JP2018142502A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electromagnetic relay which enables the downsizing while suppressing a mover from being tilted.SOLUTION: In an electromagnetic relay, a first guide 18a located in an exciting coil 12 and a second guide 18b located outside the exciting coil 12 form two contact points with a mover. Specifically, one leading end of a shaft 17 protrudes to outside the exciting coil 12, and the leading end of the shaft 17 thus protruding is moved to slide in the second guide 18b. Thus, the electromagnetic relay can be arranged in a structure in which one contact point is provided outside the exciting coil 12 can be arranged and as such, the size of the exciting coil 12 in its axial direction can be designed without factoring in the distance between two contact points. Therefore, the size of the exciting coil 12 in the axial direction can be reduced. Because of this, it becomes possible to achieve the downsizing of an electromagnetic relay while suppressing, by a mover guide 18, a mover from being tilted.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an electromagnetic relay that opens and closes an electric circuit by moving a movable contact and a fixed contact on and off based on magnetic attraction.

  Conventionally, an electromagnetic relay is known as a device for controlling on / off of an electric circuit. The electromagnetic relay is configured in a magnetic circuit that passes through the fixed core and the yoke based on energization to the exciting coil, and magnetically attracts the movable core together with the shaft, so that the movable contact attached to the shaft and the non-movable portion are provided. The electric circuit is turned on by contacting the fixed contact. Further, the magnetic circuit is turned off by canceling the energization of the exciting coil, and the electric circuit is turned off by separating the movable contact and the fixed contact by returning the shaft and the movable core to the rest position side. A return spring is provided between the fixed core and the movable core so that the shaft and the movable core can be accurately returned to the rest position side.

  As such an electromagnetic relay, there exists a thing shown by patent document 1, for example. In this electromagnetic relay, a fixed core having a hollow portion is arranged at the center of an electromagnetic coil, a shaft is inserted into the hollow portion of the fixed core, a movable core is joined to one end side of the shaft, and a movable contact is joined to the other end. It is structured. In addition, a return spring is disposed between the movable core and the fixed core, and a fixed contact is disposed on the opposite side of the fixed core with the movable contact interposed therebetween. Then, the movable core, the shaft, and the movable contact are moved forward and backward based on the energization state of the exciting coil, and the on / off of the electric circuit is controlled. Specifically, when the energizing coil is energized, the movable core is magnetically attracted toward the fixed core, and the shaft and the movable contact are moved together with the movable core. The electric circuit is turned on. When the energization of the exciting coil is released, the magnetic attraction force is released, and the movable core is biased away from the fixed core based on the spring force of the return spring. Is also moved together with the movable core, the movable contact is separated from the fixed contact, and the electric circuit is turned off.

JP-A-10-162676

  In an electromagnetic relay, when the movable core, shaft, etc. are tilted, the force (hereinafter referred to as side force) between the movable core made of magnetic material and other magnetic parts increases, and the movable core and its sliding Wear between the surfaces, for example, the inner wall surface of the bobbin of the exciting coil, increases. In order to suppress the inclination of the movable core and the shaft, it is necessary to increase the distance between the two contact points between the movable core and the shaft and the sliding surface.

  In the case of the electromagnetic relay of Patent Document 1, one contact point is between the movable core and its sliding surface, and the other contact point is the position farthest from the movable core among the sliding surfaces of the fixed core and the shaft. Become. For this reason, the axial dimension of the exciting coil is made long so that the distance between these two contact points becomes long. For this reason, compared with the number of coil turns required as an exciting coil, the volume of the space formed inside the yoke is increased, and a large amount of surplus space is present, which increases the size of the electromagnetic relay.

  An object of the present invention is to provide an electromagnetic relay that can be miniaturized while suppressing the inclination of the mover.

  In order to achieve the above object, an electromagnetic relay according to a first aspect of the present invention has a winding wound in a hollow shape, and has an exciting coil (12) that forms a magnetic field when energized, and a movable contact (21). Then, the mover (15, 17, 21) moved forward and backward based on the energization of the exciting coil, the guide (18, 18a, 18b, 13b) that supports the advancement / retraction of the mover, and the movement of the movable contact The guide has a movable contact and a first contact point in the hollow portion of the exciting coil, and is movable outside the exciting coil. It has a child and a second contact point.

