JP2014102945A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further reliably prevent separation between a movable contact and a fixed contact due to the electromagnetic repulsive force of a contact part.SOLUTION: When portions "a" of a stator 13 and a movable element 23 at which they are brought closer to each other are defined as a stator proximity plate part and a movable element proximity plate part, a direction D of a current flowing in the stator proximity plate part and a direction C of a current flowing in the movable element proximity plate part are made the same so as to generate inter-plate attraction force for attracting the movable element proximity plate part toward the stator proximity plate part side. Moreover, a distance between the stator proximity plate part and the movable element proximity plate part is made short to increase the inter-plate attraction force.

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.

  In the conventional electromagnetic relay, two plate-shaped stators having fixed contacts are positioned and fixed, and one movable element on which the movable contacts are mounted is moved so that the movable contact and the fixed contact are separated from each other. The circuit is opened and closed.

  An electromagnetic repulsive force is generated when a current flows in a reverse direction at a contact portion between the movable contact and the fixed contact at a contact portion between the movable contact and the fixed contact (hereinafter, this electromagnetic repulsive force is referred to as an electromagnetic repulsive force of the contact portion). Called). The contact portion electromagnetic repulsive force acts to separate the movable contact and the fixed contact.

  In view of this, the direction of the current flowing in a portion where both of the stator and the movable element are close to each other and facing each other is made the same to generate a Lorentz force that presses the movable contact against the fixed contact (see, for example, Patent Document 1). .

JP 2012-28253 A

  However, since the contact portion electromagnetic repulsion force increases as the flowing current increases, there is a possibility that the movable contact and the fixed contact may be separated when a large current is applied.

  The present invention has been made in view of the above points, and it is an object of the present invention to more reliably prevent separation between a movable contact and a fixed contact due to contact portion electromagnetic repulsion.

  In order to achieve the above object, the invention described in claim 1 includes two stators (13) having fixed contacts (14) and a plate-like movable element (23) having movable contacts (25). In the electromagnetic relay that opens and closes the electric circuit by moving the movable element (23) to move the fixed contact (14) and the movable contact (25), both of the stator (13) and the movable element (23) are When the adjacent parts (a to g) are a stator proximity plate part and a mover proximity plate part, the direction of current flowing through the stator proximity plate part (D) and the direction of current flowing through the mover proximity plate part ( C) is made the same, and a suction force between the plate portions that sucks the mover proximity plate portion toward the stator proximity plate portion side is generated, and the fixed contact (14) and the movable contact (25) are generated by the suction force between the plate portions. Is configured such that the mover proximity plate portion is biased in the direction in which the A portion of the stator (13) where the fixed contact (14) is provided is a fixed contact mounting plate, and a portion of the mover (23) where the movable contact (25) is provided is a movable contact mounting plate. The distance between the fixed contact mounting plate portion and the movable contact mounting plate portion in a state where the contact (14) and the movable contact (25) are in contact is L1, and the fixed contact (14) and the movable contact (25) are When the distance between the stator proximity plate portion and the mover proximity plate portion in the contact state is L2, L2 <L1.

  According to this, since the attractive force between the plate parts is inversely proportional to the distance L2, the attractive force between the plate parts becomes larger than in the case of L2 = L1, and the separation between the movable contact and the fixed contact due to the electromagnetic repulsive force of the contact part is further increased. It can be surely prevented.

  According to a second aspect of the present invention, in the electromagnetic relay according to the first aspect, at least one of the stator (13) and the mover (23) is bent so that L2 is reduced. To do.

  According to this, the suction force between the plate portions can be increased without increasing the number of parts.

  The invention according to claim 3 is the electromagnetic relay according to claim 2, wherein the stator (13) is bent.

  By the way, in general, the mover is thicker than the stator in order to increase the heat capacity and suppress the temperature rise. Therefore, by bending the stator having a relatively thin plate thickness, the variation in the distance L2 can be reduced, and consequently the variation in the suction force between the plate portions can be reduced.

  According to a fourth aspect of the present invention, in the electromagnetic relay according to any one of the first to third aspects, a Lorentz force is applied to an arc generated between the fixed contact (14) and the movable contact (25). And a magnet (26) for extending the arc, and the arc generated at the end of power running is extended in a direction away from the stator proximity plate portion and the mover proximity plate portion.

