JP2013080692A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an electromagnetic relay capable of restraining impairing of reliability of a contact point.SOLUTION: An electromagnetic relay 1 comprises: an armature 16 swung by excitation and non-excitation of an electromagnetic block 10; a movable contact part 21 having a movable contact point 21a, mounted to the armature 16 and swinging together with swing of the armature 16; and a stationary contact part 22 having a stationary contact point 22a to and from which the movable contact point 21a approaches and is separated. The electromagnetic relay 1 is provided with magnetic field generation means 50 for forming an arc extension space S for extending an arc generated when the movable contact point 21a approaches to and is separated from the stationary contact point 22a on the electromagnetic relay 1, and for introducing the arc generated when the movable contact point 21a approaches to and is separated from the stationary contact point 22a to the arc extension space S.

Description

  The present invention relates to an electromagnetic relay.

  Conventionally, as an electromagnetic relay, an armature that oscillates by excitation and de-energization of an electromagnet block and a movable contact, a movable contact that oscillates as the armature oscillates, and a fixed contact that moves and separates the movable contact What is provided with the fixed contact part which has a contact is known (for example, refer patent document 1).

JP 2010-123545 A

  However, in the conventional electromagnetic relay, for example, when a high DC voltage of 400 V is applied to the electromagnetic relay, there is a problem in that an arc generated when the movable contact and the fixed contact come in and out cannot be interrupted. It was. As described above, when the generated arc cannot be interrupted, the movable contact and the fixed contact are welded by the arc, and the reliability of the contact may be impaired.

  Then, an object of this invention is to obtain the electromagnetic relay which can suppress that the reliability of a contact is impaired.

  A first feature of the present invention is a movable armature that has an armature that swings by excitation and non-excitation of an electromagnet block, and a movable contact, and that swings as the armature swings, attached to the armature. An electromagnetic relay comprising a contact portion and a fixed contact portion having a fixed contact with which the movable contact contacts and separates, wherein the electromagnetic relay has an arc generated when the movable contact and the fixed contact are contacted and separated An arc extension space for extending the arc is formed, and magnetic field generating means for guiding an arc generated when the movable contact and the fixed contact come into contact with and separated from the arc extension space is provided.

  The gist of the second feature of the present invention is that an arc extinguishing portion is provided in the arc extension space.

  According to a third feature of the present invention, the movable contact includes a first extending piece extending from the armature toward one end, and a first extending piece from the tip of the first extending piece. A second extending piece extending in a tolerance direction; and a third extending piece extending from the tip end of the second extending piece to the other end side, and the third extending piece. The gist is that the movable contact is formed on the extended piece.

  According to a fourth aspect of the present invention, the arc extension space is defined by a wall, and an opening into which the third extending piece can be inserted is formed below the wall. It is a summary.

  The fifth feature of the present invention is summarized in that a separation wall for dividing the arc extension space is provided.

  The sixth feature of the present invention is summarized in that an uneven portion is provided on a wall surface facing the arc extension space.

  The seventh feature of the present invention is summarized in that the uneven portion is formed along the extending direction of the arc.

  According to the present invention, the electromagnetic relay is formed with an arc extension space for extending an arc generated when the movable contact and the fixed contact come in contact with and away from each other. Furthermore, the electromagnetic relay is provided with a magnetic field generating means for guiding an arc generated when the movable contact and the fixed contact come into contact with and separated from each other to the arc extension space. With such a configuration, an arc generated when the movable contact and the fixed contact are brought into contact with and separated from each other can be more reliably interrupted, so that the reliability of the contact can be prevented from being impaired.

