Iron core group of alternating current contactor

Abstract

The utility model relates to the technical field of electric appliance accessories, and discloses an alternating current contactor iron core group which comprises a static iron core and a movable iron core. The static iron core is provided with a groove body. A protruding body is arranged on the movable iron core. And the convex body is arranged in the groove body. The static iron core and the movable iron core are respectively provided with a short circuit ring. Aiming at the defects in the prior art, the utility model aims to provide the iron core group of the alternating current contactor, which can form axial automatic accurate positioning suction between the movable iron core and the static iron core, has a power-off easy return function and runs without noise. The end faces of the movable iron core side column and the static iron core side column are of plane structures. Short circuit rings mounted on respective side columns of a movable iron core and a static iron core of the iron core group are independently arranged on the side columns at non-corresponding positions, namely acting force generated by the short circuit rings for eliminating alternating current noise is uniformly distributed on the movable iron core and the static iron core.

Description

Technical Field

[0001] The utility model relates to the technical field of electrical accessories, in particular to an AC contactor iron core group. Background Art

[0002] To be precise, a contactor is an electrically controlled, high-current, multi-contact combination switch. Its working principle is: using the current flowing through the electromagnetic coil to generate a magnetic field on the iron core assembly, relying on the movement of the iron core assembly to pull the electric contacts closed and opened, thereby controlling the power supply to the load electrical appliances.

[0003] In the prior art, one of the elements that generate magnetic field power conversion on the contactor is the core assembly, which is composed of a plurality of E-shaped silicon steel sheets that are stacked and riveted with rivets to form an E-shaped three-column structure of two parts, the moving iron core and the static iron core, and arranged in an E-shape with two side columns and one middle column. The end faces of the E-shaped three-column of the moving iron core and the static iron core are arranged corresponding to each other. The two E-shaped three-column end faces are often designed to be pure planes on the same horizontal plane. After attracting each other during operation, they are tightly joined to minimize the air gap as much as possible, which will reduce noise while improving the utilization rate of magnetic conductivity. In order to ensure the implementation of the above design, it is necessary to first ensure that the end faces of the E-shaped three-column of the moving iron core and the static iron core are accurately and tightly joined, and no displacement can occur. Therefore, positioning components such as slideways and fixed brackets of the standardized core group are often provided on the contactor.

[0004] The implementation of the above-mentioned guarantee setting also brings some drawbacks. One of them is: the pursuit of the end face of the column to achieve a pure plane on the same horizontal plane is often processed by a grinder polishing process. The end face is as bright as a mirror and needs to be coated with anti-rust grease. The contactor is particularly ideal when working in a normal environment, but when the contactor is used for a long time in a high temperature and dusty environment, there will be a phenomenon that the contactor cannot be turned off. Even if the power supply core assembly of the electromagnetic coil is disconnected, it cannot be separated and returned. The main reason is that the anti-rust grease coated on the end faces of the two E-shaped three-column bodies of the moving iron core and the static iron core has been working in a high temperature and dusty environment for a long time. The viscosity of the grease becomes thicker. The end faces of the three columns will exclude the air in the end face air gap after precise and tight joint under the strong pressure of the electromagnetic force. At the same time, the sealing effect of the thickened grease will form an extreme vacuum state at the end face air gap. At this time, even if the power supply of the electromagnetic coil is disconnected, the return spring will hardly separate the core assembly and return it, causing the contactor to be unable to return the contact. Even if it is reluctantly returned, it will cause delayed shutdown, that is, the power supply to the controlled electrical appliance cannot be cut off in time. Therefore, it may cause damage to the equipment or other accidents. Secondly, in order to ensure that the E-shaped three-column end faces of the moving iron core and the static iron core are accurately joined without displacement, positioning components such as slideways and fixed brackets are set on the contactor. The increase of accessories will increase production costs and make the overall structure of the contactor complicated. At the same time, it also requires manual installation and adjustment. Long-term and frequent movements of positioning components will inevitably cause wear and looseness, which can easily lead to positional displacement between the moving iron core and the static iron core, generate vibration noise, or directly affect the normal use of the AC contactor.

[0005] There was a patent CN 205303347 U "An AC contactor core group" that aimed at the defect of displacement caused by precise connection of the E-shaped three-column end faces of the moving iron core and the static iron core of the existing products, and specially set square convex and concave positioning blocks and positioning grooves on the core group. However, this design only solves the displacement problem after the attraction, and does not completely solve the above two major defects. Since the patent design uses square convex and concave positioning blocks and positioning grooves for positioning, the docking of the convex blocks and the grooves is still a flat contact with the ends (no taper), so the core group must also have auxiliary guide rails and slide grooves to accurately align the position before the initial attraction. The biggest defect of this design is that the positioning blocks are set on the two side columns, and the docking area of ​​the side columns is much smaller than that of the middle column, and it is still a flat attraction docking structure. The biggest fatal defect in the existing products is that the power supply core assembly of the electromagnetic coil cannot be separated and returned to its position when the middle column breaks. The main reason is that the end face of the middle column reaches a bright mirror-like pure plane on the same horizontal plane. Therefore, focusing on the transformation of the end face of the center column is the key to completely solving the problem.