  By the way, the current flowing during power running is larger than the current flowing during regeneration. Therefore, the arc at the end of power running becomes longer than the arc at the end of regeneration, and re-ignition of the arc at the end of power running is likely to occur. Therefore, by adopting the configuration according to claim 4, it is possible to prevent re-ignition of the arc at the end of power running.

  According to a fifth aspect of the present invention, in the electromagnetic relay according to any one of the first to third aspects, a Lorentz force is applied to an arc generated between the fixed contact (14) and the movable contact (25). A magnet (26) for extending the arc so that the arc generated at the end of power running and the arc generated at the end of regeneration are extended substantially parallel to the extending direction of the stator proximity plate portion and the mover proximity plate portion. It is configured.

  According to this, it is possible to prevent both the arc at the end of power running and the re-ignition of the arc at the end of regeneration.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim shows the correspondence with the specific means as described in embodiment mentioned later.

It is front sectional drawing which shows the electromagnetic relay which concerns on 1st Embodiment of this invention, and is equivalent to sectional drawing which follows the II line | wire of FIG. It is sectional drawing which follows the II-II line | wire of FIG. 1A is a plan view of the mover 23 and the stator 13 in FIG. 1, FIG. 2B is a plan view of the mover 23 in FIG. 1A, and FIG. 2C is a plan view of the stator 13 in FIG. It is sectional drawing which follows the IV-IV line of FIG. (A) is a top view which shows the needle | mover 23 and the stator 13 in the electromagnetic relay which concerns on 2nd Embodiment of this invention, (b) is a top view of the needle | mover 23 of (a), (c) is (a). It is a top view of the stator 13 of. It is a top view which shows the needle | mover 23 and the stator 13 in the electromagnetic relay which concerns on 3rd Embodiment of this invention. It is A arrow directional view of FIG. (A) is a top view which shows the needle | mover 23 and the stator 13 in the electromagnetic relay which concerns on 4th Embodiment of this invention, (b) is a top view of the stator 13 of (a). It is sectional drawing which follows the IX-IX line of FIG. (A) is a top view which shows the needle | mover 23 and the stator 13 in the electromagnetic relay which concerns on 5th Embodiment of this invention, (b) is a top view of the needle | mover 23 of (a), (c) is (a). It is a top view of the stator 13 of. It is sectional drawing which follows the XI-XI line of FIG. It is a perspective view of the principal part in the stator 13 of FIG. It is a top view which shows the needle | mover 23 and the stator 13 in the electromagnetic relay which concerns on 6th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
A first embodiment of the present invention will be described.

  As shown in FIGS. 1 and 2, the electromagnetic relay according to the present embodiment includes a resin base 11 having a substantially rectangular parallelepiped shape and having a housing space 10 therein, and closes one end side opening of the housing space 10. A resin cover 12 is coupled to the base 11.

  Two stators 13 made of a conductive metal plate are fixed to the base 11. One end of the stator 13 is located in the accommodation space 10 and the other end protrudes into the external space. In the following description, one is called a first stator 13a and the other is called a second stator 13b as necessary.

  A fixed contact 14 made of conductive metal is caulked and fixed to an end of the stator 13 on the side of the accommodation space 10. A load circuit terminal 131 connected to an external harness (not shown) is formed on the external space side of the stator 13. The load circuit terminal 131 of the first stator 13a is connected to a power source (not shown) via an external harness, and the load circuit terminal 131 of the second stator 13b is connected to an electric load (see FIG. (Not shown).

  A cylindrical coil 15 that generates an electromagnetic force when energized is coupled to the base 11 so as to close the opening at the other end of the accommodation space 10. The coil 15 is connected to an ECU (not shown) via an external harness, and the coil 15 is energized via the external harness.

  A flanged cylindrical plate 16 made of a magnetic metal material is disposed between the base 11 and the coil 15, and a yoke 17 made of a magnetic metal material is disposed on the opposite side of the coil 15 and the outer peripheral side. Is arranged. The plate 16 and the yoke 17 are fixed to the base 11.

