JPH03210723A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To lengthen the insulation length and improve withstand voltage property by parting a fixed contact and a movable contact from an electromagnetic block and a movable core with an insulating frame body. CONSTITUTION:An electromagnetic block 20 whose pole is exposed to the almost center part of a base 10, a movable core 30 which is supported freely rotatably, and a movable contact block 50 unitedly formed with an insulating stand in which a movable contact is inserted are installed. Further, an insulating frame body 40 is installed between the movable core 30 and fixed contacts 11a, 12a, 13a, 14a to separate from the block 50 and the movable core 30. The frame body 40 is made like a box so as to cover the core 30 and insertion holes 41, 42 into which supporting poles 14b, 15b of the base 10 can be inserted are formed in both end parts. Consequently, since the movable contact 52a, 52b are put in more projected position than end parts 32a, 32b of the core 30, the contact gap becomes large.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electromagnetic relay, and particularly to an electromagnetic relay having high withstand voltage characteristics.

(Prior Art and Problems to be Solved by the Invention) Conventionally, as an electromagnetic relay, there is one described in, for example, Japanese Unexamined Patent Publication No. 197932 (FIG. 7).

That is, fixed contacts 2゜2 (the fixed contacts on the near side are not shown) are arranged at the four corners of a box-shaped base 1, and an electromagnet block 3 is housed inside this box-shaped base 1, and this electromagnet By energizing and demagnetizing the block 3, the movable iron piece 4 rotates using the upper end surface of the permanent magnet 3a located in the center of the electromagnetic block 3 as a fulcrum, and is integrally attached to both sides of the movable iron piece 4 via an insulating stand 4a. The movable contacts 6.6 of the movable contact piece 5 which have been changed into contact with and away from the fixed contact 2.2 alternately. In addition,
7 is a case.

However, in the conventional example described above, since the fixed contact 2 is arranged near the electromagnetic block 3, the insulation distance is short and it is difficult to obtain high withstand voltage characteristics. For this reason, the electromagnetic block 3 and the fixed contact 2. Although it is possible to partition the movable contact 6 and the movable contact piece 5 by providing an insulator between them, since the movable iron piece 4 and the movable contact piece 5 are located on approximately the same plane, it is not possible to provide an insulator. However, there was a problem in that it was difficult to ensure high withstand voltage characteristics.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide an electromagnetic relay having high withstand voltage characteristics.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention includes a base in which a fixed contact is exposed upward from near the edge of the upper surface; An electromagnet block with a magnetic pole exposed in the center, a movable iron piece whose bottom surface is rotatably supported by the magnetic pole of the electromagnet block, and a movable contact piece inserted into the center of the top surface of this movable iron piece. An electromagnetic relay consisting of a movable contact piece block that integrates a molded insulating base, and which rotates the movable contact piece block to open and close contacts together with the movable iron piece that rotates based on the excitation and demagnetization of the electromagnetic block. An insulating frame having a shape that partitions the movable contact piece and the fixed contact from the electromagnet block and the movable iron piece is integrally provided between the movable iron piece and the movable contact piece block. be.

(Operation and Effects of the Invention) Therefore, according to the present invention, the fixed contact and the movable contact piece are separated from the electromagnet block and the movable iron piece by the insulating frame.

Therefore, the insulation distance becomes longer, the withstand voltage characteristics are improved, and
This has the effect of providing an electromagnetic relay with high withstand voltage characteristics.

(Embodiment) An embodiment of the present invention will be described below with reference to the accompanying drawings of FIGS. 1 to 6.

The electromagnetic relay according to this embodiment generally includes a base 10, an electromagnetic block 20, a movable iron piece 30, an insulating frame 40, a movable contact piece block 50, and a case 60.

The base IO has a substantially rectangular planar shape, and has fixed contact terminals 11, 12 and common contact terminals 13 (Fig. 1, the contact terminals on the back side are not shown) each symmetrically insert-molded as a pair. Then, there is a support column 14a, 1 near the tightening part on the short side.
4b, 14b, 14a and 15a, 15b,
15b, 15a, and the support portion 14a.

Positioning support columns 16 and 16 are provided in a protruding manner at intermediate positions of 15a.

The upper end portion of the fixed contact terminal 11 is a support portion 14a.
The fixed contact terminal 12 is electrically connected to a fixed contact 11a provided on the upper end surface via a lead frame (not shown), and the upper end of the fixed contact terminal 12 is connected to a fixed contact 12a provided on the upper end surface of the support 15a.
It is electrically connected to the terminal via a lead frame (not shown). Furthermore, the upper end of the common contact terminal 13 is divided into two parts,
One side is connected to the support column 14b via a lead frame (not shown).
The other is electrically connected to a fixed contact 13a provided on the upper end surface, and the other is electrically connected to a fixed contact 13b provided on the upper end surface of the support column 15b. Further, a press-fit hole 16a is provided in the upper end surface of the support portion 16.16, and the support portion 16 and the support portion 1
An insulating wall 17 is provided between 4a and 15a.

