JPS59114721A - Transfer type electromagnetic relay - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electromagnetic relay in which a contact component is enclosed in a sealed container, and particularly to an electromagnetic relay that performs transfer operation.

Conventionally, this type of electromagnetic relay has the following configuration. Here, this electromagnetic relay will be explained with reference to the drawings.

In the transfer type electromagnetic relay shown in FIGS. 1 and 2, a neutral terminal 1 is made of a substantially H-shaped soft magnetic conductor and has extended portions 1a to 1d't. The first and second fixed contact terminals 2 and 3 are fixed contacts 4a and 4bff, respectively.
In addition, each drawer part 2a, 3a is fixed to each end of the insulating lower casing 5 made of synthetic resin so that it protrudes outside of the insulating lower casing 5 ( The drawer portion 2a is not shown). Further, the neutral terminal 1 has a contact support part of the first fixed contact terminal 2 between the extension part 1a and the same lb, and a contact support part of the second fixed contact terminal 3 between the extension part 1c and the same ld. It is fixed to the lower casing 5 in such a manner. Note that the extension portions 1b and ld of the neutral terminal 1 each constitute a lead-out terminal for penetrating the lower casing 5 and electrically and mechanically connecting with the outside. Further, the armature 6 is made of a rectangular soft magnetic material and has a raised protrusion 6a that abuts the central flat portion of the neutral terminal 1. This protrusion 6a serves as a fulcrum for the tilting movement of the armature 6, and also serves as a fulcrum for the tilting movement of the armature 6.
4b is used to set a contact gap between the movable contact and a movable contact which will be described later. A thin plate-shaped hinge spring 7 made of a non-magnetic conductor is fixed to the upper surface of the armature 6 by welding or the like at a place marked with a tatami mark. Each end of the hinge spring 7 in the longitudinal direction is a twin-shaped movable contact spring portion 7a and a movable contact spring portion 7b. Movable contacts 8a and 8b, which selectively contact fixed contacts 4a and 4b, are fixed to the respective tips of movable contact spring parts 7a and 7b. The hinge spring 7 extends from the side surface in the width direction of the hinge spring and is bent to ensure the stability of the tilting movement of the armature 6 using the raised protrusion 6a as a fulcrum and to electrically connect it to the neutral terminal 1. A pair of movable arm parts 7c are joined by welding or the like at the points marked * in 1.
, 7c'. Further, the movable contact spring portions 7a and 7b of the hinge spring 7 are bent to provide sufficient contact force.

Permanent magnet 9 that provides a bias magnetic field for contact switching operation
is arranged above the first fixed contact terminal 2, and the permanent magnet 10 is arranged above the second fixed contact terminal 3. These permanent magnets 9 and 10 have magnetic poles, for example, as shown, and magnetize the first and second fixed contact terminals 2 and 3 to have the same polarity. By fixing the upper housing (lid) 11f made of synthetic resin or the like onto the open peripheral edge of the lower housing 5, the above-mentioned switching contact components can be housed in an airtight manner. Further, the joined upper housing 11 and lower housing 5 constitute a winding frame, and the excitation winding 12 is wound around this. Terminal 13 is a lead-out terminal of this excitation winding 12, and neutral terminal 1. first and second fixed contact terminals 2,
3 and are integrally molded into the lower housing 5. Excitation winding 12
A yoke 14, which forms part of the magnetic flux path, is attached to the winding edge and the bottom surface of the lower casing 5. Further, a protection cover 15 is attached to prevent damage to the casings 5 and 11 and the excitation winding 12.

Next, the operation of the self-holding electromagnetic relay shown in FIGS. 1 and 2 will be explained. For example, excitation winding 1
2 is not energized, the armature 6 is connected to the first fixed contact terminal 2 by the permanent magnet 9 that generates a bias magnetic field.
When the fixed contact 4a is attracted to and held magnetically, the fixed contact 4a
and the movable contact 8a are in contact with each other to form a path, that is, the neutral terminal 1-hinge spring 7-movable contact 8a-fixed contact 4
a- An electrical signal can be passed through the first fixed contact terminal 2. At this time, the fixed contact 4b and the movable contact 8b are in an open state. In this state, when a current is supplied to the excitation winding 12 in a direction that cancels the magnetic attraction force by the permanent magnet 9, the armature 6 tilts toward the second fixed contact terminal 3, and the fixed contact 4
The fixed contact 4a and the movable contact 8a are separated from each other at a portion where the movable contact 8b and the fixed contact 4a are in contact with each other. This allows electrical signals to pass between the neutral terminal 1 and the second fixed contact terminal 3. This contact state is maintained magnetically by the magnetic field generated from the permanent magnet 10 even when the excitation winding 12 is no longer energized. A switching operation from this state can be performed by energizing the excitation winding 12 in the opposite direction. Therefore, in the electromagnetic relay, the three switching contact sets perform contact opening/closing operations simultaneously.