  A fixed core 18 made of a magnetic metal material is disposed in the inner circumferential space of the coil 15, and the fixed core 18 is held by a yoke 17.

  In the inner circumferential space of the coil 15, a movable core 19 made of a magnetic metal is disposed at a position facing the fixed core 18. The movable core 19 is slidably held on the plate 16.

  Further, a return spring 20 that urges the movable core 19 toward the anti-fixed core is disposed between the fixed core 18 and the movable core 19. When the coil is energized, the movable core 19 is attracted toward the fixed core 18 against the return spring 20.

  The plate 16, the yoke 17, the fixed core 18, and the movable core 19 constitute a magnetic path of magnetic flux induced by the coil 15.

  A metal shaft 21 penetrates and is fixed to the movable core 19. One end of the shaft 21 extends toward the anti-fixed core side, and an insulator 22 made of a resin having high electrical insulation is fitted and fixed to the end portion on the one end side of the shaft 21.

  A mover 23 made of a conductive metal plate is disposed in the accommodation space 10. A contact pressure spring 24 that urges the mover 23 toward the stator 13 is disposed between the mover 23 and the cover 12.

  A movable contact 25 made of conductive metal is caulked and fixed to the mover 23 at a position facing the fixed contact 14. When the movable core 19 or the like is driven to the fixed core 18 side by electromagnetic force, the fixed contact 14 and the movable contact 25 come into contact with each other.

  Next, detailed configurations and arrangements of the stator 13 and the mover 23 will be described with reference to FIGS.

  3 indicates the flow of current in the mover 23, and the arrow D in FIG. 3 indicates the flow of current in the stator 13. Also, in this specification, the direction in which the two movable contacts 25 are arranged (the left-right direction in FIG. 1 to FIG. 3) is referred to as the movable contact arrangement direction, and the moving direction of the mover 23 (the vertical direction in FIG. The direction perpendicular to the paper surface of FIG. 3 is referred to as the mover moving direction, and the direction perpendicular to the movable contact arrangement direction and the mover moving direction (the vertical direction of the paper surface in FIGS. 2 and 3) is referred to as the reference direction Z.

  The mover 23 includes two movable contact mounting plate portions 230 to which the movable contact 25 is fixed, and two movable member outer plate portions 231 located outside the movable contact mounting plate portion 230 in the movable contact arrangement direction. Yes.

  The movable contact mounting plate 230 and the movable member outer plate 231 extend parallel to the reference direction Z and are connected at one end side in the extending direction. The two movable element outer plate portions 231 are connected to each other in the extending direction by a single movable member connecting plate portion 232. The movable element connecting plate portion 232 extends in the movable contact arrangement direction.

  The mover 23 includes one spring receiving plate portion 233 that receives the contact pressure spring 24. The spring receiving plate portion 233 is positioned between the two movable contact mounting plate portions 230 and protrudes from the intermediate portion in the longitudinal direction of the mover connecting plate portion 232 and extends in the reference direction Z.

  In addition, the shape of the needle | mover 23 when it planarly views like FIG.3 (b) is axisymmetric about the straight line E as an axis of symmetry.

  The stator 13 includes a fixed contact mounting plate portion 132 to which the fixed contact 14 is fixed, and a stator outer plate portion 133 that is located outside the fixed contact mounting plate portion 132 in the movable contact arrangement direction.

  The fixed contact mounting plate portion 132 and the stator outer plate portion 133 extend parallel to the reference direction Z, and are connected at one end side in the extending direction.

  When viewed along the moving direction of the mover, the entire area of the mover outer side plate portion 231 overlaps with a part of the stator outer side plate portion 133, and this overlapping portion is close. In addition, the overlapping and adjacent portions are hereinafter referred to as a proximity portion a. In FIG. 3, this proximity part a is shown in a twill pattern for convenience.

  In the proximity portion a, the shape and arrangement of the stator 13 and the mover 23 are set so that the direction of the current flowing through the mover 23 and the direction of the current flowing through the stator 13 are the same.

