Arc extinguishing structure for contactor

Abstract

The utility model discloses an arc extinguishing structure for a contactor. The arc extinguishing structure comprises an arc extinguishing chamber structure, a main loop structure and a magnetic blow-out structure. According to the arc extinguishing principle, in the process that a main loop is disconnected, electric arcs are generated, lengthened and transferred to a lower arc striking strip from movable and static contact points, the lower arc striking strip is connected with a contact plate, a coil and a static contact, arc currents generate a magnetic field through the coil, and the magnetic field is bound between the contacts through an iron core and a magnetic conduction plate; and the arc is quickly transferred to the arc extinguish chamber under the action of the magnetic field to complete arc extinguish. The structure is simple, the static contact is connected with the lower arc strike strip by selecting the proper coil, and electric arc can be quickly transferred into the arc extinguishing chamber, so that arc extinguishing gas is easier to diffuse to the metal grid sheet for heat dissipation, and the service life of the contactor is prolonged.

Description

Technical Field

[0001] This utility model relates to a switching electrical device, and more particularly to an arc-extinguishing structure for a contactor. Background Technology

[0002] Contactors, an indispensable component in the electrical field, are widely used in power control and automation, especially in rail transit systems. They play a crucial role in distributing electrical energy, protecting circuits, and preventing overloads. Their reliability and durability make them essential electrical components in various industrial and commercial applications, laying a solid foundation for the smooth operation of rail transit.

[0003] Existing contactors suffer from problems such as complex structure, slow arc extinguishing speed, poor heat dissipation, and short service life.

[0004] In view of the above, this utility model is hereby proposed. Utility Model Content

[0005] The purpose of this utility model is to provide a solution to the aforementioned technical problems existing in the prior art.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] The arc-extinguishing structure for a contactor of this utility model includes an arc-extinguishing chamber structure, a main circuit structure, and a magnetic blowout structure.

[0008] The arc-extinguishing chamber structure includes an arc-extinguishing cover flange 8, a metal grid 11, a lower arc-guiding strip 10, and an upper arc-guiding strip 9;

[0009] The main circuit structure includes a moving contact 1 and a stationary contact 2;

[0010] The magnetic blowout structure includes a contact plate 7, a coil 4, a wire lug 6, an iron core 3, and a magnetic guide plate 5;

[0011] The lower arc bar 10 is connected to the stationary contact 2, and the upper arc bar 9 is connected to the moving contact 1.

[0012] Compared with the prior art, the arc extinguishing structure for contactors provided by this utility model has a simple structure. By selecting a suitable coil to connect the stationary contact to the lower arc-leading strip, the arc can be quickly transferred to the arc extinguishing chamber, making it easier for the arc-extinguishing gas to diffuse onto the metal grid for heat dissipation, thereby improving the service life of the contactor. Attached Figure Description

[0013] Figure 1 A front view of the contactor arc-extinguishing structure (in the closed state) provided in an embodiment of this utility model;

[0014] Figure 2 for Figure 1 The left view of the view;

[0015] Figure 3 for Figure 2 Sectional view along axis AA;

[0016] Figure 4 This is a view of the contactor in the off state (with a magnetic guide plate and arc-extinguishing flange hidden).

[0017] Explanation of reference numerals in the attached figures:

[0018] 1. Moving contact; 2. Stationary contact; 3. Iron core; 4. Coil; 5. Magnetic guide plate; 6. Wire lug; 7. Contact plate; 8. Arc extinguishing cover flange; 9. Upper arc guide bar; 10. Lower arc guide bar; 11. Metal grid. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments, which do not constitute a limitation on the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] First, the following explanations are provided for the terms that may be used in this article:

[0021] The term "and / or" means that either or both can be achieved simultaneously. For example, X and / or Y means that it includes both "X" or "Y" as well as the three cases of "X and Y".

[0022] The terms “including,” “comprising,” “containing,” “having,” or other similar semantic descriptions should be interpreted as non-exclusive inclusion. For example, “including a technical feature element (such as raw material, component, ingredient, carrier, dosage form, material, size, part, component, mechanism, device, step, process, method, reaction conditions, processing conditions, parameter, algorithm, signal, data, product or article of manufacture, etc.)” should be interpreted as including not only the expressly listed technical feature element, but also other technical feature elements that are not expressly listed and are well-known in the art.

