Quick single-phase bypass vacuum contactor

Abstract

The utility model discloses a rapid single-phase bypass vacuum contactor, which comprises a permanent magnet driving mechanism, a static end conductive copper bar, four insulating support columns, a fixed plate, a vacuum arc-extinguishing chamber, an insulator, a pressure adjusting screw rod, a torque conversion crank arm and a manual switching crank arm, the four insulating support columns, the fixed plate and the magnetic cylinder upper cover form a fixed frame, the fixed plate above the frame is provided with a static end conductive copper bar and a vacuum arc-extinguishing chamber, and the opening maintenance is a design thought scheme adopting permanent magnet maintenance. Closing holding is performed through the self-closing force of the vacuum arc-extinguishing chamber and the force of the four contact springs and the auxiliary springs. According to the utility model, a manual mode is adopted for opening, and during opening, the manual opening mechanism is manually pushed towards the opening indication direction.

Description

Technical Field

[0001] This utility model relates to the field of vacuum contactor technology, and in particular to a fast single-phase bypass vacuum contactor. Background Technology

[0002] Currently, high, medium, and low voltage contactors and circuit breakers in power systems all use electromagnetic opening and closing mechanisms. The speed of electromagnetic opening and closing depends primarily on the size of the coil and magnet. Since vacuum contact relies on a vacuum interrupter for arc extinguishing, and the vacuum interrupter consists of a self-closing force and a contact spring, conventional vacuum contactors used in power systems are designed with contact springs and a tripping reaction spring in mind. Therefore, the coil and magnet are relatively large to push the moving end of the vacuum interrupter to the closed position, as the pushing force must be greater than the sum of the vacuum interrupter's self-closing force, overtravel spring force, and reaction spring force. A larger coil results in a longer closing time because the electromagnet coil has inductance, and the magnitude of this inductance affects the speed of contact closing.

[0003] New power generation methods, when connected to the power grid or distributed through transmission, all require AC to DC or DC to AC conversion. The control methods in these processes invariably rely on the application of IGBT electronic switches. Design schemes using IGBT electronic switches inevitably include bypass switches as electrical components. Therefore, the bypass switch contactor is a critical component in the valve, requiring extremely high standards for closing time and reliability. Furthermore, due to space constraints and cost control, the product size is also subject to strict requirements, making conventional contactors unsuitable. Utility Model Content

[0004] In order to overcome the shortcomings of the prior art, this application proposes a fast single-phase bypass vacuum contactor to solve the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0006] A fast single-phase bypass vacuum contactor includes a permanent magnet drive mechanism, a stationary conductive copper busbar, insulating support columns, a fixed plate, a vacuum interrupter, an insulator, a pressure regulating screw, a torque conversion crank arm, and a manual release crank arm. Four insulating support columns are provided, forming a fixed frame with the fixed plate and the upper end cover of the magnetic cylinder. The fixed plate above the frame houses the stationary conductive copper busbar and the vacuum interrupter. The stationary conductive copper busbar and the vacuum interrupter are fixed to the fixed plate with screws to form the power input terminal. The insulator and the spring torque regulating screw, through the torque conversion crank arm, cause the lower end of the vacuum interrupter to be linked with the moving iron core of the magnetic cylinder.

[0007] As a further technical solution of this utility model: the lower end of the vacuum interrupter is provided with a first conductive busbar and a second conductive busbar to form a power input and output terminal.

[0008] As a further technical solution of this utility model: four contact springs are provided below the second conductive flexible busbar to suppress the bouncing of the moving contact and the tilting caused by the electric repulsion force.

[0009] As a further technical solution of this utility model: the permanent magnet drive mechanism is a dual-coil drive, including a first coil and a second coil, and the two sets of coils are redundant to each other.

[0010] As a further technical solution of this utility model: the permanent magnet drive mechanism also includes a magnetic cylinder, which consists of an upper end cover, a lower end cover, and a cylinder body. A permanent magnet, a moving iron core, a first coil 20, and a second coil 21 are installed inside the cylinder body. The permanent magnet is fixed below the upper end cover, and the bottom of the moving iron core is attracted to the end face of the lower end cover by the permanent magnet to achieve the opening and holding effect. One end of the torque conversion crank arm is connected to the moving iron core via a fastening drive shaft, and the other end is connected to an insulator via a spring torque adjusting screw, forming a lever mechanism. The torque conversion crank arm is installed on a torque conversion crank arm mounting seat, which is fixed to the side of the magnetic cylinder. An auxiliary spring is sleeved on the outside of the moving iron core, with one end connected to the upper end cover of the magnetic cylinder and the other end connected to the upper end cover of the magnetic cylinder. The first end is connected to the moving iron core, which provides auxiliary thrust when closing and stores energy when opening. The contact springs are distributed below the second conductive flexible busbar, with both ends connected to the moving contact bracket and the lower end of the arc-extinguishing chamber, respectively. The pressure is adjusted by the spring torque adjusting screw to suppress abnormal contact movement. The manual opening crank arm is installed on the side of the magnetic cylinder and is connected to the moving iron core through the linkage crank arm. When the manual opening crank arm is pushed manually, it drives the moving iron core to move upward, opening the moving contact and stationary contact of the vacuum arc-extinguishing chamber, thus realizing manual opening. The first coil and the second coil are connected in parallel and sleeved on the outside of the magnetic cylinder. When energized, they generate a reverse magnetic circuit, which overcomes the holding force of the permanent magnet and drives the moving iron core to close. After de-energization, the vacuum arc-extinguishing chamber's self-closing force and the spring force maintain the closed state.