It is a front view which shows the electromagnetic relay concerning 1st Embodiment of this invention. It is a perspective view which shows the cover of the electromagnetic relay concerning 1st Embodiment of this invention. It is a perspective view which shows the state which removed the cover of the electromagnetic relay concerning 1st Embodiment of this invention. It is AA sectional drawing of FIG. FIG. 4 is a perspective view showing a state in which a part of the magnetic breaking yoke and the arc extinguishing part of FIG. 3 are removed. It is the figure which removed a part of electromagnetic relay concerning a 1st embodiment of the present invention, and is a perspective view showing a movable contact part and a fixed contact part. It is BB sectional drawing of FIG. It is a longitudinal cross-sectional view of the electromagnetic relay concerning 2nd Embodiment of this invention. It is a longitudinal cross-sectional view of the electromagnetic relay concerning 3rd Embodiment of this invention. It is a longitudinal cross-sectional view of the electromagnetic relay concerning 4th Embodiment of this invention. It is a longitudinal cross-sectional view of the electromagnetic relay concerning 5th Embodiment of this invention. It is a longitudinal cross-sectional view of the electromagnetic relay concerning 6th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the side on which the electromagnet block of the electromagnetic relay is formed is defined as the front side in the front-rear direction, and the side on which the movable contact part and the fixed contact part are provided is defined as the rear side in the front-rear direction. The direction in which the case is attached is defined as the up-down direction. And the direction orthogonal to the front-back direction and the up-down direction is defined as the width direction.

  Moreover, the same component is contained in the following several embodiment. Therefore, in the following, common reference numerals are given to those similar components, and redundant description is omitted.

(First embodiment)
The electromagnetic relay 1 according to the present embodiment includes a case 2, a base 30, an electromagnet block 10, an armature 16, a movable contact portion 21, and a fixed contact portion 22.

  The base 30 is formed of a synthetic resin that is an insulating material, and includes a substantially U-shaped insulating wall 31 in a substantially central portion in plan view. An electromagnet housing portion 34 for housing the electromagnet block 10 is formed on the front side of the insulating wall 31 (left side in FIG. 7). On the other hand, a wall portion 32 is provided on the rear surface side (the right side in FIG. 7), and a contact housing portion 33 surrounded by the insulating wall 31 and the wall portion 32 is formed. In the contact accommodating portion 33, the movable contact portion 21 and the fixed contact portion 22 are disposed. Moreover, the insulating wall 31 has the effect | action which interrupts | blocks the electromagnet block 10 and a contact part (the movable contact part 21 and the fixed contact part 22).

  The electromagnet block 10 includes a yoke 14, a coil block 11, and an iron core 15.

  The yoke 14 is formed to be bent in a substantially L shape, and the coil block 11 formed by winding the coil 12 around the coil bobbin 13 is placed on the bottom plate 14 a of the yoke 14. The coil 12 is connected to a coil terminal 19 that is implanted in the insulating body 30. The iron core 15 includes a trunk portion 15b and a bowl-shaped suction piece 15a arranged at the head of the trunk portion 15b. In the state where the trunk portion 15b is passed through the through hole 13a of the coil bobbin 13, the yoke 15 14 is fixed to the mounting hole 14b of the bottom plate 14a.

  The armature 16 includes a magnetic pole piece 16a and a hanging piece 16b, and the magnetic pole piece 16a and the hanging piece 16b are formed in an L shape. In the present embodiment, the armature 16 is arranged in an inverted L shape so that the magnetic pole piece 16a extends in the upper part and substantially in the horizontal direction and the hanging piece 16b extends in the lower part and in the substantially vertical direction when viewed from the side. Has been. And the clamping piece 14c projected from the upper end both sides of the yoke 14 engages with the notch recess 16c formed in the both sides of the magnetic pole piece 16a, and the armature 16 is supported so that rocking | fluctuation is possible. The magnetic pole piece 16 a of the armature 16 is disposed at a position facing the attracting piece 15 a of the iron core 15.

  The hinge spring 18 is interposed between the armature 16 and the yoke 14, and a spring piece 18 a that presses the upper part of an insulating part 17 described later is formed on the upper part. When the coil 12 is not energized (when the electromagnet block 10 is not energized), the magnetic pole piece 16a of the armature 16 is separated from the attracting piece 15a of the iron core 15 by the pressing force of the spring piece 18a. Retained. On the other hand, when the coil 12 is energized (when the electromagnet block 10 is excited), the magnetic force of the attracting piece 15a of the iron core 15 overcomes the pressing force of the spring piece 18a, and the magnetic pole piece 16a of the armature 16 attracts the iron core 15. Contact piece 15a.