  In this way, the contact point between the guide and the mover is configured in the hollow portion of the exciting coil and outside the exciting coil. For this reason, compared with a structure in which two contact points are provided in the excitation coil as in a conventional electromagnetic relay, two contacts can be made since a single contact point can be provided outside the excitation coil. The axial dimension of the exciting coil can be designed without taking the point distance into consideration. Therefore, the axial dimension of the exciting coil only needs to be designed according to the number of coil turns necessary for the exciting coil, and the axial dimension of the exciting coil can be reduced. For this reason, it is possible to reduce the size of the electromagnetic relay while suppressing the inclination of the mover by the guide.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows an example of a corresponding relationship with the specific means as described in embodiment mentioned later.

In the electromagnetic relay concerning 1st Embodiment, it is sectional drawing which showed the mode when the energization to the exciting coil was not performed. In the electromagnetic relay shown in FIG. 1, it is the perspective view shown about each component arrange | positioned in a case. In the electromagnetic relay shown in FIG. 1, it is sectional drawing which showed a mode when electricity supply to the exciting coil was performed. It is a figure which shows the result of having investigated the characteristic of the electromagnetic relay of this embodiment and the conventional structure by simulation. In the electromagnetic relay concerning 2nd Embodiment, it is sectional drawing which showed the mode when the energization to the exciting coil was not performed. In the electromagnetic relay shown in FIG. 5, it is sectional drawing which showed a mode when electricity supply to the exciting coil was performed. It is sectional drawing which showed the electromagnetic relay concerning the modification of 2nd Embodiment. It is sectional drawing of the electromagnetic relay demonstrated by other embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other will be described with the same reference numerals.

(First embodiment)
As shown in FIGS. 1 to 3, the electromagnetic relay includes a case 11, an excitation coil 12, a fixed core 13, a yoke 14, a movable core 15, a return spring 16, a shaft 17, a mover guide 18, a base 19, and a retaining ring 20. The movable contact 21 and the contact pressure spring 22 are provided.

  The case 11 is made of a nonmagnetic and nonconductive material such as a resin. Each component constituting the electromagnetic relay is accommodated in a space configured in the case 11.

  The exciting coil 12 forms a magnetic field when energized, has a cylindrical shape, and is wound around, for example, a bobbin 12a having a hollow cylindrical portion. Energization of the exciting coil 12 is performed through an external connection terminal (not shown). A fixed core 13, a movable core 15, a return spring 16, a part of the shaft 17, and a first guide 18 a among the movable element guides 18 are disposed in a central hole formed in the inner diameter portion of the exciting coil 12.

  The fixed core 13 is made of a magnetic material, is configured by a cylindrical member, and constitutes a part of the magnetic circuit. More specifically, the first guide 18a is disposed so as to cover the inner wall surface of the central hole in the exciting coil 12, and the fixed core 13 is disposed together with the movable core 15 and the shaft 17 inside the first guide 18a. The dimension of the fixed core 13 in the axial direction is smaller than the dimension of the exciting coil 12 in the central axis direction, and the outer diameter is matched with the inner diameter of the first guide 18a. The fixed core 13 has a structure in which a through hole 13a is formed along the central axis. A shaft is inserted into the through hole 13a and a return spring 16 is disposed.

  The yoke 14 is a magnetic member that surrounds the exciting coil 12. The yoke 14 is arranged so as to cover the outer peripheral side and the axial end of the exciting coil 12 and constitutes a part of the magnetic circuit, and becomes an opening corresponding to the position of the fixed core 13 on one side in the axial direction. The yoke hole 142a is formed.

  In the case of this embodiment, the yoke 14 is configured to have a first member 141 and a second member 142. The first member 141 is a member called a stationary, and has a structure in which a plate made of a magnetic material is bent into a substantially U shape. The first member 141 causes the outer peripheral side of the exciting coil 12 and one end side in the axial direction of the exciting coil 12 to be Covered. The second member 142 is a member called a top plate, is made of a magnetic material, is formed of a circular flat plate or a rectangular flat plate, and covers the other axial end of the exciting coil 12. The second member 142 is disposed so as to face the movable core 15 described later, and is joined to the first member 141.