As explained above, in the electromagnetic relay in which the contacts are switched by tilting the armature 6, the stiffness in the direction of rotation of the armature 6 is equal for both clockwise and counterclockwise rotations, and
It is desirable that the armature 6 be parallel to the neutral terminal 1 when no repulsive force is exerted on the magnetic attraction 9. Under these conditions, the current value can be made lowest and stable. However, in the conventional structure, the static posture of the armature 6 does not depend on the bending of the hinge spring 7 that supports the tilting movement of the armature, especially on the accuracy of step bending in the plate thickness direction;
is greatly affected by deformation during welding, making it difficult to make the relay current value characteristics uniform.

Furthermore, since the permanent magnets 9 and 10 are arranged on the outside of the upper part of the first and second fixed contact terminals 2 and 3 where the contacts face each other, the magnetic gap between the fixed contact terminals and the armature becomes longer.
A decrease in magnetic efficiency cannot be avoided. In order to compensate for this decrease in magnetic efficiency, it is necessary to increase the size of the permanent magnet, resulting in problems such as an increase in the size of the relay.

SUMMARY OF THE INVENTION An object of the present invention is to provide a transfer type electromagnetic relay in which a tilting armature is arranged in parallel to the neutral terminal with high accuracy, and the electric current value characteristics can be made uniform. ◇Another object of the invention is to provide a transfer type electromagnetic relay that is compact and has excellent magnetic efficiency by arranging a permanent magnet directly below the fixed contact terminal and within the contact pair. .

The transfer type electromagnetic relay according to the invention includes conductive first relays each having a lead-out portion passing through an insulating casing. Second
and a third terminal; the second and third terminals each having a protrusion that abuts on the upper surface of the first terminal, and each of which is disposed on both sides of the first terminal using the protrusion as a fulcrum. an armature made of a magnetic material that selectively tilts into contact with the second armature;
and a movable contact spring portion having a movable contact member that selectively contacts the fixed contact member provided on the third terminal, and a movable contact spring portion that is fixed to the upper surface of the protrusion provided on the first terminal and supports the tilting movement of the armature. an electrically conductive flat spring having an arm; a permanent magnet disposed near at least one of the second and third terminals and on the opposite side of the contact with the armature; an insulating lid constituting an airtight container for airtightly accommodating each of the members; the casing and the lid being wrapped around each other as a 41 frame, and the movable contact member of the flat spring by tilting the armature; The present invention is characterized by comprising: an excitation winding that makes selective contact with each of the fixed contact members of the second and third terminals.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 3 is a partially cutaway perspective view of an embodiment of a transfer type electromagnetic relay according to the invention. Also, the fourth
The figure is a diagram showing the configuration of the switching contact section in FIG. 3.

Referring to both figures, the extension parts 21a, 21b, 21C, 2
A neutral terminal 21 made of a substantially H-shaped non-magnetic conductor having a diameter of 1d, and fixed contacts 24a and 24b made of a soft magnetic conductor.
'eFixed first and second fixed contact terminals 22.23
and the respective drawer parts 21b', 21d', 22
', 23'(22' is omitted) are drawn out from the lower insulating casing 25 made of synthetic resin, and the first and second fixed contact terminals 22 and 23 are connected to the neutral terminal 2.
1 and fixed to the lower insulating casing 25 so as to be disposed on both sides of the housing.

Furthermore, it has an armature 26 made of a soft magnetic material with a protrusion 26a' at the lower center that contributes to setting the fulcrum of the tilting movement and the contact interval, and movable contacts 28a and 28b, and made of a non-magnetic conductor. A movable contact assembly is formed by fixing a hinge spring 27 in the form of a thin plate and a flat plate at the marked points by resistance or laser welding. The movable arm portion 27c of the hinge spring 27 faces the end portion of the hinge spring 27 such that the protrusion 26a of the bracket armature 26 abuts the central flat portion of the neutral terminal 21.

27c'' (r) The protruding pieces 21e and 21f arranged on the extension parts 21a and 21d sides of the neutral terminal 21 are fixed by welding or the like at the points marked with *.Here, the protruding pieces 2
1e and 21f are welded to the neutral terminal 21, and the height thereof is equal to the thickness of the armature 26. Thereby, the flat hinge spring 27 having the twin movable contact spring portions 27a, 27b can be arranged together with the armature 26 on the neutral terminal 21 in an initial parallel state. Furthermore, the permanent magnets 29 and 30 are arranged on the surface of the fixed contact terminals 22 and 23 opposite to the contact arrangement portions of the first and second fixed contact terminals 22 and 23 so as to magnetize them both to the same polarity. .23 and the armature 26 are located directly below the opposing portion thereof. With this arrangement, the length of the fixed contact terminal required for the conventional arrangement of permanent magnets can be completely shortened.

