Contactor arc extinguish chamber design with arc-shaped grid sheet structure

Abstract

The invention relates to a contactor arc extinguish chamber design with an arc-shaped grid sheet structure. The arc extinguishing structure comprises a group of arc-shaped grid sheets arranged in the arc extinguishing chamber and used for lengthening an arc path when an arc is generated and gradually decomposing and cooling the arc through the segmentation effect of the grid sheets so as to accelerate the extinguishing of the arc. The grid sheets are arranged in an arc shape, can effectively guide the arc to expand along the arc direction, prevents the arc from being concentrated at a single point, and reduces the local energy density of the arc. In addition, the arc design can be matched with the magnetic blow-out effect of the permanent magnet, the moving distance of the arc is further increased, and the arc extinguishing efficiency is improved. The arc-shaped grid sheet structure is suitable for high-voltage and large-current direct-current contactors and has the advantages of being simple in structure, good in arc extinguishing effect and high in durability.

Description

Technical Field

[0001] The invention relates to the field of electric power equipment, and in particular to an arc extinguishing grid structure for a DC contactor, which can effectively extinguish arcs under high current and high voltage conditions. Background Art

[0002] With the continuous expansion of DC application scenarios, the arc extinguishing technology of DC contactors is particularly important. During the arc extinguishing process, the existing DC contactors may fail to extinguish the arc in time due to the lack of effective magnetic field control and structural design, thus affecting the performance and safety of the switch.

[0003] Traditional arc extinguishing methods mostly rely on flat grids or magnetic blowing, but these structures have problems such as insufficient arc elongation, long arc extinguishing time, and unsatisfactory arc extinguishing effect when the arc is extinguished, especially in high current and high voltage environments. Therefore, optimizing the design of the grid to improve the arc extinguishing efficiency has become a necessary improvement direction. Summary of the invention

[0004] The object of the present invention is to provide an arc extinguishing chamber structure of a DC contactor with a constant magnetic field and an arc-shaped grid structure, so as to solve the problems of insufficient arc extinguishing effect and reliability of the existing contactor.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: a contactor arc extinguishing chamber design with an arc-shaped grid structure includes a shell, a permanent magnet, a moving contact assembly, a static contact assembly, a reset spring, an arc-shaped grid, an iron core and a yoke.

[0006] The housing is used to accommodate and protect internal components, and permanent magnets are arranged on both sides of the housing to provide a constant magnetic field. The static contact on the top of the housing is provided with a wiring hole, which is used to connect an external circuit and is equipped with a wiring gasket to ensure the stability of the connection.

[0007] The moving contact assembly is arranged inside the housing, and comprises a moving contact, a spring, a moving contact bracket and a connecting rod. The moving contact cooperates with the stationary contact assembly to realize the on-off of the circuit.

[0008] The side of the moving contact bracket is provided with a mounting hole for fixing and connecting the moving contact. With the action of the connecting rod, the moving contact assembly can switch between the rotary, direct-acting and rotary-down motion modes to achieve different breaking modes.

[0009] The arc-shaped grid is arranged inside the housing and has a multi-layer structure, which is used to disperse the arc and accelerate the cooling of the arc to form an effective arc extinguishing area. The arc is dispersed and cooled under the action of the grid, thereby accelerating the arc extinguishing process and improving the arc extinguishing efficiency.

[0010] The iron core and the yoke are respectively arranged at the lower part of the shell and the periphery of the permanent magnet, and the yoke is used to enhance the magnetic field strength and focusing effect generated by the permanent magnet. The iron core further enhances the guiding ability of the magnetic field and ensures the stability of arc dissipation.

[0011] As a preferred solution for the design of a contactor arc extinguishing chamber with an arc-shaped grid structure, a guide structure is provided at the edge of the contact surface between the moving contact and the stationary contact assembly to enhance the guiding effect of arc extinguishing; at the same time, the arc-shaped grid is made of an alloy material that is resistant to high temperature and arc impact, and the grid has excellent thermal stability and resistance to arc erosion, and can work stably for a long time.

[0012] As a preferred solution for the design of a contactor arc extinguishing chamber with an arc-shaped grid structure, the arc-shaped grids are symmetrically distributed on both sides of the moving contact assembly. The arc is guided to the grid area under the action of the constant magnetic field provided by the permanent magnet, which significantly improves the arc extinguishing effect and reduces the arc loss to the moving contact and the static contact assembly.

