A DC fast circuit breaker based on gas blow-out arc extinction

Abstract

The utility model relates to a direct current quick circuit breaker technical field, especially in a kind of based on air blast arc extinguishing's direct current quick circuit breaker device.The device aims at solving the problem that contact driving device and air valve device are set apart in prior art, leading to action out of sync, large space occupation and low reliability problem.Its core is that integrated linkage mechanism is arranged in shell: including fixed in the rotating shaft of shell, the first connecting rod rotationally connected with rotating shaft, the second connecting rod module and third connecting rod module are set in the lower end of first connecting rod;Air pipe and nozzle with valve are also fixed in shell, and with the second connecting rod module bottom end connection moving contact, corresponding static contact.The convex end face of valve hand wheel is abutted by third connecting rod module end.When the first connecting rod moves around rotating shaft, second connecting rod module can synchronously drive to control moving contact opening and closing, and open and close valve by third connecting rod module, realize the accurate synchronization and integrated drive of air flow arc extinguishing and contact operation.

Description

Technical Field

[0001] This utility model relates to the field of DC fast circuit breaker technology, and in particular to a DC fast circuit breaker device based on air blowing arc extinguishing. Background Technology

[0002] With the rapid development of high-voltage direct current transmission, new energy grid connection and industrial DC power distribution systems, DC fast circuit breakers, as core equipment to ensure the safe operation of the system, directly affect the reliability and stability of the power system. Unlike AC circuits, DC circuits do not have a natural zero crossing point. When a DC circuit breaker breaks the circuit, the electric arc generated between the contacts is difficult to extinguish on its own. The continuous arc can not only cause contact erosion and insulation aging, but may even cause serious faults such as short circuits. Therefore, efficient arc extinguishing technology has become the key to the research and development of DC circuit breakers. The arc extinguishing technology of traditional DC circuit breakers has many limitations. Electromagnetic DC circuit breakers are operated and driven by DC solenoid electromagnets, which have problems such as large operating current and long opening time. In addition, in order to meet performance requirements, the size of the electromagnet needs to be increased, resulting in a large circuit breaker that is difficult to adapt to frequent operation scenarios. Although air-type DC circuit breakers have advantages such as large breaking current and low cost, the arc energy is low when breaking small currents, making it difficult to push the arc to the arc extinguishing chamber, causing the arc to remain between the contacts and not be effectively extinguished. To address the aforementioned issues, air-blowing arc extinguishing technology has been gradually applied to DC circuit breakers. This technology uses high-speed airflow to blow away the arc, removing its heat and dispersing charged particles, thus accelerating the deionization process and achieving rapid arc extinguishing.

[0003] The aforementioned existing technical solutions have the following drawbacks: the separate design of the contact drive device and the valve leads to asynchronous operation of the contact drive device and the valve device and a reduction in reliability. Utility Model Content

[0004] The purpose of this invention is to provide a DC fast circuit breaker based on air blowing arc extinguishing, so as to solve the problems existing in the prior art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a DC fast circuit breaker based on air blowing arc extinguishing, comprising a housing and a first connecting rod, characterized in that: the housing is hollow inside, a mounting hole is provided at the top right side of the housing, the mounting hole communicates with the interior of the housing, a rotating shaft is provided in the mounting hole, the axis of the rotating shaft is in the front-back direction, a circular hole adapted to the rotating shaft is provided at the right end of the first connecting rod, and the rotating shaft is rotatably connected to the first connecting rod; The bottom end of the first link located inside the housing is provided with a second link module and a third link module spaced apart front and back; The bottom of the outer casing is provided with an air pipe fixedly installed on the rear inner wall. A valve is provided on the air pipe. The valve consists of a valve body and a handwheel. The outlet of the valve is connected to one end of a nozzle, and the other end of the nozzle faces to the right. The handwheel's axis is in the front-to-back direction, and a forward-facing protrusion is provided at the bottom front side of the handwheel, with the top surface of the protrusion being a plane. The left end of the first connecting rod is provided with a clearance hole that runs vertically through it. The top end of the second connecting rod module is movably installed in the clearance hole. The second connecting rod module is provided with an extension located at the top end of the first connecting rod, and a limiting plate is sleeved on the extension. The third link module is located behind the second link module, and the bottom end of the third link module is pressed against the top surface of the protrusion. A connecting rod is fixedly installed at the bottom left end of the second linkage module, and a moving contact is fixedly installed at the bottom of the connecting rod. A stationary contact that cooperates with the moving contact is fixedly installed inside the housing.

