CN215680551U

CN215680551U - Magnetic circuit positioning mechanism for preventing side suction of contactor

Info

Publication number: CN215680551U
Application number: CN202121639593.8U
Authority: CN
Inventors: 刘志伟; 施生圣; 唐家安; 张瑞
Original assignee: Churod Electronics Co ltd
Current assignee: Churod Electronics Co ltd
Priority date: 2021-07-19
Filing date: 2021-07-19
Publication date: 2022-01-28
Anticipated expiration: 2031-07-19

Abstract

The utility model relates to the technical field of contactors, in particular to a magnetic circuit positioning mechanism for preventing a contactor from side suction. The flat yoke is fixed through a wire frame with a mounting hole, a through hole is formed in the flat yoke, a movable iron core penetrates through the flat yoke and can be movably arranged in the mounting hole in a penetrating mode, a positioning structure used for limiting the movable iron core is formed in the inner side wall of the mounting hole, when the movable iron core moves back and forth in the mounting hole along the axial direction, the movable iron core is limited in the radial direction through the positioning structure, a certain distance gap is kept between the movable iron core and the inner side wall of the through hole of the flat yoke, the phenomenon that a magnetic closing loop causes side attraction is avoided when the movable iron core is in contact with the flat yoke in the moving process, the gap between the movable iron core and the flat yoke is small but not in contact with each other through the size of the positioning structure, interference of deformation of the inner hole of the wire frame on the movable iron core is avoided, and the purpose of guaranteeing large magnetic force is achieved.

Description

Magnetic circuit positioning mechanism for preventing side suction of contactor

Technical Field

The utility model relates to the technical field of contactors, in particular to a magnetic circuit positioning mechanism for preventing a contactor from side suction.

Background

The low-voltage contactor is widely used as a switching-on/off and control circuit of an industrial power supply, a new energy automobile and a 5G communication power supply. The low-voltage contactor utilizes the contact to open and close the circuit, and the contact is used for executing a control command so as to play a role in remote control or weak current control of strong current. In the existing low-voltage contactor, the positioning mode of the movable iron core is that the movable iron core is positioned through an inner hole of a flat plate yoke, and when the movable iron core reciprocates along the inner hole of the flat plate yoke, the movable iron core can inevitably contact with the inner hole of the flat plate yoke to cause a magnetic closed loop, so that the problem of side attraction is caused.

In the prior art, a circular copper sleeve is additionally arranged between a flat yoke and a movable iron core, the magnetic isolation is realized by utilizing the principle that the copper sleeve does not conduct magnetism, but the copper sleeve is difficult to form and is difficult to install, and the magnetic gap is increased after the copper sleeve is installed, so that the serious problem of magnetic leakage is caused. Still some are glued on the surface of the movable iron core or coated with insulating material teflon, but because the movable iron core is a movable part, the movable iron core can rub with the inner hole of the flat plate yoke for a long time to cause the damage of the adhesive tape and the abrasion of the teflon, thereby causing the contact of the movable iron core and the flat plate yoke to cause side suction.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a magnetic circuit positioning mechanism for preventing side suction of a contactor, which comprises a wire frame, a flat yoke and a movable iron core, wherein the center of the wire frame is penetrated with a mounting hole, the flat yoke is fixed on the end surface of the wire frame, and the movable iron core is movably penetrated in the flat yoke and the mounting hole; a positioning structure for limiting the movable iron core is formed on the inner side wall of the mounting hole; the positioning structure limits the movable iron core to enable the flat plate yoke and the movable iron core to keep a distance.

Preferably, the positioning structure comprises a plurality of half cylinders extending along the axial direction of the mounting hole, and the half cylinders are annularly distributed on the inner side wall of the mounting hole.

Preferably, the electromagnetic assembly comprises a static iron core, a coil and a U-shaped yoke, wherein the static iron core is in contact with the movable iron core to form a magnetic loop, the coil is wound on the periphery of the wire frame, and the U-shaped yoke is sleeved at the bottom of the wire frame; an elastic part is arranged between the movable iron core and the static iron core.

Preferably, the bottom of the movable iron core is provided with a first mounting groove for accommodating the elastic piece; and a second mounting groove for accommodating the elastic piece is formed in the top surface of the static iron core.

Preferably, the coil pin connected with the coil is installed at the top of the coil holder.

Preferably, the flat plate yoke is formed with a through hole for the movable iron core to pass through; the positioning structure limits the movable iron core to enable the movable iron core and the inner side wall of the through hole to keep a distance.