[0013] As a preferred solution for the arc extinguishing chamber design of the contactor with an arc-shaped grid structure, the arc-shaped grids are symmetrically arranged at the four corners of the housing to achieve a non-polar current breaking function. This design ensures that the arc can be effectively guided to the grid area under current conditions of different polarities, thereby enhancing the arc extinguishing effect and improving the applicability and reliability of the contactor.

[0014] As a preferred solution for the arc extinguishing chamber design of the contactor with an arc-shaped grid structure, the grid adopts an arc-shaped structure, which increases the running path of the arc on the grid. Through the arc-shaped design, the arc is forced to extend along the arc curve, which greatly increases the arc path and effectively improves the arc dispersion ability.

[0015] As a preferred solution for the design of a contactor arc extinguishing chamber with an arc-shaped grid structure, the arc-shaped grid is designed with a curve so that the heat is evenly dispersed along the arc path, avoiding the problem of overheating caused by the arc being concentrated in one area, and effectively improving the life of the grid and the arc extinguishing effect.

[0016] As a preferred solution for the arc extinguishing chamber design of the contactor with an arc-shaped grid structure, multiple grids are arranged at intervals to form a multi-layer arc extinguishing area. After being elongated and divided, the arc needs to cross multiple grids to further disperse the arc energy and increase the arc extinguishing effect.

[0017] As a preferred solution for the design of the arc extinguishing chamber of the contactor with an arc-shaped grid structure, a spring is provided on the periphery of the connecting rod body for assisting resetting, and the lower part of the spring is located in the spring matching groove at the center of the iron core.

[0018] The present invention comprises a housing, a permanent magnet, a moving contact assembly, a stationary contact assembly, a spring, an arc-shaped grid sheet, an iron core and a magnetic yoke. The moving contact assembly is connected by a connecting rod and is acted upon by a reset spring and a body spring, so that the moving contact assembly can realize a variety of breaking modes such as rotation, direct motion and rotational descent. The wiring hole is located on the surface of the stationary contact at the top of the housing, which is used for connecting an external line and is provided with a wiring gasket to ensure stable connection. The housing is used to accommodate and protect the internal structure, and the four corners of the housing are symmetrically provided with arc-shaped grid sheets to achieve a non-polar breaking effect of direct current. The permanent magnets on both sides provide a constant magnetic field, and the arc is guided into the grid sheet area through the magnetic field, so that the arc is quickly cooled and extinguished, thereby improving the arc extinguishing effect, enhancing the arc extinguishing performance and extending the life of the contactor. The iron core and the magnetic yoke are used to enhance the focusing effect of the magnetic field. The present invention improves the arc extinguishing ability and reliability of the contactor by arranging arc-shaped grid sheets at the four corners, and guides the arc to disperse, elongate and quickly extinguish in combination with the constant magnetic field, and significantly extends the service life of the contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation modes of the present invention or the technical solutions in the prior art, the drawings required for use in the description of the implementation modes or the prior art are briefly introduced below.

[0020] The specific details of the structure, proportion, size, etc. shown in this specification are not limited in detail, and the design of the present invention is only shown through relevant illustrations. The focus is on the structural design of the arc extinguishing chamber and the shape of the arc-shaped grid. These illustrations are intended to help people familiar with the technical field understand the design ideas of this invention, and are not used as limiting conditions during implementation. Any adjustment or improvement in the arc extinguishing chamber structure or the shape of the grid, as long as it does not affect the arc extinguishing effect and technical realization goals of the present invention, should be deemed to be included in the scope of the technical content disclosed by the present invention.

[0021] Figure 1 A three-dimensional view of a contactor arc extinguishing chamber design with an arc-shaped grid structure provided by the present invention illustrates the arrangement of permanent magnets, arc-shaped grids and moving contacts.

[0022] Figure 2 A schematic diagram of a moving contact assembly designed for a contactor arc extinguishing chamber with an arc-shaped grid structure provided by the present invention;

[0023] Figure 3 A schematic diagram of an iron core designed for a contactor arc extinguishing chamber with an arc-shaped grid structure provided by the present invention;

[0024] Figure 4 A schematic diagram of a stationary contact assembly designed for a contactor arc extinguishing chamber with an arc-shaped grid structure provided by the present invention;

[0025] Figure 5A schematic structural diagram of an arc-shaped grid designed for a contactor arc extinguishing chamber with an arc-shaped grid structure provided by the present invention shows the arrangement of multiple arc-shaped grids and the path of arc elongation.

