JP5083236B2 - Electromagnetic relay - Google Patents

Description

  The present invention relates to an electromagnetic relay that opens and closes an electric circuit.

  In the conventional electromagnetic relay disclosed in Patent Document 1, the fixed contact is positioned and held at a predetermined position by a fixed contact holding member, and the movable member on which the movable contact is mounted is driven by the electromagnetic force of the electromagnetic coil. The electrical circuit is opened and closed by moving the fixed contact and the fixed contact. A magnet is disposed in the vicinity of the movable contact and the fixed contact, and a Lorentz force is applied to the arc generated when the movable contact is separated from the fixed contact, thereby extending and blocking the arc.

JP 2006-351240 A

  However, there are cases where the arc cannot be sufficiently stretched and the arc cannot be reliably interrupted only by arranging a magnet in the vicinity of the movable contact and the fixed contact as in the conventional electromagnetic relay. In particular, in an electromagnetic relay for high voltage (for example, for a hybrid vehicle having a voltage of 400 V), it is difficult to reliably interrupt the arc because the arc length becomes long.

  An object of this invention is to make it possible to interrupt | block an arc reliably in view of the said point.

  In order to achieve the above object, in the invention described in claim 1, a bottomed cylindrical case (11), a plate-like base (10) covering the opening of the case (11), a case (11), The electromagnetic coil (16) disposed in the internal space (10a) formed by the base (10) and generating electromagnetic force when energized, and the electromagnetic coil (16) disposed in the internal space (10a) A movable member (20, 23) driven by force, a movable contact (24, 25) mounted on one end of the movable member (20, 23), and a movable contact ( 24, 25) and fixed contacts (14, 15) fixed to the base (10) in a state of penetrating the base (10) and positioned at one end located in the internal space (10a). , 15) is installed and protrudes into the external space. The fixed contact holding member (12, 13) to which the external harness is connected to the load circuit terminal (121, 131), the fixed contact (14, 15) and the movable contact (24, 25) are arranged and fixed to the side. In an electromagnetic relay comprising a magnet (26, 27) for applying a Lorentz force to an arc generated between the contact (14, 15) and the movable contact (24, 25), the fixed contact (14, 15) and the movable contact The arc stretched in the Lorentz force acting direction (F1, F2) in the case (11) where the Lorentz force acting direction in the region facing (24, 25) is the Lorentz force acting direction (F1, F2). Guide portions (111, 112) for guiding the arc so that the arc after the collision is stretched in a direction different from the Lorentz force acting direction (F1, F2) at the site where the collision occurs The guide portion in the fixed contact holding member (12, 13) is formed by the case partition wall (113, 114) formed between the guide portion (111, 112) in the case (11) and the base (10). Guide portion facing portions (125, 135) facing (111, 112) are covered.

  According to this, since the arc extends along the guide portions (111, 112), the arc can be sufficiently stretched and the arc can be reliably interrupted.

  In addition, since the guide portion facing portion (125, 135) of the fixed contact holding member (12, 13) is covered with the case partition wall (113, 114), the guide portion facing portion (125, 135) and the guide portion (111). , 112) can be prevented from being short-circuited with the arc.

  According to a second aspect of the present invention, in the electromagnetic relay according to the first aspect, the guide portions (111, 112) are directed from the portion of the case (11) where the arc collides toward the bottom side of the case (11). It is characterized by extending.

  According to this, the arc can be sufficiently extended even in a narrow space in the case (11), and the arc can be reliably interrupted.

  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 sectional drawing which shows the electromagnetic relay which concerns on one Embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is sectional drawing which follows the BB line of FIG. It is sectional drawing which follows the CC line of FIG. (A) is a front view of the fixed contact holding member of FIG. 1, (b) is a plan view of (a), and (c) is a right side view of (a).

  An embodiment of the present invention will be described. The electromagnetic relay according to the present embodiment includes a plate-like base 10 made of resin and a bottomed cylindrical cuboid case 11 made of resin. The base 10 is fitted into the case 11 so as to close the opening of the case 11, and a space (hereinafter referred to as an internal space) 10 a is formed by the base 10 and the case 11.

  Two fixed contact holding members 12 and 13 made of conductive metal are fixed to the base 10. The two fixed contact holding members 12 and 13 pass through the base 10, one end side is located in the internal space 10 a, the other end side is located in the external space, and an intermediate portion is located in the through hole of the base 10. ing.

