an operating linkage mechanism, 401 is a main crank arm, 402 is a mounting shaft, 403 is a driven crank arm, 404 is an intermediate connecting rod, and 40... 5 is the intermediate crank arm, 406 is the lifting drive arm, 4061 is the lifting slide shaft, 4062 is the pulley, 4063 is the buffer pressure roller, 407 is the opening spring, 408 is the opening spring hanger, 4081 is the threaded connection part, 409 is the fixed shaft, 4091 is the adjusting bolt, 410 is the buffer, 411 is the first hinge shaft, 412 is the intermediate rotating shaft, 413 is the second hinge shaft, 414 is the lifting connecting rod, 415 is the mounting plate, 4151 is the lifting guide slide groove; 5 is the operating mechanism; 6 is the flexible connection. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] like Figures 1-6 As shown, this utility model includes a mounting housing, and the mounting housing is provided with a mounting shaft 402, an intermediate connecting rod 404, an intermediate crank arm 405, a lifting drive arm 406, and an operating mechanism 5. The mounting shaft 402 is provided with a main crank arm 401 and a driven crank arm 403. The main crank arm 401 is driven to rotate by the operating mechanism 5, thereby causing the mounting shaft 402 and the driven crank arm 403 to rotate together. The driven crank arm 403, the intermediate connecting rod 404, the intermediate crank arm 405, and the lifting drive arm 406 are sequentially hinged. Figures 3-5As shown, the first hinge shaft 411 between the intermediate connecting rod 404 and the intermediate crank arm 405 is connected to the fixed shaft 409 located in the mounting box via a brake spring 407. The mounting box contains a mounting plate 415 and a buffer 410. The upper end of the lifting drive arm 406 is provided with a lifting slide shaft 4061 that cooperates with the lifting guide slide groove on the mounting plate 415. The buffer 410 is located on the lower side of the lifting drive arm 406. In this embodiment, the buffer 410 is an oil buffer, which is a commercially available product. In addition, the operating mechanism 5 is a spring operating mechanism, which is a well-known technology in the art. For example, see the mechanism in patent CN202585163U.

[0021] like Figures 3-4 As shown, in this embodiment, the main crank arm 401 and the driven crank arm 403 are both mounted on a crank arm bushing, the crank arm bushing is mounted on the mounting shaft 402, and the crank arm bushing and the mounting shaft 402 are splined together.

[0022] like Figure 3 As shown, in this embodiment, one end of the intermediate connecting rod 404 is rotatably connected to the driven crank arm 403 via a crank arm hinge, and the other end is rotatably connected to one end of the intermediate crank arm 405 via a first hinge 411. The intermediate crank arm 405 rotates around the intermediate pivot 412 in the middle, and the other end of the intermediate crank arm 405 is rotatably connected to the lower end of the lifting drive arm 406 via a second hinge 413.

[0023] like Figures 3-4 As shown, in this embodiment, one end of the spring 407 is hooked to the first hinge shaft 411 via a first hook, and the other end is hooked to the spring 408 via a second hook. The spring 408 has a threaded connection part 4081 at the end away from the spring 407. The fixed shaft 409 has an adjusting bolt 4091, and the adjusting bolt 4091 is threadedly connected to the threaded connection part 4081. Tightening the adjusting bolt 4091 can precisely adjust the preload of the spring 407.

[0024] The tripping spring 407 is used to provide power for the tripping of the vacuum interrupter 1, such as... Figure 1 and Figure 3As shown, when the vacuum interrupter 1 is closed (i.e., the moving conductive rod 101 rises and contacts the stationary conductive rod), the opening spring 407 is in a stretched state. When the vacuum interrupter 1 is opened, the operating mechanism 5 does not function, the main crank arm 401 automatically resets, and the energy released by the opening spring 407 directly acts on the intermediate crank arm 405, which causes the intermediate crank arm 405 to rotate and drive the lifting drive arm 406 to descend, thereby pulling down the insulating rod 3 to separate the moving conductive rod 101 of the vacuum interrupter 1 from the stationary conductive rod. During the above process, since the energy released by the opening spring 407 acts directly on the intermediate crank arm 405, its energy is almost directly used for the downward action of the moving conductive rod 101 of the vacuum interrupter 1. This can provide a higher initial acceleration, thereby making the opening process of the vacuum interrupter 1 faster, which is beneficial to shorten the opening time. At the same time, it also reduces the load borne by the key connection at the mounting shaft 402, so that its function is mainly concentrated on the closing and position holding of the vacuum interrupter 1, thereby greatly improving the mechanical life and reliability of the entire operating mechanism.

