JPH04174932A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To enable conformity to miniaturization, high sensitivity and large capacity of contacts by ON-OFF operating an electromagnet provided in the vicinity of the magnetic pole of a permanent magnet which is rotatable and has a movable spring with a contact, and switching a circuit by means of moving a contact between fixed contacts. CONSTITUTION:In an initial state, a contact 25a is brought into contact with a break contact 26a, and thus, common terminal 29 is connected to an external connection terminal 26. When a current by which an end face 22a1 of a yoke becomes the N pole of a permanent magnet 24 flows from coil terminals 22b1 and b2, the N pole reacts to generate a rotaty force, and thereby an arm 30 is rotated against the magnetic attraction of a stopper 31 along the direction of the arrow B due to the deviation between the rotary center of the magnet 24 and the central line of a yoke 22. Consequently, a contact 25b and a make contact 27a are brought into contact each other so that switching to connection of the terminal 29 with the terminal 27 can be carried out. As the magnetic flux of magnets 24 and 22 is commonly used, miniaturization of a coil is enabled, a large gap between contacts 26a and 27a can be provided and application to large capacity contacts is made possible.

Description

[Detailed Description of the Invention] [Summary] Regarding electromagnetic relays used in the field of electronic equipment, especially in the consumer field, the present invention aims to improve productivity by realizing a compact electromagnetic relay with low power consumption and a large number of contacts. This is an electromagnetic relay in which a movable spring connected to a common terminal is moved by magnetic flux generated from an electromagnet, and the contacts of the movable spring are brought into contact alternately between two fixed contacts. The movable spring between the contacts is moved by the rotation of a permanent magnet that is provided with a rotating shaft and is disposed near the electromagnet so that the magnetic flux generated from the electromagnet rotates in a direction that connects the contacts. Configure.

[Industrial application field]

The present invention relates to the structure of an electromagnetic relay used in the field of electronic equipment, particularly in the field of consumer use, and particularly relates to an electromagnetic relay that is small in size, consumes little power, and has a large contact capacity, thereby improving productivity. .

In recent years, electromagnetic relays for motoronics and home appliances have become smaller, more sensitive, and have lower power consumption.

There is a strong demand for higher contact capacity.

Therefore, there are limits to the ability to meet each of the above requirements, so it is desired to solve the problem by using a non-polar relay that consumes less power or a polarized relay that has higher sensitivity or is easier to use.

[Conventional technology]

FIG. 2 is a principle diagram showing an example of the main part configuration of a conventional polarized relay, and FIG. 3 is a principle diagram showing an example of the main part construction of a conventional polarized relay.

In FIG. 2, an iron core 2 having a contact 2a around which a coil 1 is wound is fixed to one side of a yoke 3 bent at an approximately right angle, and the free end side of the yoke 3 has a The armature 4 bent at an obtuse angle is installed so as to be rotatable in the direction of arrow a with respect to the yoke 3 using the inner line of the bent portion as a hinge.

Note that 3a in the figure is a restraining spring that positions and holds the armature 4 on the yoke 3.

The armature 4 is held in the position shown in the figure by the restraining spring 4 when the iron core 2 is not excited by the coil I, but when the iron core 2 is excited by the coil I, a magnetic flux is generated. During this time, the armature 4 is attracted to the iron core 2 against the restraining spring 4.

Further, a movable spring 5 having movable contacts 5a and 5b on both sides of the tip is fixed in an insulated state to the surface of the armature 4 on the contact 2a side, and the other end of the movable spring 5 is a fixed terminal 5.
It is connected to the common terminal 5d via C.

Furthermore, when the iron core 2 is not excited, the movable contact 5a
A break contact 6 connected to an external connection terminal 6b via a fixed terminal 6a is disposed at a position where it makes contact with the movable contact 5b after being attracted by the excited iron core 2 and moved. A make contact 7 connected to an external connection terminal 7b via a fixed terminal 7a is provided at the position.

Therefore, by applying a predetermined current to the coil 1 to excite the iron core 2, the connection between the common terminal 5d and the external connection terminal 6b can be switched to the connection between the common terminal 5d and the external connection terminal 7b, making it possible to stabilize the connection. It is possible to construct an electromagnetic relay with such characteristics.