  The fixed contacts 14 and 15 made of conductive metal are caulked and fixed to the end portions on the inner space 10a side of the two fixed contact holding members 12 and 13, respectively. The two fixed contacts 14 and 15 are positioned and held at predetermined positions by the two fixed contact holding members 12 and 13.

  Load circuit terminals 121 and 131 connected to an external harness (not shown) are formed on the external space side of the two fixed contact holding members 12 and 13. The first load circuit terminal 121 of the first fixed contact holding member 12 is connected to a power source (not shown) via an external harness, and the second load circuit terminal 131 of the second fixed contact holding member 13 is externally connected. It is connected to an electrical load (not shown) via a harness.

  The two fixed contact holding members 12 and 13 include insertion plate portions 124 and 134 that are connected to the load circuit terminals 121 and 131 and are located in the through holes of the base 10. The two fixed contact holding members 12 and 13 are assembled by being press-fitted into the through hole of the base 10 from the inner space 10a side. The insertion plate portion end surfaces 125 and 135 that are the end surfaces of the insertion plate portions 124 and 134 on the anti-load circuit terminal side are exposed from the base 10. Note that the insertion plate end faces 125 and 135 correspond to the guide portion facing portion of the present invention.

  Further, two coil terminals 17 (only one is shown) and a yoke 18 respectively connected to the electromagnetic coil 16 are fixed to the base 10 by press fitting or the like.

  The electromagnetic coil 16 has a resin bobbin 161 and a coil wire 162 wound around the bobbin 161, and generates electromagnetic force when energized. A fixed iron core 19 made of a magnetic metal material is disposed in the center hole of the bobbin 161.

  The yoke 18 is made of a magnetic metal material, bent in a U shape, and constitutes a magnetic path of magnetic flux induced by the electromagnetic coil 16. The electromagnetic coil 16 is fixed to the yoke 18.

  A movable iron piece 20 made of a magnetic metal is disposed at a position facing the fixed iron core 19, and the movable iron piece 20 is attracted to the fixed iron core 19 side when the coil is energized. The movable iron piece 20 is connected to the yoke 18 by a metal connecting plate 21 bent into a substantially L shape. The connecting plate 21 causes the movable iron piece 20 to act on the movable iron piece 20 in the direction in which the movable iron piece 20 is separated from the fixed core 19 when the coil is not energized.

  A U-shaped conductive metal leaf spring 23 is coupled to the movable iron piece 20 by a resin coupling member 22. Movable contacts 24, 25 made of conductive metal are caulked and fixed to both ends of the leaf spring 23, the first movable contact 24 is disposed to face the first fixed contact 14, and the second movable contact 25 is the second movable contact 25. It is arranged opposite to the fixed contact 15. In addition, the movable iron piece 20 and the leaf | plate spring 23 comprise the movable member of this invention.

  A first permanent magnet 26 for applying a Lorentz force to an arc generated when the first movable contact 24 moves away from the first fixed contact 14 is disposed on the side of the first fixed contact 14 and the first movable contact 24. Has been. Further, on the side of the second fixed contact 15 and the second movable contact 25, a second permanent magnet 27 that applies Lorentz force to an arc generated when the second movable contact 25 moves away from the second fixed contact 15. Is arranged. These permanent magnets 26 and 27 are formed in a cylindrical shape, and are inserted into recesses formed in the side wall of the case 11.

  The base 10 is formed with a base partition wall 101 protruding into the internal space 10a. The base partition wall 101 separates the space in which the first fixed contact 14 and the first movable contact 24 are arranged from the space in which the second fixed contact 15 and the second movable contact 25 are arranged.

  Here, the direction of a line passing through the center of the first fixed contact 14 and the center of the first movable contact 24 is defined as a first contact arrangement direction D1. A direction of a line orthogonal to the first contact arrangement direction D1 and passing through the first permanent magnet 26 is defined as a first magnet arrangement direction E1. Further, the direction of the Lorentz force acting on the arc in the region where the first fixed contact 14 and the first movable contact 24 face each other is referred to as a first Lorentz force acting direction F1.

  In the first fixed contact holding member 12, the end surface 122 on the side where the first fixed contact 14 is mounted is opposed to the first permanent magnet 26. Further, the first fixed contact holding member 12 extends from the second fixed contact holding member 13 after the vicinity of the first fixed contact 14 extends away from the first permanent magnet 26 along the first magnet arrangement direction E1. Extends away.