[0023] The term "composed of" excludes any technical features not expressly listed. When used in a claim, it closes the claim to exclude all technical features other than those expressly listed, except for associated conventional impurities. If the term appears only in a clause of a claim, it limits the claim to the elements expressly listed in that clause; elements recited in other clauses are not excluded from the overall claim.

[0024] Unless otherwise explicitly specified or limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this document according to the specific circumstances.

[0025] The terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “back,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience and simplification of description and do not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this document.

[0026] The contents not described in detail in the embodiments of this utility model are existing technologies known to those skilled in the art. Where specific conditions are not specified in the embodiments of this utility model, they shall be performed according to conventional conditions in the art or conditions recommended by the manufacturer. Reagents or instruments used in the embodiments of this utility model whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0027] The arc-extinguishing structure for a contactor of the present invention includes an arc-extinguishing chamber structure, a main circuit structure, and a magnetic blowout structure;

[0028] The arc-extinguishing chamber structure includes an arc-extinguishing cover flange 8, a metal grid 11, a lower arc-guiding strip 10, and an upper arc-guiding strip 9;

[0029] The main circuit structure includes a moving contact 1 and a stationary contact 2;

[0030] The magnetic blowout structure includes a contact plate 7, a coil 4, a wire lug 6, an iron core 3, and a magnetic guide plate 5;

[0031] The lower arc bar 10 is connected to the stationary contact 2, and the upper arc bar 9 is connected to the moving contact 1.

[0032] In the main circuit structure, the contact surfaces of the moving contact 1 and the stationary contact 2 form an angle of 135° with the horizontal line.

[0033] In the magnetic blowout structure, the magnetic plate 5 is 3mm thick and is a rectangle with rounded corners. The rectangle is 50mm long, 20mm wide, and has a rounded corner radius of 3mm. The two long sides of the magnetic plate 5 are parallel to the contact surfaces of the moving contact 1 and the stationary contact 2.

[0034] In the arc-extinguishing chamber structure, the distance between the lower arc-leading strip 10 and the contact point of the stationary contact 2 is 3mm-4mm. The thickness of the lower arc-leading strip 10 and the upper arc-leading strip 9 is 2.5mm respectively. The contact plate 7 is pressed on the center of the lower arc-leading strip 10. The lower arc-leading strip 10 and the upper arc-leading strip 9 are stepped in shape, and the lower arc-leading strip 10 and the upper arc-leading strip 9 are perpendicular to each other.

[0035] In summary, the arc-extinguishing structure for contactors in this embodiment of the invention operates on the principle that during the main circuit disconnection process, an electric arc is generated at the contact point between the moving and stationary contacts, elongates, and transfers to the lower arc-leading strip. The lower arc-leading strip is connected to the contact plate, coil, and stationary contact. The arc current generates a magnetic field through the coil, and the iron core and magnetic plate confine the magnetic field between the contacts. Under the influence of the magnetic field, the arc rapidly transfers to the arc-extinguishing chamber, completing its extinction. This structure is simple. By selecting a suitable coil to connect the stationary contact to the lower arc-leading strip, the arc can be quickly transferred to the arc-extinguishing chamber, making it easier for the arc-extinguishing gas to diffuse onto the metal grid for heat dissipation, thereby improving the service life of the contactor.

[0036] To more clearly demonstrate the technical solution and its effects provided by the present invention, the embodiments of the present invention will be described in detail below with reference to specific examples.

[0037] An arc-extinguishing structure for a contactor includes an arc-extinguishing chamber structure, a main circuit structure, and a magnetic blowout structure;

[0038] The arc-extinguishing chamber structure includes an arc-extinguishing cover flange, metal grid plates, and arc-starting strips;

[0039] The main circuit structure includes a moving contact and a stationary contact;

[0040] The magnetic blowout structure includes a contact plate, a coil, a wire lug, an iron core, and a magnetic guide plate.

[0041] During the process of disconnecting the main circuit, an electric arc is generated at the contact point between the moving and stationary contacts. As the moving contact moves, the electric arc is elongated and transferred to the lower arc-leading bar. The lower arc-leading bar is connected to the contact plate, the coil, and the stationary contact. The arc current generates a magnetic field through the coil. The iron core and the magnetic plate bind the magnetic field between the contacts. Under the action of the magnetic field, the electric arc is quickly transferred to the arc-extinguishing chamber to extinguish the arc.

[0042] This invention has a simple structure, high reliability and durability, and can be used in both AC and DC operating conditions. Compared with similar structures, it has the advantage of fast arc extinguishing speed.

