JPH11354001A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of components and assembling man-hours and to simplify production processes and production management by connecting moving contacts of moving contact pieces of a moving block rotated by an electromagnet to adjacent fixed contact terminals of fixed contacts contacting/separating, to/from the fixed contacts through a disconnectable connecting part. SOLUTION: A moving block 30 provided with a moving iron 33 is rotatably supported by projecting parts 26a, 26b protruded on an upper surface recessed part 25 of a base block 20 built-in with an electromagnet equipped with magnetic pole parts 11a, 11b, and connection parts 32c of a moving contact piece 32 are connected to connection receiving parts 21a of common terminals 21. The current carrying direction of the electromagnet is varied to rotate the moving block 30, thereby contacting/ separating moving contacts on both ends of the moving contact pieces 32 to/from fixed contacts 22a, 23a exposed on the upper surface of the recessed part 25 and retaining connections through a permanent magnet mounted to the lower part of the moving iron piece 33. At least one fixed contact terminal 23 of the adjacent fixed contacts 23a is formed short-circuited by a connecting part 23d and is disconnected, removed or retained, as required.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay,
The present invention relates to a connection structure of an electromagnetic relay having a double break contact.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic relay, for example, there is an electromagnetic relay described as a conventional example in JP-A-8-124469. That is, a movable block in which an intermediate portion of a movable iron piece and movable contact pieces arranged side by side on the both sides are integrally formed by an insulating stand, and a movable block in which the intermediate portion of the movable contact piece is electrically connected to a common terminal, respectively. An electromagnetic relay that rotates based on excitation and demagnetization of the block and moves a movable contact provided at a free end of the movable contact piece toward and away from a fixed contact.

However, based on the above-mentioned two-pole electromagnetic relay, there is a case where a one-pole electromagnetic relay having a high withstand voltage, exclusively for normally open or normally closed, having a so-called double break contact is sometimes manufactured. In such a case, for example, it is necessary to form a movable block having a pair of movable contact pieces connected and short-circuited. Therefore, according to the above-described electromagnetic relay, different parts must be prepared in order to manufacture electromagnetic relays having different specifications. As a result, the number of parts increases, and it is necessary to create a production line for each different specification. Therefore, there is a problem that the number of production steps increases and production management becomes complicated.

In view of the above problems, it is an object of the present invention to provide an electromagnetic relay having a small number of parts and a small number of assembling steps, and a simple production process and production management.

[0005]

In order to achieve the above object, an electromagnet device according to the present invention is integrated with a movable iron piece and an insulating table formed at an intermediate portion between movable contact pieces juxtaposed on both sides thereof, and The movable block, which electrically connects the middle part of the movable contact piece to the common terminal, is rotated based on the excitation and demagnetization of the electromagnet block, and the movable contacts provided at both ends of the movable contact piece alternately become fixed contacts. In the electromagnetic relay that comes into contact with and separates from the fixed contact, at least one fixed contact terminal of the adjacent fixed contact located on one side is connected by a disconnectable connecting portion.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment according to the present invention will be described with reference to FIGS. That is, as shown in FIGS. 1 to 14, the electromagnetic relay according to the first embodiment generally includes a base block 20, a movable block 30, and a case 40, which are formed by performing secondary molding on an electromagnet block 10. It becomes. Incidentally, the outer dimensions (width × length × height) of this electromagnetic relay are 10 mm × 6.5 mm × 5 mm.

As shown in FIGS. 3 (b) and 4, the electromagnet block 10 has a coil 1 attached to a substantially U-shaped iron core 11.
6 is wound. As a method of manufacturing the electromagnet block 10, as shown in FIG. 5, first, a substantially U-shaped iron core 11 is subjected to primary molding to form a spool 12.
The spool 12 includes flanges 13 and 14 formed on both ends of the iron core 11, respectively. A pair of connecting pieces 18 protruding from both side surfaces of the flange 14 extend along the axial direction. Further, a coil 16 is wound around an intermediate portion of the iron core 11, and the lead wire is connected to the flange 1
3 of the relay terminal 17 which is insert-molded into
And soldered (Fig. 6).