  The first member 141 is formed with an opening 141a at the center position, and the first guide 18a and the first member 141 are joined by fitting a part of the first guide 18a into the opening 141a. ing. The second member 142 is formed with the yoke hole 142a at the center position so as to penetrate the second member 142. The shape of the yoke hole 142a, that is, the inner peripheral shape of the second member 142 is, for example, a circular shape.

  The movable core 15 is made of a magnetic material and has a cylindrical shape. The movable core 15 is disposed in the first guide 18 a together with the fixed core 13, so that the central axis is coaxial with the central axis of the fixed core 13. The movable core 15 is slidable in the first guide 18a by making the outer diameter slightly smaller than the inner diameter of the first guide 18a. A through hole 15 a into which the shaft 17 is inserted is formed on the central axis of the movable core 15. The movable core 15 is located at a rest position away from the fixed core 13 as shown in FIG. 1 when the energization to the excitation coil 12 is not performed. As shown in FIG. 3, the magnetic core is attracted toward the fixed core 13 and brought into contact with the fixed core 13.

  The return spring 16 is disposed between the fixed core 13 and the movable core 15 and biases the movable core 15 to the opposite side of the fixed core 13. When energizing the exciting coil 12, the movable core 15 is attracted toward the fixed core 13 against the return spring 16 by electromagnetic attraction force. The return spring 16 may be made of a nonmagnetic material, but may be made of a magnetic material.

  Thus, the fixed core 13, the yoke 14, and the movable core 15 are made of a magnetic material, and when energizing the energizing coil 12, a magnetic circuit through which the magnetic flux induced by the exciting coil 12 flows is configured. The

  The shaft 17 is made of a nonmagnetic material, for example, a rod-like member having a circular cross section. One end of the shaft 17 is coupled to the movable core 15 so that the shaft 17 can move integrally with the movable core 15. More specifically, the shaft 17 is coupled to the movable core 15 while being inserted into a through hole 15 a formed in the movable core 15. Further, the intermediate portion of the shaft 17 is inserted into a through hole 13a of the fixed core 13 and an opening 19a described later of the base 19 so as to be able to advance and retract. Further, a retaining ring 20 is coupled and a movable contact 21 is fitted to the other end of the shaft 17, that is, an end opposite to the end where the movable core 15 is joined. The tip of the movable contact 21 is inserted into a second guide 18b described later.

  In the case of the present embodiment, the movable core 15, the shaft 17, the movable contact 21, and the like are movable parts that are advanced and retracted by energizing and de-energizing the exciting coil 12. These movable parts constitute a movable element.

  The mover guide 18 is a guide for defining the advancing / retreating direction of the mover. In the case of this embodiment, the mover guide 18 is composed of two members, a first guide 18a and a second guide 18b.

  The first guide 18 a is a portion of the mover guide 18 that is disposed outside an arc extinguishing chamber 19 f described later, and is disposed in the central hole of the exciting coil 12 as described above. In the case of the present embodiment, the first guide 18 a is made of a nonmagnetic material and is a cylindrical member having a hollow portion, and is fixed to the inner wall surface of the central hole of the exciting coil 12 or one surface of the case 11. The movable core 15 is slidably disposed in the first guide 18a, and the fixed core 13 is fixed.

  The second guide 18b is arranged at a position corresponding to a tip different from the tip where the movable core 15 is arranged in the shaft 17 in an arc extinguishing chamber 19f described later. In the case of this embodiment, the second guide 18 b is configured by a cylindrical member having a hollow portion and is fixed to the base 19. The second guide 18b is made of, for example, a soft magnetic material, but may be made of either a magnetic material or a non-magnetic material, and is made of a material other than a metal such as a resin as well as a metal. Also good. One end of the shaft 17 is slidably inserted into the second guide 18b. The inner diameter of the second guide 18 b is made to correspond to the outer diameter of the shaft 17. The second guide 18b is arranged in alignment with the first guide 18a, the shaft 17, etc., and the relative position with respect to the first guide 18a is fixed regardless of whether the excitation coil 12 is energized or not. It is said that.