  In the leaf spring 23, the end surface 231 on the side where the first movable contact 24 is mounted is opposed to the first permanent magnet 26, and the vicinity of the first movable contact 24 is first along the first magnet arrangement direction E1. It extends in a direction away from the permanent magnet 26.

  The first Lorentz force acting direction F1 is perpendicular to the first contact arrangement direction D1 and the first magnet arrangement direction E1 and is away from the second fixed contact 15 and the second movable contact 25. The direction of current between the first fixed contact 14 and the first movable contact 24 and the direction of magnetic flux in the region where the first fixed contact 14 and the first movable contact 24 face each other are set.

  An end portion 261 on the first Lorentz force acting direction F1 side in the first permanent magnet 26 is a side surface 123 on the first Lorentz force acting direction F1 side in the mounting portion of the first fixed contact 14 of the first fixed contact holding member 12, and a plate The spring 23 further extends in the first Lorentz force acting direction F1 from the side surface 232 on the first Lorentz force acting direction F1 side in the first movable contact 24 mounting portion.

  An end portion 262 of the first permanent magnet 26 opposite to the first Lorentz force acting direction F1 is an end portion 141 of the first fixed contact 14 opposite to the first Lorentz force acting direction F1, and a first movable contact. 24 extends further in the direction opposite to the first Lorentz force acting direction F1 than the end 241 opposite to the first Lorentz force acting direction F1.

  Of the inner wall portion of the case 11, the arc stretched in the first Lorentz force acting direction F <b> 1 in a position opposed to the first Lorentz force acting direction F <b> 1 when viewed from the first fixed contact 14 and the first movable contact 24. A concave or groove-shaped first guide portion 111 is formed at the colliding portion. The first guide portion 111 extends in a direction parallel to the first contact arrangement direction D1, and an arc that collides with the first guide portion 111 is applied in a direction substantially parallel to the first contact arrangement direction D1 (that is, Lorentz force action). Guide (in a direction different from the direction F1).

  In other words, the first guide portion 111 extends from the portion of the inner wall portion of the case 11 where the arc first collides toward the bottom side of the case 11, and the arc that collides with the first guide portion 111 is transferred to the case 11. Guide is provided from the opening side toward the bottom side.

  Further, a first case partition wall 113 is formed between the first guide portion 111 and the base 10 in the case 11. The first case partition wall 113 covers the first insertion plate portion end surface 125 of the first fixed contact holding member 12.

  Next, the direction of a line passing through the center of the second fixed contact 15 and the center of the second movable contact 25 is defined as a second contact arrangement direction D2. A direction of a line orthogonal to the second contact arrangement direction D2 and passing through the second permanent magnet 27 is defined as a second magnet arrangement direction E2. In addition, the direction of the Lorentz force acting on the arc in the region where the second fixed contact 15 and the second movable contact 25 face each other is defined as a second Lorentz force acting direction F2.

  The second fixed contact holding member 13 has the end surface 132 on the side where the second fixed contact 15 is mounted facing the second permanent magnet 27. The second fixed contact holding member 13 extends from the first fixed contact holding member 12 after the vicinity of the second fixed contact 15 extends in the direction away from the second permanent magnet 27 along the second magnet arrangement direction E2. Extends away.

  In the leaf spring 23, the end surface 233 on the side where the second movable contact 25 is mounted is opposed to the second permanent magnet 27, and the vicinity of the second movable contact 25 is second along the second magnet arrangement direction E2. It extends in a direction away from the permanent magnet 27.

  The second Lorentz force acting direction F2 is perpendicular to the second contact arrangement direction D2 and the second magnet arrangement direction E2 and is away from the first fixed contact 14 and the first movable contact 24. The direction of the current between the second fixed contact 15 and the second movable contact 25 and the direction of the magnetic flux in the region where the second fixed contact 15 and the second movable contact 25 face each other are set.

  The end portion 271 on the second Lorentz force acting direction F2 side of the second permanent magnet 27 is a side surface 133 on the second Lorentz force acting direction F2 side of the second fixed contact holding member 13 mounting portion and the plate The spring 23 extends further in the second Lorentz force acting direction F2 than the side surface 234 on the second Lorentz force acting direction F2 side in the mounting portion of the second movable contact 25 of the spring 23.