  The movable contact portion 21 that swings according to the operation (swing) of the armature 16 is attached to the hanging piece 16 b of the armature 16 via the insulating portion 17.

  The movable contact portion 21 is provided with a movable contact 21a. When the movable contact 21a contacts and separates from the fixed contact 22a provided on the fixed contact portion 22 according to the swing of the movable contact portion 21, contact switching is performed. Is done.

  In the present embodiment, the movable contact portion 21 includes a fixed piece 23 attached to the hanging piece 16b of the armature 16 via the insulating portion 17, a movable contact plate 25 provided with two movable contacts 21a and 21a, And a movable spring 24 for connecting the movable contact plate 25 to the fixed piece 23.

  Specifically, the movable contact plate 25 includes a connecting piece 25a that extends in the vertical direction and is connected to the movable spring 24, a bottom plate 25b that extends horizontally and rearward from the lower end of the connecting piece 25a, and a bottom plate. And a rising piece 25c that rises upward from the rear end of 25b.

  The movable contact 21a is fixed to the rising piece 25c so as to face backward. In the present embodiment, the bottom plate 25b has a bifurcated shape, and a rising piece 25c is formed at the rear end of each branched portion. With such a movable contact portion 21, the movable contact 21a protrudes rearward from the insulating portion 17, and the movable contact 21a and the insulating portion 17 do not overlap in plan view.

  As shown in FIG. 6, two sets of the fixed piece 23, the movable spring 24, and the movable contact plate 25 are provided. In other words, the electromagnetic relay 1 of the present embodiment is provided with four movable contacts 21a.

  The fixed contact portion 22 is composed of four fixed contact plates 26 to which the fixed contacts 22 a are fixed one by one, and is attached to the contact accommodating portion 33 of the base 30.

  Specifically, as shown in FIG. 7, the fixed contact plate 26 is bent in a crank shape, and the fixed contact 22 a is fixed to one end of the fixed contact plate 26. The fixed contact plate 26 does not necessarily need to be bent and formed in a crank shape, and can have various shapes. For example, it is possible to use a fixed contact plate that is not bent and is straight when viewed from the side.

  The fixed contact plate 26 is attached to the contact accommodating portion 33 of the base 30 by inserting the fixed contact plate 26 into the contact accommodating portion 33 from below with the fixed contact 22 a positioned on the upper side and the rear side. At this time, the four fixed contact plates 25 are attached such that the four fixed contacts 22a face the four movable contacts 21a. When the coil 12 is not energized (when the electromagnet block 10 is de-energized), the four fixed contacts 22a and the four movable contacts 21a are connected to the rear surface side of the contact housing portion 33 of the base 30 (the right side in FIG. 7). ) Separated from each other. On the other hand, when the movable contact portion 21 swings when the coil 12 is energized (when the electromagnet block 10 is excited), the four movable contacts 21a approach the four fixed contacts 22a that face each other. It comes to touch.

  Here, in the present embodiment, an arc extension space S is formed in the electromagnetic relay 1 for extending an arc generated when the movable contact 21a and the fixed contact 22a come in contact with and away from each other.

  Specifically, as shown in FIG. 2, a wall 2 a and a side wall 2 b are provided inside the case 2. Then, when the base 30 to which each member is attached is covered with the case 2, the pair of corresponding movable contact 21a and fixed contact 22a (contacts that come in contact with each other) are surrounded by the wall 2a and the side wall 2b. . In the present embodiment, the space partitioned by the wall portion 2a and the side wall 2b is an arc extension space S. At this time, the fixed contact 22a and the insulating portion 17 are defined by the wall portion 2a.

  Further, the electromagnetic relay 1 is provided with a permanent magnet (magnetic field generating means) 50 that guides an arc generated when the movable contact 21a and the fixed contact 22a come into contact with or separated from each other to the arc extension space S. As shown in FIGS. 4 and 5, the permanent magnet 50 is provided so as to extend vertically on one end side in the width direction of the paired movable contact 21 a and fixed contact 22 a. An arc generated when the movable contact 21 a and the fixed contact 22 a are brought into contact with each other is stretched above the arc extension space S by the magnetic action of the permanent magnet 50.