[0025] like Figure 3 and Figure 6 As shown, in this embodiment, both ends of the lifting shaft 4061 are provided with pulleys 4062. The pulleys 4062 respectively cooperate with the lifting guide grooves 4151 on the corresponding side mounting plate 415. The above structure can ensure that the upper end of the lifting drive arm 406 can be lifted vertically, thereby ensuring that the insulating rod 3 is pulled vertically. At the same time, the cooperation between the pulleys 4062 and the lifting guide grooves 4151 can also reduce the moving resistance and ensure that the lifting drive arm 406 moves smoothly.

[0026] like Figure 3 and Figure 5 As shown, in this embodiment, the lifting slide shaft 4061 is provided with a lifting connecting rod 414, the lower end of the insulating pull rod 3 is provided with a lower connecting rod 302, and the lifting connecting rod 414 is fixedly connected to the lower connecting rod 302.

[0027] like Figure 5As shown, in this embodiment, the lower end of the lifting drive arm 406 is provided with a buffer pressure roller 4063. When the circuit is opened, the lifting drive arm 406 is driven to fall by the intermediate crank arm 405, and the buffer pressure roller 4063 contacts the buffer 410 for buffering. The buffer 410 can effectively absorb the remaining kinetic energy and impact force at the end of the opening through liquid damping, so as to ensure that the mechanism stops smoothly without bouncing, thereby protecting the entire operating mechanism and realizing the reliable opening of the vacuum interrupter 1. In addition, this utility model is different from the buffer design of the spline connection in the mounting shaft 402 in the prior art. This utility model directly applies the buffer 410 to the lifting drive arm 406 and the intermediate crank arm 405 during the movement process, aiming to optimize the mechanical characteristics from the process, rather than just solving the problem at the end of the mechanism. This can significantly reduce the mechanical stress of the entire operating mechanism, thereby improving the reliability and service life of the mechanism.

[0028] like Figure 1 As shown, in this embodiment, an insulating frame 2 is provided on the upper side of the mounting box, and the insulating tie rod 3 and the vacuum interrupter 1 are both located in the insulating frame 2. The insulating frame 2 includes an upper conductive plate 201 and a lower conductive plate 203. An upper insulating support column 202 and a vacuum interrupter 1 are provided between the upper conductive plate 201 and the lower conductive plate 203, and the vacuum interrupter 1 is located between each of the upper insulating support columns 202. A lower insulating support column 204 is provided between the lower conductive plate 203 and the mounting box. The vacuum interrupter 1 is equipped with an insulating pull rod 3, which is located between each of the lower insulating supports 204. The upper end of the static conductive rod of the vacuum interrupter 1 is electrically connected to the upper conductive plate 201, and the lower end of the moving conductive rod 101 of the vacuum interrupter 1 is connected to the insulating pull rod 3. The lower end of the moving conductive rod 101 is provided with a flexible connection 6 connected to the current transformer. In addition, an insulating bracket 205 is provided on one side of the lower conductive plate 203, and the flexible connection 6 extends from the insulating bracket 205 to the outside of the insulating frame 2. The vacuum interrupter 1 is a known technology in the art, for example, see patents such as CN204577322U. The assembly method of the insulating frame 2 adopted in this utility model is clear in its layers and orderly in its connection, which can meet the installation and opening and closing operation requirements of the vacuum interrupter 1 and the insulating pull rod 3, and also facilitates disassembly, maintenance and repair.

