CN111564339B - Arc-extinguishing structure under the bottom plate of small sealed electromagnetic relay - Google Patents

Abstract

The utility model relates to an arc-extinguishing structure under the bottom plate of a small sealed electromagnetic relay, which belongs to the technical field of electromagnetic relays. The bottom-mounted arc extinguishing structure of the small sealed electromagnetic relay of the present invention includes a permanent magnet and a contact spring group; the contact spring group is vertically arranged on the upper surface of the bottom plate of the electromagnetic relay; one end of the upper surface of the bottom plate is provided with a long slot, and the permanent magnet is embedded in the long groove. The groove is fixed by glue, and the upper surface of the permanent magnet is flush with the upper surface of the base plate, the contact spring group is arranged on the upper surface of the permanent magnet, the permanent magnetic field of the permanent magnet is perpendicular to the contact gap of the contact spring group, and the sheet of the contact spring group The extension direction of the like end is the same or opposite. The invention enables the arc generated between the contacts of the electromagnetic relay to be elongated under the action of the magnetic field so as to be quickly extinguished, thereby reducing the damage to the contact surface caused by the arc ablation, and at the same time facilitating the rapid diffusion of the arc heat and reducing the heat generated by the continuous arc. Influence on electromagnetic system, improve relay life and overload resistance.

Description

Arc-extinguishing structure under the bottom plate of small sealed electromagnetic relay

technical field

The invention belongs to the technical field of electromagnetic relays, and in particular relates to a bottom-mounted arc extinguishing structure of a small sealed electromagnetic relay.

Background technique

Small sealed electromagnetic relays are widely used in aviation, aerospace, communications and other fields, and play a key role in signal transmission, circuit switching, etc. In small sealed electromagnetic relays, contact bonding is the most common fault form. Due to the small internal space of the relay and the difficulty in setting up the arc extinguishing device, the contact system will produce severe damage during operation, especially in the state of heavy overload and frequent on-off. The arc is easy to cause contact ablation or even fusion welding, resulting in poor contact reliability of the contact. At the same time, the heat flow generated by the continuous arcing causes a higher temperature in the contact area, and a large amount of heat will spread to other components along with the arc spray, which will degrade the performance of the electromagnetic system, affect the performance of the relay's pull-in and release, and accelerate the life loss of the relay.

The invention patent application with publication number CN109950095A discloses "an arc extinguishing structure for relays and its manufacturing method". The permanent magnet arc extinguishing structure described in this invention application can be implemented below the structure.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a small-sized sealed electromagnetic relay bottom-mounted arc-extinguishing structure. Through the bottom-mounted arc-extinguishing structure design, the influence of arcing on the performance of the contact system of the electromagnetic relay can be effectively reduced, and the on-load operation capability of the electromagnetic relay can be improved. and service life.

The arc-extinguishing structure of the small sealed electromagnetic relay bottom plate of the invention is provided with a long groove on the bottom plate of the electromagnetic relay, and the permanent magnet is fixed in the long groove and is located under the contact spring group, and the permanent magnet adopts the strong magnetic NdFeB. It is magnetized and stabilized before being installed in the long slot, so that the permanent magnetic field generated is perpendicular to the contact gap; this structure design realizes effective arc extinguishing in a small space of a small sealed electromagnetic relay The magnetic field generated by the magnet causes the arc generated between the contacts to be elongated under the action of the Lorentz force until it is extinguished. Compared with the prior art, the arc-extinguishing structure of the small sealed electromagnetic relay base plate of the present invention can realize the magnetic field arc-extinguishing in a narrow space, quickly eliminate the arc generated when the reed moves, and reduce the ablation of the arc to the contact surface. At the same time, it reduces the heat released by continuous arcing, reduces the damage to the electromagnetic system caused by the heat during the operation of the relay, and improves the life and overload resistance of the relay.

In order to solve the above-mentioned technical problem, the technical scheme that the present invention takes is:

The arc-extinguishing structure under the bottom plate of a small sealed electromagnetic relay includes a permanent magnet and a contact spring group; the contact spring group is vertically arranged on the upper surface of the bottom plate of the electromagnetic relay; one end of the upper surface of the bottom plate is provided with a long groove, and the permanent magnet is embedded in The long groove is fixed by glue, and the upper surface of the permanent magnet is flush with the upper surface of the bottom plate. The contact spring group is arranged on the upper surface of the permanent magnet. The permanent magnetic field of the permanent magnet is perpendicular to the contact gap of the contact spring group. The sheet-like ends extend in the same or opposite directions.

The beneficial effects of the present invention relative to the prior art are:

The arc-extinguishing structure under the bottom plate of the small sealed electromagnetic relay of the invention can set the permanent magnet arc-extinguishing structure on the premise of not compressing the design space of the contact spring group, and can quickly eliminate the moving reed and the dynamic closing and static spring in the breaking process The arc generated during the action of the chip reduces the ablation of the contact surface by the arc, and at the same time reduces the heat released by the arc, reduces the damage to the electromagnetic system caused by the heat during the operation of the electromagnetic relay, and improves the service life and overload resistance of the electromagnetic relay. The endurance performance of the original electromagnetic relay design is maintained to the greatest extent.

In the present invention, since the permanent magnets are embedded in the bottom plate, all the reed-shaped ends extend inwards or outwards without affecting the installation of the arc-extinguishing permanent magnet. There is a big difference in magnetic placement.

Description of drawings

1 is a schematic diagram of a bottom-mounted arc extinguishing structure of a small-sized sealed electromagnetic relay of the present invention;

Fig. 2 is a schematic diagram of bottom plate slotting;

FIG. 3 is a schematic diagram of arc blowing of the arc-extinguishing structure under the bottom plate of the small sealed electromagnetic relay of the present invention.