  Furthermore, an arc extinguishing part 40 is provided around the fixed contact part 22 in the arc extension space S so that the fixed contact 22a is accommodated. In the present embodiment, the arc extinguishing portion 40 has a box shape opened downward, and is inserted into the arc extension space S so as to cover the fixed contact 22a. A small opening 42 a is formed in the top wall 42 of the arc extinguishing part 40 so that the arc can easily enter the arc extension space S.

  Furthermore, the arc extinguishing part 40 is formed of an insulating material capable of generating arc extinguishing gas when the arc comes into contact. As an insulating material composing the arc extinguishing part 40, unsaturated polyester or a chain compound obtained by adding a metal hydroxide or a hydrate is preferable.

  The arc extinguishing part 40 and the permanent magnet 50 that are accommodated so as to cover the contacts (the movable contact 21a and the fixed contact 22a that form a pair) are covered with the magnetic breaking yoke 60 at both the upper side and the width direction. The magnetic interrupting yoke 60 is for suppressing the permanent magnet 50 acting on one contact from acting on another contact.

  The movable contact 21 includes a first extending piece 21b extending downward (one end) from the hanging piece 16b of the armature 16, and a rear (first) portion from the tip of the first extending piece 21b. And a second extending piece 21c extending in the direction of tolerance). Furthermore, a third extending piece 21d extending from the tip of the second extending piece 21c to the upper side (the other end side) is provided, and a movable contact 21a is provided on the third extending piece 21d. Is formed.

  In the present embodiment, the first extending piece 21b includes a fixed piece 23, a movable spring 24, and a connecting piece 25a. The second extending piece 21c is constituted by a bottom plate 25b, and the third extending piece 21d is constituted by a rising piece 25c.

  Further, among the wall portions (the wall portion 2a, the side wall 2b, and the side wall of the case 2) that define the arc extension space S, a third portion is provided below the wall portion 2a provided on the first extending piece 21b side. An opening into which the extended piece 21d can be inserted is formed.

  Specifically, the opening 2c and the opening 41a are respectively formed on the lower side of the wall 2a and on the lower side of the front wall 41 of the arc extinguishing part 40, whereby the movable contact 21a is formed. The extending piece 21d can be inserted into the arc extension space S.

  Next, the contact operation of the electromagnetic relay 1 having such a configuration will be described.

  In this electromagnetic relay 1, when the electromagnet block 10 is in a non-excited state, the spring piece 18 a of the hinge spring 18 presses the upper surface of the insulating portion 17, so that the armature 16 rotates in the clockwise direction in FIG. 7. doing. Therefore, the magnetic pole piece 16 a of the armature 16 is in a state separated from the attracting piece 15 a of the iron core 15. In this state, as shown in FIG. 7, the movable contact 21a and the fixed contact 22a are also separated.

  When the coil 12 is energized to excite the electromagnet block 10, a magnetic force that attracts the magnetic pole piece 16 a of the armature 16 to the attracting piece 15 a of the iron core 15 is generated through the yoke 14, the iron core 15, and the armature 16. At this time, the magnetic pole piece 16a of the armature 16 is attracted to the suction piece 15a of the iron core 15 against the spring force (pressing force) of the hinge spring 18, and the armature 16 rotates counterclockwise in FIG. To do. Accordingly, the movable contact plate 23 is also moved in the counterclockwise direction, and the four movable contacts 21a are in contact with the opposing fixed contacts 22a.

  When the energization of the coil 12 is stopped, the reverse operation is performed, and the movable contact 21a and the fixed contact 22a are separated.

  Thus, by switching on / off of energization to the coil 12, the movable contact 21a and the fixed contact 22a are brought into contact with and separated from each other, and an arc is generated when the movable contact 21a and the fixed contact 22a are brought into contact with and separated from each other. There is a case.