In particular, in such an electromagnetic relay, power consumption can be reduced by increasing the winding weight of the coil 1, and since the distance between the fixed contacts 6 and 7 can be changed depending on the length of the movable spring 5, a large contact capacity can be easily achieved. There are some benefits.

However, in order to respond to the miniaturization of the relay, the coil must be made smaller, and there is a drawback that there is a limit to achieving high sensitivity.

In Fig. 3, between the N and S magnetic poles of the permanent magnet 11, an armature 12, which is held by a hinge H so that it can move freely in the direction connecting the two magnetic poles, passes through the permanent magnet 11. A yoke 13 and a coil 14 are arranged around the armature 12 up to the vicinity of the permanent magnet 11, and an insulating card 15 is disposed at the tip of the free end of the armature 12.
is fixed.

In this case, the armature 12 located between the N and S magnetic poles of the permanent magnet 11 is connected to either magnetic pole (
When the yoke 13 is excited by the coil 14, the magnetic flux flowing through the yoke 13 causes a difference in the strength of each magnetic pole. The armature 12 can be moved to the other pole (in the case of the figure, the S pole) by selecting the direction and magnitude of the current flowing in the armature.

Therefore, the insulating card 1 fixed to the armature 12
5 will also move in the direction of the arrow.

The other side of the insulating card 15 has a fixed terminal 16 at one end.
A is connected to a common terminal 16b through a hole 15a, and a hole 15a is formed on both sides of the other end into which a movable spring 16 having movable contacts 16c and 16d can be inserted without play.

On the other hand, the movable spring 16, which is disposed through the hole 15a of the insulating card 15 at a position closer to the center than the mounting position of the movable contacts 16c and 16d, is attached to the fixed terminal 16.
It is held and fixed to an insulator 17 located near a.

Further, a fixed terminal 1 is provided at a position where the coil 14 contacts the movable contact 16c when the coil 14 is not excited.
A break contact 18 is connected to an external connection terminal 18b through a fixed terminal 19a, and a break contact 18 is connected to an external connection terminal 18b through a fixed terminal 19a at a position where it contacts the movable contact 16d after being moved by the magnetic flux of the excited yoke 13. A make contact 19 connected to an external connection terminal 19b is provided.

Therefore, by applying a predetermined current to the coil 14 and exciting the yoke 13, the connection between the common terminal 16b and the external connection terminal 18b can be switched to the connection between the common terminal 16b and the external connection terminal 19b.

In particular, since such an electromagnetic relay uses a permanent magnet, the contacts can be switched by a slight change in the current applied to the coil, so there is an advantage that a highly sensitive electromagnetic relay can be easily constructed.

However, since it is not possible to increase the amount of movement or stroke of the armature 12, there is a drawback that there is a limit to the contact capacity as a relay.

[Problem to be solved by the invention]

Conventional electromagnetic relay configurations have a problem in that non-polar relays have limitations in supporting high sensitivity, and polarized relays have a limit in contact capacity.

[Means to solve the problem]

The above problem is an electromagnetic relay in which a movable spring connected to a common terminal is moved by magnetic flux generated from an electromagnet, and the contacts of the movable spring are brought into contact alternately between two fixed contacts. The movable spring between the contacts is moved by the rotation of a permanent magnet that is provided with a rotating shaft and is disposed near the electromagnet so that the magnetic flux generated from the electromagnet rotates in a direction that connects the contacts. Solved by an electromagnetic relay configured.

[Operation] Another magnetic pole is detachably arranged near the magnetic pole of a permanent magnet having a reciprocating means, and when the other magnetic pole is attached and detached, the permanent magnet can be reciprocated. It can be used as a displacement.

In the electromagnetic relay according to the present invention, a permanent magnet to which a movable spring equipped with a contact is attached is configured to be able to rotate starting from a magnetic attraction position, and an electromagnet disposed near the magnetic pole of the permanent magnet is turned on and off. By doing so, the permanent magnet and thus the movable spring are reciprocated to move the contact provided at the tip between the fixed contacts and switch the circuit. .