  In addition, the site | part which comprises the proximity | contact part a in the needle | mover 23, ie, the needle | mover outer side board part 231, is corresponded to the needle | mover vicinity board part of this invention. Further, a portion constituting the proximity portion a in the stator 13, that is, a portion of the stator outer plate portion 133 that overlaps the mover outer plate portion 231 in the moving direction of the mover corresponds to the stator proximity plate portion of the present invention. .

  Here, the distance between the fixed contact mounting plate portion 132 and the movable contact mounting plate portion 230 in a state where the fixed contact 14 and the movable contact 25 are in contact is L1, and the fixed contact 14 and the movable contact 25 are in contact with each other. The distance between the stator outer plate portion 133 and the mover outer plate portion 231 in this state is L2.

  The mover 23 has a flat plate shape. The mover 23 uses a plate material thicker than the stator 13 in order to increase the heat capacity and suppress the temperature rise.

  On the other hand, the stator 13 is bent at a portion connecting the fixed contact mounting plate 132 and the stator outer plate 133 so that the stator outer plate 133 approaches the mover outer plate 231. Thereby, L2 <L1. Hereinafter, the bent portion is referred to as a bent portion 139.

  Next, the operation of the electromagnetic relay according to this embodiment will be described. First, when the coil 15 is energized, the movable core 19, the shaft 21, and the insulator 22 are attracted toward the fixed core 18 against the return spring 20 by electromagnetic force, and the mover 23 is biased against the contact pressure spring 24. Then, it moves following the movable core 19 and the like. As a result, the movable contact 25 abuts against the opposing fixed contact 14, the two load circuit terminals 131 are brought into conduction, and a current flows through the movable element 23 and the like. Incidentally, after the movable contact 25 comes into contact with the fixed contact 14, the movable core 19 and the like further move toward the fixed core 18, and the insulator 22 and the movable element 23 are separated.

  When the two load circuit terminals 131 are electrically connected, the direction of the current flowing through the movable element 23 is the same as the direction of the current flowing through the stator 13 at the adjacent part a, and therefore, the fixed part is fixed to the movable part 23 at the adjacent part a. A suction force, which is a Lorentz force, is generated between the child 13. Hereinafter, the suction force of the proximity portion a is referred to as inter-plate portion suction force a.

  As in the present embodiment, when the current path at the proximity site a is one path (in other words, when the current path is not branched at the proximity site a), the inter-plate suction force a is expressed by the following formula (1): Is required.

_{a = (μ 0 · i /} 2 · π · L2) · L · i = (μ 0/2 · π · L2) · L · i 2 ... (1)
Where μ _{0 is} the magnetic permeability of the fluid between the mover 23 and the stator 13, i is the value of the current flowing through the proximity part a, and L is the length of the proximity part a.

As is apparent from this equation, the attraction force a between the plate portions in the case where the current path in the proximity site a is one path is proportional to the square of the current value (that is, i ² ). On the other hand, the attraction force a between the plate portions when the current path branches into two at the proximity site a is proportional to 1/2 · i ² . Therefore, compared with the case where the current path is branched into two at the proximity portion a, the present embodiment can obtain the double plate-to-plate suction force a.

  Further, since the inter-plate suction force a is inversely proportional to the distance L2, the inter-plate suction force a becomes larger than when L2 = L1 by providing the bent portion 139 so that L2 <L1.

  The movable element 23 is attracted toward the stator 13 by the inter-plate suction force a. In other words, the movable element 23 is biased in the direction in which the movable contact 25 and the fixed contact 14 are brought into contact with each other by the inter-plate portion suction force a. And since the force with which the movable element 23 is urged by the attraction force a between the plates becomes a force that opposes the contact portion electromagnetic repulsion force, the separation between the movable contact 25 and the fixed contact 14 by the contact portion electromagnetic repulsion force. Is less likely to occur.

  On the other hand, when the power supply to the coil 15 is cut off, the movable core 19 and the movable element 23 are urged toward the anti-fixed core side by the return spring 20 against the contact pressure spring 24. As a result, the movable contact 25 is separated from the fixed contact 14 and the two load circuit terminals 131 are disconnected.

  According to the present embodiment, the attractive force a between the plate portions is proportional to the square of the current value, so that the separation between the movable contact 25 and the fixed contact 14 due to the electromagnetic repulsion force of the contact portion is reliably prevented even when a large current is applied. be able to.

