Electromagnetic system for contactors

Abstract

The utility model discloses an electromagnetic system for contactor, including the installation crossbeam in alternating current vacuum contactor, the installation crossbeam on fixed mounting has left and right two side plates, and the static iron core and the coil are installed between two side plates, the side plate on through the slot movable intercalation and install the pivot, the pivot central through connecting lever and install the dynamic iron core subassembly, the dynamic iron core subassembly is by a plurality of cold rolled steel sheets superposition, and through the structure of rivet group riveting pressure, the surface treatment of steel plate is burrless, the left and right sides of cold rolled steel plate are the semicircular structure of with the shape cooperation of coil, and the connection of pivot lever's cooperation can make the connection intensity increase, reduce the heating, reduce the eddy current loss, promote the magnetic response speed.

Description

Technical Field

[0001] This utility model relates to the field of contactor structure technology, and in particular to an electromagnetic system for contactors. Background Technology

[0002] Compared to circuit breakers, contactors are used more frequently and have higher reliability requirements. The operating mechanism consists of a closing coil with an iron core and an armature. When the coil is energized or de-energized, it drives the armature to move, thereby closing or opening the contactor.

[0003] The existing technology has the following problems:

[0004] 1. The high starting current generates a strong initial attraction force, causing the moving iron core to rapidly strike the coil iron core, which exacerbates the wear of the iron core;

[0005] 2. The Joule heating generated by the current causes the coil and core to heat up, affecting the system's reliability and lifespan;

[0006] 3. There is a contradiction between reducing the holding current and ensuring reliable holding. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide an electromagnetic system for contactors in order to overcome the shortcomings of the existing technology.

[0008] The technical solution adopted by this utility model to solve its technical problem is: an electromagnetic system for a contactor, including a mounting beam installed in an AC vacuum contactor, two side plates fixedly installed on the mounting beam, a stationary iron core and a coil installed between the two side plates, a rotating shaft movably inserted and installed on the side plates through slots, and a moving iron core assembly installed in the center of the rotating shaft through a connecting lever.

[0009] The moving iron core assembly is a structure made of several stacked cold-rolled steel plates and riveted together with a rivet group; the surface of the steel plates is burr-free; the left and right sides of the cold-rolled steel plates are semi-circular structures that match the shape of the coil;

[0010] The rivet group consists of four rivets arranged in a parallelogram, with two rivets installed at the center of the corresponding semi-circular structure.

[0011] Furthermore, the mounting beam of this utility model is provided with a limiting block that cooperates with the moving iron core assembly;

[0012] By adopting the above technical solution, a limit protrusion is provided at the bottom of the outer side of the moving iron core assembly, and the limit block on the mounting beam plays a limiting role in the moving iron core assembly.

[0013] Furthermore, the left and right ends of the rotating shaft described in this utility model are provided with switch levers that cooperate with the auxiliary switch inside the AC vacuum contactor.

[0014] By adopting the above technical solution, the rotation of the shaft drives the switch lever to rotate synchronously and hit the auxiliary switch, thus switching the state of the auxiliary switch.

[0015] Furthermore, the diameter of the stationary iron core of this utility model is 25mm to 37mm, and the diameter of the copper wire of the coil is 0.6mm to 0.8mm;

[0016] By adopting the above technical solution, the magnetic induction intensity can be saturated and the material cost can be reduced.

[0017] Furthermore, the moving iron core assembly and the connecting lever described in this utility model are assembled through the cooperation of positioning pin holes and screws.

[0018] The beneficial effects of this utility model are:

[0019] 1. In the electromagnetic system of the contactor of this utility model, the moving iron core adopts a structure of four layers of cold-rolled steel plates, and uses a parallelogram positioning connection with rivets, combined with the connection of the rotating shaft lever, which can increase the connection strength, reduce heat generation, reduce eddy current loss, and improve the magnetic response speed.

