JP2015060748A - Electromagnetic relay - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a more reliable electromagnetic relay in which a fixed contact and a movable contact are never pulled apart, even if a large current flows instantaneously.SOLUTION: A movable contact member 9 extends in a direction crossing the extending direction of a first terminal member 7. A second terminal member 11 includes a first portion 11A arranged while spaced apart from the first terminal member 7 and extending along the first terminal member 7, and a second portion 11B having such a shape that fixed contacts 41, 41 are arranged at the positions where movable contacts 37, 37 come into contact with the fixed contacts 41, 41 when the movable contact member 9 is in a second state. Positional relationship of the movable contact member 9 and the second portion 11B of the second terminal member 11 is determined so that the movable contacts 37, 37 are located closer to the interval S side than the fixed contacts 41, 41.

Description

  The present invention relates to an electromagnetic relay that is built in a watt hour meter or the like and controls the supply of electric power.

  Conventionally, as an electromagnetic relay (relay) for controlling supply of electric power, for example, one disclosed in Non-Patent Document 1 or the like has been proposed.

  FIG. 4 is a diagram schematically illustrating a main part of the electromagnetic relay disclosed in Non-Patent Document 1. The electromagnetic relay having the structure shown in FIG. 4 has a first terminal member 1, a second terminal member 2, and a movable contact member 3, and is rotated by the action of a magnetic field generated by the electromagnetic coil device. The card member 4 is operated by a rotating member (not shown) to control the opening and closing of the fixed contact 5 and the movable contact 6.

Yueqing Goodwin Electronic Co., Ltd., "Relay for Coil Internal Latching Type Meter", [online], Alibaba.com, [Search September 12, 2013], Internet <URL: http: //japanese.alibaba.com /product-gs/coil-inside-latching-type-relay-for-meter-1269905774.html>

  In a state where the fixed contact and the movable contact are in contact with each other, depending on the use conditions, the electromagnetic relay has a large current that momentarily exceeds 2000 A in the first terminal member and the second terminal member. May flow. In the case of the conventional electromagnetic relay disclosed in FIG. 4, when such a large current flows, the fixed contact 5 and the movable contact 6 may be welded or melted. This is because an electromagnetic force is generated by a magnetic field generated by a current flowing through the first terminal member 1, the second terminal member 2, and the movable contact member 3, and the movable contact member 3 receives the force and instantaneously. This is because the fixed contact 5 and the movable contact 6 are separated from each other, and an arc is generated between the fixed contact 5 and the movable contact 6.

  An object of the present invention is to provide a more reliable electromagnetic relay in which a stationary contact and a movable contact are not separated even when a large current flows instantaneously.

  The electromagnetic relay of the present invention includes a first terminal member provided with a first terminal portion at one end, one end connected to the other end of the first terminal member, and the other end A movable contact member provided with a movable contact, a second terminal member provided with a second terminal part at one end, and a fixed contact provided at the other end part, an electromagnetic coil device, and an electromagnetic coil An electromagnetic relay composed of a rotation member supported so as to rotate within a predetermined angle range by the action of a magnetic field generated by the apparatus and a card portion is targeted for improvement. The card portion is engaged with the other end of the movable contact member, and the movable contact is fixed by displacing the movable contact member from the first state to the second state by the rotation of the rotation member. A member that contacts the contact and displaces the movable contact member from the fixed contact by displacing the movable contact member from the second state to the first state.

  The movable contact member extends in a direction intersecting with the direction in which the first terminal member extends, and the second terminal member is disposed with a space between the first terminal member and the first terminal member. And a second portion having a shape in which the fixed contact is arranged at a position where the movable contact contacts the fixed contact when the movable contact member is in the second state. And in this invention, the positional relationship of a movable contact member and the 2nd part of a 2nd terminal member is defined so that a movable contact may be located in a space | interval side rather than a fixed contact.