Therefore, since the magnetic flux of the permanent magnet and the electromagnet can be used, it is possible to make the electromagnet and therefore the relay smaller and more sensitive, and since the gap between the fixed contacts can be increased, it is also possible to correspond to the increase in the capacity of the contacts. It is possible to realize an electromagnetic relay with high productivity.

〔Example〕

FIG. 1 is a diagram illustrating a configuration example of an electromagnetic relay according to the present invention, in which (A) is an overall configuration diagram, (B) is a plan view, and (C)
is a side cross-sectional view in the direction of arrow A.

In Fig. 1, there is an L-shaped yoke 2 at the bottom corner of the housing base 21a.
An electromagnet 22 having a coil 2a is fixed such that the long side of the yoke 22a is on the upper side and the iron core 22c of the coil 22b is exposed. In addition, 2 which penetrates the bottom surface and protrudes to the outside.
2b+ and 22b2 are coil terminals of the coil 22b.

Further, a disk-shaped permanent magnet 24 is fixed to a rotating shaft 23 made of an insulator such as resin and is magnetized in the diametrical direction with both N and S magnetic poles. The housing base 21 is positioned near the end surface 22a of the iron core 22c and shifted from the center of the iron core 22c by, for example, δ in FIG.
One end (lower end in the figure) of the rotating shaft 23 is inserted into a guide hole formed in a protrusion 21a+ provided on the bottom surface of the rotating shaft 23 and is rotatably held. In addition, the housing base 21
The above-mentioned rotating shaft 23 is located at a position corresponding to the guide hole of the housing base 21a on the inner surface of the cover 21b that fits into the cover 21b.
A guide hole for holding the other end is drilled, and when the cover 211 is fitted and the housing 21 is completed, the rotating shaft 23
is securely held at both ends.

Above the fixed position of the permanent magnet 24 of the rotating shaft 23, there is a strip-shaped movable spring 25, which has a first contact 25a and a second contact 25b attached to both sides of its free end. The contact points 25a and 25b are fixed on the north pole side of the magnet 24, for example.

Furthermore, at predetermined positions on both sides facing the contacts 25a and 25b, there are break contacts 26a fixed to external connection terminals 26 penetrating the bottom surface of the housing base 21a, and housing base 21.
A make contact 27a fixed to an external connection terminal 27 passing through the bottom surface of a is provided.

Therefore, the rotary shaft 23 and thus the permanent magnet 24 rotate within the angular range in which the contacts 25a, 25b of the movable spring 25 reciprocate between the break contact 26a and the make contact 27a.

Further, a lead wire 28 is soldered to the area where the movable spring 25 is fixed to the rotating shaft 23, and the other end of the lead wire 28 with an extra length passes through the bottom surface of the housing base 21a and is attached to the housing. It is connected to a common terminal 29 fixed to the body base 21a.

On the other hand, an arm 30 made of a metal plate is fixed to the upper surface of the permanent magnet 24 in a region close to the S pole, and when the first contact 25a presses the break contact 26a with a predetermined contact pressure, the arm 30 A stopper 31 made of a magnetic material is fixed to the housing base 21a at the contact position.

This means that when the first contact 25a and the break contact 26a are separated, that is, when the arm 30 and the stopper 31 are separated, the magnetic force acting between the arm 30 and the stopper 31 is This means that the permanent magnet 24 is rotated so that the contact 25a is brought into contact with the break contact 26a by an attractive force.

Therefore, in the initial steady state, the common terminal 29 and the external connection terminal 26 are connected because the contact 25a and the break contact 26a are always in contact with a constant contact pressure.

When a current is applied from the coil terminal 221) +-22b2 so that the end face 22a1 of the yoke 22a becomes the N pole, the N pole of the permanent magnet 24 is repelled by the magnetic flux at the end face 22a1, causing the permanent magnet 24 to rotate. The rotation direction of the permanent magnet 24 due to the repulsive force is deviated from the center line of the iron core 22c and the end face 22a1 of the yoke 22a as described above. (B
) is limited to the direction of arrow B.

