Alternating current and direct current dual-purpose bridge type arc blowing device for contactor

Abstract

The utility model discloses an AC-DC dual-purpose bridge type arc blowing device for a contactor. The AC-DC dual-purpose bridge type arc blowing device comprises an arc blowing coil structure, an arc extinguishing grid assembly, a main contact assembly, a polarity plate and a contact plate. The arc blowing coil structure comprises a coil, a wire nose, an iron core and the like. The arc chute assembly comprises a positioning plate, a model plate, an arc striking strip and a pressing sheet; the main contact assembly comprises a static contact and a moving contact. According to the principle, in the breaking process of a main contact of the contactor, an electric arc is firstly generated between a contact point of a moving contact and a contact point of a static contact, the electric arc moves upwards along with the moving contact, and the electric arc is transferred along with movement of the moving contact; at the moment, the moving path of the current is static contact-wire nose-coil-contact plate-lower arc strike strip, a magnetic field generated when the current passes through the coil is bound by a magnetic conductive plate and an iron core and is applied between arcs, and the arcs are transferred to an arc extinguish chamber to be extinguished through the acting force of the magnetic field.

Description

Technical Field

[0001] The utility model relates to a switching electrical device, in particular to a bridge type arc blowing device for AC / DC dual-purpose contactors. Background Technique

[0002] In the rail transit system, as a protection switch for the locomotive vehicle traction system, load, and low-voltage control system, how the contactor can operate stably and whether it can complete breaking under extreme working conditions are important assessment factors. The breaking capacity requires the contactor to have the ability to break the current under both rated and extreme working conditions. Otherwise, irreversible losses will be caused to the locomotive traction system, load, or low-voltage control system.

[0003] Currently, different models of contactors need to be installed under many DC and AC working conditions. The contactors have poor versatility, cannot be compatible with the arc extinguishing performance of the contactors, and have poor installation speed and recognition.

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

[0005] The purpose of the present utility model is to provide a bridge type arc blowing device for AC / DC dual-purpose contactors to solve the above technical problems existing in the prior art.

[0006] The purpose of the present utility model is achieved through the following technical solutions:

[0007] The bridge type arc blowing device for AC / DC dual-purpose contactors of the present utility model includes two arc extinguishing grid assemblies 1, two arc blowing coil structures 4, and a main contactor assembly, which are connected by a polarity plate 5 and a connecting plate 6 to form a bridge circuit structure;

[0008] The arc blowing coil structure includes a coil 12, a wire nose 11, and an iron core 13;

[0009] The arc extinguishing grid assembly includes a positioning plate 10, a template 9, an arc ignition strip 8, and a pressing piece 7;

[0010] The main contactor assembly includes a static contact 3 and a moving contact 2. There are 2 static contacts 3 that are symmetrically arranged left and right. The moving contact 2 moves downward and finally contacts the static contact 3 to realize the connection of the main circuit.

[0011] Compared with the prior art, the bridge type arc blowing device for AC / DC dual-purpose contactors provided by the present utility model unifies the contactors under AC and DC working conditions. Whether the working condition is AC or DC, the same type of contactor can be selected, which is compatible with the arc extinguishing performance of the contactor and improves the installation speed and recognition. There is still a certain room for optimization in the assembly process and component processing of this utility model. Description of the Drawings

[0012] Figure 1a and Figure 1b and Figure 1c are the isometric schematic view, side schematic view, and schematic view in the A-A direction of the bridge-type arc-blowing device for AC / DC dual-use contactors provided by the embodiments of the present invention.

[0013] Figure 2 is the structural schematic view of the arc extinguishing grid assembly in the embodiments of the present invention.

[0014] Figure 3 is the structural schematic view of the arc-blowing coil in the embodiments of the present invention.

[0015] Figure 4 is the structural schematic view of the polar plate in the embodiments of the present invention.

[0016] Figure 5 is the structural schematic view of the moving contact in the embodiments of the present invention.

[0017] Figure 6 is the structural schematic view of the static contact in the embodiments of the present invention.

[0018] Figure 7 is the structural schematic view of the connecting plate in the embodiments of the present invention.