[0029] like Figure 2As shown, in this embodiment, the lower end of the movable conductive rod 101 is provided with a conductive clip 102, and one side of the conductive clip 102 is fixedly connected to the flexible connection 6. The lower end of the conductive clip 102 is connected to the spring pressure block 103 by bolts. The upper end of the insulating pull rod 3 is provided with a spring receiving cavity, and a spring 301 is provided in the spring receiving cavity. The spring pressure block 103 is located in the spring receiving cavity and abuts against the spring 301. The upper end of the spring receiving cavity is provided with an insulating limiting block 303 to prevent the spring pressure block 103 from disengaging. In this embodiment, the spring 301 is an overtravel spring, which can ensure that the vacuum interrupter 1 can be reliably closed. Specifically, when the insulating pull rod 3 drives the moving conductive rod 101 in the vacuum interrupter 1 to rise and contact the stationary conductive rod to close the circuit, after the moving conductive rod 101 rises and contacts the stationary conductive rod, the lifting drive arm 406 will continue to rise a certain distance, so that the spring pressure block 103 at the lower end of the moving conductive rod 101 moves relative to compress the spring 301, thereby applying a certain pressure to the spring 301 to ensure that the vacuum interrupter 1 is reliably closed.

[0030] The working principle of this utility model is as follows: like Figure 1 As shown, this utility model is mainly used for the opening and closing linkage of the operating mechanism 5 and the vacuum interrupter 1, thereby ensuring the reliability of the mechanism's operation and extending its service life. When this utility model is connected to an electrified railway traction power supply system, the upper conductive plate 201 at the upper end of the insulating frame 2 is electrically connected to the incoming line end, the flexible connection 6 is connected to the current transformer, and the current transformer is electrically connected to the outgoing line end. The incoming line end is used to connect to the traction winding of the main transformer in the traction substation, and the outgoing line end is connected to the contact network along the railway line via a power supply line. All of the above are technologies known in the art.

[0031] And such Figures 3-6 As shown, during the operation of this utility model, in the closing process of the operating mechanism 5 (spring operating mechanism, which is known in the art), the mounting shaft 402 acts as the core fulcrum. The energy released by the closing spring in the operating mechanism 5 drives the main crank arm 401 to rotate, thereby causing the driven crank arm 403, intermediate connecting rod 404, intermediate crank arm 405 and lifting drive arm 406 to move in sequence. The upper end of the lifting drive arm 406 will form a vertical upward linear motion, so that the insulating pull rod 3 rises to realize that the moving conductive rod 101 in the vacuum interrupter 1 rises and contacts the stationary conductive rod to close the circuit. At the same time, the opening spring 407 is stretched by the first hinge shaft 411 between the intermediate connecting rod 404 and the intermediate crank arm 405.

[0032] When the operating mechanism 5 is tripped, the operating mechanism 5 will not act on the main crank arm 401, and the main crank arm 401 will automatically reset. At this time, the tripping spring 407 pulls the first hinge shaft 411 to move, thereby driving the intermediate crank arm 405, the lifting drive arm 406 and the insulating pull rod 3 to move together. The insulating pull rod 3 is driven to descend by the lifting drive arm 406, so that the moving conductive rod 101 of the vacuum interrupter 1 descends and separates from the stationary conductive rod, thereby realizing the tripping operation of the vacuum interrupter 1.

Claims

1. A circuit breaker vacuum interrupter opening and closing linkage mechanism, characterized in that: The system includes a mounting housing, and the mounting housing contains a mounting shaft (402), an intermediate connecting rod (404), an intermediate crank arm (405), a lifting drive arm (406), and an operating mechanism (5). The mounting shaft (402) has a main crank arm (401) and a driven crank arm (403). The main crank arm (401) is driven to rotate by the operating mechanism (5). The driven crank arm (403), intermediate connecting rod (404), intermediate crank arm (405), and lifting drive arm (406) are sequentially hinged. The intermediate connecting rod (404) and... The first hinge shaft (411) between the intermediate crank arms (405) is connected to the fixed shaft (409) in the mounting box through the opening spring (407); the mounting box is provided with a mounting plate (415) and a buffer (410), and the upper end of the lifting drive arm (406) is provided with a lifting slide shaft (4061) that cooperates with the lifting guide slide groove (4151) on the mounting plate (415), and the buffer (410) is located on the lower side of the lifting drive arm (406); the lifting slide shaft (4061) is connected to the insulating pull rod (3).

