Alternating current contactor with long service life

Abstract

The utility model relates to an alternating current contactor with long service life, which comprises a shell, a contact system and an electromagnetic system used for driving the contact system to execute opening and closing actions, the contact system comprises a contact frame matched with the electromagnetic system in a linkage mode, a movable contact bridge arranged on the contact frame in a linkage mode and a static contact arranged in the shell and matched with the movable contact bridge, an arc extinguishing piece is arranged at the position, corresponding to the upper portion of the movable contact bridge, in the shell, and an arc extinguishing groove matched with the motion trail of the movable contact bridge is formed in the arc extinguishing piece. A magnetism increasing sheet is attached to the lower end face of the static contact. The utility model has the advantages of simple structure, stable and reliable performance, high assembly efficiency and long service life.

Description

Technical Field

[0001] The utility model relates to an AC contactor, in particular to an AC contactor with a long service life. Background Art

[0002] The working principle of the AC contactor is to use the electromagnetic force and the spring force to achieve the connection and disconnection of the contacts. The AC contactor has two working states: de-energized state (released state) and energized state (operated state). When the attraction coil is energized, the static iron core generates electromagnetic attraction, the armature is attracted, and the connecting rod connected to the armature drives the contact bridge to move, so that the normally closed contact is disconnected and the contactor is in the energized state; when the attraction coil is de-energized, the electromagnetic attraction disappears, the armature is reopened, the normally open contact is closed, and the position spring is released, all contacts are reset, and the contactor is in the de-energized state. The AC contactor includes a housing, an electromagnetic system, and a contact system. The arc extinguishing performance of the contact system of the existing AC contactor is poor, and the contacts are easily burned by the arc, resulting in a short electrical service life of the AC contactor. In addition, the AC contactor also has the defects of complex structure, unreliable performance, and inconvenient assembly. Summary of the invention

[0003] The utility model aims to overcome the defects of the prior art and provide an AC contactor with simple structure, stable and reliable performance, high assembly efficiency and long service life.

[0004] To achieve the above-mentioned purpose, the utility model adopts an AC contactor with a long service life, including a shell, a contact system, and an electromagnetic system for driving the contact system to perform opening and closing actions. The contact system includes a contact frame that cooperates with the electromagnetic system, a moving contact bridge that is linked to the contact frame, and a static contact that is arranged in the shell and cooperates with the moving contact bridge. An arc extinguishing plate is arranged in the shell above the corresponding moving contact bridge. The arc extinguishing plate has an arc extinguishing groove that matches the movement trajectory of the moving contact bridge, and a magnetizing plate is attached to the lower end surface of the static contact.

[0005] The beneficial effect of the above structure is that: a magnetizing sheet is arranged on the static contact, which can play a role of magnetic blowing, and the arc between the static contact and the moving contact bridge can quickly enter the arc extinguishing sheet, and the arc extinguishing sheet above the moving contact bridge can quickly extinguish the arc, thereby avoiding arc ablation of the moving contact bridge and the static contact, which is beneficial to prolonging the service life of the contact system. In addition, the contact system adopts a modular structure design, and the assembly efficiency is higher. Therefore, the AC contactor has the advantages of simple structure, stable and reliable performance, high assembly efficiency and long service life.

[0006] Specifically, a positioning boss is arranged at one end of the static contact corresponding to the static contact point, and a positioning groove is arranged at one end of the magnetic enhancement sheet. The positioning boss is clamped in the positioning groove, and the clamping fit between the magnetic enhancement sheet and the static contact is formed. The magnetic enhancement sheet and the static contact are assembled by a clamping fit method, and the assembly is more convenient.

[0007] Specifically, clamping grooves are respectively arranged on both sides of the arc extinguishing sheet in the shell. Both sides of the arc extinguishing sheet are clamped in the clamping grooves, and the clamping fit between the arc extinguishing sheet and the shell is formed. The arc extinguishing sheet and the shell are assembled by a clamping fit method, and the assembly is more convenient.

[0008] Specifically, an anti-disengagement sheet matched with the shell is arranged on the arc extinguishing sheet, a limiting convex block matched with the anti-disengagement sheet is arranged in the shell, and the anti-disengagement sheet abuts against the limiting convex block, and the limiting fit between the anti-disengagement sheet and the limiting convex block is formed. The anti-disengagement sheet can play a role in preventing disengagement, so as to ensure that the connection between the arc extinguishing sheet and the shell is more compact.

[0009] Specifically, a spring is arranged between the moving contact bridge and the contact holder. A limiting boss clamped on one end of the spring is arranged on the moving contact bridge, and a limiting block clamped on the other end of the spring is arranged on the contact holder. The spring can increase the contact pressure of the moving contact bridge, ensure the contact reliability between the moving contact bridge and the static contact, and the spring is clamped between the moving contact bridge and the contact holder, so as to facilitate the assembly of the spring with the moving contact bridge and the contact holder, and the assembly is more convenient. Description of the Drawings

[0010] Figure 1 It is a structural diagram of an embodiment of the present invention.

[0011] Figure 2 It is a structural diagram of the contact system of an embodiment of the present invention.

[0012] Figure 3 It is a three-dimensional view of the arc extinguishing sheet of an embodiment of the present invention.