  When such an arc occurs, the arc is guided to the arc extension space S by a permanent magnet (magnetic field generating means) 50. That is, the arc generated when the movable contact 21a and the fixed contact 22a are brought into contact with or separated from each other is extended to a space (arc extension space S) in the arc extinguishing unit 40. At this time, the arc travels and extends so as to lick the inner surface of the arc extinguishing unit 40. That is, the arc extends while contacting the inner surface of the arc extinguishing unit 40. For this reason, arc extinguishing gas is generated from the arc extinguishing unit 40, and the arc is extinguished by the gas.

  As described above, according to the electromagnetic relay 1 of the present embodiment, the arc generated when the movable contact 21a and the fixed contact 22a are brought into contact with each other can be guided to the arc extension space S and extinguished.

  As described above, in the present embodiment, the arc extension space S is formed in the electromagnetic relay 1 for extending the arc generated when the movable contact 21a and the fixed contact 22a come in contact with and away from each other.

  Further, the electromagnetic relay 1 is provided with a permanent magnet (magnetic field generating means) 50 that guides an arc generated when the movable contact 21a and the fixed contact 22a come into contact with or separated from each other to the arc extension space S. Thus, by providing the permanent magnet (magnetic field generating means) 50, the arc length of the arc generated when the movable contact 21a and the fixed contact 22a come in contact with each other can be further increased, and the arc extinguishing performance (arc (Blocking performance) can be further increased.

  Therefore, according to this embodiment, the arc generated when the movable contact 21a and the fixed contact 22a come in contact with each other can be more reliably interrupted. Therefore, it can be suppressed that the reliability of the contacts (reliability of contact and separation between the movable contact 21a and the fixed contact 22a) is impaired.

  In addition, since the fixed contact 22a and the insulating portion 17 can be defined by providing the wall portion 2a, an arc generated when the movable contact 21a and the fixed contact 22a come in contact with or separates from the insulator 17 It can suppress contacting. Accordingly, it is possible to suppress the insulating gas from adhering to the fixed contact 22a and the movable contact 21a. As a result, it is possible to prevent the conductivity between the fixed contact 22a and the movable contact 21a from being hindered.

  Further, according to the present embodiment, the arc extinguishing part 40 is provided around the fixed contact part 22 in the arc extension space S. Therefore, an arc extinguishing gas can be generated by the arc extending while abutting against the inner surface of the arc extinguishing part 40, so that the arc extinguishing performance (arc interruption performance) can be further enhanced. Become.

  Further, according to the present embodiment, the movable contact 21 includes the first extending piece 21b extending downward (one end) from the hanging piece 16b of the armature 16, and the first extending piece 21b. 2nd extending piece 21c extended from the front-end | tip to the back (direction to which the 1st extending piece 21b is tolerated). Furthermore, a third extending piece 21d extending from the tip of the second extending piece 21c to the upper side (the other end side) is provided, and a movable contact 21a is provided on the third extending piece 21d. Is formed. Therefore, the arc extension space S can be formed above the contact without being obstructed by the insulating portion 17, and the configuration of the electromagnetic relay 1 can be simplified. Furthermore, the space above the part where the contact portion of the electromagnetic relay 1 is formed can be used effectively, and the electromagnetic relay 1 can be downsized.

  Further, according to the present embodiment, the opening 2c and the opening 41a are formed in the wall 2a and the front wall 41 of the arc extinguishing part 40, respectively, and the third extension in which the movable contact 21a is formed. The installation piece 21d can be inserted into the arc extension space S. As described above, by providing the opening 2c and the opening 41a in a range in which the movable contact 21a can swing, the arc guided to the arc extension space S is suppressed while the contact of the arc with the insulator 17 is suppressed. It is possible to suppress the leakage to the arc, and to further improve the arc extinguishing performance (arc interruption performance). Further, when the movable contact 21 a is swung, the movable contact 21 is made to move between the wall 2 a and the arc extinguishing unit 40 so that the wall defining the arc extension space S does not disturb the swing of the movable contact 21 a. There is no need to bypass the front wall 41. Therefore, compared with the case where the opening 2c and the opening 41a are not formed in the wall 2a and the front wall 41 of the arc extinguishing part 40, the electromagnetic relay 1 can be downsized in the height direction.