  Further, since the suction force a between the plate portions is inversely proportional to the distance L2, by providing the bent portion 139 and satisfying L2 <L1, the suction force a between the plate portions is increased, and the movable contact 25 caused by the contact portion electromagnetic repulsion force The separation between the fixed contacts 14 can be prevented more reliably.

  Accordingly, the spring force of the contact pressure spring 24 can be set small, and the contact pressure spring 24 can be reduced in size, and hence the electromagnetic relay can be reduced in size.

  Further, by bending the stator 13 having a relatively thin plate thickness, the variation in the distance L2 can be reduced, and hence the variation in the suction force a between the plate portions can be reduced.

(Second Embodiment)
In the second embodiment of the present invention, only the parts different from the first embodiment will be described.

  As shown in FIG. 5, when viewed along the mover moving direction, a part of the mover connecting plate part 232 overlaps with a part of the fixed contact mounting plate part 132, and this overlapping portion is close to Yes. The overlapping and adjacent parts are hereinafter referred to as a proximity part b. In FIG. 5, the adjacent portion b is shown in a twill pattern for convenience.

  And in the proximity | contact part b, the shape and arrangement | positioning of the stator 13 and the needle | mover 23 are set so that the direction of the electric current which flows through the needle | mover 23 and the direction of the electric current which flows through the stator 13 may become the same.

  In addition, the site | part which comprises the proximity | contact part b in the needle | mover 23 is equivalent to the needle | mover proximity | contact board part of this invention. Moreover, the site | part which comprises the proximity | contact part b in the stator 13 is equivalent to the stator proximity | contact board part of this invention.

  In the present embodiment, since the direction of the current flowing through the mover 23 and the direction of the current flowing through the stator 13 are the same in the proximity part b, the Lorentz force between the mover 23 and the stator 13 is also in the proximity part b. A suction force is generated. Hereinafter, the suction force of the proximity part b is referred to as inter-plate part suction force b.

  Since the movable element 23 is attracted to the stator 13 side not only by the inter-plate portion attractive force a but also by the inter-plate portion attractive force b, the opening between the movable contact 25 and the fixed contact 14 by the contact portion electromagnetic repulsive force. Separation is less likely to occur.

(Third embodiment)
Only a different part from 2nd Embodiment is demonstrated about 3rd Embodiment of this invention.

  As shown in FIGS. 6 and 7, in this embodiment, the position of the first stator 13a is changed. More specifically, the load circuit terminal 131 (see FIG. 2) of the first stator 13a and the first stator 13a The load circuit terminal 131 (see FIG. 2) of the two stator 13b protrudes to the outside at a diagonal position of the base 11 (see FIG. 2).

  Further, the shapes of the mover 23 and the stator 13 are changed corresponding to the position change of the first stator 13a, and the shapes of the mover 23 and the stator 13 when viewed in plan as shown in FIG. Is changed to a point-symmetric shape with the point F as the center.

  Specifically, the mover connecting plate 232 includes a first mover connecting plate 232a on the side close to the first stator 13a, and a second mover connecting plate 232b on the side close to the second stator 13b. It is divided into One end sides of the first mover connecting plate portion 232a and the second mover connecting plate portion 232b are connected to the mover outer plate portion 231, and the other end side of the first mover connecting plate portion 232a is connected to the second end side. The other end side of the mover connecting plate portion 232b is connected by a spring receiving plate portion 233.

  When viewed in the moving direction of the mover, a part of the first mover connecting plate 232a and a part of the second mover connecting plate 232b overlap with a part of the fixed contact mounting plate 132. The overlapping parts are close to each other. In FIG. 6, the overlapping and adjacent parts are shown as a proximity part b in a cross pattern for convenience. At the proximity portion b, an inter-plate suction force b, which is a Lorentz force, is generated between the mover 23 and the stator 13.

  In the present embodiment, the inter-plate suction force b, which is the suction force of the proximity portion b, is generated on one side in the reference direction Z with respect to the contact contact portion, and on the other side in the reference direction Z with respect to the contact contact portion. Since this occurs, the posture of the mover 23 is stabilized.

