JP2008041481A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay capable of suppressing contact failure due to arc discharge generated by a high-capacity load at low costs. <P>SOLUTION: The electromagnetic relay comprises: an insulator substrate 14 where a fixed contact terminal 11 having a fixed contact 10 is provided, a coil assembly 18 having a coil 16 mounted on the insulator substrate 14, and an armature assembly 17 having a movable contact spring 3 having a pair of movable contacts 1 that is brought into contact with or is separated from the fixed contact 10 by performing seesaw operation by the circulation control of current to the coil 16 while being mounted to the coil assembly 18. In the electromagnetic relay, a fixed contact 20 in the same shape as the fixed contact 10, and a pair of movable contacts 21 in the same shape as the pair of movable contacts 1 are installed adjacent to the fixed contact 10 and the pair of movable contacts 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates generally to electromagnetic relays used in communication and control equipment.

  Electromagnetic relays are widely used in the fields of communication equipment, automobile electrical components and household electrical products, and in general, the contact part is manufactured with a mold as described later in order to ensure the contact reliability. Chip contacts are used.

  The structure of the conventional electromagnetic relay is shown by patent document 1, and an example of the structure is shown in FIG. FIG. 4A is an exploded perspective view of the entire electromagnetic relay, and FIG. 4B is an enlarged perspective view of a movable contact and a fixed contact portion.

  4A, the electromagnetic relay is configured by mounting a coil assembly 18 and an armature assembly 17 on an insulator base 14, and covering a cover 15 over the entire assembly. The coil assembly 18 includes a U-shaped iron core 6 around which the coil 16 is wound, a permanent magnet 9 disposed so that one magnetic pole is in contact with the central portion of the U-shaped iron core 6, and the permanent magnet 9 and the U-shaped core. A coil spool 8 for integrally fixing the iron core 6 is provided. The armature assembly 17 is disposed so that both ends thereof are opposed to both ends of the U-shaped iron core 6, and the center portion thereof is disposed on the other magnetic pole of the permanent magnet 9 to serve as a fulcrum. The armature 4 that enables the seesaw operation to contact and separate both ends of the character-shaped iron core 6, the hinge spring 2 that supports the seesaw motion of the armature 4, and the movable that interlocks with the seesaw operation of the armature 4 A contact spring 3 is provided, which are integrally fixed by an insulating fixing body 5. The movable contact spring 3 is separated into two before the tip, and a movable contact pair 1 is provided at the tip.

  The insulator base 14 has a box shape with an opening at the top, a coil assembly 18 is disposed in the opening, and the permanent magnet 9 is supported on the seesaw operation of the armature 4 on the permanent magnet 9 as described above. When the armature assembly 17 is arranged so as to be, a fixed contact holding a fixed contact 10 similar to the shape obtained by vertically cutting a cylinder at a position facing the movable contact pair 1 of the movable contact spring 3 A terminal 11 is implanted, and a neutral terminal 12 and a coil lead-out terminal 13 connected to one end of the hinge spring 2 are implanted. After the coil assembly 18 and the armature assembly 17 are installed and assembled on the insulator base 14, the cover 15 is placed on the insulator base 14, and the gap between the cover 15 and the insulator base 14 is sealed. Sealed and fixed with an agent.

  The electromagnetic relay includes two contact points, a contact system composed of fixed contacts 10a and 10b and movable contacts 1a and 1b, and a contact system composed of fixed contacts 10c and 10d and movable contacts 1c and 1d.

JP-A-5-314882

  In this conventional electromagnetic relay, the movable contact pair 1 and the fixed contact 10 facing each other as shown in FIG. In some cases, arc discharge may occur. Due to the heat generated by the arc discharge, the contact becomes hot, and the heat causes a part of the movable contact pair 1 and the fixed contact 10 to melt, resulting in a failure in which the contact cannot be opened and closed. There is a case.

  In order to suppress the melting of the contact due to such arc discharge, it is conceivable to increase the volume of the movable contact pair 1 and the fixed contact 10 and increase the heat capacity of the contact to reduce the temperature rise during the arc discharge. However, in order to change the tip shape of such a contact, it is necessary to prepare a new contact manufacturing die, which increases costs.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic relay capable of reducing contact failure due to arc discharge generated by a high-capacity load at a low cost.