(Second Embodiment)
The electromagnetic relay 1A according to the present embodiment has the same configuration as the electromagnetic relay 1 of the first embodiment.

  That is, the electromagnetic relay 1 </ b> A according to this embodiment includes a case 2, a base 30, an electromagnet block 10, an armature 16, a movable contact portion 21, and a fixed contact portion 22.

  Also in the present embodiment, an arc extension space S is formed in the electromagnetic relay 1A for extending an arc generated when the movable contact 21a and the fixed contact 22a come in contact with and away from each other. The wall 2a defines a fixed contact 22a and an insulating portion 17.

  Specifically, as in the first embodiment, a wall 2a and a side wall 2b are provided inside the case 2. Then, when the base 30 to which each member is attached is covered with the case 2, the pair of corresponding movable contact 21a and fixed contact 22a (contacts that come in contact with each other) are surrounded by the wall 2a and the side wall 2b. . Also in this embodiment, the space partitioned by the wall 2a and the side wall 2b is an arc extension space S. At this time, the fixed contact 22a and the insulating portion 17 are defined by the wall portion 2a.

  Further, the electromagnetic relay 1A is provided with a permanent magnet (magnetic field generating means) 50 that guides an arc generated when the movable contact 21a and the fixed contact 22a come into contact with or separated from each other to the arc extension space S.

  The permanent magnet (magnetic field generating means) 50 is covered at both upper and widthwise ends by a magnetic shielding yoke 60.

  Here, in this embodiment, the arc extinguishing part 40 is not provided in the arc extension space S.

  Also according to this embodiment described above, the same operations and effects as those of the first embodiment can be achieved.

  In addition, in the electromagnetic relay 1A shown in FIG. 8, when the arc contacts the wall 2a, an insulating material that can generate an arc extinguishing gas (the same as the arc extinguishing unit 40 shown in the first embodiment). The wall 2a may also serve as an arc extinguishing part. Moreover, you may form the case 2 whole with the same material as the arc extinguishing part 40 shown in the said 1st Embodiment.

(Third embodiment)
The electromagnetic relay 1B according to the present embodiment has substantially the same configuration as the electromagnetic relay 1A in which the arc extinguishing unit 40 is not provided in the arc extension space S of the second embodiment.

  Here, the electromagnetic relay 1B of the present embodiment is mainly different from the electromagnetic relay 1A of the second embodiment in that a separation wall 70 for dividing the arc extension space S is provided as shown in FIG. is there.

  Specifically, even in the present embodiment, the space defined by the wall 2 a and the side wall 2 b formed inside the case 2 is an arc extension space S. Each partitioned arc extension space S is provided with a pair of corresponding movable contacts 21a and fixed contacts 22a (contacts that are separated from each other), and a separation wall 70 is provided for each arc extension space S. Yes.

  In this embodiment, the separation wall 70 is provided so as to protrude from the upper wall portion 2d of the case 2 toward the fixed contact 22a side, and divides the arc extension space S vertically into two along the extension direction of the arc A. ing.

  In this embodiment, one separation wall 70 is provided for each arc extension space S and the arc extension space S is divided into two parts. However, a plurality of separation walls 70 are provided for each arc extension space S, and arc extension is performed. The space S may be divided into three or more.

  Also according to the present embodiment described above, the same operations and effects as the first and second embodiments can be obtained.

  In the present embodiment, a separation wall 70 that divides the arc extension space S is provided. Therefore, the length of the arc A can be made longer than that in the first and second embodiments, and the arc extinguishing performance (arc cut-off performance) can be further increased as much as the separation wall 70 can be made to wrap around. be able to.

  Further, the improvement of the arc extinguishing performance (arc interruption performance) in this way increases the voltage generated between the two contacts 21a and 22a, which is an interruption voltage that can be interrupted between the movable contact 21a and the fixed contact 22a. There is an advantage that

  Furthermore, in the present embodiment, a space partitioned by the wall 2a and the side wall 2b formed inside the case 2 is defined as an arc extension space S, and a separation wall 70 is provided in the arc extension space S. Therefore, there is also an advantage that the arc A length can be increased while the arc extension space S has the same arc extinguishing space size as in the first and second embodiments. Therefore, the case 2 is reduced in size.