[0043] Example 1

[0044] like Figures 1 to 4 The figures shown are the front view and sectional view of the arc-extinguishing structure, respectively.

[0045] Under normal closing conditions, current is injected from the stationary contact, flows through the contact points of moving contact 1 and stationary contact 2, and exits from moving contact 1. When the contactor controls the disconnection, moving contact 1 moves upward, generating an arc between the two contacts. As moving contact 1 moves upward, the arc is lengthened. Since the lower arc strip 10 and stationary contact 2 are connected through coil 4, stationary contact 2 and lower arc strip 10 are equipotential bodies. The arc root can easily transfer from the contact point of stationary contact 2 to the lower arc strip 10. At this time, current flows through the inside of coil 4, generating a magnetic field. The iron core 3 binds the magnetic field, and the magnetic field is applied between the two contacts through the magnetic plate 5. Under the action of the magnetic field, the arc deflects, quickly detaches from the contact, and transfers to the lower arc strip 10, and then enters the arc-extinguishing chamber to be extinguished.

[0046] Preferably, the tail of the lower arc bar 10 is designed to be bent, and its thickness should not exceed 1.5mm. The closest distance between the tail and the contact point of the stationary contact 2 is controlled at 3mm-4mm, which facilitates the transfer of the arc root and avoids accidental contact.

[0047] Preferably, the surface of the contact plate 7 is cleaned and embedded in the contactor housing as an insert, maintaining good contact with the coil 4. The contact position between the contact plate and the lower arc strip 10 is located in the center of the lower arc strip 10 to avoid poor contact and other phenomena.

[0048] Preferably, the thickness of the magnetic plate 5 is selected as 3mm. If it is too thin, it cannot confine a sufficient magnetic field, resulting in slow arc transfer and reduced arc extinguishing capability. If the area of ​​the magnetic plate 5 is too large or the thickness is too thick, it will lead to excessive weight of the contactor, which is not conducive to weight reduction of the contactor. Adding rounded corners will facilitate the installation of the magnetic plate 5.

[0049] Preferably, the diameter of coil 4 is 2mm, and 26 turns of enameled wire are used for winding. If the number of turns is too few, the magnetic field generated will be too weak, and the arc will not be able to transfer quickly, resulting in arc extinguishing failure. If the number of turns is too many, the magnetic field generated will be too strong, and the arc will transfer too quickly, which will generate a large reverse voltage and pose a risk of secondary breakdown, resulting in arc extinguishing failure.

[0050] The above description is merely a preferred embodiment of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims. The information disclosed in the background section is intended only to enhance the understanding of the overall background technology of this utility model and should not be construed as an admission or implication in any way that such information constitutes prior art known to those skilled in the art.

Claims

1. An arc quenching structure for a contactor, characterized by, It comprises arc-extinguishing chamber structure, main circuit structure and magnetic blow structure. The arc-extinguishing chamber structure comprises arc-extinguishing cover flange (8), metal lattices (11), lower arc leading strip (10) and upper arc leading strip (9). The main circuit structure comprises moving contact (1) and static contact (2). The magnetic blow structure comprises contact plate (7), coil (4), wire nose (6), iron core (3) and magnetic conducting plate (5). The lower arc leading strip (10) is connected with the static contact (2), and the upper arc leading strip (9) is connected with the moving contact (1).

2. The arc extinguishing structure for a contactor according to claim 1, characterized by, In the main circuit structure, the contact surface of the moving contact (1) and the static contact (2) is 135° with the horizontal line.

3. The arc extinguishing structure for a contactor according to claim 2, characterized by, In the magnetic blow structure, the thickness of the magnetic conducting plate (5) is 3mm, the shape is rectangular with round corners, the length of the rectangle is 50mm, the width is 20mm, the round corner is 3mm, and the two long sides of the magnetic conducting plate (5) are parallel to the contact surface of the moving contact (1) and the static contact (2).

4. The arc extinguishing structure for a contactor according to claim 3, characterized by In the arc-extinguishing chamber structure, the distance between the lower arc leading strip (10) and the static contact (2) is 3mm-4mm; the thickness of the lower arc leading strip (10) and the upper arc leading strip (9) is 2.5mm respectively, the contact plate (7) is pressed in the center of the lower arc leading strip (10), the shape of the lower arc leading strip (10) and the upper arc leading strip (9) is step-shaped, and the lower arc leading strip (10) and the upper arc leading strip (9) are perpendicular to each other.

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