(Fourth embodiment)
In the fourth embodiment of the present invention, only the parts different from the second embodiment will be described.

  As shown in FIGS. 8 and 9, in the present embodiment, the first stator 13a has the same shape as the second stator 13b.

  Specifically, the first stator 13a includes the fixed contact mounting plate 132 to which the fixed contact 14 is fixed, and the second stator 13b side from the fixed contact mounting plate 132 (that is, the inner side in the movable contact arrangement direction). ) Located on the stator inner plate 134.

  Correspondingly, the shape of the mover 23 has been changed, and the shape of the mover 23 when viewed in plan as shown in FIG. 8 has been changed to a point-symmetric shape with the point F as the center. Yes.

  Specifically, the mover connecting plate 232 includes a first mover connecting plate 232a on the side close to the first stator 13a, and a second mover connecting plate 232b on the side close to the second stator 13b. It is divided into One end sides of the first mover connecting plate portion 232a and the second mover connecting plate portion 232b are connected to the mover outer plate portion 231, and the other end side of the first mover connecting plate portion 232a is connected to the second end side. The other end side of the mover connecting plate portion 232b is connected by a spring receiving plate portion 233.

  And when it sees along a needle | mover moving direction, a part of 2nd needle | mover connection board part 232b has overlapped with a part of fixed contact attachment board part 132, and this overlap part is adjoining. In FIG. 8, the overlapping and adjacent parts are shown as a neighboring part b in a cross pattern for convenience. At the proximity portion b, an inter-plate suction force b, which is a Lorentz force, is generated between the mover 23 and the stator 13.

  Further, when viewed along the moving direction of the mover, a part of the spring receiving plate part 233 overlaps with a part of the stator inner plate part 134 in the first stator 13a, and this overlapping portion is close to Yes. In FIG. 8, the overlapping and adjacent parts are shown as a proximity part c in a cross-hatched pattern for convenience.

  And in the proximity | contact part c, the shape and arrangement | positioning of the stator 13 and the needle | mover 23 are set so that the direction of the electric current which flows through the needle | mover 23 and the direction of the electric current which flows through the stator 13 may become the same. Accordingly, a suction force that is a Lorentz force is generated between the mover 23 and the stator 13 also in the proximity portion c.

  In addition, the site | part which comprises the proximity | contact part c in the needle | mover 23 is corresponded to the needle | mover vicinity board part of this invention. Moreover, the site | part which comprises the proximity | contact part c in the stator 13 is equivalent to the stator proximity | contact board part of this invention.

  Here, the distance between the stator inner side plate portion 134 and the receiving plate portion 233 when the fixed contact 14 and the movable contact 25 are in contact with each other is L2.

  The first stator 13a is bent at a portion connecting the fixed contact mounting plate 132 and the stator inner plate 134 so that the stator inner plate 134 approaches the spring receiving plate 233. As a result, L2 <L1, and the suction force between the plate portions of the proximity portion c is increased.

  In this embodiment, since the 1st stator 13a and the 2nd stator 13b are made into the same shape, the cost of those components can be reduced.

(Fifth embodiment)
In the fifth embodiment of the present invention, only the parts different from the second embodiment will be described.

  As shown in FIGS. 10 to 12, the movable element 23 includes two movable contact mounting plate portions 230 to which the movable contact 25 is fixed, and 2 located on the inner side of the movable contact mounting plate portion 230 in the movable contact arrangement direction. Two mover inner side plate portions 234 are provided.

  The movable contact mounting plate portion 230 and the movable member inner plate portion 234 extend in parallel to the reference direction Z, and are connected at one end side in the extending direction. Further, the two movable element inner side plate portions 234 are connected to each other in the extending direction by a single movable piece connecting plate portion 232. The movable element connecting plate portion 232 extends in the movable contact arrangement direction.

  The mover 23 includes one spring receiving plate portion 233 that receives the contact pressure spring 24. The spring receiving plate portion 233 is positioned between the two mover inner plate portions 234 and protrudes from the intermediate portion in the longitudinal direction of the mover connecting plate portion 232 and extends in the reference direction Z.