[0011] As a further technical solution of this utility model: the torque conversion crank arm is linked with the moving iron core, and the effective holding force of the magnetic cylinder is amplified through the lever principle, thereby reducing the weight of the movable part and speeding up the closing speed.

[0012] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0013] (1) By converting the torque crank arm, the crank arm lever mechanism amplifies the effective holding force of the magnetic cylinder under the same volume state of the permanent magnet cylinder, reduces the weight of the movable part, and speeds up the closing speed.

[0014] (2) The closing time can be adjusted by the auxiliary spring force and the contact spring torque.

[0015] (3) The single magnetic cylinder double coil drive mechanism mode increases the reliability of the bypass switch.

[0016] (4) By adding four contact springs, the contact pressure is increased several times and evenly distributed, which effectively suppresses all problems caused by contact bounce, electric repulsion and impact vibration during rapid closing.

[0017] (5) By using reverse design thinking, the magnetic cylinder and the vacuum interrupter are connected in a staggered manner and installed with independent universal joints, which avoids the lateral torque and friction coefficient caused by the tolerance of the accessories, and reduces the bouncing and pre-breakdown problems caused by the tilting of the vacuum interrupter contacts due to coaxiality deviation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a fast single-phase bypass vacuum contactor.

[0019] In the diagram: 1-Fixed plate, 2-Stationary conductive copper busbar, 3-Insulating support column, 4-Vacuum interrupter, 5-First conductive flexible busbar, 6-Fastening drive shaft, 7-Contact spring × 4, 8-Second conductive flexible busbar, 9-Torque conversion crank arm, 10-Insulator, 11-Torque conversion crank arm mounting base, 12-Spring torque adjusting screw, 13-Auxiliary switch, 14-Linkage crank arm, 15-Magnetic ring, 16-Manual crank arm, 17-Upper end cover, 18-Permanent magnet, 19-Iron core shaft, 20-First coil, 21-Second coil, 22-Moving iron core, 23-Auxiliary spring, 24-Lower end cover. Detailed Implementation

[0020] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0021] like Figure 1 As shown, a fast single-phase bypass vacuum contactor includes a permanent magnet drive mechanism, a stationary conductive copper busbar 2, an insulating support column 3, a fixing plate 1, a vacuum interrupter 4, an insulator 10, a pressure regulating screw 12, a torque conversion crank arm 9, and a manual release crank arm 16.

[0022] Four insulating support columns 3 are vertically distributed, with their upper ends fixedly connected to the fixed plate 1 and their lower ends fixedly connected to the upper cover 17 of the magnetic cylinder, together forming the fixed frame of the contactor to support the overall structure.

[0023] The stationary conductive copper busbar 2 and the vacuum interrupter 4 are fastened to the fixing plate 1 by screws to form the power input terminal, wherein the stationary contact of the vacuum interrupter 4 is electrically connected to the stationary conductive copper busbar 2.

[0024] The lower moving end of the vacuum interrupter 4 is connected to the power input end and the output end through the first conductive flexible busbar 5 and the second conductive flexible busbar 8 respectively, so as to realize the conductive function of the moving contact.

[0025] Four contact springs 7 are symmetrically arranged below the second conductive flexible busbar 8. One end is connected to the moving contact bracket, and the other end is fixed to the lower end of the arc-extinguishing chamber. They are used to suppress the bouncing of the moving contact and the tilting caused by the electric repulsion force.

[0026] One end of the insulator 10 is connected to the moving contact of the vacuum interrupter 4, and the other end is linked with the moving iron core 22 through the torque conversion crank arm 9 to transmit the opening and closing power and maintain insulation.

[0027] III. The permanent magnet drive mechanism includes a magnetic cylinder, which consists of an upper end cover 17, a lower end cover 24 and a cylinder body. The cylinder is internally equipped with a permanent magnet 18, a moving iron core 22 and a double coil first coil 20 and a second coil 21.

[0028] The permanent magnet 18 is fixed below the upper end cover 17 of the magnetic cylinder to provide the opening holding force; the moving iron core 22 is located inside the magnetic cylinder and can move up and down. Its bottom is attracted to the end face of the lower end cover 24 by the permanent magnet to achieve the opening holding.

