Moving contact structure of direct current contactor

Abstract

A moving contact structure of a direct current contactor comprises a push rod and a supporting piece, and the upper end of the push rod penetrates through the supporting piece and is fixedly provided with a limiting ring; a limiting disc is arranged in the middle of the outer surface of the push rod; a spring sleeves between the upper part of the limiting disc and the lower part of the supporting piece; the supporting piece comprises a connecting part, a left contact part and a right contact part, the left contact part and the right contact part are connected to the left side and the right side of the connecting part respectively, the left contact part and the right contact part are arranged in a V shape and extend obliquely upwards, and the connecting part, the left contact part and the right contact part are of an integrated structure. The upper surfaces of the left contact part and the right contact part are respectively provided with an anti-fusion welding part. According to the utility model, the defects in the prior art are overcome, and the left contact part and the right contact part are respectively arranged in a V-shaped manner and extend towards the inclined upper part, so that the whole supporting piece is supported upwards in a V-shaped manner, the bending resistance, shearing resistance, torsion resistance and deformation resistance of the supporting piece can be effectively enhanced, and the overall stability of the whole supporting piece is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of DC contactors, in particular to a moving contact structure of a DC contactor. Background Art

[0002] A DC contactor is a device that uses the current flowing through the coil to generate a magnetic field, close the contacts, and achieve effective power transmission. Commonly used contactors are generally composed of an electromagnetic system, a contact system, an arc extinguishing system, a transmission mechanism, and a housing. The electromagnetic system generally includes components such as a coil, a moving iron core, a static iron core, and a magnetic yoke. When the electromagnetic coil of the contactor is energized, a strong magnetic field is generated, causing the static iron core to generate an electromagnetic attraction to attract the moving iron core, and drive the contacts to move and close; when the coil is de-energized, the electromagnetic attraction disappears, the moving iron core is released under the action of the release spring, the contacts are restored, and the contacts are disconnected.

[0003] The moving contacts of current DC contactors are usually of flat-plate structure. However, since the moving contact and the static contact have a certain circuit electric repulsion when disconnecting, and since the contact will discharge and generate arcs in the process from connection to disconnection, the moving contact is prone to downward bending deformation due to the high arc energy and circuit electric repulsion during long-term use. Utility Model Content

[0004] In view of the deficiencies of the prior art, the utility model provides a moving contact structure of a DC contactor, which overcomes the deficiencies of the prior art and has a reasonable design. The left contact part and the right contact part are respectively extended obliquely upward in a V-shape, so that the entire support member is supported upward in a V-shape, thereby effectively enhancing its bending, shear, torsion and deformation resistance, thereby ensuring the overall stability of the entire support member.

[0005] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0006] A moving contact structure of a DC contactor comprises a push rod and a support member, wherein the lower end of the push rod is connected to the moving iron core of the DC contactor, and the upper end of the push rod passes through the support member and is fixedly mounted with a limit ring; a limit plate is arranged in the middle of the outer surface of the push rod, and a spring is sleeved between the upper part of the limit plate and the lower part of the support member;

[0007] The support member includes a connecting portion, a left contact portion and a right contact portion, wherein the left contact portion and the right contact portion are respectively connected to the left and right sides of the connecting portion, and the left contact portion and the right contact portion are respectively extended obliquely upward in a V-shape, and the connecting portion, the left contact portion and the right contact portion are an integrated structure, and the upper surfaces of the left contact portion and the right contact portion are both provided with anti-fusion welding portions.

[0008] Preferably, a through hole is provided in the middle of the connecting part, a step groove is provided above the through hole, an insulating gasket is installed in the through hole, the insulating gasket is sleeved on the outer surface of the push rod, the upper end of the push rod passes through the through hole and is provided with a limiting groove, the limiting ring is installed in the limiting groove, and the limiting ring is located in the step groove above the through hole.

[0009] Preferably, a magnetizing block is installed on the upper surface of the connecting portion.