  The stator 13 includes a fixed contact mounting plate portion 132 to which the fixed contact 14 is fixed, and a stator inner plate portion 134 that is positioned on the inner side of the fixed contact mounting plate portion 132 in the movable contact arrangement direction. The fixed contact mounting plate portion 132 and the stator inner plate portion 134 extend in parallel to the reference direction Z and are connected at one end side in the extending direction.

  When viewed along the moving direction of the mover, the entire area of the mover inner side plate portion 234 overlaps with a part of the stator inner side plate portion 134, and the overlapping portions are close to each other. Hereinafter, the overlapping and adjacent portions are referred to as a proximity portion d. In FIG. 10, this proximity part d is shown in a twill pattern for convenience.

  And in the proximity | contact part d, the shape and arrangement | positioning of the stator 13 and the needle | mover 23 are set so that the direction of the electric current which flows through the needle | mover 23 and the direction of the electric current which flows through the stator 13 may become the same. Accordingly, a suction force which is a Lorentz force is generated between the mover 23 and the stator 13 also in the proximity portion d. Since the mover 23 is attracted to the stator 13 side by the attracting force of the proximity part d, the separation between the movable contact 25 and the fixed contact 14 due to the contact portion electromagnetic repulsion is less likely to occur.

  Here, the distance between the stator inner plate portion 134 and the movable member inner plate portion 234 in a state where the fixed contact 14 and the movable contact 25 are in contact with each other is L2.

  The stator 13 is bent at a portion connecting the fixed contact mounting plate 132 and the stator inner plate 134 so that the stator inner plate 134 approaches the mover inner plate 234. As a result, L2 <L1, and the suction force between the plate portions of the proximity portion d is increased.

  In addition, the site | part which comprises the proximity | contact part d in the needle | mover 23, ie, the needle | mover inner board part 234, is corresponded to the needle | mover vicinity board part of this invention. Further, a portion constituting the proximity portion d in the stator 13, that is, a portion of the stator inner plate portion 134 that overlaps the mover inner plate portion 234 in the mover moving direction corresponds to the stator proximity plate portion of the present invention. .

  The proximity portion d is located between the fixed contact 14 of the first stator 13a and the fixed contact 14 of the second stator 13b, and the fixed contact 14 is located on the outermost side of the stator 13 in the movable contact arrangement direction. ing. The movable contact 25 is located on the outermost side of the movable element 23 in the movable contact arrangement direction.

  By the way, although a contact contact part tends to generate | occur | produce heat, by arrange | positioning the stationary contact 14 and the movable contact 25 in the outermost direction of a movable contact arrangement like this embodiment, one contact contact part and the other contact contact part The distance between the contact points can be increased (that is, the heat source can be dispersed), and the contact point can be brought close to the base 11 cooled by the outside air. Thus, the temperature rise of the contact point contact portion can be suppressed.

(Sixth embodiment)
In the sixth embodiment of the present invention, only the parts different from the fifth embodiment will be described.

  As shown in FIG. 13, the permanent magnet 26 for extending the arc by applying a Lorentz force to the arc generated when the movable contact 25 moves away from the fixed contact 14 is arranged in the direction of the movable contact than the movable contact mounting plate 230. It is arranged outside.

  A motor generator is connected to the electromagnetic relay as an electric load. An arrow C in FIG. 13 indicates a current flow in the mover 23 during power running, and an arrow D in FIG. 13 indicates a current flow in the stator 13 during power running.

  Here, the current between the fixed contact 14 and the movable contact 25 is adjusted so that the Lorentz force acting on the arc is substantially parallel to the extending direction of the stator inner plate 134 and the mover inner plate 234. The direction and the direction of the magnetic flux in the region where the fixed contact 14 and the movable contact 25 face each other are set.

  13 indicates the direction of Lorentz force acting on the arc generated at the end of power running, and arrow H in FIG. 13 indicates the direction of Lorentz force acting on the arc generated at the end of regeneration. Yes.

  According to the present embodiment, both the arc generated at the end of power running and the arc generated at the end of regeneration are stretched substantially parallel to the extending direction of the stator inner plate portion 134 and the mover inner plate portion 234. In other words, those arcs do not go to the stator inner plate part 134 and the mover inner plate part 234 side, which are parts where the gap is narrow. Therefore, both the arc at the end of power running and the re-ignition of the arc at the end of regeneration can be prevented.