Note that 18a is a coil terminal hole, and 18b is a gas vent hole.

The electromagnet block 20 has a permanent magnet 22 disposed on an iron core 21 having a U-shaped cross section to form an E-shaped cross section.
The magnetic pole part 22a of the permanent magnet 22 is exposed from the upper surface of the central flange 23a of the spool 23, while the left magnetic pole part 21a of the iron core 21 is inserted from the upper surface of the flange 23b of the spool 23. In addition, the right magnetic pole portion 21b of the iron core 21 is exposed from the upper surface of the flange portion 23c of the spool 23. Further, the flange portion 2
Frame portions 24a and 24b are integrally molded on the outer surfaces of 3b and 23c, respectively, and coil terminals 25 and 25 are insert-molded in these frame portions 24a and 24b, respectively.

The lead wires of the coil 26 wound around the spool 23 are tied to the tangled portions 25a of the coil terminal 25 on the left side in FIG. 1 and soldered.

Although the plate thickness of the iron core 21 is constant, the left magnetic pole part 21a is wider than the right magnetic pole part 21b and has a larger attraction area, so that the left and right magnetic forces are unbalanced. In addition, in FIG. 1, the coil terminal 25 on the right side is shorter than the coil terminal 25 on the left side, and the coil terminal hole 18 is shorter than the coil terminal 25 on the left side.
The length is such that it does not protrude from the back surface of the base IO even if it is inserted into a.

Then, when the electromagnet block 20 is positioned above the base 10 and the coil terminal 25 is press-fitted into the coil terminal hole 18a and temporarily fixed, the columns 14b, 14b and 15b, 15b protrude from the frame parts 24a and 24b, respectively.

The movable iron piece 30 is approximately rectangular in plan, with a protrusion 31 protruding from the center of the lower surface that serves as a pivot point, and both ends 3
The lower surfaces of 2a and 32b are tapered surfaces. Furthermore, the movable iron piece 3o has a total of four caulking holes 33, two each facing each other with the protrusion 31 in between.

The insulating frame 40 has a box shape that can cover the movable iron piece 30, and has support portions 14b of the base 1° at both ends.
, 15b are formed with loosely fitting holes 41 and 42, respectively, and a caulking hole 43 is provided at a position corresponding to the caulking hole 33 of the movable iron piece 30. In addition, the insulating frame 40
The notch steps 44 and 44 are provided at the center of both sides.

The movable contact piece block 50 has a plane approximately U on the front and back of the insulating table 51.
It is made by insert molding a total of four movable contact pieces 52 and 53, two each, and integrating them (Fig. 2).
A caulking projection (not shown) that can be inserted into the caulking hole 43 of the insulating frame 40 and the caulking hole 33 of the movable iron piece 30 protrudes from the center of the lower surface of the insulating stand 51, and also protrudes from both sides of the lower surface. A tongue piece 51a (the tongue piece on the back side is not shown) is provided to protrude downward from the portion. And this tongue piece 51
A hinge spring 5454 in the shape of a plane protrudes laterally from the outer surface of a. The free end of the hinge spring 54 is bent vertically downward.

The movable contact piece 52 has both ends thereof divided into two parts in the middle direction,
A movable contact 52a is provided on the lower surface of one end, and a movable contact 52b is provided on the lower surface of the other end. Further, the movable contact piece 53 also has movable contacts 53a and 5 like the movable contact piece 52.
3b is provided on the lower surface of each end.

Then, the tongue piece 51a of the insulating stand 51 is fitted into the notch step 44 of the insulating frame 40, and the caulking protrusion (not shown) provided on the insulating stand 51 is inserted into the caulking hole 44 of the insulating frame 40.
The movable iron piece 30, the insulating frame 40, and the movable contact piece block 50 are integrated by inserting the movable iron piece 30 into the caulking hole 33 and thermally caulking the protruding tip.

Next, this is positioned above the base 10, and the tip of the bent hinge spring 54 is inserted into the press-fit hole of the support I6.
6a and fixed, the protrusion 31 of the movable iron piece 30 comes into contact with the magnetic pole part 22a of the permanent magnet 22, the movable iron piece 30 is rotatably supported, and the movable contact 52a,
52b, 53a, 53b are fixed contacts 11a, 13a
and 12a and 13b so as to be able to come into contact with and separate from each other.