The base block 20 is formed by subjecting the electromagnet block 10 connected to the lead frame 50 to secondary molding, as shown in FIGS.
As shown in FIG. 9, the lead frame 50 includes a common terminal 21, fixed contact terminals 22, 23 and a coil terminal 2.
4 is cut out and bent, and the support piece 51 is cut out and bent. However, the fixed contact terminal 2
The fixed contacts 22a and 23a are provided in advance in the fixed contacts 2 and 23, respectively.

The relay terminal 1 of the electromagnet block 10
7 is welded and integrated with the free end of the coil terminal 24 of the lead frame 50, and the connecting piece 18 is welded and integrated with the support piece 51 of the lead frame 50, and then these are positioned in a mold to perform secondary molding. I do. However, the base block 20 is completed by cutting the connecting piece 18 from the lead frame 50 and cutting and bending each of the terminals 21 to 24. At this time, the terminals 21 to 24
Is substantially flush with the outer surface of the base block 20.

Each of the terminals 21 to 24 protruding from the side surface of the base block 20 has narrow portions 21b, 22b, 23 at its base as shown in FIGS. 9B and 9C, for example.
b, 24b (the narrow portions 21b, 24b are not shown). Therefore, when the terminals 21 to 24 are bent downward, the terminals 21 to 24 can be bent with high dimensional accuracy from a predetermined position without using a mold for forming a reference surface, and the bending positions do not vary. As a result, the terminals 21 to 24 are fitted into the shallow grooves provided on the outer surface of the base block 20, and these outer surfaces are substantially flush. When the thickness of each of the terminals 21 to 24 is, for example, 0.15 mm, each of the narrow portions 21 b to 24 from the side surface of the base block 20 before bending.
The distance to b may be 0 to 0.05 mm.

As shown in FIG. 1, the base block 20 obtained by the above-described secondary molding has a shallow recess 25 on its upper surface, and a pair of Protrusions 26a and 26b are protruded. One convex part 26
“a” has a long ridgeline such that the top thereof is in line contact with a movable block 30 described later. The other convex portion 26b is
In order to absorb variations in dimensional accuracy in the width direction, the protrusion 26
It has a ridge top that is shorter than a.

A fixed contact terminal 2 is provided at the corner of the recess 25.
2, 23 fixed contacts 22a and 23a are respectively exposed. The magnetic pole portions 11a and 11b of the iron core 11 are exposed between the adjacent fixed contacts 22a and 22a and between the adjacent fixed contacts 23a and 23a, respectively.
Further, the magnetic pole portions 11a and 11b of the iron core 11 are separated from the fixed contacts 22a and 23a by insulating walls 27 having a substantially U-shaped plane. The outer side surface of the insulating wall 27 facing itself is a tapered surface (FIG. 4). The connection receiving portion 21a of the common terminal 21 is exposed from the corner of the opening edge of the base block 20 substantially at the center of the side.

As shown in FIGS. 1 and 2, a projection 28 projects from the center of both end faces of the base block 20. As shown in FIG. As shown in FIG. 3B, the protrusion 28
The connecting piece 18, the fixed contact terminal 23, and the coil terminal 24 protrude forward from the uncut ends 18a, 23c, and 24c. This is to prevent, for example, the end portion 23c and the end portion 24c from climbing over or catching with each other when the base block 20 is continuously transported.

The movable block 30 is shown in FIG.
As shown in (b), the movable contact pieces 32, 32 are arranged on both sides of the permanent magnet 31 and the movable iron piece 33 is overlapped on one surface of the permanent magnet 31, and then the insulating table 34 is formed by resin molding. And integrated.

The permanent magnet 31 is narrower than the movable iron piece 33, and is superposed on a so-called drooping surface of the movable iron piece 33. This is to prevent the permanent magnet 31 from contacting the so-called burr generated when the movable iron piece 33 is subjected to press working, so that no gap is generated between the two.