Preferably, the bottom of the static iron core is provided with a fixed block, and the U-shaped yoke is provided with a limit hole for fixing the fixed block.

From the above, the following beneficial effects can be obtained by applying the utility model: the flat yoke is fixed through a wire frame with a mounting hole, a through hole is formed in the flat yoke, a movable iron core penetrates through the flat yoke and can be movably arranged in the mounting hole in a penetrating mode, a positioning structure used for limiting the movable iron core is formed in the inner side wall of the mounting hole, when the movable iron core moves back and forth in the mounting hole along the axial direction, the movable iron core is limited in the radial direction through the positioning structure, a certain distance gap is kept between the movable iron core and the inner side wall of the through hole of the flat yoke, the phenomenon that a magnetic closing loop causes side attraction is avoided when the movable iron core is in contact with the flat yoke in the moving process, the gap between the movable iron core and the flat yoke is small but not in contact with each other through the size of the positioning structure, interference of deformation of the inner hole of the wire frame on the movable iron core is avoided, and the purpose of guaranteeing large magnetic force is achieved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the utility model, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is an exploded view of a magnetic circuit positioning mechanism for preventing side-draw of a contactor according to an embodiment of the present invention;

fig. 2 is a cross-sectional view of a magnetic circuit positioning mechanism for preventing side suction of a contactor according to an embodiment of the utility model.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the utility model, and not restrictive of the full scope of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In order to solve the above technical problems, the present embodiment provides a magnetic circuit positioning mechanism for preventing side attraction of a contactor, as shown in fig. 1-2, including a wire frame 10 having a mounting hole 11 penetrating through the center thereof, and a plate yoke 30 fixed to an end surface of the wire frame 10, wherein the plate yoke 30 has a through hole 31, a movable iron core 20 movably penetrates through the through hole 31 of the plate yoke 30 and is disposed in the mounting hole 11, a positioning structure 12 for limiting the movable iron core 20 is formed on an inner side wall of the mounting hole 11, when the movable iron core 20 reciprocates in the mounting hole 11 along an axial direction, the positioning structure 12 limits a radial direction of the movable iron core 20, so as to ensure that a certain distance gap is maintained between the movable iron core 20 and an inner side wall of the through hole 31 of the plate yoke 30, thereby preventing a side attraction phenomenon caused by a magnetic closing loop due to the movable iron core contacting with the plate yoke, and ensuring that the gap between the movable iron core and the plate yoke is small but not contacting with each other by controlling a size of the positioning structure 12, the interference of the deformation of the inner hole of the wire frame 10 to the movable iron core 20 is avoided, and the purpose of ensuring large magnetic force is realized.

Specifically, location structure 12 includes a plurality of halfcylinders along the axial extension of mounting hole 11, a plurality of halfcylinders are cyclic annular and distribute at the inside wall of mounting hole 11, and then move iron core 20 when mounting hole 11 reciprocating motion, the halfcylinder through the mounting hole 11 inside wall leads to moving iron core 20, and then avoid moving iron core 20 and taking place the side-draught with the inside wall contact of the through-hole 31 of dull and stereotyped yoke 30, the diameter of a plurality of halfcylinders and the circle that moves iron core 20 contact point and constitute is less than the diameter of the through-hole 31 of dull and stereotyped yoke 30, and then ensure to move iron core 20 and keep away from with the inside wall of the through-hole 31 of dull and stereotyped yoke 30. Preferably, the number of the semi-cylinders is 6, and 6 semi-spherical cylinders enable a gap to be formed between the movable iron core 20 and the inner side wall of the mounting hole 11, so that air circulation is facilitated, and the movable iron core 20 can move in the hole of the wire frame 10 without being blocked by air.

In order to drive the movable iron core 20 to reciprocate in the mounting hole 11, the electromagnetic assembly 40 is mounted on the wire frame 10, and the electromagnetic assembly 40 comprises a static iron core 41 which is used for contacting with the movable iron core 20 to form a magnetic loop, a coil 42 wound on the periphery of the wire frame 10, and a U-shaped yoke 43 sleeved at the bottom of the wire frame 10; an elastic member 44 is provided between the movable core 20 and the stationary core 41. A coil pin 13 for connecting a coil is mounted on the top of the bobbin 10. The coil pin 13 is connected with a power supply to electrify the coil 42. Set up the first mounting groove 21 of holding elastic component 44 in the bottom of movable iron core 20, the second mounting groove of holding elastic component 44 is seted up to the top surface of quiet iron core 41, and elastic component 44 both ends are arranged in first mounting groove and 21 second mounting groove, realize restoring to the throne movable iron core 20 through elastic component 44, and elastic component 44 can be the spring.

