JPH03280319A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To elongate insulating distance, so as to obtain desired level of insulating characteristic, while reducing weight by insert-molding a fixed contact terminal on a strut part. CONSTITUTION:An electromagnetic relay is composed of a base 10, an electromagnet block 20, a moving iron piece 30, an insulating frame 40, a moving contact piece block 50, and of a case 60. Fixed contact terminals 11, 12 and a common contact terminal 13 are molded in the vicinity of the edge in the shorter side of the base 10, and strut parts 14a, 14b, and 15a, 15b, as well as a strut part 16 for positioning, are provided. The upper end of the fixed contact terminal 11 is electrically connected to a fixed contact 11a provided on the upper end surface of the strut part 14a through a lead frame, while the upper end of the fixed contact terminal 12 is electrically connected to a fixed contact 12a provided on the upper end surface of the strut part 15a through the lead frame. The outer side surfaces of the fixed contact terminals 11, 12 are coated by being insert-molded in the strut parts 14a, 15a, and only the fixed contacts 11a, 12a are exposed thereby, while the fixed contacts 11a, 12a and moving contact pieces 52, 53 are partitioned from the electromagnet block 20 and the moving iron piece 30 by the insulating frame 40, and spatial distance is thus elongated.

Description

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

(Prior Art and Problems to be Solved by the Invention) Conventionally, as an electromagnetic relay, for example, as shown in FIGS. 10 and 1t, an electromagnetic block l formed by winding a coil tb around an iron core 1a, A movable iron piece 4 in a dogleg shape is erected on the upper surface of the base 3 via a dogleg shaped yoke 2, and is rotatably supported on the upper end of the yoke 2 based on the excitation and demagnetization of the electromagnetic block 1. By rotating the movable contact piece 6 against the spring force of the coil spring 5 and driving the movable contact piece 6, the movable contact 6a provided at the free end of the movable contact piece 6 is moved to the base 3.
There is a type in which fixed contact pieces 7.8 are provided upright on the upper surface of the contact plate and are arranged so as to alternately come into contact with and separate from the opposing fixed contacts 7a and 8a.

However, in this case, for example, between the electromagnet block l and the movable contact piece 6, or between the electromagnet block 1
The insulation is simply achieved by increasing the distance between the contact piece 7.8 and the fixed contact piece 7.8. For this reason, if the components are brought closer together in order to miniaturize the device, desired insulation characteristics cannot be obtained, which poses a problem in that it is difficult to miniaturize the device.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, an object of the present invention is to provide an electromagnetic relay that can downsize the device while ensuring desired insulation characteristics.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention includes insert molding a fixed contact terminal in a column protruding from the upper surface of a base, exposing the fixed contact from the upper end surface of the column, An electromagnetic relay that connects and separates the movable contact provided on the movable contact piece from the fixed contact by driving the movable contact piece with a movable iron piece that rotates based on the excitation and demagnetization of an electromagnetic block provided on the upper surface of the base. An insulating frame body is integrally provided on the movable iron piece, and the movable contact piece and the fixed contact are separated from the electromagnetic block and the movable iron piece by the insulating frame body.

(Operation and Effects of the Invention) Therefore, according to the present invention, since the fixed contact terminal is insert-molded in the support column, its outer surface is covered, and not only the fixed contact is exposed, but also the fixed contact terminal is Since the contact point and the movable contact piece are separated from the electromagnet block and the movable iron piece by the insulating frame, the spatial distance between them is longer than in the conventional example.

Therefore, even if the components are placed close to each other, the insulation distance is long, so it is possible to obtain an electromagnetic relay that is small and has desired insulation characteristics.

(Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings of FIGS. 1 to 9.

The electromagnetic relay according to the first embodiment is basically the base! 0,
It consists of an electromagnet block 20, a movable iron piece 30, an insulating frame 40, a movable contact piece block 50, and a case 60.

The base 10 has a substantially rectangular plan view, and has fixed contact terminals 11. ! 2 and a common contact terminal 13 (Fig. 1, the contact terminal on the back side is not shown) are insert-molded in pairs symmetrically, and support portions 14a, 14 are provided near the edge of the short side.
b, 14b, +4a and 15a, l 5b, l
5b, I 5a, and the support section 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 II is a support portion +4a.
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 via a lead frame (not shown). Further, a press-fit hole 16a is provided in the upper end surface of the column portion 16.16, and an insulating wall I7 is provided between this column portion 16 and the column portions 14a 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 part 23a of the spool 23, while the iron core 2! The left magnetic pole portion 21a of the spool 23 is exposed from the upper surface of the flange 23b, and the right magnetic pole portion 21b of two iron cores is exposed from the upper surface of the flange 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 in the middle than the right magnetic pole part 21b, and has a larger attraction area, so the balance between the left and right magnetic forces is lost. 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 10 even if it is inserted into the base 10.

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

The movable iron piece 30 is approximately rectangular in plan, and has a protrusion 3I that is protruded at the center of the lower surface to serve as a pivot point, and both ends 3
The lower surfaces of 2a and 32b are Taber surfaces. Further, the movable iron piece 30 has a total of four caulking holes 33, two each facing each other with the protrusion 31 in between.

The insulating frame 40 is box-shaped and can cover the movable iron piece 30, and has support portions 14b of the base 10 at both ends.
, +5b 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
Notches 44, 44 are provided at the center of both sides.

According to this embodiment, as shown in FIG.
Fixed contacts 11a, +3a and 12a,
Since +5a are each partitioned off, the insulation properties are high.

Moreover, since the distal end of the partition piece 40a is connected and integrated with the connecting part 40b, it is difficult to deform. However, the continuous portion 40b is not necessarily necessary if only to obtain desired insulation characteristics.

