JPH0794068A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To easily reduce noise. CONSTITUTION:In an electromagnetic relay having an iron core 51; a coil wound on the iron core 51 and covered with a resin mold 11; an armature 21 attracted to and released from the magnetic pole surface 51a of the iron core 51; and a contact spring 22 for opening and closing a contact reactively with the armature 21, the magnetic pole surface 51a of the iron core 51 is covered with the mold 11. The magnetic pole surface 51a of the iron core 51 is also covered by the resin mold 11 covering the coil, the surface which the metal armature 21 is attracted to and collided with can be made of resin without providing a new member, and the collision sound can be also minimized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay in which a coil is covered with a resin molding.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic relay of this type, FIG.
There is a configuration shown in. This one has an iron core A,
A coil (not shown) wound around the iron core A and covered with a molded body B made of resin, an armature C that is suction-released to the magnetic pole surface A ₁ of the iron core A, and an armature C that responds to the armature C. And a contact spring D for opening and closing the contact. Here, the magnetic pole surface A ₁ of the iron core A is exposed from the molded body B.

[0003]

In the above-described conventional electromagnetic relay, the coil is covered with the resin molded body B, so that the insulation distance between the input side coil and the output side contact spring D is increased. Can be reliably secured, and since the magnetic pole surface A ₁ of the iron core A is exposed from the molded body B, the magnetic pole surface A ₁
The attraction force when the armature C is attracted to is strong.

However, since the armature C directly collides with the magnetic pole surface A ₁ , a large collision noise is generated due to the collision of metal members, which is a problem when it is used in applications such as crime prevention equipment where noise reduction is required. May be.

For this reason, within a range in which the suction force against the spring load has a margin, the suction speed of the armature C is reduced by means such as attaching a cushioning member to the magnetic pole surface A ₁ of the iron core A to reduce the collision noise. Although it is possible to reduce the size, a new member such as a buffer member is required, and the assembling work becomes troublesome, which causes a cost increase.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an electromagnetic relay capable of easily reducing noise.

[0007]

In order to solve the above problems, an electromagnetic relay of the present invention comprises an iron core, a coil wound around the iron core and covered with a molded body made of resin, and an iron core. In an electromagnetic relay including an armature that is attracted and released to a magnetic pole surface of a core and a contact spring that opens and closes a contact in response to the armature, the magnetic pole surface of the iron core is covered with the molded body. It is configured.

[0008]

According to the electromagnetic relay of the present invention, the magnetic pole surface of the iron core is also covered by using the resin molded body that covers the coil.
The surface on which the metal armature is attracted and collides can be made of resin without attaching a new member, thus,
The collision noise is also reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. It consists of a body block 1, an armature block 2 and a cover 3.

The body block 1 includes a terminal block 4, a coil block 5 and a permanent magnet 6 which is a molded body 11 made of synthetic resin.
It is integrally molded by molding with.

As shown in FIG. 2 (a), the terminal block 4 has a plurality of contact terminals 41 on the upper side and three coil terminals 42 on the lower side punched out from the hoop material 44 to form a plurality of them in the lateral direction. A pair of contacts are formed at the same time, and fixed contacts 43 are fixed to one ends of the contact terminals 41 on both sides.

As shown in FIG. 2B, the coil block 5 has a coil bobbin 52 made of synthetic resin formed from the central piece of the substantially U-shaped iron core 51 to the bases of both side pieces, and the coil bobbin 52 is coiled. 53 is wound. Here, one surface of each of the both side pieces of the iron core 51 exposed from the coil bobbin 52 serves as magnetic pole surfaces 51a, 51a to which the armature 21, which will be described later, is sucked and released. Then, the coil bobbin 52 is formed with winding body portions on both left and right sides,
The coil 53 is wound around each winding body in a reverse winding manner, and the coil bobbin 52 has a connecting pin 54 connecting the ends of the coil 53 and a fixing piece 55 integrally connected to the connecting pins 54 at the left and right ends. And are planted.

The permanent magnet 6 is formed into a flat plate by magnetizing both ends to the same pole and the central part to different poles. As shown in FIG. 2 (b), both sides of the iron core 51 of the coil block 5 are formed. It is fixed by welding between the pieces.