Further, when an effective voltage or current pulse is applied to the two ends of the coil pin 13, the coil 42 generates a magnetic flux, and the magnetic flux passes through a magnetic circuit formed by the stationary iron core 41, the U-shaped yoke 43, the flat plate yoke 30, the movable iron core 20 and the air gap, and under the action of the coil magnetic field, the movable iron core 20 overcomes the counter force of the elastic element and the air gap to be closed with the stationary iron core 41, so that kinetic energy is generated for the movement of the movable iron core 20 of the contactor.

In order to fix the stationary iron core 41, a fixing block 411 is arranged at the bottom of the stationary iron core 41, a limiting hole 431 for fixing the fixing block 411 is formed in the U-shaped yoke 43, and the stationary iron core 41 and the U-shaped yoke 43 are fixedly connected by fixing the fixing block 411 in the limiting hole 431.

In summary, in the scheme of the utility model, the flat yoke is fixed on the wire frame with the mounting hole, the through hole is formed in the flat yoke, the movable iron core penetrates through the flat yoke and can be movably arranged in the mounting hole in a penetrating manner, the positioning structure for limiting the movable iron core is formed on the inner side wall of the mounting hole, when the movable iron core moves back and forth along the axial direction in the mounting hole, the radial direction of the movable iron core is limited through the positioning structure, so that a certain distance gap is kept between the movable iron core and the inner side wall of the through hole of the flat yoke, the side attraction phenomenon caused by a magnetic closed loop due to the contact between the movable iron core and the flat yoke in the moving process is avoided, the small gap between the movable iron core and the flat yoke is ensured but not contacted with each other by controlling the size of the positioning structure, the interference of the movable iron core due to the deformation of the inner hole of the wire frame is avoided, and the purpose of ensuring the large magnetic force is achieved.

The above-described embodiments do not limit the scope of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the above-described embodiments should be included in the protection scope of the technical solution.

Claims

1. The utility model provides a contactor prevents magnetic circuit positioning mechanism of side suction which characterized in that: the iron core comprises a wire frame (10) with a mounting hole (11) formed in the center in a penetrating manner, a flat plate yoke (30) fixed on the end face of the wire frame (10), and a movable iron core (20) movably penetrating through the flat plate yoke (30) and the mounting hole (11); a positioning structure (12) used for limiting the movable iron core (20) is formed on the inner side wall of the mounting hole (11); the positioning structure (12) limits the movable iron core (20) to enable the flat plate yoke (30) and the movable iron core (20) to keep a distance.

2. The contactor side-suck prevention magnetic circuit positioning mechanism as claimed in claim 1, wherein: the positioning structure (12) comprises a plurality of semi-cylinders extending along the axial direction of the mounting hole (11), and the semi-cylinders are annularly distributed on the inner side wall of the mounting hole (11).

3. The contactor side-suck prevention magnetic circuit positioning mechanism as claimed in claim 2, wherein: the electromagnetic assembly (40) is arranged on the wire frame (10), and the electromagnetic assembly (40) comprises a static iron core (41) fixedly arranged in the mounting hole (11), a coil (42) wound on the periphery of the wire frame (10), and a U-shaped yoke (43) sleeved at the bottom of the wire frame (10); the static iron core (41) is fixed on the U-shaped yoke (43), and an elastic piece (44) is arranged between the movable iron core (20) and the static iron core (41).

4. The contactor side-suck prevention magnetic circuit positioning mechanism as claimed in claim 3, wherein: the bottom of the movable iron core (20) is provided with a first mounting groove (21) for accommodating the elastic piece (44); and a second mounting groove for accommodating the elastic piece (44) is formed in the top surface of the static iron core (41).

5. The contactor side-suck prevention magnetic circuit positioning mechanism as claimed in claim 3, wherein: and a coil pin (13) connected with the coil is arranged at the top of the coil holder (10).

6. The contactor side-suck prevention magnetic circuit positioning mechanism as claimed in claim 1, wherein: the flat plate yoke (30) is provided with a through hole (31) for the movable iron core (20) to pass through; the positioning structure (12) limits the movable iron core (20) to enable the movable iron core (20) and the inner side wall of the through hole (31) to keep a distance.

7. The contactor side-suck prevention magnetic circuit positioning mechanism as claimed in claim 3, wherein: the bottom of the static iron core (41) is provided with a fixed block (411), and the U-shaped yoke (43) is provided with a limiting hole (431) for fixing the fixed block (411).