[0020] 2. The rotating shaft assembly integrates the side plate and the switch lever, serving both lateral protection and functional linkage purposes;

[0021] 3. The diameter parameters of the coil core and the coil copper wire have been optimized, which allows the magnetic induction intensity to reach saturation and reduces material costs;

[0022] 4. The structural profile of the moving iron core is designed to conform to the shape of the impact surface of the coil iron core, which effectively reduces the problem of iron core wear that is more likely to occur when a moving iron core with a conventional general structure is impacted. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a structural schematic diagram from another perspective of the present invention.

[0026] The following are the labels in the diagram: 1. Mounting beam, 2. Side plate, 3. Static iron core, 4. Coil, 5. Slot, 6. Shaft, 7. Connecting lever, 8. Cold-rolled steel plate, 9. Rivet, 10. Limiting block, 11. Switch lever, 12. Screw. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] like Figure 1 and Figure 2 An electromagnetic system for a contactor is shown, including a mounting beam 1 installed inside an AC vacuum contactor. Two side plates 2 are fixedly installed on the mounting beam 1. A stationary iron core 3 and a coil 4 are installed between the two side plates 2. A rotating shaft 6 is movably inserted and installed on the side plates 2 through a slot 5. A moving iron core assembly is installed in the center of the rotating shaft 6 through a connecting lever 7.

[0029] The moving iron core assembly is a structure consisting of several cold-rolled steel plates 8 stacked together and riveted together by a rivet group; the left and right sides of the cold-rolled steel plates 8 are semi-circular structures that match the shape of the coil 4;

[0030] The rivet assembly consists of four rivets 9 arranged in a parallelogram, with two of the rivets 9 installed at the center of the corresponding semi-circular structure.

[0031] The mounting beam 1 is equipped with a limiting stop 10 that cooperates with the moving iron core assembly. The left and right ends of the rotating shaft 6 are equipped with switch levers 11 that cooperate with the auxiliary switches inside the AC vacuum contactor.

[0032] The diameter of the new static iron core 3 is 25mm to 37mm, and the diameter of the copper wire of the coil 4 is 0.6mm to 0.8mm.

[0033] The moving iron core assembly and the connecting lever 7 are assembled through the engagement of the locating pin hole and the screw 12.

[0034] Working principle:

[0035] The moving iron core assembly is assembled with the rotating shaft by using the positioning pin hole and screw fastening of the connecting lever. After the coil is energized, the moving iron core assembly hits the coil due to the attraction and then remains attracted. The rotating shaft remains stable under the support of the side plate. At the same time, the side plate protects the coil from external interference. The rotation of the rotating shaft drives the switch lever to rotate synchronously and hit the auxiliary switch, switching the state of the auxiliary switch.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. An electromagnetic system for a contactor, characterized in that: The device includes a mounting beam (1) installed inside the AC vacuum contactor. Two side plates (2) are fixedly installed on the mounting beam (1). A stationary iron core (3) and a coil (4) are installed between the two side plates (2). A rotating shaft (6) is movably inserted and installed on the side plate (2) through a slot (5). A moving iron core assembly is installed in the center of the rotating shaft (6) through a connecting lever (7). The moving iron core assembly is a structure consisting of several cold-rolled steel plates (8) stacked together and riveted together by a rivet group; the left and right sides of the cold-rolled steel plates (8) are semi-circular structures that match the shape of the coil (4); The rivet group consists of four rivets (9) arranged in a parallelogram, with two rivets (9) installed at the center of the corresponding semi-circular structure.

2. The electromagnetic system for a contactor as described in claim 1, characterized in that: The mounting beam (1) is provided with a limiting block (10) that cooperates with the moving iron core assembly.

3. The electromagnetic system for a contactor as described in claim 1, characterized in that: The left and right ends of the rotating shaft (6) are provided with switch levers (11) that cooperate with the auxiliary switch inside the AC vacuum contactor.

4. The electromagnetic system for a contactor as described in claim 1, characterized in that: The diameter of the stationary iron core (3) is 25mm to 37mm, and the diameter of the copper wire of the coil (4) is 0.6mm to 0.8mm.

5. The electromagnetic system for a contactor as described in claim 1, characterized in that: The moving iron core assembly and the connecting lever (7) are assembled by the cooperation of the positioning pin hole and the screw (12).

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