  The contact portion between the first guide 18a and the movable core 15 is the first contact point, and the contact portion between the second guide 18b and the shaft 17 is the second contact point. The direction can be regulated.

  The base 19 is made of a nonmagnetic insulating material such as a resin. The base 19 has an opening 19a at the center, and the shaft 17 is inserted into the opening 19a. The base 19 is fixed to the case 11 in contact with the yoke 14. In the present embodiment, the base 19 has a bottom wall 19b, a side wall 19c, and a top wall 19d, and the bottom wall 19b is in contact with the second member 142 of the yoke 14.

  The base 19 is provided with a first fixed contact 23a and a second fixed contact 23b made of conductive metal. The first fixed contact 23 a is disposed to face one connection portion 21 a of the movable contact 21 described later, and the second fixed contact 23 b is disposed to face the other connection portion 21 b of the movable contact 21. The first fixed contact 23a and the second fixed contact 23b constitute part of the wiring of the electric circuit that is subject to on / off control by the electromagnetic relay. In the case of the present embodiment, the first fixed contact 23a and the second fixed contact 23b are internally formed with screw grooves, and the wiring of an electric circuit to be subjected to on / off control by an electromagnetic relay is fastened to the screw grooves. So that they are electrically connected.

  Further, a concave portion 19e is formed at the center position of the upper surface wall 19d, and a cylindrical second guide 18b is fitted into the concave portion 19e. The second guide 18b has a shape corresponding to the shaft 17. For example, when the shaft 17 has a circular cross section as described above, the second guide 18b is a cylindrical member having an annular cross section. The shaft 17 can be slid in the second guide 18b.

  In the case of the present embodiment, the base 19 constitutes an arc extinguishing chamber 19f that is a sealed space in which an arc extinguishing gas is accommodated. Further, arc extinguishing magnets 24a and 24b are provided on both sides of the side wall 19c with the shaft 17 and the movable contact 21 interposed therebetween.

  The retaining ring 20 is disposed on the opposite side of the movable contact 21 to the fixed core 13 in the shaft 17, and is fixed by being fitted to the shaft 17. The retaining ring 20 positions the movable contact 21 in the axial direction of the shaft 17.

  The movable contact 21 is composed of a conductive metal plate-like member, and the two connection portions 21a and 21b contacting and separating from the first fixed contact 23a and the second fixed contact 23b are centered on the shaft 17, for example. It is provided in a symmetrical position. The movable contact 21, together with the retaining ring 20, is disposed on the opposite side of the base 19 from the base 19 in the shaft 17. In the case of the present embodiment, an opening 21c is formed at the center of the movable contact 21, and the shaft 17 is inserted into the opening 21c. One surface of the movable contact 21 opposite to the fixed core 13 is in contact with the retaining ring 20, and the movable contact 21 is positioned at the position of the retaining ring 20.

  The contact pressure spring 22 is disposed between the movable contact 21 and the base 19, and biases the movable contact 21 toward the retaining ring 20, that is, the first fixed contact 23a and the second fixed contact 23b. For this reason, even if vibration etc. arise, the connection of the movable contact 21 and the 1st fixed contact 23a and the 2nd fixed contact 23b is maintained.

  The electromagnetic relay concerning this embodiment is comprised by the above structures. Next, the operation of the electromagnetic relay according to the present embodiment will be described with reference to FIGS. 1 and 3.

  First, when the energizing coil 12 is not energized, no magnetic attraction force is generated by the exciting coil 12 when the energizing coil 12 is not energized. Therefore, as shown in FIG. It is in a state separated from the fixed core 13. The movable contact 21 is also away from the first fixed contact 23a and the second fixed contact 23b. For this reason, the electric circuit to be subjected to on / off control by the electromagnetic relay is in an off state.