[0006] In order to solve the shortcomings of the above-mentioned existing patent technology, patent CN205609449U "Combined AC Contactor Core" aims at the disadvantage of the existing technology that the power supply core assembly of the electromagnetic coil cannot be separated and returned. The three columns of the E-shaped core of the core group are modified to match the protrusion structure with the V-shaped groove, and the structure of the flat docking method is replaced by the inclined surface docking, which effectively solves the problem that the power supply core assembly of the electromagnetic coil cannot be separated and returned. However, there is still a shortcoming, that is, the patent strives to achieve the return effect, and the three columns of the core group are changed to the inclined surface docking structure, so the core has no position to install the short-circuit ring device to eliminate AC noise. The short-circuit ring is currently the simplest, most effective and indispensable device to solve AC noise. The so-called short-circuit ring is a short-circuit coil formed by a turn of wire, which is installed on the local iron core of the magnetic core. The short-circuit coil produces a lagging magnetic field in the local area of ​​the iron core. This local lagging magnetic field is used to maintain the jitter generated by the iron core when the alternating current loses magnetism when zero passing. Therefore, if an AC noise elimination device is not set up, the service life will be reduced.

[0007] In order to solve the above problems, we propose an AC contactor core group. Utility Model Content

[0008] The purpose of the utility model is to provide an AC contactor core assembly to solve the problems raised in the above background technology.

[0009] To achieve the above object, the utility model provides the following technical solution: an AC contactor core assembly, comprising a static core and a moving core; the static core is provided with a groove body; the moving core is provided with a protrusion body; the protrusion body is arranged in the groove body;

[0010] A short-circuit ring is respectively provided on the static iron core and the moving iron core.

[0011] Preferably, the static iron core and the moving iron core are both E-type structures; the static iron core is provided with two static iron core side columns and one static iron core middle column; the static iron core middle column is arranged between the two static iron core side columns; the moving iron core is provided with two moving iron core side columns and one moving iron core middle column; the moving iron core middle column is arranged between the two moving iron core side columns.

[0012] Preferably, the two short-circuit rings are arranged on non-corresponding side columns of the static iron core and the moving iron core.

[0013] Preferably, the cross-sections of the protrusion and the groove are both conical.

[0014] Preferably, the tip angles of the protrusion and the groove are both 60 degrees.

[0015] Preferably, a plurality of positioning holes are provided on the static iron core and the moving iron core.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The utility model designs the contact surface of the middle column of the two cores to be coupled with an inclined surface, and converts the direct pulling force of the existing core group in the release and return process into an inclined sliding force, effectively overcoming the vacuum force generated by the plane contact mode, thereby avoiding the disadvantages of the AC contactor that the power cannot be cut off and the power is delayed. The contact surface of the two cores is designed to be coupled with an inclined surface, which significantly reduces the main magnetic flux air gap of the middle column of the moving core and the middle column of the static core, increases the magnetic flux, and enhances the attraction.

[0018] 2. The utility model also has a planar structure for the end faces of the moving iron core side column and the static iron core side column, and a short-circuit ring 4 is separately installed on one of the moving iron core side columns and the static iron core side column. The short-circuit ring 4 installed on the side columns of the moving iron core 21 and the static iron core 1 of the core group is separately arranged on the side columns at non-corresponding positions, that is, the force generated by the short-circuit ring 4 for eliminating AC noise is evenly distributed on the moving iron core 21 and the static iron core 1. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front cross-sectional view of the utility model in a released state;

[0020] Figure 2 It is a front cross-sectional view of the utility model in the suction state;

[0021] Figure 3 It is a three-dimensional view of the moving iron core of the utility model;

[0022] Figure 4 It is a three-dimensional view of the static iron core of the utility model.

[0023] In the figure: 1-static iron core, 2-groove body, 21-moving iron core, 22-protrusion body, 3-rivet, 4-short-circuit ring. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 The utility model provides a technical solution: an AC contactor iron core assembly, mainly composed of a plurality of E-shaped silicon steel sheets, which are stacked and riveted with rivets 3 to form a two-part E-shaped three-column structure of the moving iron core 21 and the static iron core 1. The moving iron core 21 and the static iron core 1 are arranged in an E-shape with two side columns and one middle column.