[0013] Figure 4 It is a three-dimensional view of the magnetic enhancement sheet of an embodiment of the present invention. Detailed Embodiment

[0014] Such as Figures 1 to 4As shown, the embodiment of the utility model is an AC contactor with a long service life, comprising a housing 10, a contact system 20, and an electromagnetic system 11 for driving the contact system 20 to perform opening and closing actions. The contact system 20 comprises a contact frame 21 that cooperates with the electromagnetic system 11, a moving contact bridge 22 that is arranged on the contact frame 21 in a linkage manner, and a stationary contact 23 that is arranged in the housing 10 and cooperates with the moving contact bridge 22. An arc extinguishing piece 24 is arranged in the housing 10 at the position corresponding to the upper part of the moving contact bridge 22. The arc extinguishing piece 24 has an arc extinguishing groove 241 that matches the motion trajectory of the moving contact bridge 22. A magnetizing piece 25 is attached to the lower end surface of the stationary contact 23. A positioning boss 232 is arranged at one end of the stationary contact 23 at a position corresponding to the stationary contact point 231, and a positioning groove 251 is arranged at one end of the magnetizing piece 25. The positioning boss 232 is engaged in the positioning groove 251, and constitutes a snap-fitting of the magnetizing piece 25 and the stationary contact 23. The magnetizing sheet and the static contact are assembled by snap-fitting, which makes assembly more convenient. The shell 10 is provided with snap-fitting grooves 101 at both sides of the arc-extinguishing sheet 24. The two sides of the arc-extinguishing sheet 24 are snapped into the snap-fitting grooves 101, and the snap-fitting between the arc-extinguishing sheet 24 and the shell 10 is formed. The arc-extinguishing sheet and the shell are assembled by snap-fitting, which makes assembly more convenient. The arc-extinguishing sheet 24 is provided with an anti-slip sheet 242 that matches the shell 10. The shell 10 is provided with a limiting protrusion 102 that matches the anti-slip sheet 242. The anti-slip sheet 242 abuts against the limiting protrusion 102, and the limiting cooperation between the anti-slip sheet 242 and the limiting protrusion 102 is formed. The anti-slip sheet can play an anti-slipping role, thereby ensuring that the connection between the arc-extinguishing sheet and the shell is more compact.

[0015] like Figure 2 As shown, a spring 26 is provided between the moving contact bridge 22 and the contact frame 21, a limiting boss 221 is provided on the moving contact bridge 22 and engaged with one end of the spring 26, and a limiting block 211 is provided on the contact frame 21 and engaged with the other end of the spring 26. The spring can increase the contact pressure of the moving contact bridge, and can ensure the contact reliability between the moving contact bridge and the static contact, and the spring is engaged between the moving contact bridge and the contact frame, so as to facilitate the assembly of the spring, the moving contact bridge and the contact frame, and the assembly is more convenient.

[0016] A magnetizing sheet is provided on the static contact, which can play a role of magnetic blowing. The arc between the static contact and the moving contact bridge can quickly enter the arc extinguishing sheet, and the arc extinguishing sheet above the moving contact bridge can quickly extinguish the arc, thereby avoiding arc ablation of the moving contact bridge and the static contact, which is beneficial to prolonging the service life of the contact system. In addition, the contact system adopts a modular structure design, which has higher assembly efficiency. Therefore, the AC contactor has the advantages of simple structure, stable and reliable performance, high assembly efficiency and long service life.

Claims

1. An AC contactor with a long service life, comprising a housing, a contact system, and an electromagnetic system for driving the contact system to perform opening and closing actions, characterized in that: The contact system includes a contact frame that cooperates with the electromagnetic system, a moving contact bridge that is linked to the contact frame, and a static contact that is arranged in a shell and cooperates with the moving contact bridge. An arc extinguishing plate is arranged above the moving contact bridge in the shell, and the arc extinguishing plate has an arc extinguishing groove that matches the movement trajectory of the moving contact bridge. A magnetizing plate is attached to the lower end surface of the static contact.

2. The AC contactor with a long service life according to claim 1, characterized in that: A positioning boss is arranged on one end of the stationary contact corresponding to the stationary contact point, and a positioning groove is arranged on one end of the magnetizing sheet. The positioning boss is engaged in the positioning groove to form a snap fit between the magnetizing sheet and the stationary contact.

3. The AC contactor with a long service life according to claim 1 or 2, characterized in that: The shell is provided with clamping grooves at both sides of the arc-extinguishing piece, and the two sides of the arc-extinguishing piece are clamped in the clamping grooves to form a clamping fit between the arc-extinguishing piece and the shell.

4. The AC contactor with a long service life according to claim 1 or 2, characterized in that: The arc extinguishing piece is provided with an anti-dropping piece matched with the shell, and a limiting convex block matched with the anti-dropping piece is arranged in the shell. The anti-dropping piece abuts against the limiting convex block, and the limiting cooperation between the anti-dropping piece and the limiting convex block is formed.

5. The AC contactor with long service life according to claim 1 or 2, characterized in that: A spring is arranged between the moving contact bridge and the contact frame, a limiting boss engaged with one end of the spring is arranged on the moving contact bridge, and a limiting block engaged with the other end of the spring is arranged on the contact frame.

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