JPH03222230A - Electromagnetic relay - Google Patents

Abstract

PURPOSE:To maintain the contact stability of contacts to make the contact difficult to deteriorated even when a large load is opened and closed by interposing movable contacts in the middle so as to face a fixed contact provided on a fixed contact plate for contacting with the movable contacts, and providing a second fixed contact contacting the movable contacts. CONSTITUTION:Movable contacts 3, 11 and 4, 12 are interposed in the middle, and second fixed contacts 13 and 14 contacting with the movable contacts 11 and 12 are provided on fixed contact terminal boards 13a and 14a so as to face fixed contacts 5 and 6. The excitation of an electromagnet causes an armature 1 to make a seesaw motion with the middle part 1c as a supporting point to make a movable spring 2 to react the seesaw motion. That is, the movable contacts 3 and 12 open to the fixed contacts 5 and 14, the movable contacts 11 and 4 are circuit-closed to the fixed contacts 13 and 6, and a space A-C becomes a conductive condition with parallel circuits of A - movable contact 11 - C and A - movable contact 4 - C. This can maintain the contact stability of the contacts likewise a twin contact to obtain a seesaw method electromagnetic relay in which the contact is difficult to deteriorate even at the time of opening and closing a relatively large load.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is characterized in that the armature is rotatably supported at its center and alternately angularly displaced at both ends by 1i magnets in a seesaw motion. , concerning the so-called seesaw two electromagnetic relay.

[Prior Art] As a conventional seesaw II IIT magnetic relay, there is one having the following structure, which will be explained based on FIGS. 3 and 4. However, although this electromagnetic relay is for two poles, as can be seen from Figures 1 and 3, the armature 1 described below
It is symmetrical with respect to , and each side constitutes one of the two poles, so it has a multipolar 8! The functions and constituent parts are exactly the same except for common parts. Therefore, in the following explanation, only one pole will be described except for common parts.

Reference numeral 1 denotes an armature, which is made of a magnetic material such as electromagnetic soft iron and has a flat plate shape, and a holding portion 1d made of an insulating material such as synthetic resin is provided in the middle of the armature.

A movable spring 2, which will be described later, is arranged in parallel to this armature 1, and its intermediate portion is attached to the holding portion 1d.

Moreover, this armature 1 is housed in a device stand 10, which will be described later! By rotatably supporting the central portion 1c by a magnet and moving it appropriately, both end portions 1a and lb are angularly displaced with the central portion 1c as a fulcrum in a seesaw motion.

Therefore, the movable spring 2 arranged in parallel to the armature 1 as described above also seesaws.

Reference numeral 2 denotes a movable spring, which is made of a spring material such as phosphor bronze, and as described above, its intermediate portion is attached to the intermediate portion of the armature I by a holding portion 1d. The spring portion led out from the holding portion 1d is bifurcated from the middle, and a movable contact is provided at the tip end of the spring portion. In other words, two movable contacts 3 and 2 are provided at both ends 2a and 2b of the movable spring 2, respectively.
3 and movable contacts 4, 4 are provided, forming so-called twin contacts. Further, a connecting piece 2c extending from the intermediate portion of the movable spring 2 is led out from the holding part 1d in a direction perpendicular to the direction in which the spring part is led out from the holding part 1d.

5.6 is a fixed contact, and a fixed contact terminal plate 5a is arranged so that the movable contact 3.3 and the movable contacts 4, 4 are connected to and separated from each other.
, 6a.

7 is a common terminal plate to which the connecting piece 2c of the movable spring 2 is fixed.

8.9 are coil terminal plates, each of which has two terminal plates, and is connected to the beginning and end of the winding of the coil that constitutes the electromagnet. Normally, one of 8.9 is used, but if the electromagnet is bistable and has two coils, both are used.

Reference numeral 10 denotes a table, which is made of an insulating material such as synthetic resin and has a box-like shape with an open end. An electromagnet for driving the armature 1 disposed on the opening side is housed inside. Furthermore, the fixed contact terminal plates 5a+6a and the common terminal plate 7 protrude from the inside of the side wall parallel to the armature 1. Together with the coil terminal plates 8 and 9, each terminal plate extends -1 inside this side wall, and its external connection portions are led out from the bottom surface of the device stand 10 in a line and at equal pitches.