[0019] Explanation of reference numerals:

[0020] 1. Arc extinguishing grid assembly; 2. Moving contact; 3. Static contact; 4. Arc-blowing coil structure; 5. Polar plate; 6. Connecting plate; 7. Pressure plate; 8. Arc ignition strip; 9. Model plate; 10. Positioning plate; 11. Line nose; 12. Coil; 13. Iron core. Detailed implementation manners

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments, which do not constitute a limitation to the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] First, the following explanations will be given to the terms that may be used in this article:

[0023] The term "and / or" means that either one or both of the two can be achieved. For example, X and / or Y means that it includes both the case of "X" or "Y" and the three cases of "X and Y".

[0024] Descriptions using terms such as "comprising", "including", "containing", "having" or other similar semantics shall be construed as non-exclusive inclusion. For example, including a technical feature element (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, processes, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or articles, etc.) shall be construed as not only including the explicitly listed technical feature element, but also including other technical feature elements well-known in the art that are not explicitly listed.

[0025] The term "consisting of" means excluding any technical feature element not explicitly listed. If this term is used in a claim, it will make the claim a closed type, so that it does not include technical feature elements other than the explicitly listed ones, except for related conventional impurities. If this term only appears in a sub-clause of a claim, then it only limits the elements explicitly listed in that sub-clause, and the elements recorded in other sub-clauses are not excluded from the overall claim.

[0026] Unless otherwise clearly specified or limited, terms such as "installed", "connected", "joined", "fixed", etc. shall be understood in a broad sense. For example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0027] The content not described in detail in the embodiments of the present utility model belongs to the prior art well-known to those of ordinary skill in the art. For those conditions not specified in the embodiments of the present utility model, they shall be carried out according to the conventional conditions in the art or the conditions recommended by the manufacturer. For the reagents or instruments used in the embodiments of the present utility model without indicating the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0028] The bridge-type arc-blowing device for AC / DC dual-use contactors of the present utility model includes two arc extinguishing grid assemblies 1, two arc-blowing coil structures 4 and a main contactor assembly, and is connected by a polarity plate 5 and a connecting plate 6 to form a bridge-type circuit structure;

[0029] The arc-blowing coil structure includes a coil 12, a wire nose 11, and an iron core 13;

[0030] The arc extinguishing grid assembly includes a positioning plate 10, a template 9, an arcing strip 8, and a pressing piece 7;

[0031] The main contactor assembly includes a static contact 3 and a moving contact 2. There are 2 static contacts 3 that are symmetrically arranged left and right. The moving contact 2 moves downward and finally contacts the static contact 3 to realize the connection of the main circuit.

[0032] There are two wire lugs 11 in total, which are symmetrically arranged on the left and right sides. One is in contact with the static contact 3, and the other is in contact with the connecting plate 6.

[0033] The iron core 13 has a diameter of 6.2 mm and is arranged at the center inside the coil 12, with a clearance of 1.7 mm from the inner diameter of the coil 12.

[0034] The coil 12 has 26 turns and is welded to the wire lug 11 by brazing or resistance welding.

[0035] The pressure plate 7 is connected to the arc ignition strip 8 by bolts and needs to always be in contact with the moving contact.

[0036] When the moving contact 2 contacts the two static contacts 3, it is a double contact, and the two arc blowing coil structures 4 respectively point to the two contacts.

[0037] The polar plate 5 forms an angle of 45° with the horizontal direction.

[0038] In summary, the bridge-type arc blowing device for AC / DC dual-purpose contactors in the embodiment of the present invention can be used in AC working conditions and DC working conditions, and has obvious advantages such as simple structure, strong reliability, and fast response speed. It is modularly designed, easy to install, and conducive to the unified management of product quality.

[0039] The principle of the present invention is as follows:

[0040] During the process of the main contacts of the contactor being disconnected, an arc is first generated between the contacts of the moving contact and the static contact. As the moving contact moves upward, the arc will move with the movement of the moving contact. When the arc transfers from the static contact to the lower arc ignition strip, the current movement path at this time is static contact - wire lug - coil - contact plate - lower arc ignition strip. The magnetic field generated when the coil passes through the current is constrained by the magnetic conductive plate and the iron core and is applied between the arcs. The arc is transferred to the arc extinguishing chamber and extinguished by the acting force of the magnetic field.

[0041] In order to more clearly show the technical solutions provided by the present invention and the technical effects produced, the following will describe in detail the embodiments provided by the present invention with specific embodiments.

[0042] Embodiment 1

[0043] As Figure 1a 、 Figure 1b 、 Figure 1c shown, it is the overall structural configuration diagram of the assembly of the arc blowing coil mechanism, the contact, and the arc extinguishing grid assembly; Figures 2 to 7 It is a schematic diagram of each component.