  When the excitation coil 12 is energized, the movable core 15 is moved toward the fixed core 13 against the return spring 16 by the electromagnetic attractive force, and the shaft 17 and the movable contact 21 are moved to the movable core 15 as shown in FIG. To move in the same direction. Then, the connection portions 21a and 21b of the movable contact 21 come into contact with the first fixed contact 23a and the second fixed contact 23b, and the first fixed contact 23a and the second fixed contact 23a are electrically connected. .

  On the other hand, when the energization to the exciting coil 12 is released, the movable core 15 is moved by the return spring 16 to the opposite side to the fixed core 13, and the shaft 17 and the movable contact 21 also move in the same direction. To do. As a result, as shown in FIG. 1, the connecting portions 21a and 21b of the movable contact 21 are separated from the first fixed contact 23a and the second fixed contact 23b, and the gap between the first fixed contact 23a and the second fixed contact 23b is established. Electrically cut off.

  Here, when the above operation is performed, the contact portion between the first guide 18a and the movable core 15 becomes the first contact point, and the contact portion between the second guide 18b and the shaft 17 becomes the second contact point. The advance / retreat direction can be regulated while restraining the inclination of the child. That is, two contact points with the mover are configured by the first guide 18 a located in the exciting coil 12 and the second guide 18 b located outside the exciting coil 12.

  At this time, in the present embodiment, one end of the shaft 17 protrudes to the outside of the exciting coil 12, and the protruding end of the shaft 17 is slid within the second guide 18b. For this reason, compared with a structure in which two contact points are provided in the excitation coil as in a conventional electromagnetic relay, two contact points can be formed in a structure in which one contact point is provided outside the excitation coil 12. The axial dimension of the exciting coil 12 can be designed without considering the distance of the contact point.

  Therefore, the axial dimension of the exciting coil 12 only needs to be designed according to the number of coil turns necessary for the exciting coil 12, and the axial dimension of the exciting coil 12 can be reduced. For this reason, it is possible to reduce the size of the electromagnetic relay while suppressing the inclination of the mover by the mover guide 18.

  Further, since the axial dimension of the exciting coil 12 can be reduced, a portion that has conventionally been a surplus space can be used as a space in which the winding of the exciting coil 12 is disposed. The volume of can be reduced. For this reason, it is possible to further reduce the size of the electromagnetic relay.

  Furthermore, in the case of the conventional electromagnetic relay, since the axial dimension of the exciting coil is increased, the dimensions of the yoke and the fixed core in the same direction are increased accordingly, and the magnetic circuit length is increased accordingly. Magnetic resistance increases. For this reason, the characteristic of an electromagnetic relay will be reduced.

  On the other hand, in the case of the electromagnetic relay of this embodiment, the axial dimension of the exciting coil 12 can be reduced as compared with the conventional one, and accordingly, the dimensions of the yoke 14 and the fixed core 13 in the same direction can be reduced. The magnetic circuit length can be shortened and the magnetic resistance can be reduced. For this reason, it becomes possible to improve the characteristic of an electrical relay.

  Specifically, when the characteristics of the electromagnetic relays of the conventional structure and the structure of the present embodiment were simulated, the results shown in FIG. 4 were obtained. In the simulation, the change of the attractive force with respect to the gap between the movable core and the fixed core was examined. As shown in this result, it was possible to increase the suction force for the gap. Therefore, by using the electromagnetic relay of this embodiment, it is possible to improve the characteristics as compared with the electromagnetic relay having a conventional structure.

(Second Embodiment)
A second embodiment will be described. In this embodiment, the configuration of the mover guide is changed with respect to the first embodiment, and the other parts are the same as those in the first embodiment. Therefore, only the parts different from the first embodiment will be described.

  As shown in FIG. 5, in this embodiment, the end of the fixed core 13 opposite to the movable core 15 is extended to the movable contact 21 side located outside the exciting coil 12. Specifically, a guide portion 13 b having an outer diameter smaller than a portion of the fixed core 13 disposed in the exciting coil 12 is provided at the end of the fixed core 13 opposite to the movable core 15. The inner diameter of the guide portion 13b is a dimension corresponding to the outer diameter of the shaft 17, and the shaft 17 is slid within the guide portion 13b.

