Bypass switch of quick single-phase bypass vacuum contactor

Abstract

The invention discloses a quick single-phase bypass vacuum contactor bypass switch, 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 invention, 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] The invention relates to the technical field of vacuum contactors, in particular to a fast single-phase bypass vacuum contactor bypass switch. Background Art

[0002] At present, in the power system, high, medium and low voltage contactors and circuit breakers all use electromagnetic opening and closing. The speed of electromagnetic opening and closing is mainly realized by the size of the coil and the magnet. Because the vacuum contact relies on the vacuum arc extinguishing chamber to extinguish the arc, the vacuum arc extinguishing chamber is composed of self-closing force and contact compression spring. The vacuum contactor used in conventional power has contact compression spring and opening reaction spring as the design idea. Therefore, the designed coil and magnet are relatively large in size to push the moving end of the vacuum arc extinguishing chamber to the closing position, because the pushing force must be greater than the sum of the self-closing force, overtravel spring force and reaction spring force of the vacuum arc extinguishing chamber. The larger the coil, the longer the closing time. Because the electromagnet coil has inductance, the size of the inductance is related to the speed of the contact closing time.

[0003] At present, conventional contactors in the domestic market can no longer meet the needs of new industries such as photovoltaic solar energy, wind power generation, energy storage, flexible DC transmission and distribution, and frequency conversion. Because these new types of power generation need to be converted from AC to DC or DC to AC when they are connected to the power grid or the power distribution and transmission method, the control method cannot be separated from the design idea of ​​applying IGBT electronic switch control. The design scheme using IGBT electronic switches cannot do without the bypass switch as an electrical component. Therefore, the bypass switch contactor is the key original component in the valve, so the requirements for the closing time and reliability of the contactor are extremely high, and due to reasons such as floor space and cost control, the product volume requirements are also very strict, which cannot be achieved by conventional contactors. Summary of the invention

[0004] In order to make up for the deficiencies of the prior art, the embodiments of the present application propose a fast single-phase bypass vacuum contactor bypass switch to solve the problems existing in the prior art.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] A fast single-phase bypass vacuum contactor bypass switch comprises a permanent magnet drive mechanism, a static end conductive copper bar, an insulating support column, a fixed plate, a vacuum arc extinguishing chamber, an insulator, a pressure regulating screw, a torque conversion crank arm and a hand-separated crank arm. The insulating support columns are provided with four, and the four insulating support columns, the fixed plate and the upper cover of the magnetic cylinder 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. The static end conductive copper bar and the vacuum arc extinguishing chamber are fixed together with the fixed plate by screws to form a power supply incoming line terminal. The insulator and the spring torque regulating screw link the lower end of the vacuum arc extinguishing chamber with the moving iron core of the magnetic cylinder through the torque conversion crank arm.

[0007] As a further technical solution of the present invention: a first conductive flexible row and a second conductive flexible row are arranged at the lower end of the vacuum arc extinguishing chamber to form a power input and output end.

[0008] As a further technical solution of the present invention: four contact springs are arranged under the second conductive flexible row to suppress the bouncing of the moving contact and the tilting caused by the electric repulsion force.

[0009] As a further technical solution of the present invention: 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 the present invention: the permanent magnet drive mechanism also includes a magnetic cylinder, which is composed of an upper end cover, a lower end cover and a cylinder body, and 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 under the upper end cover, and the bottom of the moving iron core and the end surface of the lower end cover are attracted by the permanent magnet to achieve the opening retention; one end of the torque conversion arm is connected to the moving iron core by tightening the transmission shaft, and the other end is connected to the insulator through a spring torque adjustment screw to form a lever mechanism, and the torque conversion arm is installed on the torque conversion arm mounting seat, which is fixed to the side of the magnetic cylinder, and the auxiliary spring is sleeved on the outside of the moving iron core, one end of which is connected to the upper end cover of the magnetic cylinder, and the other end It is connected to the moving iron core to provide auxiliary thrust when closing the circuit breaker and store energy when opening the circuit breaker. The contact spring is distributed under the second conductive soft row, and its two ends are respectively connected to the moving contact bracket and the lower end of the arc extinguishing chamber. The pressure is adjusted by the spring torque adjusting screw to inhibit abnormal movement of the contact. 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 manually pushed, the moving iron core is driven to move upward, and the moving contact and static contact of the vacuum arc extinguishing chamber are pulled apart to achieve manual opening of the circuit breaker. The first coil and the second coil are arranged in parallel on the outside of the magnetic cylinder. When power is turned on, a reverse magnetic circuit is generated to overcome the holding force of the permanent magnet and drive the moving iron core to close the circuit. After power is off, the self-closing force of the vacuum arc extinguishing chamber and the spring force keep the circuit breaker in the closed state.

[0011] As a further technical solution of the present invention: the torque conversion 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 to speed up the closing speed.

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

[0013] (1) Through the conversion of 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 magnetic cylinder, reduces the weight of the movable part and speeds up the closing speed.

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

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

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

[0017] (5) By applying reverse design thinking, the magnetic cylinder and the vacuum interrupter are connected in an offset manner and the universal joints are installed independently of each other, which avoids the lateral torque and friction coefficient caused by the tolerance of the accessories and reduces the bounce and pre-breakdown problems caused by the tilt of the vacuum interrupter contacts due to the coaxiality deviation. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] In the figure: 1-fixed plate, 2-static end conductive copper bar, 3-insulating support column, 4-vacuum interrupter, 5-first conductive soft bar, 6-fastening transmission shaft, 7-contact spring × 4, 8-second conductive soft bar, 9-torque conversion crank arm, 10-insulator, 11-torque conversion crank arm mounting seat, 12-spring torque adjustment screw, 13-auxiliary switch, 14-linkage crank arm, 15-magnetic ring, 16-hand-separated 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 DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

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

[0023] The static end conductive copper bar 2 and the vacuum interrupter 4 are fastened to the fixing plate 1 by screws to form a power supply inlet terminal, wherein the static contact of the vacuum interrupter 4 is electrically connected to the static end conductive copper bar 2 .

