JPH06236725A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To provide a small-sized electromagnetic relay applicable also to bipolar contact structure. CONSTITUTION:When a coil block 30 is excited, polarity is differed between arm parts 35a, 35b of an iron core 31, and the respective end parts of iron pieces 41a, 41b magnetized to different polarities by a permanent magnet are attracted by magnetic pole parts 37, 38 of the arm parts 35a, 35b having the polarities different from these end parts. Thus, an armature block 40 is rotated within a surface orthogonal to the axial center direction of the coil block 30 with hinge parts 44a, 44b as a center to drive a movable contact piece 29, whereby a movable contact provided in the base block 20 is closed to a fixed contact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic relay.

[0002]

2. Description of the Related Art Conventionally, as an electromagnetic relay having a small size and good assembling, for example, as shown in FIG. 6, a coil block 3 and an armature block 4 are arranged side by side in a housing portion 2 of a base block 1 and housed. (Japanese Patent Laid-Open No. 2-253533). A coil terminal 5, a common terminal 6 and a fixed contact terminal 7 are integrally formed on the base block 1, and the housing portion 2 is divided into two by an insulating wall 8 provided along the longitudinal direction.

The coil block 3 is formed by winding a coil 11 around a substantially U-shaped iron core 9 via a spool 10 and is disposed in one of the housing portions 2 of the base block 1.
On the other hand, both ends of the iron core 9 project laterally and are positioned on the other side of the housing portion 2, and a permanent magnet 12 is interposed between the iron cores 9.

The armature block 4 is formed by integrally molding the iron piece 13 and the movable contact piece 14, and the central portion thereof is swingably mounted on the center of the permanent magnet 12. In addition, 15 is a case. When the coil block 3 is excited or demagnetized, the armature block 4 swings so that the movable contacts 16 provided at both ends of the movable contact piece 14 alternately come in contact with and separate from each fixed contact 17, that is, a so-called one pole. It has a contact structure.

[0005]

However, in the above electromagnetic relay, since the armature blocks 4 are arranged side by side along the longitudinal direction of the coil block 3, the range in which they must be electrically insulated. Is wide. That is, in the armature block 4, the movable contact pieces 14 are projected from the central portion to both sides, and moreover, each movable contact piece 14 needs to have a certain size in order to obtain a predetermined contact pressure.
There is a limit to shortening the total length. On the other hand, it is necessary to match the total length of the coil block. Therefore, as described above, the space region where both members are adjacent to each other is widened, and the insulating range by the insulating wall 8 or the like is increased.

Further, if an attempt is made to adopt a two-pole contact structure (one having a pair of contact opening / closing portions for one common terminal) as the structure of the electromagnetic relay, for example, the coil block 3 will be used. Armature block 4 on both sides of
Since a structure for swinging is required, there is a problem in that the size is increased in the width direction. In view of the above problems, it is an object of the present invention to provide an electromagnetic relay that is small and is applicable to a two-pole contact structure.

[0007]

In order to achieve the above object, the present invention divides an upper portion into a coil accommodating portion and a contact mechanism accommodating portion by an insulating wall, and the contact mechanism accommodating portion includes the insulating wall side and the contact mechanism accommodating portion. A fixed contact is provided on the opposite side of the base block, and a movable contact piece having a movable contact at its free end that faces the fixed contacts so that they can come into contact with and separate from the fixed contacts. A coil wound around an iron core, and when the coil is accommodated in the coil accommodating portion of the base block, has arm portions extending at the contact mechanism accommodating portion at both ends of the iron core, and a tip side of the arm portion And on the base side,
Between each arm, a coil block having magnetic poles formed at opposite positions up and down, a pair of iron pieces arranged at a predetermined interval, a permanent magnet sandwiched so that different polarities come into contact with an intermediate portion of the iron pieces, And a pair of hinge portions integrally fixed to the respective arm portions, having a pressing portion for pressing the movable contact piece to open and close the contact, and each of them is based on the excitation / demagnetization of the coil block. An armature block that rotates when iron pieces are attracted to the corresponding magnetic pole portions is used. In addition, a hinge connection to which the hinge part of the armature block is fixed to the arm part of the iron core is formed by shifting the plate thickness dimension of the hinge part, and both sides of the hinge connection part are pressed by pressing or the like. You may make it form it.

[0008]

According to the above construction, the armature block is assembled to the coil block by fixing the hinge part to the hinge connecting part, and the armature block is arranged in the contact mechanism housing part and the coil block is arranged in the coil housing part. It is assembled by placing both on a base block. As a result, the coil block and the contact mechanism are insulated from each other by the insulating wall, and the armature block is located on the side of the coil block. When the coil block is excited, the armature block swings so as to be orthogonal to the axial direction of the coil block, and the armature block simultaneously drives a plurality of movable contact pieces.

If the hinge connecting portions are formed so as to be offset from each other by the plate thickness of the hinge portions, the armature block can be easily assembled to the coil block only by fixing the hinge portions to the hinge connecting portions of the arms. . Then, if the magnetic pole portion is formed by press working or the like, the positional relationship with the hinge connecting portion, that is, the dimension between the end portion of the iron piece becomes accurate,
The armature block rotates accurately.