The coil block 5 to which the permanent magnet 6 is fixed is placed on the terminal block 4 as shown in FIG. 2 (c), and the fixing pieces projecting from both ends of the coil bobbin 52 are provided.
55 is welded and connected to one end of the coil terminals 42 on the left and right sides, and the central connecting pin 54 is connected to the central coil terminal 42.
It is welded to and connected to the substantially square-shaped portion that is the base end portion of, and is integrated with the terminal block 4.

The block in the state shown in FIG. 2 (c) has the molded body 11 except for the fixed contact 43 and the terminals 41, 42.
Then, the terminals 41 and 42 are bent along the outer surface of the molded body 11 after the connecting portions are appropriately cut to form the body block 1 shown in FIG.

At this time, the coil block 5 has the coil 53
Of course, the iron core 51 is also a completely molded body as shown by the broken line.
It is covered with 11, especially the pole faces 51a, 51a on both sides of it.
Is covered with the thin-walled molded body 11 in a range where the attraction force of the armature 21 described later has a margin against the spring load.

The armature block 2 comprises an armature 21 and a contact spring 22. The armature 21 is formed in a flat plate shape by projecting a substantially semicircular convex shaft portion 24 from the center of both side surfaces, and the shaft portion 24 is provided in the molded body 11 of the body block 1 in a substantially semicircular concave shape. Is rotatably supported by the bearing portion 11a.

The contact spring 22 is formed of a leaf spring material such as phosphor bronze by providing twin spring pieces 25, 25 on both sides in the longitudinal direction. The spring pieces 25, 25 are provided with movable contacts 23 at their tips, respectively. At the same time, a spring supporting piece 26 is provided on one side of the central portion. The contact spring 22 is fixed to one surface of the armature 21 at the central portion.

The armature block 2 is constructed such that the contact spring 22 is provided on the base 41a of the central contact terminal 41 exposed from the molded body 11.
It is attached to the body block 1 by welding and connecting the supporting pieces 26 of.

Then, a cover 3 formed in a substantially box shape with a molding material such as synthetic resin is fitted to the body block 1.

Next, the operation will be described. When the coil 53 is energized, one end of the armature 21 has an iron core depending on the direction of magnetization.
It is attracted to one of the magnetic pole surfaces 51a, 51a on both ends of 51 and swings around the central shafts 24, 24 as a fulcrum, and even if the coil 53 is de-energized, the holding and attractive force of the permanent magnet 6 against the spring load. Since it is covered with the thin-walled molded body 11 in a marginal area,
When the attracted state is maintained and the direction of energization of the coil 53 is reversed, the armature 21 similarly reversely oscillates and returns to the original state. Thus, this polarized relay
The armature 21 is a so-called balanced armature type, which is capable of swinging about the central portion as a fulcrum, and performs a bistable operation. Get close to 43.

In such an electromagnetic relay, since the body block 1 is integrally molded by covering the coil 53 with the resin molded body 11, the coil 53 on the input side is insulated from the contact spring 22 on the output side. The distance can be reliably ensured, and since the magnetic pole surface 51a of the iron core 51 is also covered by using the molded body 11, the metal armature 21 can be attracted without attaching a new member. The collision surface can be made of resin, so that the collision noise is also reduced.

[0023]

In the electromagnetic relay of the present invention, the magnetic pole surface of the iron core is also covered by using the resin molded body that covers the coil.
The surface on which the metal armature is attracted and collides can be made of resin without attaching a new member, thus,
The collision noise is also reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is an explanatory view showing a manufacturing process up to the body block of the above.

FIG. 3 is an exploded perspective view showing a conventional example.

[Explanation of symbols]

 11 Molded body 21 Armature 22 Contact spring 51 Iron core 51a Magnetic pole surface 53 Coil

Claims (1)

[Claims] 1. An iron core, a coil wound around the iron core and covered with a molded body made of resin, an armature sucked and released to the magnetic pole surface of the iron core, and a contact responding to the armature. An electromagnetic relay comprising: a contact spring that opens and closes, wherein the magnetic pole surface of the iron core is covered with the molded body.