(Fourth embodiment)
The electromagnetic relay 1C according to the present embodiment has substantially the same configuration as the electromagnetic relay 1B in which the separation wall 70 that divides the arc extension space S of the third embodiment is provided.

  Here, the electromagnetic relay 1C of the present embodiment is mainly different from the electromagnetic relay 1B of the third embodiment in that an uneven portion 73 is provided on the wall surface facing the arc extension space S as shown in FIG. There is.

  Specifically, even in the present embodiment, the space defined by the wall 2 a and the side wall 2 b formed inside the case 2 is an arc extension space S. Each partitioned arc extension space S is provided with a pair of corresponding movable contact 21a and fixed contact 22a (contacts that are in contact with and away from each other). 73.

  In this embodiment, the uneven portion 73 is formed on the inner surface of the upper wall portion 2d of the case 2 as a wall surface facing the arc extension space S. In this way, the concave and convex portions 73 of the concave and convex portions 73 are formed along the extending direction of the arc A by providing the concave and convex portions 73 on the left and right sides of the upper wall portion 2d of the case 2 with the separation wall 70 interposed therebetween. I have to.

  Also according to this embodiment described above, the same operations and effects as those of the first to third embodiments can be obtained.

  In the present embodiment, the uneven portion 73 is provided on the wall surface facing the arc extension space S. For this reason, the length of the arc A can be made longer than that in the third embodiment, and the arc extinguishing performance (arc interruption performance) can be further increased as much as the concave and convex portion 73 can be wound around. . Further, the cut-off voltage can be further increased with respect to the third embodiment.

  Furthermore, in this embodiment, since the uneven portion 73 is formed along the extending direction of the arc A, the arc A can be surely entered by the uneven portion 73, and the arc A length can be reliably increased. .

  In this embodiment, the concavo-convex portion 73, which is a characteristic portion, is applied to the third embodiment in which the separation wall 70 is provided. However, in the first and second embodiments in which the separation wall 70 is not provided. Is applicable.

(Fifth embodiment)
The electromagnetic relay 1D according to the present embodiment has substantially the same configuration as the electromagnetic relay 1A in which the arc extinguishing unit 40 is not provided in the arc extension space S of the second embodiment.

  Here, the electromagnetic relay 1D of the present embodiment is mainly different from the electromagnetic relay 1A of the second embodiment, as shown in FIG. 11, provided with a separation wall 70A for dividing the arc extension spaces S1 and S2. There is.

  Specifically, in the present embodiment, the opening 2c formed on the lower side of the wall 2a is wider on the upper side than the second embodiment. The wall 2a functions as the separation wall 70A, the space on the fixed contact 22a side (right side in FIG. 11) from the separation wall 70A is the first arc extension space S1, and the movable contact plate 23 side (see FIG. 11) is a second arc extension space S2. Therefore, in the present embodiment, a plurality of first arc extension spaces S1 are formed corresponding to the pair of corresponding movable contact 21a and fixed contact 22a, whereas the second arc extension space S2 is the case 2 Only one is formed inside and shared.

  Also according to this embodiment described above, the same operations and effects as those of the first to fourth embodiments can be obtained.

  In the present embodiment, a separation wall 70A that divides the arc extension spaces S1 and S2 is provided. Therefore, the length of the arc A can be made longer than that in the first to fourth embodiments, and the arc extinguishing performance (arc cut-off performance) can be further increased as much as the separation wall 70A can be moved around. be able to. Further, the cut-off voltage can be further increased with respect to the first to fourth embodiments.

  In this embodiment, the arc extension spaces S1 and S2 are divided into two parts by the separation wall 70A. For example, the arc extension is performed by adding the separation wall 70 of the third embodiment to the first arc extension space S1. The space may be divided into three or more.

(Sixth embodiment)
The electromagnetic relay 1E according to the present embodiment has substantially the same configuration as the electromagnetic relay 1D provided with the separation wall 70A that divides the arc extension spaces S1 and S2 of the fifth embodiment.