[0026] The utility model designs the middle column end surface of the moving iron core 21 in the iron core group into a conical protrusion 22. Figure 3 The middle column end face of the static iron core 1 is designed to be a cone, and the groove body 2 is referred to Figure 4 The outer dimensions and angles of the conical protrusion 22 and the conical groove 2 are completely coupled. The conical protrusion 22 and the conical groove 2 form two-sided acute-angle end guidance and positioning to avoid positional offset between the moving iron core 21 and the static iron core 1. The conical protrusion 22 and the conical groove 2 are directly set on the E-shaped silicon steel sheet itself, without any accessories, and without increasing material costs.

[0027] The sharp end angles of the conical protrusion 22 and the conical groove 2 are both 60 degrees. When the core group moves the moving core 21 toward the static core 1 under the attraction of the electromagnetic field, it is an ideal setting structure for the sharp end angles to be 60 degrees. The two side bevels corresponding to the 60-degree angle of each of the two cores will generate a guiding force toward the center of the acute angle end, which effectively ensures that the two cores are accurately attracted and positioned. While ensuring stability, the normal movement of the core group will not be affected by the resistance generated by the return guide. When the power is off and the magnetic field is lost, the two cores are automatically and easily released and separated under the action of the contactor return spring. See Figure 1 .

[0028] Since the utility model designs the contact surfaces of the middle columns of the two iron cores to be coupled with inclined surfaces, the direct pulling force of the existing iron core group in the release and return process is converted into the inclined sliding force, which effectively overcomes the vacuum force generated by the plane contact mode, thereby avoiding the disadvantages of the AC contactor that the power cannot be cut off and the power is delayed. The contact surfaces of the two iron cores are designed to be coupled with inclined surfaces, which significantly reduces the main magnetic flux air gap of the middle column of the moving iron core and the middle column of the static iron core, increases the magnetic flux, and enhances the attraction.

[0029] The protrusion 22 and the groove 2 in the utility model have a magnetic flux air gap b in the coupling mode. The three columns in the prior art are all vertical magnetic flux air gaps a. Compared with the two, the utility model is significantly stronger in the attraction force. Under the condition of the same stroke of the core assembly, the electromagnetic coil of the utility model can be further designed to reduce power consumption.

[0030] The utility model is mainly designed to modify the middle column of the core assembly. Because the two side columns in the prior art have very small column end areas, the contact surface is even smaller after deducting the structural area set above. Compared with the middle column, the contact surface is a completely solid area, and the vacuum force generated is stronger. Therefore, the modification of the middle column is the key to the utility model. In order to further reduce the force of the two side column end areas to generate the plane vacuum of the contact surface and concentrate it on the same core, the utility model also makes the moving core side column and the static core side column, and the column end face is a planar structure, and a short-circuit ring 4 is separately installed on one of the moving core side column and the static core side column. The short-circuit ring 4 installed on the side column of the moving core 21 and the static core 1 of the core group is separately set on the side column at a non-corresponding position, that is, the force generated by the short-circuit ring 4 for eliminating AC noise is evenly distributed on the moving core 21 and the static core 1.

[0031] The utility model has a simple design and positioning structure, and the coordinated operation is intuitive and concise. Compared with the existing AC contactor core group, it reduces the guide positioning accessories, thereby saving production costs and also saving the time for production, assembly and debugging.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0033] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An AC contactor core assembly, characterized in that: It comprises a static iron core (1) and a moving iron core (21); the static iron core (1) is provided with a groove body (2); the moving iron core (21) is provided with a protrusion body (22); the protrusion body (22) is arranged in the groove body (2); A short-circuit ring (4) is respectively provided on the static iron core (1) and the moving iron core (21).

2. The AC contactor core assembly according to claim 1, characterized in that: The static iron core (1) and the moving iron core (21) are both of E-type structure; the static iron core (1) is provided with two static iron core side columns and one static iron core middle column; the static iron core middle column is arranged between the two static iron core side columns; the moving iron core (21) is provided with two moving iron core side columns and one moving iron core middle column; the moving iron core middle column is arranged between the two moving iron core side columns.

3. The AC contactor core assembly according to claim 2, characterized in that: The two short-circuit rings (4) are arranged on non-corresponding side columns of the static iron core and the moving iron core.

4. The AC contactor core assembly according to claim 1, characterized in that: The cross sections of the protrusion (22) and the groove (2) are both conical.

5. The AC contactor core assembly according to claim 4, characterized in that: The tip angles of the protrusion (22) and the groove (2) are both 60 degrees.

6. The AC contactor core assembly according to claim 1, characterized in that: The static iron core (1) and the moving iron core (21) are both provided with a plurality of positioning holes for installing rivets (3).

Images