Further, after partially joining the edge of the joint surface between the permanent magnet 31 and the movable iron piece 33, resin molding may be performed. As the temporary fixing method, for example, an existing method such as laser welding, welding with a gas burner, spot welding, or the like can be used. Alternatively, a joining metal thin film formed on a joining surface of both may be melted and integrated. As a metal thin film for bonding,
For example, a simple substance such as nickel, zinc, cadmium, tin, copper, chromium, lead, silver, gold, and palladium or an alloy thereof may be used. In addition, as a method for forming the bonding metal thin film, existing methods such as plating, vapor deposition, and coating can be selected. Further, the bonding metal thin film may be formed on the entire bonding surface, or may be formed only on the edge of the bonding surface or only on the center. Examples of the method for melting the bonding metal thin film include laser irradiation, heating using a gas burner, and an existing heating method using electric resistance.

The movable contact piece 32 is formed by punching a conductive thin plate spring material. Movable contacts 32a and 32b are provided on each of the divided pieces at both ends formed by dividing in the width direction. . Further, the movable contact piece 32 has a substantially T-shaped connecting portion 32c extending laterally from a substantially central portion of the side.

As a method of forming the movable block 30, for example, after the movable contacts 32a and 32b are provided, the movable contact pieces 32 and 32 cut out from a lead frame (not shown) by press working are positioned in a mold. Next, there is a method in which the temporarily fixed permanent magnet 31 and the movable iron piece 33 are positioned in the mold, and then integrated by an insulating table 34 formed of a resin mold. The movable iron piece 33 has the same configuration as that of the iron core 11 except for a portion in contact with the magnetic pole portions 11a and 11b.
The entire surface may be resin-molded to enhance the insulating properties.

Then, the movable block 30 is dropped into the base block 20 from above, and a pair of recesses 34a and 34b (FIG. 2) provided on the lower surface of the insulating table 34 are formed on the upper surface of the base block 30 by projecting protrusions 26a. , 26b are automatically positioned. Further, the connection portion 32c of the movable contact piece 32 is connected to the connection receiving portion 2 of the common terminal 21.
The movable block 30 is rotatably supported by welding to 1a.

In the present embodiment, the concave portions 34 a and 34 b provided on the lower surface of the insulating table 34 are connected to the convex portions 26 of the base block 20.
a and 26b to be fitted and supported. For example, even if the distance between the convex portions 26a and 26b has a variation due to the processing tolerance, the ridgeline at the top of the convex portion 26b is shorter than that of the convex portion 26a, and the variation in the processing tolerance can be absorbed. Therefore, it is possible to avoid a malfunction due to a variation in processing tolerance. Also, the concave portion 34 of the insulating table 34
a, 34b and the convex portions 26a, 26 of the base block 20.
The contact portion with b is located on substantially the same plane as the connecting portion 32c serving as the rotation axis. For this reason, there is no play due to the variation of the rotation axis, and a smooth rotation can be obtained.

In this embodiment, two convex portions 26 are provided.
Although the case where a and 26b are formed has been described, the present invention is not limited to this, and one or two or more may be formed. The shape of the projections 26a and 26b is not limited to the above-described one, and the top may be a triangular prism, a cone, or a hemisphere. Furthermore, while the tops of the protrusions 26a and 26b are formed to have an acute angle, and the bottoms of the recesses 34a and 34b are formed to have an obtuse angle, it is possible to provide a structure in which the rotation fulcrum hardly rattles.

In this electromagnetic relay, the spatial distance between the movable contact piece 32 and the movable iron piece 33 is about 0.9 mm. However, as shown in FIGS. 11 and 14, as a result of assembling the movable block 30 to the base block 20, the substantially U-shaped insulating wall 27 separates the movable iron piece 33 and the movable contact piece 32. For this reason, the creepage distance between the two becomes long, and the insulation characteristics are high. Then, both ends 34 of the insulating table 34
c and 34 d extend long and overlap the insulating wall 27. For this reason, the extension distance between the two becomes even longer,
There is an advantage that the insulation characteristics are improved.

As shown in FIG. 1, the case 40 has a box shape that can be fitted to the base block 20, and has a notch 41 for fitting formed at the opening edge thereof. Also,
The case 40 has a gas vent hole 42 at the edge of the ceiling surface. Further, as shown in FIG. 2, the case 40 has an insulating rib 43 protruding from a ceiling surface thereof. One end of the insulating rib 43 is continuous with the inner surface of the case 40, and the joining surface joining the insulating wall 27 of the base block 20 is a tapered surface.