Furthermore, as shown in FIG. 5, for example, the insulating frame 40 partitions the electromagnetic block 20 and the movable iron piece 30 from the movable contact piece 52 and the fixed contact 13a, so the insulation distance is long and the insulation properties are good.

The movable contact piece block 50 has a plane approximately U on the front and back of the insulating table 51.
A total of four movable contact pieces 52 and 53 in the shape of letters 52 and 53 are insert-molded and integrated (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 5ta (the tongue piece on the back side is not shown) is provided to protrude downward from the portion. And this tongue piece 51
From the outside surface of a, there is a hinge spring 54°54 in the shape of a flat road.
protrudes laterally. 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 IO, and the tip of the bent hinge spring 54 is inserted into the press-fit hole of the support 16.
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 contact type 1a, 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 53
Since a and 53b are located in positions that protrude further forward, the radius of rotation of the movable contact pieces 52 and 53 is long. 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 10, and a sealing agent 7 is inserted into a recess formed by fitting the case 60 to the base 10.
After injecting and solidifying 0, open the gas vent hole tab in the base 10.
The assembly work is completed by venting the internal gas and sealing the gas vent hole 18b 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. 6) 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. 7, 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 30 moves toward the iron core 2.
Since it is attracted to the right magnetic pole part 21b of I, 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 eighth
figure).

Therefore, after the movable contacts 52a and 52b of the movable contact piece 52 are separated from the fixed contacts 11a and 13a, the movable contact 53
a, 53b contact fixed contacts 12a, 13b.

Then, when the 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 52a, 52b and 53a, 53b switch to return to their original state.

According to this embodiment, the movable contact pieces 52, 53 have a planar path U-shape and are of a so-called double break type, so compared to the so-called single break type, for example, the contact between the fixed contact 52b and the movable contact lIa is 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.

As shown in FIG. 9, the second embodiment is a case in which fixed contacts are arranged on both sides of the electromagnet block, whereas the above-mentioned first embodiment is a case in which fixed contacts are arranged on one side of the electromagnet block. be.

That is, the iron core 7 is attached to the spool 71 around which the coil 70 is wound.
An electromagnetic block 74 is provided at the center of the upper surface of the base 75, with one protruding end serving as a magnetic pole part 72a and the other protruding end fixed by caulking to the vertical part of the oval-shaped yoke 73. It is being A substantially dogleg-shaped movable iron piece 73b is rotatably supported on the horizontal end 73a of the yoke 73, and an insulating frame 76 is integrally provided on the upper surface of this movable iron piece 73b. Further, the base 75 has a support portion 78 protruding from one side line portion of the upper surface thereof, in which a fixed contact terminal 77 is insert-molded.
While the fixed contact 79 is exposed from the upper end surface of the terminal 8, a support section 82 in which a movable contact terminal 81 is insert-molded is provided protruding from one side edge of the other upper surface. The movable contact terminal 8I has a movable contact piece 80 welded to its upper end, and a movable contact 82 provided at the free end of the movable contact piece 80 faces the fixed contact 79 so as to be able to come alongside. Note that 83 is a coil terminal.

Therefore, in the case of non-excitation, the movable contact 81 is in contact with the fixed contact 79 due to the spring force of the movable contact piece 80.

When a voltage is applied to the coil 70 to excite the electromagnetic block 74, the vertical end of the movable iron piece 73b is attracted to the magnetic pole part 72a of the iron core 72, and the movable iron piece resists the spring force of the movable contact piece 80. 73b rotates, the movable contact piece 80 is pushed upward by the protrusion 76a of the insulating frame 76, and the movable contact 82 is separated from the fixed contact 79.

Then, when the electromagnetic block 74 is de-energized, the movable contact piece 80 returns to its original position by its own spring force, and the movable contact 82 contacts the fixed contact 79.

In addition, the above-mentioned 1. In the second embodiment, a self-return type case has been described, but the present invention is not limited to this, and a self-retention type may be adopted by adjusting the shape of the iron core, the spring force of the movable contact piece, etc.

[Brief explanation of the drawing]

Figures 1 to 8 show a first diagram of the electric vertical relay according to the present invention.
Fig. 1 is an exploded perspective view, Fig. 2 is a plan sectional view, Fig. 3 is a sectional view taken along the line ■-■ in Fig. 2, Fig. 4 is a front sectional view of main parts, and Fig. 5 is a cross-sectional view of main parts. Main part side sectional view, Figures 6 to 8
The figure is an explanatory diagram for explaining the operation of the movable iron piece, FIG. 9 is a side cross-sectional view showing the second embodiment of the electromagnetic relay according to the present invention, and FIG. FIG. 3 is a plan view and a side view of the relay. lO...base, 11.12...fixed contact terminal, l
la, l 2a, l 3a, I 3b-... fixed contact, +4a, 14b, 15a, 15b... pillar part,
20... Electromagnetic block, 30... Movable iron piece, 40
...Insulating frame, 52.53...Movable contact piece, 52a
, 52b, 53a, 53b... movable contacts.

Claims (1)

[Claims] (1) A fixed contact terminal is insert-molded in a column protruding from the upper surface of the base, the fixed contact is exposed from the upper end surface of the column, and an electromagnetic block provided on the upper surface of the base is energized and demagnetized. In an electromagnetic relay in which a movable contact provided on the movable contact piece is brought into contact with and separated from the fixed contact by driving the movable contact piece with a rotating movable iron piece, an insulating frame body is integrally provided on the movable iron piece, and the insulating frame body is integrally provided with the movable iron piece, An electromagnetic relay characterized in that a frame separates the movable contact piece and the fixed contact from the electromagnetic block and the movable iron piece.