  An end portion 272 of the second permanent magnet 27 opposite to the second Lorentz force acting direction F2 is an end portion 151 opposite to the second Lorentz force acting direction F2 of the second fixed contact 15 and a second movable contact. 25 extends further in the direction opposite to the second Lorentz force acting direction F2 than the end 251 opposite to the second Lorentz force acting direction F2.

  In the inner wall portion of the case 11, the arc stretched in the second Lorentz force acting direction F <b> 2 in the opposite position of the second Lorentz force acting direction F <b> 2 when viewed from the second fixed contact 15 and the second movable contact 25. A concave or groove-shaped second guide portion 112 is formed at the colliding portion. The second guide portion 112 extends in a direction parallel to the second contact arrangement direction D2, and causes the arc that collides with the second guide portion 112 in a direction substantially parallel to the second contact arrangement direction D2 (that is, Lorentz force action). Guide (in a direction different from the direction F2).

  In other words, the second guide portion 112 extends from the portion of the inner wall portion of the case 11 where the arc first collides toward the bottom side of the case 11, and the arc that collides with the second guide portion 112 is transferred to the case 11. Guide is provided from the opening side toward the bottom side.

  Further, a second case partition wall 114 is formed between the second guide portion 112 and the base 10 in the case 11. The second case partition wall 114 covers the second insertion plate portion end surface 135 of the second fixed contact holding member 13.

  Next, the operation of the electromagnetic relay according to this embodiment will be described. First, when the electromagnetic coil 16 is energized, the movable iron piece 20 is attracted to the fixed iron core 19 side by the electromagnetic force, the first movable contact 24 comes into contact with the first fixed contact 14, and the second movable contact 25 is second fixed. Abutting on the contact 15, the two fixed contacts 14, 15 are connected by a leaf spring 23 to close the electric circuit. On the other hand, when the energization of the electromagnetic coil 16 is interrupted, the movable contacts 24 and 25 are separated from the fixed contacts 14 and 15 by the elastic force of the connecting plate 21, and the electric circuit is opened.

  And the arc generated when the movable contacts 24, 25 are separated from the fixed contacts 14, 15 is interrupted as follows.

  First, the arc generated between the first fixed contact 14 and the first movable contact 24 is stretched in the first Lorentz force acting direction F1 by the Lorentz force as shown by the white arrow in FIG. The permanent magnet 26 is stretched while being bent toward the end portion 261 side on the first Lorentz force acting direction F1 side. That is, the arc is stretched in a direction away from the first fixed contact holding member 12 and the leaf spring 23.

  Here, the end 261 of the first permanent magnet 26 on the first Lorentz force acting direction F1 side is the side surface 123 of the first fixed contact holding member 12 on the first Lorentz force acting direction F1 side, and the first end of the leaf spring 23. Since it further extends in the first Lorentz force acting direction F1 than the side surface 232 on the Lorentz force acting direction F1 side, the arc can be stretched longer than in the past. Therefore, when the arc length is short like the low voltage electromagnetic relay, the arc is interrupted before the arc collides with the inner wall surface of the first guide portion 111.

  Further, when the arc length is long as in a high voltage electromagnetic relay, the arc is collided with the inner wall surface of the first guide portion 111 and then guided to the first guide portion 111 as shown in FIG. The case 11 is stretched toward the bottom side to be blocked. Thus, since the arc can extend along the first guide portion 111, the arc can be sufficiently extended even in a narrow space in the case 11, and the arc can be more reliably interrupted.

  Further, since the first insertion plate portion end surface 125 of the first fixed contact holding member 12 is covered with the first case partition wall 113, a short circuit between the first insertion plate portion end surface 125 and the arc in the first guide portion 111 is prevented. Can be prevented.

  On the other hand, the arc generated between the second fixed contact 15 and the second movable contact 25 is stretched in the second Lorentz force acting direction F2 by the Lorentz force as shown by the white arrow in FIG. The permanent magnet 27 is stretched while being bent toward the end 271 side on the second Lorentz force acting direction F2 side. That is, the arc is stretched in a direction away from the second fixed contact holding member 13 and the leaf spring 23.

  Here, the end 271 of the second permanent magnet 27 on the second Lorentz force acting direction F2 side is the side surface 133 of the second fixed contact holding member 13 on the second Lorentz force acting direction F2 side and the second side of the leaf spring 23. Since it further extends in the second Lorentz force acting direction F2 than the side surface 234 on the Lorentz force acting direction F2 side, the arc can be stretched longer than before. Therefore, when the arc length is short like the low voltage electromagnetic relay, the arc is interrupted before the arc collides with the inner wall surface of the second guide portion 112.