[0026] In the figure, 1. shell; 2. permanent magnet; 3. moving contact assembly; 4. stationary contact assembly; 5. reset spring; 6. arc-shaped grid; 7. iron core; 8. moving contact; 9. spring; 10. connecting rod; 11. moving contact bracket; 12. wiring hole; 13. wiring gasket; 14. moving contact; 15. yoke. DETAILED DESCRIPTION

[0027] To make the above-mentioned purpose, features and advantages of the present invention clearer and easier to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. Many specific details are provided in the following description to facilitate a full understanding of the principles and constructions of the present invention. However, the present invention is not limited to the specific embodiments described, and can be implemented in a variety of ways. Those skilled in the art can make similar improvements and deformations thereto without departing from the spirit and scope of the present invention, so the present invention is not limited to the specific embodiments disclosed below.

[0028] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The present invention provides a contactor arc extinguishing chamber design with an arc-shaped grid structure, including a housing 1, a permanent magnet 2, a moving contact assembly 3, a stationary contact assembly 4, a reset spring 5, an arc-shaped grid 6, an iron core 7 and a yoke 15;

[0029] The housing 1 is used to provide structural support and protection for the arc extinguishing chamber to prevent the influence of the external environment;

[0030] The permanent magnets 2 are installed on the left and right sides of the arc extinguishing chamber to provide a constant magnetic field for guiding the arc;

[0031] The moving contact assembly 3 and the stationary contact assembly 4 play a breaking role in the circuit; the upper surface of the stationary contact is provided with a wiring hole 12 and a wiring gasket 13 for electrical connection; the moving contact 8 is provided with a raised moving contact point 14 and a guide structure is provided on the edge of the contact surface to guide the generation and dissipation of the arc; the spring 9 is used to provide power during breaking and push the moving contact to separate; the connecting rod 10 is used to connect the moving contact and the bracket to ensure the movement trajectory of the moving contact during breaking; the moving contact bracket 11 is used to support the moving contact and cooperate with the connecting rod to realize various movement modes;

[0032] The return spring 5 is used to ensure that the moving contact assembly returns to the initial position after disconnection;

[0033] The arc grid 6 is provided with a multi-layer structure and is placed at the four corners of the housing to extend the path, cut the arc and disperse the arc heat;

[0034] The iron core 7 is used to enhance the magnetic field guiding effect and concentrate the arc. At the same time, the magnetic conductivity of the iron core 7 ensures that the arc always moves on the grid path, thereby improving the speed and stability of arc extinguishing.

[0035] The magnetic yoke 15 is used to concentrate the magnetic field of the permanent magnet, increase the magnetic field strength and focusing effect, so that the arc moves quickly under the action of the magnetic field and expands along a preset path;

[0036] When the contactor is disconnected, the moving contact 8 moves under the action of the spring 9, separates from the static contact, and generates an arc. In this process, the moving contact 8 can perform a variety of movement modes through the cooperation of the moving contact bracket 11 and the connecting rod 10. Rotational type: The moving contact 8 rotates around the moving connecting rod 10, so that the arc extends with the rotation of the moving contact, increasing the arc path; Direct-acting type: The moving contact 8 moves in a straight line along the connecting rod 10, so that the arc is rapidly elongated in a straight line; Rotational descending type: When the moving contact 8 is separated, it rotates and descends along the connecting rod 10, further extending the arc path and improving the arc extinguishing effect;

[0037] As the moving contact 8 moves further, the arc burns more violently and the arc column is continuously lengthened. Under the action of the constant magnetic field provided by the permanent magnet 2 and the yoke 15, the arc extends along the surface of the arc-shaped grid 6. Due to the arc-shaped design of the grid, the arc is forced to move along the arc-shaped path of the grid, further extending the actual path of the arc;

[0038] When the arc extends along the path of the grid, each layer of the arc grid 6 divides the arc into multiple small segments, so that the arc is gradually broken within multiple grid intervals, reducing the energy density of the arc. The multiple arc segments are evenly distributed in the multi-layer structure of the arc grid. With the high thermal conductivity of the grid, the heat of the arc is conducted to the housing 1, and the temperature of the short arc is quickly reduced to extinguish, while avoiding local overheating.