  By configuring in this way, when the fixed contact and the movable contact are in a closed state, and a current flows through the first terminal member, the second terminal member, and the movable contact member, in the above-described interval, A magnetic field is formed by the current flowing through the first terminal member, the current flowing through the second portion of the second terminal member, and the current flowing through the movable contact member. A Lorentz force acting between the magnetic field and the current flowing through the movable contact member generates a force (electromagnetic force) for pressing the movable contact toward the fixed contact on the movable contact member. Since this force acts in the direction of pressing the movable contact against the fixed contact, even if the current flowing through the first terminal member and the second terminal member becomes a large current instantaneously, the fixed contact The movable contact is not separated, and an arc is generated between the fixed contact and the movable contact, so that the contact is not welded or melted.

  When a current flows through the first terminal member, the second terminal member, and the movable contact member, the movable contact member is attracted to the second portion of the second terminal member by a magnetic field generated around the movable contact member. An attraction force generator made of a magnetic material may be further provided at a position adjacent to the movable contact member so as to generate an attraction force. By arranging the attractive force generator made of a magnetic material in this way, an attractive force is generated between the attractive force generator and the movable contact member by the magnetic field generated by the current flowing through the movable contact member, and the movable contact Since a force acts on the member in the direction of the suction force generator that is fixed, the fixed contact and the movable contact can be more reliably brought into contact with each other.

  When a plurality of movable contact members are configured, a bent portion or a curved portion may be provided between one end portion and the other end portion of the movable contact member in order to provide a degree of freedom of movement. In this case, the bent part or the curved part may be convex toward the side opposite to the side where the movable contact is provided. By comprising in this way, since it becomes possible to arrange | position the attraction | suction force generation body which consists of a movable contact member and a magnetic material closely, attraction | suction force can be raised.

It is a top view of the electromagnetic relay of this Embodiment of the state which removed the obstruction | occlusion member of the insulation case, and is a figure which shows the state which has a movable contact member in a 1st state. It is a top view of the electromagnetic relay of this Embodiment of the state which removed the obstruction | occlusion member of the insulation case, and is a figure which shows the state which has a movable contact member in a 2nd state. It is a schematic diagram which shows the force which generate | occur | produces in a movable terminal member when an electric current flows into a 1st terminal member, a 2nd terminal member, and a movable contact member. It is a figure which shows an example of the conventional electromagnetic relay.

  Hereinafter, embodiments of the electromagnetic relay of the present invention will be described in detail with reference to the drawings. 1 and 2 are plan views of the electromagnetic relay according to the present embodiment in a state where the blocking member of the insulating case is removed, and FIG. 1 is a diagram showing a state where the movable contact member is in the first state. FIG. 2 is a diagram showing a state in which the movable contact member is in the second state.

  First, in the present specification, as shown in FIG. 1, a plurality of directions are defined with respect to the electromagnetic relay 1. That is, the left-right direction (first direction D1) composed of the right direction RI and the left direction LE and the front-rear direction (second direction D2) composed of the front direction FO and the rear direction RE are defined as shown in FIG. . Further, although not shown in the figure, the direction is perpendicular to both the first direction D1 and the second direction D2, and the back direction is the downward direction and the opposite direction is the upward direction toward the paper surface of FIG. In addition, a vertical direction (third direction) consisting of a downward direction is also used. The direction used for each constituent member is the direction in which each constituent member is housed in the insulating case. 2 and 3 also use the same direction.

[overall structure]
The electromagnetic relay 1 of the present embodiment has an insulating case 3, and each constituent member is accommodated in the insulating case 3. The insulating case 3 includes a case body 5 and a closing member (not shown) that is a cover of the case body 5. The insulating case 3 includes, as main constituent members, a first terminal member 7, a movable contact member 9 fixed to the first terminal member 7, a second terminal member 11, a card unit 13, and an electromagnetic member. A coil device 15, a rotating member 17, and a suction force generator 19 are accommodated. However, the first terminal member 7 and the second terminal member 11 are accommodated in the insulating case 3 in a state in which the terminal portion protrudes outside from a slit provided in the insulating case 3.