[0010] Preferably, the outer cover of the magnetizing block is provided with a U-shaped ferrule, a bayonet is provided on the side of the U-shaped ferrule, a buckle is provided on the side of the connecting portion, and the U-shaped ferrule is fixed by the bayonet and the buckle.

[0011] Preferably, the anti-fusion welding portion is a welding silver point.

[0012] The utility model provides a moving contact structure of a DC contactor. It has the following beneficial effects: by extending the left contact part and the right contact part obliquely upward in a V-shape, the entire support member is supported upward in a V-shape, thereby effectively enhancing its anti-bending, anti-shearing, anti-torsion and anti-deformation performance, thereby ensuring the overall stability of the entire support member. By arranging anti-welding parts on the upper surfaces of the left contact part and the right contact part, the heat generated by the large current can be absorbed, thereby further avoiding the problem of deformation of the left contact part and the right contact part due to high temperature caused by high arc energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings required for describing the prior art are briefly introduced below.

[0014] Figure 1 A schematic diagram of the structure of the utility model;

[0015] Figure 2 A schematic diagram of the cross-sectional structure of the utility model;

[0016] Description of the numbers in the figure:

[0017] 1. Push rod; 2. Support part; 3. Moving iron core; 4. Limiting ring; 5. Limiting plate; 6. Spring; 7. Insulating gasket; 8. Magnetizing block; 9. U-shaped ferrule; 21. Connecting part; 22. Left contact part; 23. Right contact part; 24. Anti-fusion welding part. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0019] Embodiment 1, as Figure 1-2As shown, a moving contact structure of a DC contactor includes a push rod 1 and a support member 2. The lower end of the push rod 1 is connected to a moving iron core 3 of the DC contactor. The upper end of the push rod 1 passes through the support member 2 and is fixedly installed with a limit ring 4. A limit plate 5 is arranged in the middle of the outer surface of the push rod 1. A spring 6 is sleeved between the upper part of the limit plate 5 and the lower part of the support member 2.

[0020] The support member 2 includes a connecting portion 21, a left contact portion 22 and a right contact portion 23, wherein the left contact portion 22 and the right contact portion 23 are respectively connected to the left and right sides of the connecting portion 21, and the left contact portion 22 and the right contact portion 23 are respectively extended obliquely upward in a V-shape, and the connecting portion 21, the left contact portion 22 and the right contact portion 23 are arranged as an integrated structure, so that the entire support member 2 forms a V-shaped structure, and the upper surfaces of the left contact portion 22 and the right contact portion 23 are both provided with an anti-melting welding portion 24. Among them, the anti-melting welding portion 24 is a welding silver point.

[0021] Working principle:

[0022] During use, when the coil assembly of the DC contactor is powered on, the moving iron core will move along the axial direction of the push rod 1 under the action of electromagnetic force, and then drive the support member 2 to move axially through the push rod 1, so that the left contact portion 22 and the right contact portion 23 are respectively in contact with or separated from the static contact; in this embodiment, by extending the left contact portion 22 and the right contact portion 23 in a V-shape and extending obliquely upward, the entire support member 2 is supported upward in a V-shape, thereby effectively enhancing its anti-bending, anti-shearing, anti-torsion, and anti-deformation performance, thereby ensuring the overall stability of the entire support member 2. In addition, by providing an anti-melting welding portion 24 on the upper surface of the left contact portion 22 and the right contact portion 23, the heat generated by the large current can be absorbed, and when the contacts are stuck, the breaking force is increased, and the anti-melting welding performance is improved, thereby further avoiding the problem of deformation of the left contact portion 22 and the right contact portion 23 due to high temperature caused by high arc energy.