[0006] By adopting the above technical solution, the second linkage module is movably installed in the clearance hole of the first linkage. The second linkage module is connected to the top surface of the handwheel protrusion through the third linkage module, so that the contact drive device and the air valve are integrally formed, avoiding asynchronous operation and enhancing the reliability of the device.

[0007] In a further embodiment, the lower end of the second link module is provided with a waist-shaped groove, which penetrates the second link module.

[0008] By adopting the above technical solution, the displacement of the handwheel is limited.

[0009] In a further embodiment, the third link module includes a second link, a third link, a coil spring, and a mounting block. The mounting block is fixedly connected to the rear end of the second link module. One end of the second link is hinged to the mounting block, and one end of the third link is hinged to the mounting block. The coil spring is fixedly connected to the mounting block. The end faces of the second link and the third link are spherical structures. The other end of the third link is in contact with the side of the second link, and the other end of the second link is pressed against the top surface of the protrusion.

[0010] By adopting the above technical solution, when the first link drives the second link module to run, the valve is driven by the third link module, forming an integral structure.

[0011] In a further embodiment, the housing is provided with a waterproof membrane, which is disposed at the location of the mounting hole.

[0012] By adopting the above technical solution, external water is prevented from entering the device through the installation hole, thus preventing the device from affecting its operation or damaging it.

[0013] In a further embodiment, an insulating bracket is provided at the inner bottom of the housing, and the stationary contact is fixedly mounted on the insulating bracket.

[0014] By adopting the above technical solution, the insulating bracket isolates the stationary contact from the housing, preventing surface discharge or short circuit faults during operation.

[0015] In summary, this utility model has the following beneficial effects: 1. The design of the first link, second link module, and third link module can connect the contact drive device and the valve together to form an integrated structure, which solves the problems of asynchronous operation of the contact drive device and valve, large space occupation, and low reliability. The waterproof membrane design can prevent water from entering the device through the mounting hole, affecting the operation of the device or damaging the device. The insulating bracket design at the bottom of the shell can prevent surface discharge or short circuit faults during operation. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this novel practical invention; Figure 2 This is a schematic diagram of the first connecting rod, the second connecting part, the third connecting part, and the valve structure of this utility model; Figure 3 This is a schematic diagram of the outer shell structure of this utility model.

[0017] In the diagram, 1. Outer shell; 2. First connecting rod; 3. Rotating shaft; 4. Second connecting rod module; 5. Limiting plate; 6. Third connecting rod module; 61. Second connecting rod; 62. Third connecting rod; 63. Coil spring; 64. Mounting block; 7. Connecting rod; 8. Moving contact; 9. Stationary contact; 10. Insulating bracket; 11. Valve; 111. Valve body; 112. Handwheel; 12. Extension. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to the accompanying drawings.

[0019] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0020] Example 1: like Figure 1 As shown, a DC fast circuit breaker based on air blowing arc extinguishing includes a housing. A mounting hole is provided at the top right side of the housing, and a rotating shaft is provided in the mounting hole. A circular hole adapted to the rotating shaft is provided at the right end of the first connecting rod. A second connecting rod module and a third connecting rod module are provided at intervals at the bottom rear end of the first connecting rod. A valve is connected to the second connecting rod module through the third connecting rod module.

[0021] like Figure 2 As shown, the second linkage module has an extension at the top of the linkage, and a limiting plate is fitted on the extension. The third linkage module consists of the second linkage, the third linkage, a coil spring, and a mounting block. The third linkage module is located behind the second linkage module. The valve consists of a valve body and a handwheel. The front bottom of the handwheel has a forward-facing protrusion with a flat top surface. The bottom of the third linkage module abuts against the top surface of the protrusion. like Figure 3 As shown, an insulating bracket is provided at the inner bottom of the housing, and the stationary contact is fixedly installed on the upper end of the insulating bracket.