Correspondingly, the magnetic resistance between the terminals decreases.

In addition, the armature 26 and the first and second fixed contact terminals 22
．． Since the permanent magnets 29 and 30 approach the opposing magnetic gap portions of the magnets 23, leakage magnetic flux is reduced and magnetic efficiency can be improved, so that the permanent magnets can be made smaller. Note that by fixing the upper insulating casing (lid) 31f made of synthetic resin onto the open peripheral edge of the lower insulating casing 25, the above-mentioned contact component I is airtightly accommodated, and the winding frame is Configure. An excitation winding a32 is wound around this. In Fig. 3, reference numeral 32'
is the winding terminal. Further, a yoke 33 is attached to the upper part of the upper insulating casing 31 to form a magnetic flux path. Finally, the protective cover 34 is attached to the relay to complete the transfer type electromagnetic relay ◇Although the relay of the above-mentioned embodiment is a self-holding type that switches both contacts using two permanent magnets, one of the permanent magnets If the arrangement is omitted, it can be changed to a monostable self-holding type, and the basic switching operation of these relays is the same as the conventional one described above.

In the above embodiment, the protruding pieces 21e and 2 are attached to the neutral terminal 21.
For example, as shown in FIG. 5, the extension part of the neutral terminal 21' may be pressed to protrude to form a protrusion 21e' l 21 f"e, as shown in FIG. 6. The neutral terminal 21'' provided at the protrusion 21e'+21f'' can also be formed by punching out a strip 40 having an irregular cross-section into a predetermined shape along the dashed-dotted line. Here, the position of these protrusions provided on the neutral terminal can be similarly implemented whether it is on the diagonal part of the central flat part or on any of the extension parts, and can be arbitrarily set depending on the shape of the hinge spring and the shape of the protrusion. You can choose.

As explained above, according to the present invention, a protrusion is provided at a predetermined position of the neutral terminal, and the movable arm of the hinge spring to which the armature is fixed is fixed by the protrusion.
The neutral position of the armature can be accurately set parallel to the neutral terminal by using a hinge spring with a flat shape without stepped edges, making it easy to match the magnetic attraction force with the spring load characteristics. The spring load is small and low. Therefore, there is a need for a transfer type electromagnetic relay that has a low current value and stable current characteristics.

Further, according to the present invention, by arranging the permanent magnet directly under the fixed contact terminal and within the inner range of the contact pair, a small transfer type electromagnetic relay having excellent magnetic efficiency can be obtained.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view showing an example of a conventional transfer type electromagnetic relay, Fig. 2 is a diagram showing the configuration of the switching contact section in Fig. 1, and Fig. 3 is an example of a transfer type electromagnetic relay according to the invention. A partially cutaway perspective view showing the embodiment, Figures 81 and 4 are diagrams showing the configuration of the switching contact portion in the same embodiment, and Figures 5 and 6 are perspective views showing other configuration examples of the neutral terminal in the invention. It is. 21.21', 21"...neutral terminal, 21 a~
21 d--Extension section, 21e, 21f t21e'
, 21f', 21e". 21f"...Protrusion, 22, 23...First and second fixed contact terminals, 24a, 24b...
...Fixed contact, 25...Lower housing, 26...
Armature, 26a... Protuberance, 27...
・Hinge spring, 27a, 27b・ Movable contact spring part, 2
7c, 27c' -=-・Movable arm part, 28a, 28
b...,...Movable contact, 29, 30 Permanent magnet, 31...Pa upper casing, 32...Excitation winding, 3
3...Yoke, 34...Cover. l゛: ＼ Agent Patent Attorney Susumu Uchihara 117.゛ノ(n)

Claims (1)

[Claims] conductive first tubes each having a lead-out portion extending through the insulating housing; The second and third terminals and the raised protrusions abut on the upper surface of the first terminal, and the second and third terminals are arranged on both sides of the first terminal, respectively, using this protrusion as a fulcrum. an armature made of a magnetic material that makes selective tilting contact with the terminal; disposed on the armature, and selected as a fixed contact member provided at the second and third terminals according to the tilting of the armature; a conductive flat spring having a movable contact spring portion having a movable contact member in contact with the first terminal; and a movable arm portion fixed to the upper surface of a protrusion provided on the first terminal and supporting tilting of the armature; a permanent magnet disposed near at least one of the second and third terminals and on the opposite side of contact with the armature; and a permanent magnet that is joined on the housing to form an open container that airtightly accommodates each of the members. an insulating lid body that is wound with the housing and the lid shell as a winding frame, and tilts the armature to fix each of the movable contact member of the flat spring and the second and third terminals; A transfer type electromagnetic relay comprising an excitation winding that makes selective contact with a contact member.