[0023] Embodiment 2, as a further preferred embodiment of embodiment 1, a through hole is provided in the middle of the connecting portion 21, a step notch is provided above the through hole, an insulating washer 7 is installed in the through hole, the insulating washer 7 is sleeved on the outer surface of the push rod 1, the upper end of the push rod 1 passes through the through hole and is provided with a limiting groove, the limiting ring 4 is installed in the limiting groove, and the limiting ring 4 is located in the step notch above the through hole. By providing the insulating washer 7 between the push rod 1 and the connecting portion 21, the insulation performance of the push rod 1 and the connecting portion 21 can be ensured, and when the entire support member 2 moves upward, so that the left contact portion 22 and the right contact portion 23 respectively conflict with the static contact, the support member 2 will overcome the elastic force of the spring 6 and move downward along the push rod 1, and at this time, the insulating washer 7 can also be used to effectively avoid the wear problem between the support member 2 and the push rod 1.

[0024] Embodiment 3, as a further preferred solution of embodiment 1, a magnetizing block 8 is installed on the upper surface of the connecting portion 21. By installing the magnetizing block 8 in the middle of the support 2, the magnetic field distribution that affects the contact system can be reduced to reduce the electric repulsion of the contact system. The size of the magnetizing block 8 can be changed according to actual needs so that it will not be repelled when a short circuit occurs, thereby greatly improving the short-term current tolerance capability of the support 2.

[0025] Embodiment 4, as a further preferred solution of embodiment 3, the outer cover of the magnetizing block 8 is provided with a U-shaped clamping sleeve 9, the side of the U-shaped clamping sleeve 9 is provided with a bayonet, the side of the connecting portion 21 is provided with a buckle, and the U-shaped clamping sleeve 9 is fixed by the bayonet and the buckle. Therefore, when installing, it is only necessary to place the magnetizing block 8 above the connecting portion 21, and then use the U-shaped clamping sleeve 9 to cover the magnetizing block 8 in the V-shaped notch formed by the connecting portion 21 and the left contact portion 22 and the right contact portion 23, and fix it by the bayonet and the buckle, so as to achieve the limiting and fixing effect of the magnetizing block 8, and when replacing, it is only necessary to remove the U-shaped clamping sleeve 9, which is convenient and quick.

[0026] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A moving contact structure of a DC contactor, characterized in that: The invention comprises a push rod (1) and a support member (2), wherein the lower end of the push rod (1) is connected to a moving iron core (3) of a DC contactor, and the upper end of the push rod (1) passes through the support member (2) and is fixedly mounted with a limit ring (4); a limit plate (5) is arranged in the middle of the outer surface of the push rod (1), and a spring (6) is sleeved between the upper part of the limit plate (5) and the lower part of the support member (2); The support member (2) comprises a connecting portion (21), a left contact portion (22) and a right contact portion (23); the left contact portion (22) and the right contact portion (23) are respectively connected to the left and right sides of the connecting portion (21); the left contact portion (22) and the right contact portion (23) are respectively extended obliquely upward in a V-shape; the connecting portion (21), the left contact portion (22) and the right contact portion (23) are arranged as an integrated structure; and the upper surfaces of the left contact portion (22) and the right contact portion (23) are both provided with anti-fusion welding portions (24).

2. The moving contact structure of a DC contactor according to claim 1, characterized in that: A through hole is provided in the middle of the connecting portion (21), a step notch is provided above the through hole, an insulating gasket (7) is installed in the through hole, the insulating gasket (7) is sleeved on the outer surface of the push rod (1), the upper end of the push rod (1) passes through the through hole and is provided with a limiting groove, the limiting ring (4) is installed in the limiting groove, and the limiting ring (4) is located in the step notch above the through hole.

3. The moving contact structure of a DC contactor according to claim 1, characterized in that: A magnetizing block (8) is mounted on the upper surface of the connecting portion (21).

4. The moving contact structure of a DC contactor according to claim 3, characterized in that: The outer cover of the magnetizing block (8) is provided with a U-shaped clamping sleeve (9), a bayonet is provided on the side of the U-shaped clamping sleeve (9), a buckle is provided on the side of the connecting portion (21), and the U-shaped clamping sleeve (9) is fixed by clamping the bayonet and the buckle.

5. The moving contact structure of a DC contactor according to claim 1, characterized in that: The anti-melting welding portion (24) is a welding silver point.

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