[0010]

Embodiments of the present invention will now be described with reference to the accompanying drawings. FIG. 1 shows an exploded perspective view of an electromagnetic relay, which generally includes a base block 20, a coil block 30,
It is composed of an armature block 40 and a case 50.

The base block 20 is a flat base 2.
A coil terminal 22, a fixed contact terminal 23, a common terminal 24, and a fixed contact terminal 23 are integrally formed on both side portions of 1 in order from the coil housing portion 26 side at substantially equal intervals. A first insulating wall 25 is projectingly provided at the center of the upper surface of the base 21 and is divided into two in the longitudinal direction so that the coil housing 2
6 and the contact mechanism housing 27 are formed. The contact mechanism accommodating portion 27 is further divided into a first contact mechanism accommodating portion 27a and a second contact mechanism accommodating portion 27b by a second insulating wall 28 protruding from the upper surface of the base 21 along the longitudinal direction thereof.

The electrical connection portions 22a formed on the upper ends of the coil terminals 22 are exposed on the upper surface at both corners of the coil housing portion 26. The fixed contacts 23a and 23b (see FIGS. 2 and 3) fixed to the upper end of the fixed contact terminal 23 are the first of the first contact mechanism accommodating portion 27a (the fixed contact terminal (not shown) is the second contact accommodating portion 27b). It faces upward in the vicinity of the insulating wall 25 and on the opposite side.

The upper end of the common terminal 24 is divided into two forks.
The tip is bent into a crank shape to form the welded portions 24a, 24
b (see FIG. 3). Each welded part 24a, 24b
A base of a movable contact piece 29 is welded to the movable contact piece 29, and a movable contact 29a having a twin structure is provided at the free end of the movable contact piece 29.
29b faces the corresponding fixed contacts 23a and 23b so as to be able to come into contact with and separate from them.

The coil block 30 is formed by winding a coil 32 around an iron core 31, and is housed in the coil housing portion 26 of the base block 20. The lead wire 32a of the coil 32 is wound around a coil winding portion 34 (one of which is not shown) provided on the collar portions 33a and 33b on both ends, and the lower end portion of the coil winding portion 34 is the coil housing portion 2
6 are respectively connected to the electrical connection portions 22a exposed.

Also, arm portions 35 are provided from both ends of the iron core 31.
a and 35b extend at right angles. Arm 35
The lower surface of the intermediate portion of a and the upper surface of the intermediate portion of the arm portion 35b are hinge connecting portions 36a and 36b, respectively. The lower surface of the hinge connecting portion 36a and the upper surface of the hinge connecting portion 36b are the hinges of the armature block 40 described below. The heights of the portions 43a and 43b are made different by the plate thickness (see FIG. 5). Magnetic pole portions 37 and 38 having different magnetic pole face positions are formed on both sides of the hinge connecting portions 36a and 36b by press working (see FIG. 4), and the polarity is changed by changing the direction of the current passing through the coil 32. It is supposed to be done.

As shown in FIGS. 1 and 2, the armature block 40 includes a pair of iron pieces 41a, 4 arranged at a predetermined interval.
A permanent magnet 42 is arranged in the middle portion of 1b.
Two substantially T-shaped hinge portions 43a and 43b are respectively positioned on both sides of 2 and integrally molded. The iron piece 41
The intermediate portions of a and 41b are bent, and the positions of both end portions are vertically displaced.
Both ends of a and 41b are the N pole and the S pole. The upper surfaces of both ends of the hinge portion 43a are fixed to the hinge connecting portion 36a of the arm portion 35a, and the lower surface of both ends of the hinge portion 43b are fixed to the hinge connecting portion 36b of the arm portion 35b by spot welding. On the lower surface of the armature block 40, a pair of pressing portions 44a and 44 are arranged in the width direction so that the rear surfaces of the movable contact pieces 29 can be pressed.
b (only one side in FIG. 1) is formed.

As described above, the respective constituent members can be easily manufactured by integral molding, and are assembled as follows to form an electromagnetic relay. That is, the armature block 40 is inserted from the side of the arm portions 35a, 35b of the coil block 30, and the hinge connecting portions 36a, 3 of the arm portions 35a, 35b are inserted.
The hinge portions 43a and 43b are located at 6b. In this case, the hinge connecting portions 36a, 36 of the iron pieces 41a, 41b are
As described above, since there is a step provided between the b portions by the thickness of the hinge portions 43a and 43b, the hinge portions 43a and 43b are not formed.
There is no need to subject the 3b to special processing such as bending which is difficult to adjust.

Then, the armature block 40 is assembled to the coil block 30 by spot welding both ends of the hinge portions 43a and 43b to the hinge connecting portions 36a and 36b. This armature block 40 is a coil block 3
When assembled to 0, the coil block 30 swings in a plane orthogonal to the axial direction.