  In order to solve the above problems, an electromagnetic relay according to the present invention comprises an insulator base provided with a fixed contact terminal having a fixed contact, a coil assembly having a coil mounted on the insulating base, and the coil assembly. And an armature assembly including a movable contact spring having a pair of movable contacts that are mounted in a three-dimensional structure and perform a seesaw operation by controlling the current flow to the coil to be brought into contact with and separated from the fixed contact. In the electromagnetic relay, a fixed contact having the same shape as the fixed contact or a movable contact pair having the same shape as the movable contact pair is disposed adjacent to at least one of the fixed contact or the movable contact pair.

  Further, one or a plurality of fixed contacts having the same shape as the fixed contact may be provided adjacent to the fixed contact.

  One or a plurality of movable contact pairs having the same shape as the movable contact pair may be provided adjacent to the movable contact pair.

  In addition, one or a plurality of fixed contacts having the same shape as the fixed contact and one or more movable contact pairs having the same shape as the movable contact pair may be provided adjacent to the fixed contact and the movable contact pair, respectively. .

  The coil assembly includes a U-shaped iron core wound with a coil, a permanent magnet disposed so that one magnetic pole is in contact with a central portion of the U-shaped iron core, the permanent magnet, and the U-shaped iron core. The seesaw assembly includes a fixed coil spool, and the armature assembly includes a seesaw whose central portion is disposed on the other magnetic pole of the permanent magnet and serves as a fulcrum and whose both ends are in contact with and separated from both ends of the U-shaped iron core. The armature includes an armature that can be operated, a hinge spring portion that supports the seesaw operation of the armature, and a movable contact spring that is linked to the seesaw operation of the armature. The insulator base may have a box shape with an open top, and may be configured by implanting the fixed contact terminal and a neutral terminal connected to one end of the hinge spring portion. .

  In the present invention, as described above, a fixed contact or a movable contact pair having the same shape as the fixed contact is installed adjacent to the fixed contact or the movable contact pair. The volume can be obtained, the heat capacity of the contact can be increased, the temperature rise due to arc discharge at the time of high capacity load can be suppressed, and the contact switching failure can be avoided.

  Further, by using contacts having the same shape, an electromagnetic relay capable of suppressing contact failure due to arc discharge at a high cost load without a new contact manufacturing die is obtained.

  Hereinafter, embodiments of the present invention will be described based on examples.

  FIG. 1 is a view showing a first embodiment of an electromagnetic relay according to the present invention, FIG. 1 (a) is an exploded perspective view of the whole electromagnetic relay, and FIG. 1 (b) is a movable contact and fixed of the electromagnetic relay. It is an expansion perspective view of a contact part.

  As shown in FIG. 1A, the electromagnetic relay of this embodiment includes an insulator base 14 provided with a fixed contact terminal 11 having a fixed contact 10, and a coil mounted on the insulation base 14. 16 and a movable contact pair having a movable contact pair 1 that is mounted on the coil assembly 18 and is contacted / separated with respect to the fixed contact 10 by performing a seesaw operation by controlling current flow to the coil 16. In an electromagnetic relay including an armature assembly 17 including a spring 3, the fixed contact 20 and the movable contact pair 1 having the same shape as the fixed contact 10 are adjacent to the fixed contact 10 and the movable contact pair 1, respectively. Each of the movable contact pairs 21 having a shape is installed.

  The coil assembly 18 includes a U-shaped iron core 6 around which the coil 16 is wound, and a permanent magnet 9, a permanent magnet 9, and a U-shaped iron core 6 arranged so that one magnetic pole contacts the central portion of the U-shaped iron core 6. The armature assembly 17 is disposed on the other magnetic pole of the permanent magnet 9 as a fulcrum, and both end portions are in contact with both end portions of the U-shaped iron core 6. The armature 4 that enables the seesaw operation to be separated, the hinge spring 2 that supports the seesaw operation of the armature 4, and the movable contact spring 3 that interlocks with the seesaw operation of the armature 4, and Are integrally fixed by the insulating fixing body 5, and the insulating base 14 has a box shape with an open top, and a neutral terminal 12 and a coil lead-out terminal connected to the fixed contact terminal 11 and one end of the hinge spring 2. 13 have been planted . After the coil assembly 18 and the armature assembly 17 are installed and assembled on the insulator base 14, the cover 15 is placed on the insulator base 14, and the gap between the cover 15 and the insulator base 14 is sealed. Sealed and fixed with an agent.