Therefore, by appropriately setting the magnitude of the current applied to the coil terminal, the permanent magnet 24 can be rotated in the direction B against the magnetic attraction force acting between the arm 30 and the stopper 31.

Therefore, since the movable spring 25 rotates together with the permanent magnet 24, the first contact 25a and the break contact 26a are opened, and then the second contact 25b and the make contact 27a come into contact, resulting in the common terminal 29 and the external connection terminal. 26 can be switched to connection between the common terminal 29 and the external connection terminal 27.

Note that when the current applied to the coil terminal is stopped, the arm 30
The permanent magnet 24 due to the magnetic attraction force acting between the stopper 31 and
As mentioned above, the state is reversed and returns to the initial state.

In the electromagnetic relay having such a configuration, since the magnetic fluxes of the permanent magnet 24 and the electromagnet 22 are used together, the coil 22b can be made smaller, and this enables the relay to be made smaller, have higher sensitivity, and lower power consumption. Movable spring 2
Depending on the length of 5, the break contact 26a and the make contact 27
Since the gap between A and A is wide, it can also be applied to relays with large capacity contacts.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily provide a compact electromagnetic relay with low power consumption and large contact capacity.

In the description of the present invention, the permanent magnet is disk-shaped, but the same effect can be obtained with any shape as long as it can be rotated by the magnetic flux from the electromagnet.

Furthermore, in the explanation of the present invention, the permanent magnet is rotated by the repulsive force of the magnetic poles, but if the fixed position of the movable spring with respect to the permanent magnet is shifted by 90 degrees compared to the case shown in the figure, the permanent magnet will rotate. Rotation can be achieved by the attractive force of the magnetic poles.

[Brief explanation of drawings]

Figure 1 is a diagram illustrating an example of the configuration of the electromagnetic relay according to the present invention. Figure 2 is a principle diagram showing an example of the configuration of the main parts of a conventional non-polar relay. Figure 3 is an example of the configuration of the main parts of a conventional polarized relay. This is a principle diagram showing this. In the figure, 21 is a housing, 21a is a housing base, 21a
1 is a protrusion, 21b is a cover, 22 is an electromagnet,
22a is a yoke, 22a1 is an end face,
22b is a coil, 22b+, 22b2 is a coil terminal, 2
2c is an iron core, 23 is a rotating shaft, 24 is a permanent magnet, 25 is a movable spring, 25a is a first contact, 25
b is a second contact, 26.27 is an external connection terminal, 26a is a break contact, 27a is a make contact, 28 is a lead wire,
29 is a common terminal, 30 is an arm,
31 each represents a stopper. 2
Rin No. 3

Claims (2)

[Claims] (1) An electromagnetic relay in which a movable spring connected to a common terminal is moved by magnetic flux generated from an electromagnet, and the contacts of the movable spring are brought into alternate contact between two fixed contacts ( 26a, 27a) between the movable springs (2
A permanent magnet (5) is provided with a rotating shaft (23) and is disposed near the electromagnet (22) so that the movement of the electromagnet (22) rotates in a direction that connects the contacts with the magnetic flux generated from the electromagnet (22). 24) An electromagnetic relay characterized in that it is configured to be rotated by the rotation of. (2) The means for moving the movable spring between two fixed contact points has one end fixed to a rotatable rotating shaft (23) set up in the casing (21) and the other end maintaining a required distance. a movable spring (25) located between the break contact (26a) and the make contact (27a) fixed to the housing (21);
23), a stopper (31) made of a magnetic material that attracts the permanent magnet (24) to the rotation start position, and a stopper (31) made of a magnetic material that attracts the permanent magnet (24) at the rotation start position to the yoke end face. (22a_1) and an electromagnet (22) that is rotated by magnetic poles generated in
The first contact (25a) located at the tip of the movable spring (25) comes into contact with the break contact (26a), and when the electromagnet (22) is activated and the permanent magnet (24) rotates, the first contact (25a) is located at the tip of the movable spring (25). The second contact (25b) is the make contact (2
7. An electromagnetic relay according to claim 1, characterized in that it is configured to be in contact with 7a).