  The movable contact 21 has a structure in which a recessed portion 21d is formed on the first fixed contact 23a and the second fixed contact 23b side instead of the opening 21c as in the first embodiment. The guide portion 13b is in the state. Further, the bottom surface of the recess 21 d, that is, one surface facing the tip of the shaft 17, is a surface that comes into contact with the shaft 17 when the shaft 17 is moved along with the movement of the movable core 15 when the excitation coil 12 is energized. Yes.

  Further, with respect to the mover guide 18, only the portion corresponding to the first guide 18a referred to in the first embodiment, and the portion corresponding to the second guide 18b, corresponding to the provision of the guide portion 13b with respect to the fixed core 13. Is missing. Further, the retaining ring 20 is also eliminated.

  The electromagnetic relay concerning this embodiment is comprised by the above structures. In such a configuration, when the exciting coil 12 is energized, if the movable core 15 is moved toward the fixed core 13 based on the magnetic attractive force as shown in FIG. 6, the shaft 17 is also moved in the same direction. It is done. And the front-end | tip of the shaft 17 contact | abuts to the bottom face of the recessed part 21d, and pushes up the movable contact 21. FIG. As a result, the connecting portions 21a and 21b of the movable contact 21 come into contact with the first fixed contact 23a and the second fixed contact 23b, and the first fixed contact 23a and the second fixed contact 23a are electrically connected. Become.

  At this time, the contact portion between the movable core 15 and the mover guide 18 is the first contact point, and the contact portion between the shaft 17 and the guide portion 13b closest to the tip position on the movable contact 21 side is the second contact point. The advance / retreat direction can be suppressed while suppressing the inclination of the mover. As described above, the fixed core 13 includes the guide portion 13b, and the guide portion 13b and the shaft 17 are brought into contact with each other, that is, the second contact point is configured outside the exciting coil 12. The effect similar to 1st Embodiment can be acquired. Moreover, since the guide part 13b is provided with respect to the fixed core 13, it is necessary to provide the two members of the 1st guide 18a and the 2nd guide 18b only in order to comprise the needle | mover guide 18 like 1st Embodiment. Therefore, the number of parts can be reduced. Further, in the case of the present embodiment, since it is not necessary to align the shaft 17 and the second guide 18b as in the case where the second guide 18b as a separate member is provided, the manufacturing process can be facilitated, and assembly errors can be achieved. It is also possible to suppress the influence of shaft misalignment due to.

  In addition, since the contact pressure spring 22 is provided for preventing contact separation at the time of energization, the movable contact 21 is biased toward the first fixed contact 23 a and the second fixed contact 23 b by the spring force of the contact pressure spring 22. It will be. For this reason, the structure shown in FIG. 7 is preferable in order to allow the movable contact 21 to be accurately moved to the rest position when de-energized. Specifically, a through hole 21e is provided at the center of the bottom surface of the recess 21d, the tip of the shaft 17 protrudes from the through hole 21e, and a retaining ring 20 is provided at the protruding portion. The diameter of the portion of the shaft 17 that is not inserted into the through hole 21e, that is, the portion closer to the fixed core 13 than the bottom surface of the recess 21d is made larger than the diameter of the through hole 21e. With such a configuration, when the shaft 17 is moved downward as the movable core 15 moves, the retaining ring 20 abuts against the recess 21d so that the movable contact 21 can accurately return to the rest position. . Further, when the shaft 17 is moved upward on the paper surface during energization, a portion of the shaft 17 having a diameter larger than the through hole 21e is brought into contact with the bottom surface of the concave portion 21d, and the movable contact 21 is pushed up. The first fixed contact 23a and the second fixed contact 23b can be brought into contact with each other.

(Other embodiments)
The present invention is not limited to the embodiment described above, and can be appropriately changed within the scope described in the claims.

  For example, in the first and second embodiments, the arc extinguishing chamber 19f is configured by the base 19 as an example, but the arc extinguishing chamber 19f may not be formed. Further, the arc extinguishing chamber may be formed by a member different from the base 19.