  The operation principle of the seesaw operation of the armature 4 of the electromagnetic relay of this embodiment will be described with reference to FIG. FIG. 5 schematically shows the configuration of the U-shaped iron core 6, the coil 16, the permanent magnet 9, and the armature 4. In the initial state of FIG. 5A, the central portion 4a of the armature 4 is disposed on the N magnetic pole of the permanent magnet 9 so as to be a fulcrum for seesaw operation, and one end of the armature 4 has a U-shaped iron core. 6 is magnetically attached to one end. At this time, the magnetic flux Φ 1 generated from the permanent magnet passes through the closed magnetic path of the permanent magnet 9 -the armature 4 -the U-shaped iron core 6. Now, as shown in FIG. 5B, when the coil 16 is excited in the direction to cancel out the magnetic flux Φ1, the magnetic flux Φ0 from the coil 16 begins to flow to the open end side of the armature 4 as well. Starts the seesaw operation. At this time, since the magnetic flux Φ0 from the coil 16 and the magnetic flux Φ1 ′ from the permanent magnet 9 are added in the same direction on the open end side of the armature 4, the open end as shown in FIG. Is closed, and the seesaw operation in one direction is completed. Further, when a reverse current is passed through the coil 16, the initial state shown in FIG.

  In the operation of the conventional relay, as shown in FIG. 4 (b), when a high-capacity load is opened and closed at the movable contact pair 1 and the fixed contact 10 facing each other, arc discharge occurs, and the movable contact pair 1 The temperature of the fixed contact 10 rises. Due to this heat, the movable contact pair 1 and the fixed contact 10 are welded to cause a problem that the contact cannot be opened and closed.

  However, in this embodiment, as shown in FIG. 1B, by arranging two rows of movable contacts and fixed contacts having the same shape as the conventional one, the contact volume is doubled on both the movable side and the fixed side. be able to. For this reason, the temperature rise of the contact can be suppressed, melting of the contact can be avoided, and contact failure can be suppressed. As a result, it is possible to open and close a load having a higher capacity than before.

  In addition, since the individual shapes of the movable contact pair 1 and the fixed contact 10 according to the embodiment of the present invention are the same as those in the conventional art, it is not necessary to produce a new contact manufacturing mold, so that the cost increase is small. Note that the fixed contact 20 and the movable contact pair 21 added in the present embodiment can have a current-carrying function as a contact, but this is not essential, and only a heat-dissipating function suitable for the purpose of the present invention is provided. Can be arranged.

  FIG. 2 is a diagram showing a second embodiment of the electromagnetic relay according to the present invention, FIG. 2A is an exploded perspective view of the entire electromagnetic relay of this embodiment, and FIG. It is an expansion perspective view of the movable contact and fixed contact part of a relay.

  The structure other than the contact portion of the electromagnetic relay of this embodiment is the same as that of the conventional electromagnetic relay shown in FIG. However, in this embodiment, as shown in FIG. 2B, the fixed contact 10 is the same as the conventional configuration, but a movable contact pair having the same shape as the movable contact pair 1 is adjacent to the movable contact pair 1. 21 is installed. Also in this case, the temperature of the contact can be prevented from rising by doubling the volume of the movable contact compared to the conventional one, and the melting of the contact can be avoided. The added movable contact pair 21 does not contribute to energization and has only a heat radiation function.

  FIG. 3 is a view showing a third embodiment of the electromagnetic relay according to the present invention, FIG. 3A is an exploded perspective view of the whole electromagnetic relay of this embodiment, and FIG. It is an expansion perspective view of a movable contact and a fixed contact part.

  The structure other than the contact portion of the electromagnetic relay of this embodiment is the same as that of the conventional electromagnetic relay shown in FIG. However, in this embodiment, as shown in FIG. 3B, the movable contact pair 1 is the same as the conventional configuration, but the fixed contact 20 having the same shape as the fixed contact 10 is adjacent to the fixed contact 10. is set up. Also in this case, the temperature increase of the contact can be suppressed by avoiding the melting of the contact by doubling the volume of the fixed contact as compared with the conventional case. The fixed contact 20 of this embodiment also has only a heat dissipation function.