2. The circuit breaker vacuum interrupter opening and closing linkage mechanism according to claim 1, characterized in that: One end of the intermediate connecting rod (404) is rotatably connected to the driven crank arm (403) via a crank arm hinge, and the other end is rotatably connected to one end of the intermediate crank arm (405) via a first hinge (411). The intermediate crank arm (405) rotates around the intermediate pivot (412) in the middle. The end of the intermediate crank arm (405) away from the first hinge (411) is rotatably connected to the lower end of the lifting drive arm (406) via a second hinge (413).

3. The circuit breaker vacuum interrupter opening and closing linkage mechanism according to claim 1, characterized in that: One end of the spring (407) is hooked to the first hinge shaft (411) via the first hook, and the other end is hooked to the spring hanger (408) via the second hook. The spring hanger (408) has a threaded connection part (4081) at the end away from the spring (407). The fixed shaft (409) has an adjusting bolt (4091), and the adjusting bolt (4091) is threadedly connected to the threaded connection part (4081).

4. The circuit breaker vacuum interrupter opening and closing linkage mechanism according to claim 1, characterized in that: Both ends of the lifting shaft (4061) are provided with pulleys (4062), and the pulleys (4062) respectively cooperate with the lifting guide grooves (4151) on the corresponding side mounting plate (415).

5. The circuit breaker vacuum interrupter opening and closing linkage mechanism according to claim 1, characterized in that: The lower end of the lifting drive arm (406) is provided with a buffer pressure roller (4063) that contacts the buffer (410).

6. The circuit breaker vacuum interrupter opening and closing linkage mechanism according to claim 1, characterized in that: The lifting slide shaft (4061) is provided with a lifting connecting rod (414), and the lower end of the insulating pull rod (3) is provided with a lower connecting rod (302), and the lifting connecting rod (414) is fixedly connected to the lower connecting rod (302).

7. The circuit breaker vacuum interrupter opening and closing linkage mechanism according to claim 1, characterized in that: An insulating frame (2) is provided on the upper side of the mounting box. An insulating tie rod (3) and a vacuum interrupter (1) are both located in the insulating frame (2). The insulating frame (2) includes an upper conductive plate (201) and a lower conductive plate (203). An upper insulating support column (202) and a vacuum interrupter (1) are provided between the upper conductive plate (201) and the lower conductive plate (203). A lower insulating support column (204) and an insulating tie rod (3) are provided between the lower conductive plate (203) and the mounting box. The upper end of the static conductive rod of the vacuum interrupter (1) is electrically connected to the upper conductive plate (201). The lower end of the moving conductive rod (101) of the vacuum interrupter (1) is connected to the insulating tie rod (3). The lower end of the moving conductive rod (101) is provided with a flexible connection (6) connected to a current transformer.

8. The circuit breaker vacuum interrupter opening and closing linkage mechanism according to claim 7, characterized in that: The lower end of the moving conductive rod (101) is provided with a conductive clamp (102), and one side of the conductive clamp (102) is fixedly connected to the flexible connection (6). The lower end of the conductive clamp (102) is connected to the spring pressure block (103) by bolts. The upper end of the insulating pull rod (3) is provided with a spring receiving cavity, and a spring (301) is provided in the spring receiving cavity. The spring pressure block (103) is located in the spring receiving cavity and abuts against the spring (301). The upper end of the spring receiving cavity is provided with an insulating limiting block (303) to prevent the spring pressure block (103) from detaching.

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