[0022] Specific implementation process: A mounting hole is provided at the top right side of the outer casing 1, communicating with the interior of the outer casing 1. A rotating shaft 3 is installed inside the mounting hole. A circular hole adapted to the rotating shaft 3 is provided at the right end of the first connecting rod 2. A second connecting rod module 4 and a third connecting rod module 6 are arranged at intervals at the bottom of the first connecting rod 2. An air pipe is fixedly installed on the rear inner wall at the bottom interior of the outer casing 1. A valve 11 is installed on the air pipe, comprising a valve body 111 and a handwheel 112. The outlet of the valve 11 is connected to one end of a nozzle. A forward-facing protrusion is provided at the bottom front side of the handwheel, with the top surface of the protrusion being flat. The third connecting rod module 6 is located behind the second connecting rod module 4. The bottom end of block 6 is pressed against the top surface of the protrusion. A connecting rod is fixedly installed at the bottom of the second linkage module 4, and a moving contact is fixedly installed at the bottom of the connecting rod. A stationary contact that works with the moving contact is fixedly installed inside the outer casing 1. When the first linkage 2 is pressed during air blow arc extinguishing, the second linkage module 4 moves upward, the coil spring 64 begins to store energy, the moving contact 8 follows the upward movement of the second linkage module 4 and completes separation from the stationary contact 9. During the upward movement of the second linkage module 4, the valve 11 completes the opening of the valve and completes the arc extinguishing through the transmission connection of the third linkage module 6. When moving downward to close, the coil spring 64 releases energy to drive the valve 11 downward. The waist-shaped groove at the lower end of the second linkage module 4 restricts the displacement of the handwheel 112 and completes the valve closure.

[0023] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0024] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A DC fast circuit breaker based on air-blown arc extinguishing, comprising a housing (1) and a first connecting rod (2), characterized in that: The outer shell (1) is hollow inside. The top right side of the outer shell (1) is provided with a mounting hole. The mounting hole is connected to the interior of the outer shell (1). A rotating shaft (3) is provided in the mounting hole. The axis of the rotating shaft (3) is in the front-back direction. The right end of the first connecting rod (2) is provided with a round hole that matches the rotating shaft (3). The rotating shaft (3) is rotatably connected to the first connecting rod (2). The bottom of the first link (2) located inside the outer shell (1) is provided with a second link module (4) and a third link module (6) spaced back and forth. The inner bottom of the outer shell (1) is provided with an air pipe fixedly installed on the rear inner wall. A valve (11) is provided on the air pipe. The valve (11) consists of a valve body (111) and a handwheel (112). The outlet of the valve (11) is connected to one end of a nozzle, and the other end of the nozzle faces to the right. The axis of the handwheel (112) is in the front-back direction, and the front bottom end of the handwheel (112) is provided with a forward protrusion, the top surface of the protrusion is a plane; The left end of the first connecting rod (2) is provided with a clearance hole that runs through the top and bottom. The top end of the second connecting rod module (4) is movably installed in the clearance hole. The second connecting rod module (4) is provided with an extension (12) located at the top end of the first connecting rod (2). A limiting plate (5) is sleeved on the extension (12). The third link module (6) is located behind the second link module (4), and the bottom end of the third link module (6) is pressed against the top surface of the protrusion; A connecting rod (7) is fixedly installed at the bottom left end of the second connecting rod module (4), and a moving contact (8) is fixedly installed at the bottom of the connecting rod (7). A stationary contact (9) that works in conjunction with the moving contact (8) is fixedly installed inside the outer shell (1).

2. A DC fast circuit breaker based on air-blown arc extinguishing as described in claim 1, characterized in that: The lower end of the second link module (4) is provided with a waist-shaped groove, which penetrates the second link module (4).

3. A DC fast circuit breaker based on air-blown arc extinguishing as described in claim 1, characterized in that: The third link module (6) includes a second link (61), a third link (62), a coil spring (63), and a mounting block (64). The mounting block (64) is fixedly connected to the rear end of the second link module (4). One end of the second link (61) is hinged to the mounting block (64). One end of the third link (62) is hinged to the mounting block (64). The coil spring (63) is fixedly connected to the mounting block (64). The end faces of the first link (2) and the second link (61) are spherical structures. The other end of the third link is in contact with the side of the second link (61). The other end of the second link (61) is pressed against the top surface of the protrusion.

4. A DC fast circuit breaker based on air-blown arc extinguishing as described in claim 1, characterized in that: The outer casing (1) is provided with a waterproof membrane inside, and the waterproof membrane is located at the mounting hole.

5. A DC fast circuit breaker based on air-blown arc extinguishing according to claim 1, characterized in that: An insulating bracket (10) is provided at the inner bottom of the outer casing (1), and the stationary contact (9) is fixedly installed on the insulating bracket (10).

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