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

[0025] Four contact springs 7 are symmetrically arranged below the second conductive flexible row 8, one end of which is connected to the moving contact bracket and the other end is fixed to the lower end of the arc extinguishing chamber, so as 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 to the moving iron core 22 through the torque conversion arm 9 to transmit the opening and closing power and maintain insulation.

[0027] 3. The permanent magnet drive mechanism includes a magnetic cylinder, which is composed of an upper end cover 17, a lower end cover 24 and a cylinder body, and is internally installed with a permanent magnet 18, a moving iron core 22 and a first coil 20 and a second coil 21 of a double coil.

[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, and the bottom and the end surface of the lower end cover 24 are attracted by the permanent magnet to achieve the opening holding.

[0029] One end of the torque conversion arm 9 is connected to the moving iron core 22 through the fastening transmission shaft 6, and the other end is connected to the insulator 10 through the spring torque adjustment screw 12, forming a lever mechanism, amplifying the driving force of the magnetic cylinder and reducing the weight of the movable part.

[0030] The torque conversion crank arm 9 is installed on the torque conversion crank arm mounting seat 11, and the mounting seat 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 of which is connected to the upper end cover 17 of the magnetic cylinder, and the other end is connected to the moving iron core 22, and is used to provide auxiliary thrust when closing the switch and store energy when opening the switch.

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

[0033] The manual opening 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 opening crank arm 16 is manually pushed, the moving iron core 22 is driven to move upward, pulling apart the moving contact and the static contact of the vacuum interrupter to realize manual opening.

[0034] The first coil 20 and the second coil 21 are arranged in parallel on the outside of the magnetic cylinder and are redundant to each other. When power is turned on, a reverse magnetic circuit is generated to overcome the holding force of the permanent magnet and drive the moving iron core 22 to close the switch. After power is off, the self-closing force of the vacuum interrupter and the spring force keep the switch in the closed state.

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

[0036] The static end conductive copper busbar 2, the conductive flexible busbars 5, 8 and the frame structure are electrically isolated through the insulating support column 3 and the insulator 10, ensuring the insulation performance of each live component and the grounding frame.

[0037] Each component is connected in series through the logic of "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 realizes efficient power conversion through double coils and torque crank arms, the vacuum arc extinguishing chamber and contact spring system ensure the reliability of conductivity, and the manual opening mechanism provides redundant operation mode. The overall structure is compact and meets high reliability requirements.

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

[0039] In addition, it should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment have also been appropriately combined to form other implementation modes that are easy for those skilled in the art to understand.

Claims

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

2. A fast single-phase bypass vacuum contactor bypass switch according to claim 1, characterized in that: A first conductive flexible row (5) and a second conductive flexible row (8) are arranged at the lower end of the vacuum arc extinguishing chamber (4) to form a power input and output end.

3. A fast single-phase bypass vacuum contactor bypass switch according to claim 2, characterized in that: Four contact springs (7) are arranged below the second conductive flexible row (8) to suppress the bouncing of the moving contact and the tilting caused by the electromotive repulsive force.

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

5. A fast single-phase bypass vacuum contactor bypass switch according to claim 1, characterized in that: The permanent magnet drive mechanism also includes a magnetic cylinder, which is composed of an upper end cover (17), a lower end cover (24) and a cylinder body. A permanent magnet (18), a moving iron core (22), a first coil 20 and a second coil 21 are installed inside the cylinder body. The permanent magnet (18) is fixed below the upper end cover (17). The bottom of the moving iron core (22) and the end surface of the lower end cover (24) are attracted by the permanent magnet to achieve the opening and holding of the switch. One end of the torque conversion arm (9) is connected to the moving iron core (22) through a fastening transmission shaft (6), and the other end is connected to the insulator (10) through a spring torque adjustment screw (12) to form a lever mechanism. The torque conversion arm (9) is installed on a torque conversion arm mounting seat (11), which is fixed to the side of the magnetic cylinder. The auxiliary spring (23) is sleeved on the outer side of the moving iron core (22), and one end is connected to the upper end cover (17) of the magnetic cylinder. The other end is connected to the moving iron core (22) for providing auxiliary thrust when closing the switch and storing energy when opening the switch; the contact spring (7) is distributed below the second conductive soft row (8), and the two ends are respectively connected to the moving contact bracket and the lower end of the arc extinguishing chamber, and the pressure is adjusted by the spring torque adjustment screw (12) to inhibit abnormal movement of the contact; the manual opening 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 opening crank arm (16) is manually pushed, the moving iron core (22) is driven to move upward, and the moving contact and the static contact of the vacuum arc extinguishing chamber are pulled apart to realize manual opening; the first coil (20) and the second coil (21) are arranged in parallel on the outside of the magnetic cylinder, and when power is turned on, a reverse magnetic circuit is generated to overcome the holding force of the permanent magnet and drive the moving iron core (22) to close the switch. After power is turned off, the self-closing force of the vacuum arc extinguishing chamber and the spring force maintain the closed state.

6. A fast single-phase bypass vacuum contactor bypass switch according to claim 1, characterized in that: The torque conversion crank arm (9) is linked with the moving iron core (22) to amplify the effective holding force of the magnetic cylinder through the lever principle, thereby reducing the weight of the movable part and accelerating the closing speed.

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