Then, the case 40 is attached to the base block 20 to which the movable block 30 is attached, and the terminal 2
The notches 41 are fitted to the respective 1 to 24. As a result, as shown in FIG.
Abuts against the outer surface of the insulating wall 27 provided on the base block 20. For this reason, the creepage distance between the two becomes longer,
The insulation properties are improved. Also, since the joining surfaces of both the insulating wall 27 and the insulating rib 43 are tapered surfaces,
There is an advantage that smooth assembling is possible and the assembling work is facilitated. Note that the insulating ribs 43 may be in contact with the opposing inner surfaces of the insulating wall 27.

Next, the base block 20 and the case 40
After sealing the joint surface with the gas vent hole 4 of the case 40,
The assembly operation is completed by extracting the internal gas from 2 and thermally sealing the gas vent hole 42.

Next, the operation of the electromagnetic relay having the above-described structure will be described. First, when no voltage is applied to the coil 16 of the electromagnet block 10, one end 33a of the movable iron piece 33 is attracted to the magnetic pole part 11a of the iron core 11 by the magnetic force of the magnetic flux of the permanent magnet 31, and the magnetic circuit is closed. And the movable contact 32a of the movable contact piece 32 is in contact with the fixed contact 22a.

When a voltage is applied to the coil 16 of the electromagnet block 10 so that a magnetic flux for canceling the magnetic flux of the permanent magnet 31 is generated, the movable iron piece 33 rotates against the magnetic force of the permanent magnet 31, and The movable contact piece 32 rotates. For this reason, after the movable contact 32a is separated from the fixed contact 22a, the movable contact 32b contacts the fixed contact 23a, and the other end 33b of the movable iron piece 33 is connected to the magnetic pole 1 of the iron core 11.
Adsorb to 1b. And even if the application of the above-mentioned voltage is released, the movable block 30
Hold that state.

Further, when a voltage in a direction opposite to the above-described application direction is applied to the coil 16, the coil 16 resists the magnetic force of the permanent magnet 31,
The movable iron piece 33 rotates in the direction opposite to the above-described rotation direction, and accordingly, the movable contact piece 32 also rotates. Therefore, the movable contact 32b is separated from the fixed contact 23a, and the movable contact 32a
After contacting with the fixed contact 22a, one end 33a of the movable iron piece 33 is attracted to the magnetic pole portion 11a of the iron core 11 and returns to the original state.

The electromagnetic relay according to the second embodiment is shown in FIG.
As shown in FIG. 5 to FIG.
Of the pair of fixed contact terminals 22, 22 and 23, 23,
A connecting portion 23d for short-circuiting a pair of fixed contact terminals 23, 23
Is cut out from the lead frame 50 (FIG. 16) and bent (FIGS. 17 (a) and 17 (b)). On the other hand, the terminal portions of the remaining pair of fixed contact terminals 22, 22 have been cut and removed. The other parts are the same as those of the first embodiment, and the description is omitted. Therefore, according to the present embodiment, there is an advantage that a normally open electromagnetic relay having a so-called double break contact and having high withstand voltage can be obtained.

An electromagnetic relay according to the third embodiment is shown in FIG.
As shown in FIG. 9 and FIG.
Of the pair of fixed contact terminals 22, 22 and 23, 23,
A connecting portion 22d for short-circuiting a pair of fixed contact terminals 22, 22
Is cut out from the lead frame 50 (FIG. 19) and bent to manufacture. On the other hand, the remaining pair of fixed contact terminals 2
The terminal portions 3 and 23 are cut and removed. The other parts are the same as those of the first embodiment, and the description is omitted. Therefore, according to the present embodiment, as in the second embodiment, there is an advantage that a magnetic relay having a so-called double break contact and having a high withstand voltage and dedicated to a normally closed state can be obtained.

In the above embodiment, the self-holding type electromagnetic relay has been described. However, the present invention is not limited to this.
Needless to say, the present invention may be applied to a self-recovering type electromagnetic relay.