[Configuration of each member]
<Insulation case>
The case body 5 of the insulating case 3 mainly includes a bottom wall portion 21 and a peripheral wall portion 23. The bottom wall 21 has a first side extending in the first direction D1, a second side extending in the second direction D2 orthogonal to the first side, and in the first direction D1 parallel to the first side. It has a rectangular shape composed of a third side extending and a fourth side extending in the second direction D2 in parallel with the second side. The peripheral wall portion 23 is constituted by a first side wall portion 25, a second side wall portion 27, a third side wall portion 29, and a fourth side wall portion 31 that rise upward from the first to fourth sides. Has been. The fourth side wall portion 31 is formed with a first terminal lead-out hole 33 for storing the terminal portion (first terminal portion) 8 of the first terminal member 7 in a state of protruding outward. The first side wall portion 25 is formed with a second terminal lead-out hole 35 for storing the terminal portion (second terminal portion) 12 of the second terminal member 11 in a state of protruding outward. Further, the case body 5 is formed with a wall portion for housing and fixing the constituent members.

<Terminal member and movable contact member>
The first terminal member 7 includes a terminal portion 8 at one end, and a movable contact member 9 is fixed to the other end. The movable contact member 9 is configured by combining three metal plates. The movable contact member 9 has one end fixed to the first terminal member 7 and extends in the direction (first direction D1) intersecting the direction in which the first terminal member 7 extends (second direction D2). Two movable contacts 37, 37 arranged in the third direction at the end are provided. Between the one end and the other end of the movable contact member 9, there is provided a curved portion 39 that is convex toward the side opposite to the side on which the movable contacts 37, 37 are provided.

  The second terminal member 11 is disposed with a space between the first terminal member 7 and is opposed to the first contact 11 </ b> A extending along the first terminal member 7 and the movable contacts 37, 37. And a second portion 11B provided with two fixed contacts 41, 41 arranged in the third direction. In the present embodiment, the movable contacts 37, 37 are in front of the fixed contacts 41, 41, that is, closer to the distance formed between the first terminal member 7 and the second terminal member 11. The movable contact member 9 and the second portion 11B of the second terminal member 11A are defined so as to be positioned.

<Card part>
The card portion 13 is made of an insulating material, and one end is engaged with the movable contact member 9 with the end portion of the movable contact member 9 interposed therebetween. The second terminal member 11 extends beyond the second portion 11 </ b> B and the other end is engaged with the rotating member 17.

<Electromagnetic coil device and rotating member>
The electromagnetic coil device 15 includes a coil 43 that passes through an iron core (not shown) and a pair of magnetic pole pieces 45 and 47 that are coupled to the iron core. The pair of magnetic pole pieces 45 and 47 are arranged so as to face each other at positions spaced apart from the iron core, and when the coil 43 is excited, the magnetic poles corresponding to the direction of the excitation current are changed to the free end portions 45A and 47A. To appear. The exciting current is configured to flow from a power supply terminal (not shown) connected to the coil 43.

  The rotating member 17 is disposed between the free end portions 45A and 47A of the pair of magnetic pole pieces 45 and 47. The rotating member 17 is configured by holding a permanent magnet (not shown) between two magnetic metal pieces 49 and 51 and being fixed by a rotating member main body 53. In the magnetic metal pieces 49 and 51, magnetic poles having different polarities are expressed by permanent magnets. In the present embodiment, the N pole of the permanent magnet is in contact with the magnetic metal piece 49, and the S pole of the permanent magnet is in contact with the magnetic metal piece 51. The rotation member 17 is configured to rotate within a predetermined angle range around the rotation center 55. A rotation arm 57 extends from the rotation member main body 53 and engages with the other end of the card unit 13.

[Operation of electromagnetic relay]
The opening / closing operation of the electromagnetic relay 1 of the present embodiment will be described with reference to FIGS.

<Opening action>
FIG. 1 shows a state in which the electromagnetic relay 1 of the present embodiment is in an open state. That is, a current is passed through a power feeding terminal connected to the coil 43 of the electromagnetic relay 1 in a closed state, which will be described later, so that an S pole is generated at the free end 45A and an N pole is generated at the free end 47A. When 43 is excited, the magnetic metal piece 49 is attracted to the free end 45A and the magnetic metal piece 51 is attracted to the free end 47A as shown in FIG. Then, the rotation member 17 rotates and moves the card unit 13 in the forward direction FO. Along with this, the movable contact member 9 is pressed by the card unit 13 to be displaced from the second state to the first state, and the movable contacts 37 and 37 are separated from the fixed contacts 41 and 41 (open state). . In this state, no current flows through the first terminal member 7 and the second terminal member 11.