  By the way, the current flowing during power running is larger than the current flowing during regeneration. Therefore, the arc at the end of power running becomes longer than the arc at the end of regeneration, and re-ignition of the arc at the end of power running is likely to occur.

  Therefore, the Lorentz force acting on the arc generated at the end of power running is configured to move away from the stator inner plate portion 134 and the mover inner plate portion 234, and the arc generated at the end of power running is By extending the plate 134 and the mover inner plate 234 away from each other, arc re-ignition at the end of power running can be more reliably prevented.

(Other embodiments)
In each of the above embodiments, only the stator 13 is bent in order to shorten the distance L2. However, only the mover 23 may be bent, or both the stator 13 and the mover 23 may be bent.

  Moreover, in each said embodiment, although the fixed contact 14 of another member was crimped and fixed to the stator 13, the projection part which protrudes toward the needle | mover 23 side is formed in the stator 13, for example by press work, The protrusion may be a fixed contact.

  Similarly, in each of the above embodiments, the movable contact 25, which is a separate member, is caulked and fixed to the movable element 23. However, a protrusion that protrudes toward the stationary element 13 is formed on the movable element 23 by, for example, pressing. The protrusion may be a movable contact.

  In addition, this invention is not limited to above-described embodiment, In the range described in the claim, it can change suitably.

  Further, the above embodiments are not irrelevant to each other, and can be combined as appropriate unless the combination is clearly impossible.

  In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily indispensable except for the case where it is clearly indicated that the element is essential and the case where the element is clearly considered essential in principle. Yes.

  Further, in each of the above embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to the specific number except for the case.

  Further, in each of the above embodiments, when referring to the shape, positional relationship, etc. of the component, etc., the shape, unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to the positional relationship or the like.

13 stators 14 fixed contacts 23 movers 25 movable contacts

Claims (5)

Two stationary elements (13) having a stationary contact (14) and a plate-shaped movable element (23) having a movable contact (25) are provided, and the stationary contact (14) is moved by the movement of the movable element (23). And an electromagnetic relay that opens and closes an electric circuit by bringing the movable contact (25) into and out of contact,
When the portions (ag) in which both of the stator (13) and the mover (23) are close to each other are used as a stator proximity plate portion and a mover proximity plate portion,
The direction of the current flowing through the stator proximity plate portion (D) is the same as the direction of the current flowing through the mover proximity plate portion (C), and the mover proximity plate portion is sucked toward the stator proximity plate portion. Generating a suction force between the plate portions, and the movable member proximity plate portion is biased by the suction force between the plate portions in a direction in which the fixed contact (14) and the movable contact (25) are brought into contact with each other. Configured as
A portion of the stator (13) where the fixed contact (14) is provided is a fixed contact mounting plate portion, and a portion of the mover (23) where the movable contact (25) is provided is mounted as a movable contact. A distance between the fixed contact mounting plate portion and the movable contact mounting plate portion in a state where the fixed contact (14) and the movable contact (25) are in contact with each other is L1, and the fixed contact ( 14) when the distance between the stator proximity plate portion and the mover proximity plate portion in a state where the movable contact (25) is in contact is L2, L2 <L1. Electromagnetic relay.   The electromagnetic relay according to claim 1, wherein at least one of the stator (13) and the mover (23) is bent so that L2 becomes small.   The electromagnetic relay according to claim 2, wherein the stator (13) is bent. A magnet (26) for extending the arc by applying Lorentz force to the arc generated between the fixed contact (14) and the movable contact (25);
The arc generated at the end of power running is configured to be stretched in a direction away from the stator proximity plate portion and the mover proximity plate portion. Electromagnetic relay. A magnet (26) for extending the arc by applying Lorentz force to the arc generated between the fixed contact (14) and the movable contact (25);
An arc generated at the end of power running and an arc generated at the end of regeneration are configured to be stretched substantially parallel to the extending direction of the stator proximity plate portion and the mover proximity plate portion. The electromagnetic relay as described in any one of Claim 1 thru | or 3.

Images