[0029] One end of the torque conversion crank arm 9 is connected to the moving iron core 22 via the fastening drive shaft 6, and the other end is connected to the insulator 10 via the spring torque adjusting screw 12, forming a lever mechanism to amplify the driving force of the magnetic cylinder and reduce the weight of the movable part.

[0030] The torque conversion crank arm 9 is mounted on the torque conversion crank arm mounting base 11, which is fixed to the side of the magnetic cylinder to ensure the stability of the crank arm rotation.

[0031] The auxiliary spring 23 is sleeved on the outside of the moving iron core 22. One end is connected to the upper end cover 17 of the magnetic cylinder, and the other end is connected to the moving iron core 22. It is used to provide auxiliary thrust when closing and to store energy when opening.

[0032] The contact spring 7 is located below the second conductive flexible busbar 8, with its two ends connected to the moving contact bracket and the lower end of the arc-extinguishing chamber, respectively. The pressure is adjusted by the spring torque adjusting screw 12 to suppress abnormal contact movement.

[0033] The manual tripping crank arm 16 is installed on the side of the magnetic cylinder and is connected to the moving iron core 22 through the linkage crank arm 14. When the manual tripping crank arm 16 is pushed manually, it drives the moving iron core 22 to move upward, opening the moving contact and stationary contact of the vacuum interrupter, thus realizing manual tripping.

[0034] The first coil 20 and the second coil 21 are connected in parallel and sleeved on the outside of the magnetic cylinder, which are redundant to each other. When energized, they generate a reverse magnetic circuit, which overcomes the holding force of the permanent magnet and drives the moving iron core 22 to close. After de-energization, the closed state is maintained by the self-closing force of the vacuum interrupter and the spring force.

[0035] The magnetic cylinder and the vacuum interrupter 4 are connected by an insulator 10 and a torque conversion crank arm 9 in a staggered manner. The two are linked by an independent universal joint structure to avoid lateral torque and friction caused by coaxiality deviation, and reduce contact tilting and pre-breakdown problems.

[0036] The stationary conductive copper busbar 2, conductive flexible busbar 5, 8 and the frame structure are electrically isolated by the insulating support column 3 and the insulator 10 to ensure the insulation performance of each live component and the grounding frame.

[0037] The various components are connected in a logical series through "frame support → conductive connection → power transmission → opening and closing control" to form a complete fast single-phase bypass vacuum contactor system. Among them, the permanent magnet drive mechanism achieves efficient power conversion through dual coils and torque cranks, the vacuum interrupter and contact spring system ensures conductive reliability, and the manual opening mechanism provides redundant operation modes. The overall structure is compact and meets high reliability requirements.

[0038] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0039] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment have been appropriately combined to form other embodiments that are easy for those skilled in the art to understand.

Claims

1. A fast single-phase bypass vacuum contactor, comprising a permanent magnet drive mechanism, a stationary conductive copper busbar (2), an insulating support column (3), a fixing plate (1), a vacuum interrupter (4), an insulator (10), a spring torque adjusting screw (12), a torque conversion crank arm (9), and a manual release crank arm (16), characterized in that: The insulating support column (3) is provided in four sections. The four insulating support columns (3), together with the fixing plate (1) and the upper end cover (17) of the magnetic cylinder, form a fixed frame. The fixing plate (1) above the frame is provided with a stationary conductive copper busbar (2) and a vacuum interrupter (4). The stationary conductive copper busbar (2) and the vacuum interrupter (4) are fixed together with the fixing plate (1) by screws to form the power input terminal. The insulator (10) and the spring torque adjusting screw (12) are connected to the lower end of the vacuum interrupter (4) and the moving iron core (22) of the magnetic cylinder through the torque conversion crank arm (9).

2. The fast single-phase bypass vacuum contactor according to claim 1, characterized in that, The lower end of the vacuum interrupter (4) is provided with a first conductive soft busbar (5) and a second conductive soft busbar (8) to form a power input and output terminal.

3. A fast single-phase bypass vacuum contactor according to claim 2, characterized in that, Four contact springs (7) are provided below the second conductive soft board (8) to suppress the bouncing of the moving contact and the tilting caused by the electric repulsion force.

4. A fast single-phase bypass vacuum contactor according to claim 1, characterized in that, The permanent magnet drive mechanism is a dual-coil drive, including a first coil (20) and a second coil (21), with the two sets of coils being redundant.

5. A fast single-phase bypass vacuum contactor according to claim 1, characterized in that, The permanent magnet drive mechanism also includes a magnetic cylinder, which consists of an upper end cover (17), a lower end cover (24) and a cylinder body. The cylinder body is equipped with a permanent magnet (18), a moving iron core (22), a first coil (20) and a second coil (21).

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