Subsequently, both are placed on the base block 20. At this time, the coil block 30 is attached to the coil housing portion 2.
6, the armature blocks 40 are positioned in the contact mechanism accommodating portions 27, respectively. Finally, the base block 20 is covered with the case 50, and a sealing agent is applied to the lower surface of the base block 20 to seal the inside. In this state, the position of the coil block 30 is restricted by the upper surface of the coil housing portion 26 of the base block 20 and the inner surface of the case 50.

In the electromagnetic relay thus formed, by energizing the coil 32 to excite the coil block 30, the arm portion 35a side is the N pole and the arm portion 35b side is the S pole.
Assuming that the pole is a pole, the permanent magnet 42 makes the iron piece 41a an N pole and the iron piece 41b an S pole.
The end portions of 1a and 41b are attracted, and the armature block 40 rotates clockwise in FIG. As a result, the back surface of the movable contact piece 29 is pressed by the pressing portion 44a, and the movable contact 29a is closed by the fixed contact 23a. When the coil block 30 is demagnetized, the magnetic force of the permanent magnet 42 maintains the rotating state of the armature block 40.
The contacts 29a and 23a remain closed.

When the coil block 30 is excited by reversing the direction of the current flowing through the coil 32, the arm portion 35a
Since the side is the S pole and the arm portion 35b side is the N pole, the armature block 40 rotates counterclockwise in FIG. 3, and the movable contact 29a is separated from the fixed contact 23a by the pressing portion 44b thereof. The movable contact 29b is closed to the fixed contact 23b. When the coil block 30 is demagnetized, the contacts 29b and 23b maintain the closed state as described above. In addition, in the above-described embodiment, the one having the two-pole contact opening / closing mechanism has been described, but the present invention can be applied to a one-pole or three-pole or more contact opening / closing mechanism.

[0022]

As is apparent from the above description, according to the electromagnetic relay of the present invention, the armature blocks are arranged on the side of the coil block, and the armature blocks can be assembled simply by placing them on the base block. Therefore, the assembling work can be easily performed. Further, since the armature block is arranged on the side of the coil block, the height dimension can be suppressed, and the armature block is swung in the direction orthogonal to the axial direction of the coil block. Therefore, even if the contact structure has two poles, the contacts can be opened and closed by the armature block while the size is reduced. Furthermore, since the coil block and the armature block are formed in each of the accommodating portions by the insulating wall that divides in the longitudinal direction of the base, the range in which the insulating wall is provided can be reduced. Further, if the arm portion is provided with a step corresponding to the plate thickness of the hinge portion, no special processing is required for the armature block and the two are in surface contact with each other, so that the rotating operation is stable. Moreover, since the magnetic pole portion can be formed by pressing or the like, the positional relationship with the end portion of the iron piece becomes accurate, and the turning operation can be performed accurately.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an electromagnetic relay according to this embodiment.

FIG. 2 is an assembled plan sectional view of FIG.

FIG. 3 is an assembled front sectional view of FIG. 1.

FIG. 4 is a sectional view taken along the line AA of FIG.

5 is a sectional view taken along line BB of FIG.

FIG. 6 is an exploded perspective view of an electromagnetic relay according to a conventional example.

[Explanation of symbols]

20 ... Base block, 23a ... Fixed contact, 25 ... Insulating wall, 29 ... Movable contact piece, 29a ... Movable contact, 30 ... Coil block, 31 ... Iron core, 32 ... Coil, 35a, 35
b ... Arm portion, 37, 38 ... Magnetic pole portion, 40 ... Armature block, 41a, 41b ... Iron piece, 42 ... Permanent magnet, 43a,
43b ... Hinge part, 44a, 44b ... Pressing part.

Claims (2)

[Claims] 1. An insulating wall divides an upper part into a coil accommodating portion and a contact mechanism accommodating portion, and the contact mechanism accommodating portion is provided with a fixed contact on the insulating wall side and an opposite side thereof, respectively, and at a free end portion. A base block formed by extending a movable contact piece having a movable contact facing each of the fixed contacts so as to be able to come into contact with and separated from the fixed contacts; and a coil of the base block, wherein a coil is wound around an iron core. When housed in the housing part, the contact mechanism housing part has arms extending at both ends of the iron core, and magnetic poles are provided at the tip end side and the base part side of the arm parts, and the arm parts are vertically opposite to each other. Coil blocks each having a portion, a pair of iron pieces arranged at a predetermined interval, a permanent magnet sandwiched so that different polarities come into contact with an intermediate portion of the iron pieces, and
A pair of hinges fixed to each of the arms is integrally formed, and has a pressing portion that presses the movable contact piece to open and close the contact, and each iron piece is formed based on the excitation / demagnetization of the coil block. An electromagnetic relay, comprising: an armature block that is attracted to a corresponding magnetic pole portion and rotates. 2. A hinge connection to which a hinge part of the armature block is fixed to the arm part of the iron core is formed by shifting a plate thickness dimension of the hinge part, and both sides of the hinge connection part are pressed. The electromagnetic relay according to claim 1, wherein the electromagnetic relay is formed by being dented by the like.