When the assembly is completed in this way (FIG. 3), the magnetic pole surface of the permanent magnet 22, the protrusion 31 of the movable iron piece 30, and the hinge spring 54 are located on almost the same plane.
No extra bending moment is applied, and smooth operation can be achieved.

Further, according to this embodiment, the movable contacts 52a, 52b and 53a are
53b is in the protruding position, the movable contact piece 52.5
3 has a long turning radius. Therefore, even if the rotation angle of the movable iron piece 30 is small, the contacts can be opened and closed. As a result, there are advantages in that an electromagnetic relay with high sensitivity, low power consumption, and a large contact gap can be obtained.

The case 60 has a substantially box shape that can be fitted to the base 1O, and a sealing agent 7 is inserted into the recess formed by fitting the case 60 to the base 1O.
After injecting and solidifying 0, the gas vent hole 18b of the base 10
The assembly work is completed by venting the internal gas and sealing the gas vent hole tab by heat melting.

Next, the operation of the electromagnetic relay configured as described above will be explained.

In the case of non-excitation, the magnetic flux of the permanent magnet 22 (indicated by the dotted line in FIG. 4) causes the left end 32a of the movable iron piece 30 to
It is attracted to the left magnetic pole part 21a of No. 1 and closes a magnetic circuit. Therefore, the movable contacts 52a, 52 of the movable contact piece 52
b is in contact with the fixed contacts 11a, 13a, while the movable contacts 53a, 53b are separated from the fixed contacts 12a, 13b.

Next, as shown in FIG. 5, when the coil 26 is excited by applying a voltage so as to generate a magnetic flux (indicated by a dashed line) that cancels out the magnetic flux, the right end 32b of the movable iron piece 3o
1, the permanent magnet 22
The movable iron piece 30 rotates about the protrusion 31 as a fulcrum against the magnetic force of 32b is attracted to the right magnetic pole part 21b of the iron core 21 (the sixth
figure). Therefore, the movable contact 52a of the movable contact piece 52.

After 52b is separated from the fixed contacts 11a, 13a, the movable contacts 53a, 53b come into contact with the fixed contacts 12a, 13b.

Then, when the direct distribution coil 26 is de-energized, the movable contact piece 5
Due to the return force based on the spring force of 3.53 and the spring force of the hinge spring 54, and because the attraction area of the left magnetic pole part 21a of the iron core 21 is wider than that of the right magnetic pole part 21b, the movable iron piece 30 is returned to its original position. The movable contacts 52g, 52b and 53a, 53b switch to return to their original state.

According to this embodiment, the movable contact pieces 52 and 53 have a substantially U-shaped planar shape and are of a so-called double break type, so that, for example, the contact between the fixed contact 52b and the movable contact 11a is different from the so-called single break type. Half the distance between contacts is fine. Therefore, there is an advantage that the height of the electromagnetic relay can be saved and the device can be made smaller.

In this embodiment, a self-returning type has been described, but this is not necessarily the case. By adjusting the shape of the iron core 21, the spring force of the movable contact pieces 52, 53, etc., a self-retaining type can also be used. good.

[Brief explanation of drawings]

1 and 6 show an embodiment of the electromagnetic relay according to the present invention, in which FIG. 1 is an exploded perspective view, FIG. 2 is a plan sectional view, FIG. 3 is a front sectional view, and FIGS. FIG. 6 is an explanatory diagram for explaining the operation of the movable iron piece, and FIG. 7 is an exploded perspective view showing an example of a conventional electromagnetic relay. 10-...Base, 11a, 12m, 13a, l
3b-Fixed contact, 20... Electromagnetic block, 22
a, - Magnetic pole part, 30... Movable iron piece, 4o... Insulating frame, 5o... Movable contact piece block, 51... Insulating stand, 52.53... Movable contact piece, 52a, 52b , 53
a, 53b - movable contact; Patent applicant: Omron Co., Ltd. Agent Patent attorney: Aohaku (1 person) Figure 4

Claims (1)

[Claims] (1) A base with a fixed contact exposed upward from near the edge of the top surface, an electromagnetic block placed and positioned approximately at the center of the top surface of this base, and having a magnetic pole portion exposed approximately at the center of the top surface, and this electromagnet block. It consists of a movable iron piece whose lower surface approximately at the center is rotatably supported by the magnetic pole part of the movable iron piece, and a movable contact piece block which is integrated with an insulating base on which a movable contact piece is insert-molded at the upper center of the movable iron piece. In an electromagnetic relay that rotates the movable contact piece block together with the movable iron piece that rotates based on excitation and demagnetization of the electromagnetic block to open and close contacts, between the movable iron piece and the movable contact piece block, An electromagnetic relay characterized in that an insulating frame body having a shape that partitions the movable contact piece and the fixed contact from the electromagnet block and the movable iron piece is integrally provided.