  For example, as shown in FIG. 8, the arc extinguishing chamber may be constituted by an arc extinguishing wall 30 made of a metal or the like for hermetic sealing. In the case of the illustrated example, the arc extinguishing wall 30 has a disk-shaped first wall 30a, a cylindrical second wall 30b, a disk-shaped third wall 30c, and a bottomed cylindrical fourth wall 30d. ing. The first wall 30a is made of, for example, ceramics. The first wall 30a is formed with an opening into which the first fixed contact 23a and the second fixed contact 23b are fitted, and a recess 30e into which the second guide 18b is fitted. The first wall 30a and the second wall 30b are joined by brazing or the like, and the second wall 30b and the third wall 30c are joined to one surface side of the first member 141 by welding or the like. The fourth wall 30d is joined to the other surface side of the first member 141 by welding or the like while being disposed so as to surround the first guide 18a. By doing in this way, an arc extinguishing chamber can be constituted.

  The fourth wall 30d can also be used as the first guide 18a described in the first embodiment or the mover guide 18 described in the second embodiment. In that case, at least a part of the mover guide 18 can be constituted by a part of the arc extinguishing wall 30, and parts can be shared.

DESCRIPTION OF SYMBOLS 12 Excitation coil 13 Fixed core 13b Guide part 14 Yoke 15 Movable core 17 Shaft 18 Movable element guides 18a, 18b First, second guide 21 Movable contact 23a, 23b First, second fixed contact

Claims (7)

An exciting coil (12) that is formed by winding a winding in a hollow shape and forms a magnetic field by energization;
A movable element (15, 17, 21) having a movable contact (21), which is advanced and retracted based on energization of the exciting coil;
A guide (18, 18a, 18b, 13b) for supporting the advancement and retraction of the mover;
A fixed contact (23a, 23b) that is brought into and out of contact with the movable contact as the movable contact moves forward and backward;
The guide has the first contact point with the mover in the hollow portion of the excitation coil, and the electromagnetic relay has the second contact point with the mover outside the excitation coil. The guide is composed of two members, a first guide (18a) and a second guide (18b),
The first guide is disposed in the hollow portion of the exciting coil and is made of a nonmagnetic material,
The electromagnetic relay according to claim 1, wherein the second guide is disposed outside the exciting coil. A fixed core (13) that is disposed in a hollow portion of the excitation coil, constitutes a part of a magnetic circuit formed based on energization of the excitation coil, and has a through hole (13a);
The mover is
A rod-shaped shaft (17) inserted through the through hole of the fixed core;
A movable core (15) disposed on one end side of the shaft and magnetically attracted to the fixed core side when energizing the excitation coil;
The movable contact is disposed on the other end side of the shaft and on the opposite side of the movable core with respect to the fixed core;
The shaft and the movable contact are moved along with the movement of the movable core based on energization to the exciting coil, so that the movable contact and the fixed contact are brought into contact with and separated from each other.
The movable core is slidably disposed on the first guide, and a contact portion between the first guide and the movable core constitutes the first contact point,
The other end of the shaft is slidably inserted into the second guide, and a contact portion between the second guide and the shaft constitutes the second contact point. Electromagnetic relay.   The electromagnetic relay according to claim 2 or 3, wherein the first guide and the second guide have a fixed relative position regardless of whether the exciting coil is energized or not. A fixed core (13) that is disposed in a hollow portion of the excitation coil, constitutes a part of a magnetic circuit formed based on energization of the excitation coil, and has a through hole (13a);
The fixed core extends to the outside of the exciting coil, and a contact portion between a tip of a portion of the fixed core that extends to the outside of the exciting coil and the movable element is the second contact. The electromagnetic relay according to claim 1, constituting a point. An arc extinguishing chamber (19f) whose inside is a sealed space,
The movable contact and the fixed contact are separated from each other in the arc extinguishing chamber,
The electromagnetic relay according to any one of claims 1 to 5, wherein the first contact point is outside the arc-extinguishing chamber, and the second contact point is inside the arc-extinguishing chamber.   The electromagnetic relay according to claim 6, wherein an arc extinguishing gas is accommodated in the arc extinguishing chamber.

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