  Here, the electromagnetic relay 1E of the present embodiment is mainly different from the electromagnetic relay 1D of the fifth embodiment in that an uneven portion 73 is provided on the wall surface facing the arc extension spaces S1 and S2, as shown in FIG. It is in providing.

  Specifically, even in this embodiment, the opening 2c formed on the lower side of the wall 2a is widened on the upper side, and the wall 2a functions as the separation wall 70A. The space on the fixed contact 22a side from the separation wall 70A is defined as a first arc extension space S1, and the space on the movable contact plate 23 side from the separation wall 70A is defined as a second arc extension space S2. Concave and convex portions 73 are provided in each of the arc extension spaces S1 and S2.

  In this embodiment, the concavo-convex portion 73 is formed on the inner surface of the upper wall portion 2d of the case 2 as a wall surface facing the arc extension spaces S1 and S2 and on the surface of the central wall 35 of the base 30 on the movable contact plate 23 side. Has been. The pair of concavo-convex portions 73 are formed so that the concave surface and the convex surface of the concavo-convex portion 73 are formed along the extending direction of the arc A.

  Also according to this embodiment described above, the same operations and effects as those of the first to fifth embodiments can be obtained.

  Moreover, in this embodiment, the uneven | corrugated | grooved part 73 is provided in the wall surface facing arc extension space S1, S2. For this reason, the length of the arc A can be made longer than that of the fifth embodiment, and the arc extinguishing performance (arc interruption performance) can be further increased as much as the concave and convex portion 73 can be wound around. . Further, the cut-off voltage can be further increased with respect to the fifth embodiment.

  Furthermore, in this embodiment, since the uneven portion 73 is formed along the extending direction of the arc A, the arc A can be surely entered by the uneven portions 73, 73, and the arc A length is reliably increased. Can do.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to the above embodiments, and various modifications can be made.

  For example, in each of the above embodiments, the movable contact portion is attached to the armature via the insulating portion, but the movable contact portion may be attached to the armature without going through the insulating portion.

  Further, the specifications (shape, size, layout, etc.) of the armature, hinge spring, and other details can be changed as appropriate.

DESCRIPTION OF SYMBOLS 1,1A Electromagnetic relay 2a Wall part 2c Opening part 10 Electromagnet block 16 Armature 21 Movable contact part 21a Movable contact 21b 1st extension piece 21c 2nd extension piece 21d 3rd extension piece 22 Fixed contact part 22a Fixed contact 23 Movable contact plate 24 Movable spring 25 Fixed contact plate 40 Arc extinguishing part 50 Permanent magnet (magnetic field generating means)
70, 70A Separation wall 73 Concavity and convexity S, S1, S2 Arc extension space

Claims (7)

An armature that swings when the electromagnet block is energized and de-energized, and a movable contact that is attached to the armature and swings as the armature swings, and the movable contact is in contact with the armature. An electromagnetic relay comprising a fixed contact portion having a fixed contact to be separated,
The electromagnetic relay is formed with an arc extension space for extending an arc generated when the movable contact and the fixed contact come in contact with and away from each other.
An electromagnetic relay comprising a magnetic field generating means for guiding an arc generated when the movable contact and the fixed contact come into contact with or separated from the arc extension space.   The electromagnetic relay according to claim 1, wherein an arc extinguishing portion is provided in the arc extension space. The movable contact includes a first extending piece extending from the armature toward one end, and a first extending piece extending from the tip of the first extending piece in a direction that is in tolerance with the first extending piece. 2 extended pieces, and a third extended piece extended from the tip of the second extended piece to the other end side,
The electromagnetic relay according to claim 1, wherein the movable contact is formed on the third extending piece. The arc extension space is defined by a wall,
The electromagnetic relay according to claim 3, wherein an opening into which the third extending piece can be inserted is formed below the wall.   The electromagnetic relay according to claim 1, further comprising a separation wall that divides the arc extension space.   The electromagnetic relay according to claim 1, wherein an uneven portion is provided on a wall surface facing the arc extension space.   The electromagnetic relay according to claim 6, wherein the uneven portion is formed along an extending direction of the arc.

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