The names and labels of the components involved in the above drawings are as follows:

Static reed a, dynamic combined static reed b, permanent magnet c, bottom plate d, dynamic reed e.

Detailed ways

Embodiment 1: As shown in FIG. 1 and FIG. 2 , this embodiment discloses a bottom-mounted arc-extinguishing structure of a small sealed electromagnetic relay, including a permanent magnet c and a contact spring group; the contact spring group is vertically arranged on the bottom of the electromagnetic relay. On the upper surface of the bottom plate d, the curled end of the contact spring group is welded and fixed on the lead-out rod, and the lead-out rod and the glass insulator are sintered and fixed on the bottom plate d; one end of the upper surface of the bottom plate d is provided with a long groove, and the permanent magnet c It is embedded in the long slot and fixed by gluing (the permanent magnet c needs to be magnetized and stabilized before being embedded in the long slot), and the upper surface of the permanent magnet c is flush with the upper surface of the bottom plate d (so that the permanent magnet c can be stably fixed The contact spring group is arranged on the upper surface of the permanent magnet c, the permanent magnetic field of the permanent magnet c is perpendicular to the contact gap of the contact spring group, and the extension direction of the sheet end of the contact spring group the same or the opposite.

Further, as shown in Figure 1 and Figure 3, the permanent magnet c is a cuboid, and is made of NdFeB material (to ensure that a larger magnetic field is generated at the arc generation place with a smaller volume, which can avoid permanent magnets. Demagnetization occurs at high temperatures generated by the arc).

Further, as shown in FIG. 1 and FIG. 3 , the side edges of the permanent magnet c are rounded (to facilitate the installation of the permanent magnet c).

Further, as shown in FIG. 1 and FIG. 3 , the contact spring group includes a static reed a, a dynamic combined static reed b and a dynamic reed e; the static reed a, the dynamic combined static reed b and The moving reeds e are all arranged vertically, the static reeds a and the dynamic and static reeds b extend in opposite directions and are both arranged on the upper surface of the permanent magnet c. There is a gap between the ends, the moving reed e is arranged between the static reed a and the dynamic and static reed b, and the permanent magnetic field of the permanent magnet c is perpendicular to the gap between the static reed a and the dynamic and static reed b. Gap (ie contact gap).

As shown in Figure 3, when the arc blows, when the moving reed e and the static reed a are separated, or when the moving reed e is separated from the dynamic and static reed b, under the condition of load, an arc will be generated between them, and the arc will It is perpendicular to the magnetic field generated by the permanent magnet c embedded in the long slot of the bottom plate, so the arc will be elongated under the action of the Lorentz force until it is extinguished.

The specific steps of the design method of the bottom-mounted arc-extinguishing structure of the small sealed electromagnetic relay of the present invention are as follows:

Step 1: Make the permanent magnet c. The overall shape is a cuboid, and the side edges are rounded, which is convenient for the installation of the permanent magnet c. The specific size depends on the space of the electromagnetic relay to ensure that the installation of the permanent magnet c will not affect the moving reed e and the moving The action of the static reed b, the permanent magnet c is made of NdFeB as the material, and magnetized and stabilized;

Step 2: adopt a thickened base plate d whose thickness is 1.5 times the thickness of the conventional base plate to facilitate the installation of the permanent magnet c on the base plate d and ensure the mechanical properties of the base plate d; the thickness of the conventional base plate is usually 1.5mm;

Step 3: open a long slot on the upper surface of the bottom plate d, the long slot is located directly below the contact spring group, and the size of the long slot matches the size of the permanent magnet c; the permanent magnet c is embedded in the long slot on the bottom plate d, and the AB glue is fixed to ensure that the direction of the magnetic field generated by the permanent magnet c in the air gap area is perpendicular to the contact gap;

Step 4: Install the contact spring group, including the static reed a, the dynamic combined static reed b and the moving reed e, and the curled ends of the static reed a, the dynamic combined static reed b and the moving reed e are welded and fixed on the On the corresponding lead-out rod, the lead-out rod and the glass insulator are sintered and fixed on the bottom plate d together; the above-mentioned three reeds are vertically arranged on the bottom plate d and the upper surface of the permanent magnet c;

Step 5: Assemble other components of the electromagnetic relay.

The above description is only illustrative and not restrictive to the present invention, and it is understood by those of ordinary skill in the art that many modifications, changes or Equivalent, but will fall within the protection scope of the present invention.

Claims (2)

1. An arc extinguishing structure with a bottom plate underneath for a small sealed electromagnetic relay comprises a permanent magnet (c) and a contact spring group; the contact spring group is vertically arranged on the upper surface of a bottom plate (d) of the electromagnetic relay; the method is characterized in that: an elongated slot is formed in one end of the upper surface of the bottom plate (d), the permanent magnet (c) is embedded into the elongated slot and fixed by glue joint, the upper surface of the permanent magnet (c) is flush with the upper surface of the bottom plate (d), the contact spring group is arranged on the upper surface of the permanent magnet (c), the permanent magnetic field of the permanent magnet (c) is perpendicular to the contact gap of the contact spring group, and the extension directions of the sheet ends of the contact spring group are opposite;

the permanent magnet (c) is a cuboid and is made of a neodymium iron boron material; the contact spring group comprises a static spring piece (a), a movable static spring piece (b) and a movable spring piece (e); the permanent magnetic field of the permanent magnet (c) is perpendicular to the gap between the static reed (a) and the movable static reed (b).

2. The under-chassis type arc extinguishing structure for the small-sized sealed electromagnetic relay according to claim 1, wherein: the side edges of the permanent magnets (c) are provided with rounding.

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