Next, the operation will be explained based on FIG. In the same figure,
A, B, and C are points on the circuit, and A is connected to the fixed contact terminal plate 6a, B is connected to the fixed contact terminal plate 5a, and C is connected to the common terminal plate 7, respectively. Assume that the electromagnet is in the state shown in FIG. 2(a) when not energized. That is, the movable contact 3.3 is closed to the fixed contact 5, the movable contact 4.4 is separated from the fixed contact 6, and the circuit B-C is in a conductive state. Here, when the electromagnet is excited, the armature 1 makes a see-saw movement with the central portion 1c as a fulcrum as described above, and the movable spring 2 also responds to the see-saw movement as shown in the same figure (b).
becomes the state of In other words, the movable contact 3.3 opens and separates from the fixed contact 5, the movable contact 4.4 closes to the fixed contact 6, and A
-C circuit becomes conductive.

[Problem to be solved by the invention]

In the conventional IIM relay described above, the movable contacts 3.
3 and the movable contact 4.4 are so-called twin contacts, and the movable contact contacts the fixed contact at two places, which is an excellent means for obtaining contact stability of the contact.

However, in order to achieve the same contact pressure as a single contact,
The contact pressure of each twin contact should be approximately half that of a single contact. In addition, it is extremely rare for each of the twin contacts to connect and disconnect from the fixed contact at exactly the same time, so when switching a relatively large load, it is necessary to open and close only the contact that is closer to the fixed contact among the twins. Become. Therefore, as the contact itself deteriorates, the arc generated there will also affect the other twin contact nearby and roughen the contact surface, resulting in increased heat generation when the contact closes. It will get bigger and have a shorter lifespan.

The present invention has been made in view of the above-mentioned reasons, and its purpose is to maintain the contact stability of the contacts in a so-called seesaw one-way type electromagnetic relay in the same way as twin contacts, and to maintain the contact stability under relatively large loads. The purpose of this invention is to realize an electromagnetic relay in which contact deterioration is unlikely to occur even when opening and closing.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the electromagnetic relay of the present invention has an armature whose central part is rotatably supported and whose ends are alternately angularly displaced by electromagnets as if moving in a seesaw manner. and,
The intermediate part is attached to the intermediate part of the armature, and includes a movable spring arranged in parallel to the armature, a movable contact provided at both ends of the movable spring, and a fixed contact provided on a fixed contact plate so as to come into contact with and separate from the movable contact. In the electromagnetic relay, the electromagnetic relay has a structure in which the movable contact is interposed in the middle, and a second fixed contact that contacts and separates from the movable contact is attached so as to face the fixed contact.

[Operation] According to the present invention, in a so-called see-saw single-type electromagnetic relay, conduction of the contacts can be realized by a parallel circuit of a single contact, so the contact stability of the contacts can be maintained in the same way as with twin contacts, and moreover, compared to This electromagnetic relay is resistant to contact deterioration even when switching and opening large loads.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Note that members that are substantially the same as those in the conventional example are given the same reference numerals, and only the differences from the conventional example will be described below.

The difference from the conventional example is the structure of the movable spring and the contact point.

In the movable spring 2, the spring part led out from the holding part 1d does not have a twin contact structure in which it is split into two from the middle as in the conventional example, but has one movable contact on the front and back sides of the spring at its tip. It has a single contact structure. In other words, the movable contacts 3.11 are located on the front and back of both ends 2a and 2b of the movable spring 2.
and a movable contact 4.12, which movable contact 3
．． 4 is a fixed contact 5.6 provided on the fixed contact terminal plate 5a6a
It is designed to come into contact with and separate from it.

Then, the movable contact 3.11 and the movable contacts 4, 12 are interposed between them, and the second fixed contact 13.14, which contacts and separates from the movable contact LL12, is arranged on a fixed contact terminal plate so as to face the fixed contacts 5, 6. It is attached to L3a and 14a.

The fixed contact terminal plates 13a and 14a are connected to the fixed contact 1 from the middle.
3 and 14, and extends inside the side wall of the holder 10 that is perpendicular to the armature 1, and its external connection portion is led out from the bottom surface of the holder 10.