[0044] There are 2 static contacts 3 in total, which are symmetrically arranged left and right. The moving contact 2 moves downward and finally contacts the static contact 3 to realize the connection of the main circuit;

[0045] There are two wire terminals 11 welded to the arc-blowing coil structure 4. One is in contact with the static contact 3, and the other is in contact with the connecting plate 6, and they are symmetric on the left and right sides.

[0046] The pressing piece 7 in the arc extinguishing grid assembly 1 is in constant contact with the moving contact 2, and there is a sliding friction contact relationship during the up and down movement of the moving contact 2.

[0047] Among all the components of the whole device, only the moving contact 2 has relative displacement, and the rest of the components are relatively fixed.

[0048] Its working principle is that an arc appears between the moving contact and the static contact during disconnection or bouncing. At this time, a loop is formed among the arc-blowing coil structure 4, the moving contact 2, the static contact 3, and the arc extinguishing grid assembly 1. At the same time, a magnetic field is generated in this energized loop by the coil, and the magnetic field is evenly distributed between the moving contacts through the polar plate 5. As the distance between the moving contact 2 and the static contact 3 increases, under the action of the magnetic field, the arc passes through the moving contact 2, the pressing piece 7, and the arc ignition strip 8 on the upper side, and passes through the static contact 3 and the arc ignition strip 8 on the lower side and enters the closely arranged template 8. Since the template 9 is made of metal and there are gaps between them, the arc is stretched and divided into multiple short arcs, thus extinguishing the arc.

[0049] Preferably, this structure is the contact arc extinguishing device of a bridge-type double-break contactor, so the left and right structures are symmetric.

[0050] Preferably, the coil is made of brass, and an insulating material is applied or covered on the outside. It is brazed to the wire terminal 11. It is necessary to ensure that one end of the wire terminal is in contact with the lower side of the static contact 3, and the other end is in contact with the connecting plate 6.

[0051] Preferably, the pressing piece 7 and the arc ignition strip 8 are fixed with M3 screws, and the pressing piece 7 and the moving contact 3 should always be in contact, whether the moving contact is in the closed position or the open position.

[0052] Preferably, as Figure 1a 、 Figure 1b 、 Figure 1c shown, both ends of the iron core are M5*10 counterbores, and the polar plate 7 is connected to the iron core 13 with M5 bolts.

[0053] As mentioned above, it is only the preferred specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims. The information disclosed in the background art part of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or imply in any form that this information constitutes the prior art known to those skilled in the art.

Claims

1. A bridge-type arc-blowing device for AC / DC dual-use contactors, characterized in that, It includes two arc extinguishing grid components (1), two arc blowing coil structures (4) and a main contact component, which are connected by a polarity plate (5) and a connecting plate (6) to form a bridge circuit structure; The arc blowing coil structure (4) includes a coil (12), a wire nose (11) and an iron core (13); The arc extinguishing grid component (1) includes a positioning plate (10), a template (9), an arcing strip (8) and a pressing piece (7); The main contact component includes a static contact (3) and a moving contact (2). There are 2 static contacts (3) symmetrically arranged on the left and right. The moving contact (2) moves downward and finally contacts the static contact (3) to realize the connection of the main circuit.

2. The bridge-type arc-blowing device for AC / DC dual-use contactors according to claim 1, characterized in that There are two wire noses (11) symmetrically arranged on the left and right sides. One contacts the static contact (3), and the other contacts the connecting plate (6).

3. The bridge-type arc-blowing device for AC / DC dual-use contactors according to claim 2, wherein The diameter of the iron core (13) is 6.2 mm, which is arranged at the center position inside the coil (12), and the clearance with the inner diameter of the coil (12) is 1.7 mm; The number of turns of the coil (12) is 26, and it is welded to the wire nose (11) by brazing or resistance welding.

4. The bridge-type arc-blowing device for AC / DC dual-use contactors according to claim 3, characterized in that, The pressing piece (7) is connected to the arcing strip (8) by bolts and always keeps sliding contact with the moving contact (2).

5. The bridge-type arc-blowing device for AC / DC dual-use contactors according to claim 4, characterized in that, When the moving contact (2) contacts the two static contacts (3), it is a double contact, and the two arc blowing coil structures (4) respectively point to the two contacts.

6. The bridge-type arc-blowing device for AC / DC dual-use contactors according to any one of claims 1 to 5, characterized in that, The included angle between the polarity plate (5) and the horizontal direction is 45°.

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