[0039] As the arc path increases and the energy density decreases, the temperature and current of the arc gradually decay until it is completely extinguished. The iron core 7 further guides the concentration of the magnetic field, making the arc more stable during the dissipation process, ensuring the reliability of the arc extinguishing effect.

[0040] The working principle of the present invention is to guide the arc to the grid during the breaking process through the constant magnetic field provided by the permanent magnet and the multi-layer arc grid structure, and to divide and lengthen the arc multiple times under the guidance of the magnetic field until the arc is completely extinguished. The multi-layer design of the arc grid ensures the effective dispersion of the arc energy, while reducing the risk of local overheating, thereby improving the safety and durability of the arc extinguishing chamber.

[0041] The entire process can be completed in a very short time, ensuring the effective extinguishing of the arc under high voltage and high current working conditions, reducing the damage and wear of the equipment caused by the arc.

Claims

1. A contactor arc extinguishing chamber design with an arc-shaped grid structure, characterized in that: It comprises a housing (1), a permanent magnet (2), a moving contact assembly (3), a stationary contact assembly (4), a reset spring (5), an arc-shaped grid sheet (6), and an iron core (7); The housing (1) is provided with a moving contact assembly (3), a stationary contact assembly (4) and an arc-shaped grid sheet (6), and permanent magnets (2) are installed on the left and right sides of the housing (1) for providing a constant magnetic field to enhance the dispersion and cooling effect of the electric arc; The moving contact assembly (3) comprises a moving contact (8), a spring (9), a connecting rod (10) and a moving contact bracket (11); the moving contact (8) is connected to the connecting rod (10) via the moving contact bracket (11) and cooperates with the spring (9) to achieve breaking; the moving contact bracket (11) and the connecting rod (10) can control the moving contact (8) to perform rotating, direct-acting, and rotating-down breaking of the arc to meet different breaking requirements; The arc-shaped grid pieces (6) are installed inside the housing (1), and the arc-shaped grid pieces (6) are in a stacked structure and are arranged along the moving direction of the moving contact assembly (3), and are used to stretch and disperse the arc during the breaking process, thereby improving the arc extinguishing efficiency; The static contact assembly (4) is fixedly mounted on the upper end of the housing (1) and is arranged correspondingly to the moving contact assembly (3) to achieve on-off control of the circuit.

2. The design of a contactor arc extinguishing chamber with an arc-shaped grid structure according to claim 1, characterized in that: The stationary contact assembly (4) is symmetrically designed on the top of the housing (1), and each stationary contact assembly (4) is provided with a wiring hole (12) and a wiring gasket (13) at the top, and an external circuit can be fixed in a slot of the wiring hole (12) by bolts; the edge of the moving contact (8) is symmetrically provided with moving contacts (14), and the moving contacts (14) are in contact with or disconnected from the bottom of the stationary contact assembly (4) to realize circuit switching.

3. The design of a contactor arc extinguishing chamber with an arc-shaped grid structure according to claim 2, characterized in that: The arc-shaped grid pieces (6) are located outside the moving contact (8), and the arc-shaped grid pieces (6) are distributed on both sides of the moving contact support (11) along the moving direction of the moving contact assembly (3) to disperse and cool the electric arc.

4. The design of a contactor arc extinguishing chamber with an arc-shaped grid structure according to claim 1, characterized in that: An iron core (7) is arranged at the bottom of the housing (1), and the lower end of the moving contact bracket (11) is inserted into the iron core (7) to provide support for breaking and resetting.

5. The design of a contactor arc extinguishing chamber with an arc-shaped grid structure according to claim 4, characterized in that: A spring (9) is provided inside the moving contact support (11), and the lower part of the spring (9) is located in the spring matching groove at the center of the iron core, and cooperates with the reset spring (5) in the iron core (7) to push the moving contact assembly (3) to reset after the disconnection is completed.

6. The design of a contactor arc extinguishing chamber with an arc-shaped grid structure according to claim 1, characterized in that: A semi-enclosed magnetic yoke (15) is provided on the outer side of the shell (1) for enhancing the magnetic field strength and focusing effect generated by the permanent magnet, and the bottom opening of the magnetic yoke (15) is used for accommodating an iron core.

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