Next, the operation will be explained based on FIG. In the same figure,
A, B, and C are points on the circuit; A is the fixed contact terminal plate 6a and 13a, and B is the fixed contact terminal plate 5a and 14a.
and C are connected to the common terminal board 7, respectively. Assume that the electromagnet is in the state shown in FIG. 2(a) when not energized. In other words, the movable contact 3.12 is closed to the fixed contact 5.14, the movable contacts 11, 4 are separated from the fixed contact 13.6, and the distance between B-C is between B-movable contact 3-C and B- It is in a conductive state due to the parallel circuit of the movable contact 12-C. Here, when the electromagnet is excited, the armature 1 is
By performing a see-saw movement with the central portion 1c as a fulcrum, the movable spring 2 also responds to the see-saw movement and enters the state shown in FIG. 3(b). That is, the movable contact 3.12 opens and closes to the fixed contact 5.14, the movable contact 11.4 closes to the fixed contact 13.6, and the distance between ^-C and movable contact 11-C and A- The parallel circuit of the movable contact 4-C brings it into conduction.

As can be seen from the above, regarding conduction between B and C and between A and C, the same function as the twin contacts in the conventional example is achieved.
This can be realized by a parallel circuit with a single contact. Therefore, the contact stability of the contacts can be maintained similar to that of twin contacts.

Furthermore, since it is a single contact, the shape and contact pressure of the movable contact can be made larger than that of twin contacts, so it is also possible to open and close relatively large loads. Moreover, even if there is a difference between the parallel circuits in the timing at which the movable contact contacts and separates from the fixed contact, and only one contact opens or closes, the positions of both contacts are located at both ends of the movable spring 2 and are separated. Therefore, unlike in the case of twin contacts, the arc generated from one opening/closing contact does not affect the other contact and roughen the contact surface, making it difficult for the contact to deteriorate1! Magnetic relays can be provided.

In addition, in this example, to configure the parallel circuit,
Although the case is shown in which the external connection portions of each terminal board led out from the bottom of the device stand 10 are connected, it is also possible to realize this inside the ill relay.

Further, in this embodiment, only the case where the movable contact is a single contact has been described, but the effect when the above-mentioned parallel circuit is constructed using a twin contact structure is as follows.

In other words, since there are two pairs of twin movable contacts, that is, four movable contacts contact and separate from the fixed contact in parallel, the contact stability of the contacts is even better than the conventional one-pair twin contact structure. Become something. Even when opening and closing a relatively large load, these two pairs of movable contacts are provided at both ends of the movable spring, so the arc generated from one contact will not affect the other contact. Moreover, since the volume of the movable contacts is twice that of a pair of movable contacts, it can withstand a larger load.

〔Effect of the invention〕

Since the present invention has the bottom as described above, in a so-called seesaw type electromagnetic relay, conduction of the contacts can be realized by a parallel circuit of a single contact, so that the contact stability of the contacts can be maintained in the same way as with twin contacts. Furthermore, it is possible to provide an electromagnetic relay whose contacts are unlikely to deteriorate even when switching a relatively large load.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing an embodiment of the present invention.
FIG. 3 is a perspective view of the conventional example. FIG. 4 is an explanatory diagram of the same operation. 1- Armature, la, 1b--one both ends, 1c-center, 1d-holding part, 2-movable spring, 2a, 2b--one both ends, 20m connecting piece, 3.4, 11.
12--one movable contact, 5.6.13.14-m-fixed contact (13 and 14 are the second
Fixed contacts) 5a, 6a, 13a, 14a -- Fixed contact terminal board, 7- Common terminal board, 8.9- Coil terminal board, 10- Device stand.

Claims (1)

[Claims] (1) An armature whose central part is rotatably supported and whose both ends alternately angularly displace as if moving in a seesaw motion by an electromagnet, and a movable spring whose intermediate part is attached to the intermediate part of the armature and arranged in parallel to the armature; An electromagnetic relay comprising a movable contact provided at both ends of a movable spring, and a fixed contact provided on a fixed contact plate so as to make contact with and separate from the movable contact, with the movable contact interposed in the middle, and a fixed contact provided in contact with the movable contact. An electromagnetic relay characterized in that a second fixed contact to be separated is attached to face the fixed contact.