  In addition, when the arc length is long as in a high voltage electromagnetic relay, the arc is collided with the inner wall surface of the second guide portion 112 and then guided to the second guide portion 112 as shown in FIG. The case 11 is stretched toward the bottom side to be blocked. Thus, since the arc can extend along the second guide portion 112, the arc can be sufficiently extended even in a narrow space in the case 11, and the arc can be more reliably interrupted.

  Further, since the insertion plate portion end surface 135 of the second fixed contact holding member 13 is covered with the second case partition wall 114, a short circuit between the second insertion plate portion end surface 135 and the arc in the second guide portion 112 is prevented. be able to.

  In the present embodiment, the voltage between the first fixed contact 14 and the first movable contact 24 and the voltage between the second fixed contact 15 and the second movable contact 25 are halved by the partial pressure, and the arc Since the length is shortened, the arc can be more reliably interrupted.

  Further, the first fixed contact holding member 12 extends from the second fixed contact holding member 13 after the vicinity of the first fixed contact 14 extends away from the first permanent magnet 26 along the first magnet arrangement direction E1. The second fixed contact holding member 13 extends in a direction away from the second permanent contact 27 and extends in a direction away from the second permanent magnet 27 along the second magnet arrangement direction E2. Since it extends in a direction away from the contact holding member 12, the insulation between the first fixed contact holding member 12 and the second fixed contact holding member 13 can be enhanced.

(Other embodiments)
In the above-described embodiment, two sets of contacts that contact and separate are provided in order to halve the voltage between the contacts by dividing the voltage. However, if it is not necessary to reduce the voltage between the contacts, one set of contacts that contact and separate may be provided.

DESCRIPTION OF SYMBOLS 10 Base 11 Case 12 1st fixed contact holding member 13 2nd fixed contact holding member 14 1st fixed contact 15 2nd fixed contact 16 Electromagnetic coil 20 Movable iron piece (movable member)
23 Leaf spring (movable member)
24 1st movable contact 25 2nd movable contact 26 1st magnet 27 2nd magnet 111 1st guide part 112 2nd guide part 113 1st case partition 114 second case partition 121 1st load circuit terminal 131 2nd load circuit terminal 125 1st insertion board part end surface (guide part opposing part)
135 Second insert plate end face (guide portion facing portion)

Claims (2)

A bottomed cylindrical case (11);
A plate-like base (10) for closing the opening of the case (11);
An electromagnetic coil (16) that is disposed in an internal space (10a) formed by the case (11) and the base (10) and generates an electromagnetic force when energized;
A movable member (20, 23) disposed in the internal space (10a) and driven by electromagnetic force of the electromagnetic coil (16);
Movable contacts (24, 25) attached to one end of the movable members (20, 23);
A fixed contact (14, 15) disposed in the internal space (10a) and contacting and leaving the movable contact (24, 25);
The fixed contact (14, 15) is fixed to the base (10) in a state of penetrating the base (10), and the fixed contact (14, 15) is attached to one end located in the internal space (10a), and protrudes to the external space. Fixed contact holding members (12, 13) to which an external harness is connected to load circuit terminals (121, 131)
Lorentz is arranged on the side of the fixed contact (14, 15) and the movable contact (24, 25), and the arc generated between the fixed contact (14, 15) and the movable contact (24, 25). In an electromagnetic relay comprising magnets (26, 27) for applying force,
When the Lorentz force acting direction (F1, F2) is the Lorentz force acting direction in the region where the fixed contact (14, 15) and the movable contact (24, 25) face each other,
The arc after the collision is stretched in a direction different from the direction of the Lorentz force action (F1, F2) at the part of the case (11) where the arc stretched in the direction of the Lorentz force action (F1, F2) collides. Guide portions (111, 112) for guiding the arc are formed on the
Further, the fixed contact holding member (12, 13) is provided by a case partition wall (113, 114) provided between the guide portion (111, 112) and the base (10) in the case (11). An electromagnetic relay characterized in that a guide portion facing portion (125, 135) facing the guide portion (111, 112) is covered.   2. The electromagnetic relay according to claim 1, wherein the guide portion (111, 112) extends from a portion of the case (11) where the arc collides toward a bottom side of the case (11). .

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