  Needless to say, the present invention is not limited to the above embodiment, and the number of movable contact pairs and fixed contacts having the same shape installed adjacent to the fixed contact and movable contact pairs is two. It may be the above. Further, the additional contact position may be a position where heat generated by arc discharge is conducted, and may be disposed in contact with a conventional contact point. Moreover, if it is a movable contact, you may install in the upper part on both sides of the movable contact spring 3. As shown in FIG. Further, the coil assembly and the armature assembly are not limited to the above-described embodiments, and any structure may be used as long as it is an electromagnetic drive structure capable of seesaw operation of the armature.

The figure which shows the 1st Example of the electromagnetic relay by this invention, FIG. 1 (a) is an exploded perspective view of the whole electromagnetic relay, FIG.1 (b) is an expansion perspective view of the movable contact and fixed contact part of an electromagnetic relay. The figure which shows the 2nd Example of the electromagnetic relay by this invention, FIG. 2 (a) is a disassembled perspective view of the whole electromagnetic relay, FIG.2 (b) is an expansion perspective view of the movable contact and fixed contact part of an electromagnetic relay. The figure which shows the 3rd Example of the electromagnetic relay by this invention, FIG. 3 (a) is a disassembled perspective view of the whole electromagnetic relay, FIG.3 (b) is an expansion perspective view of the movable contact and fixed contact part of an electromagnetic relay. The figure which shows an example of the structure of the conventional electromagnetic relay, FIG. 4 (a) is an exploded perspective view of the whole electromagnetic relay, FIG.4 (b) is an expansion perspective view of a movable contact and a fixed contact part. Explanatory drawing of operation | movement of the electromagnetic relay of this invention, The figure which shows typically the structure of a U-shaped iron core, a coil, a permanent magnet, and an armature.

Explanation of symbols

1, 21 Movable contact pair 1a, 1b, 1c, 1d Movable contact 2 Hinge spring 3 Movable contact spring 4 Armature 4a Center part 5 Insulating fixed body 6 U-shaped iron core 7 Coil terminal 8 Coil spool 9 Permanent magnets 10, 10a, 10b , 10c, 10d, 20 Fixed contact 11 Fixed contact terminal 12 Neutral terminal 13 Coil lead-out terminal 14 Insulator base 15 Cover 16 Coil 17 Armature assembly 18 Coil assembly

Claims (5)

  By an insulator base having a fixed contact terminal having a fixed contact, a coil assembly having a coil mounted on the insulating base, and a current flow control to the coil mounted on the coil assembly An electromagnetic relay comprising an armature assembly including a movable contact spring having a pair of movable contacts that are brought into contact with and separated from the fixed contact by performing a seesaw operation, the fixed contact or the movable contact pair An electromagnetic relay, wherein a fixed contact having the same shape as the fixed contact or a movable contact pair having the same shape as the movable contact pair is installed adjacent to at least one of the first and second contacts.   The electromagnetic relay according to claim 1, wherein one or a plurality of fixed contacts having the same shape as the fixed contacts are provided adjacent to the fixed contacts.   2. The electromagnetic relay according to claim 1, wherein one or a plurality of movable contact pairs having the same shape as the movable contact pair are provided adjacent to the movable contact pair.   One or a plurality of fixed contacts having the same shape as the fixed contact and one or more movable contact pairs having the same shape as the movable contact pair are provided adjacent to the fixed contact and the movable contact pair, respectively. The electromagnetic relay according to claim 1.   The coil assembly integrally fixes a U-shaped iron core around which a coil is wound, a permanent magnet disposed so that one magnetic pole is in contact with a central portion of the U-shaped iron core, the permanent magnet, and the U-shaped iron core. A coil spool, and the armature assembly performs a seesaw operation in which a central portion is disposed on the other magnetic pole of the permanent magnet and serves as a fulcrum, and both end portions contact and separate from both end portions of the U-shaped iron core. An armature that can be performed, a hinge spring portion that supports a seesaw operation of the armature, and a movable contact spring that interlocks with the seesaw operation of the armature, and these are integrally fixed by an insulating fixing body. The insulator base has a box shape with an opening at the top, and is constructed by implanting the fixed contact terminal and a neutral terminal connected to one end of the hinge spring portion. Claims The electromagnetic relay according to any one of 4.

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