[0032]

As is apparent from the above description, according to the electromagnetic continuity device according to the present invention, the connecting portion for connecting the fixed contact terminals can be cut, removed, or left as necessary. A double break contact can be formed at a desired position. Therefore, even when manufacturing electromagnetic relays having different specifications, there is no need to stock many types of parts as in the conventional example, and the number of parts and the number of assembly steps are reduced.
As a result, there is no need to make a major change to the existing pressing, molding, and assembling processes, and the production process and production management are simplified.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an electromagnetic relay showing a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the electromagnetic relay of FIG. 1 when viewed from below.

3A and 3B show a state after assembling the electromagnetic relay shown in FIG. 1, wherein FIG. 3A is a partial plan view and FIG. 3B is a partial front view.

FIG. 4 is a side sectional view of the electromagnetic relay shown in FIG.

5A and 5B show an iron core in which a spool is integrally formed. FIG. 5A is a perspective view seen from above, and FIG. 5B is a perspective view seen from below.

6A and 6B show an electromagnet block, wherein FIG. 6A is a perspective view seen from above, and FIG. 6B is a perspective view seen from below.

FIG. 7 is a plan view for explaining a secondary molding method of the electromagnet block.

FIG. 8 is a perspective view for explaining a secondary molding method of the electromagnet block.

9A and 9B show a secondary molding method of the electromagnet block. FIG. 9A is a plan view, and FIGS. 9B and 9C are enlarged plan views of a main part.

10A and 10B show a secondary molding method of the electromagnet block, wherein FIG. 10A is a side view and FIG. 10B is a front view.

FIG. 11 is a plan view showing an electromagnet block after secondary molding.

FIG. 12 is an explanatory diagram showing a terminal arrangement and an internal connection diagram.

13 is an exploded perspective view of the movable block before resin molding, in which FIG. 13 (a) is an exploded perspective view seen from above, and FIG. 13 (b) is an exploded perspective view seen from below.

FIG. 14 is a perspective view showing a state where a movable block is assembled to a base block.

FIG. 15 is an exploded perspective view showing a second embodiment of the base block of the present invention.

FIG. 16 is a plan view showing an electromagnet block after secondary molding.

17A and 17B show the base block after the secondary molding. FIG. 17A is a perspective view before bending the uncut connecting portion, and FIG. 17B is a perspective view before bending.

FIG. 18A shows a terminal arrangement and an internal connection diagram according to the second embodiment, and FIG. 18B is a circuit diagram.

FIG. 19 is a plan view showing an electromagnet block according to a third embodiment of the present invention after secondary molding.

FIG. 20A shows a terminal arrangement and an internal connection diagram of the third embodiment, and FIG. 20B is a circuit diagram.

[Explanation of symbols]

10: electromagnet block, 11: iron core, 11a, 11b ...
Magnetic pole part, 12 ... spool, 13, 14 ... flange part, 16 ... coil, 17 ... relay terminal, 18 ... connecting piece, 18a ... end part,
Reference numeral 20: base block, 21: common terminal, 21a: connection receiving portion, 21b: narrow portion, 22, 23: fixed contact terminal,
22a, 23a: fixed contact, 22b, 23b: narrow portion,
22c, 23c: end portion, 22d, 23d: connecting portion, 24
... Coil terminal, 24b ... narrow part, 24c ... end part, 25 ...
Recess, 26a, 26b ... convex, 27 ... insulating wall, 28 ... protrusion, 30 ... movable block, 31 ... permanent magnet, 32 ... movable contact piece, 32a, 32b ... movable contact, 32c ... connection part,
33: movable iron piece, 34: insulating stand, 34a, 34b: concave portion, 34c, 34d: end portion, 40: case, 41: notched portion, 42: gas vent hole, 43: insulating rib, 50 ...
Lead frame, 51 ... support piece.

Claims (1)

[Claims] 1. A movable iron piece and an insulating table formed at an intermediate portion between movable contact pieces juxtaposed on both sides thereof are integrated with each other, and
A movable block in which an intermediate portion of the movable contact piece is electrically connected to a common terminal is rotated based on excitation and demagnetization of an electromagnet block, and movable contacts provided at both ends of the movable contact piece alternately become fixed contacts. In the electromagnetic relay to be separated and connected, the fixed contact terminals of the adjacent fixed contacts located at least on one side are connected by a disconnectable connecting portion.