<Closed action>
FIG. 2 shows a state where the electromagnetic relay 1 of the present embodiment is in a closed state. That is, a current is supplied to the power supply terminal connected to the coil 43 of the electromagnetic relay 1 in the open state, so that the N pole is generated at the free end 45A and the S pole is generated at the free end 47A. When excited, the magnetic metal piece 51 is attracted to the free end 45A and the magnetic metal piece 49 is attracted to the free end 47A as shown in FIG. Then, the rotation member 17 rotates and moves the card unit 13 in the rearward direction RE. Along with this, the movable contact member 9 is pulled by the card unit 13 to be displaced from the first state to the second state, and the movable contacts 37 and 37 are brought into contact with the fixed contacts 41 and 41 (closed state). ). In this state, a current flows through the first terminal member 7, the second terminal member 11, and the movable contact member 9.

  In the present embodiment, after the rotating member 17 is rotated and the contact is in an open state or a closed state, the magnetic force of the permanent magnet constituting the rotating member 17 until an excitation current is applied in the reverse direction. Thus, the position of the rotating member 17 is self-held. Therefore, after confirming that the electromagnetic relay 1 has been operated, it is possible to stop the exciting current, and it is only necessary to supply the exciting current of the coil 43 only when it is desired to change the open state / closed state. By changing the direction of the current, it is possible to switch the open / closed state of the contact.

[Force generated when closed]
FIG. 3 is a schematic diagram illustrating a force generated in the movable contact member 9 when the electromagnetic relay 1 is in a closed state and a current flows through the first terminal member 7, the second terminal member 11, and the movable contact member 9. It is. For example, in the example shown in FIG. 3, current flows in the order of the second terminal member 11 → the movable contact member 9 → the first terminal member 7 as indicated by an arrow, and the first terminal as shown in FIG. 3. A magnetic field in the same direction is generated by the current flowing through the first terminal member 7, the second terminal member 11, and the movable contact member 9 in the interval S existing between the member 7 and the second terminal member 11. The Lorentz force acting between the magnetic field and the current flowing through the movable contact member 9 generates a force (electromagnetic force) F1 that presses the movable contacts 37 and 37 toward the fixed contacts 41 and 41 on the movable contact member 9. Therefore, according to the present invention, a force is generated in the direction in which the movable contacts 37 and 37 and the fixed contacts 41 and 41 are brought into contact with the movable contact member 9 by the flowing current. 37 and the movable contacts 41 and 41 are not separated, and the contacts are not welded or melted. Even when the direction of the flowing current is reversed, the direction of the force F1 does not change.

  In the present embodiment, an attractive force generator 19 made of a magnetic material is fixedly disposed at a position adjacent to the movable contact member 9. The attractive force generator 19 is connected to the movable contact member 9 by a magnetic field generated around the movable contact member 9 when a current flows through the first terminal member 7, the second terminal member 11, and the movable contact member 9. A suction force is generated between the suction force generator 19 and a force (electromagnetic force) F <b> 2 that attracts the movable contact member 9 to the second portion 11 </ b> B of the second terminal member 11. Therefore, by arranging the suction force generator 19, it is possible to further generate a force in a direction in which the movable contacts 37, 37 are brought into contact with the fixed contacts 41, 41. It is possible to ensure contact.

  In the present embodiment, the shape of the other end of the first terminal member 7 is formed so as not to interfere with the curved portion 39 of the movable contact member 9, and the suction force is set so as to be close to the movable contact member 9. A generator 19 is disposed. As a result, the suction force between the movable contact member 9 and the suction force generator 19 can be increased.

  Although the embodiments of the present invention have been specifically described above, the present invention is not limited to these embodiments, and can of course be modified within the scope of the technical idea of the present invention. It is.

  According to the present invention, even when a large current flows through the first terminal member and the second terminal member, a force (electromagnetic force) is generated in a direction in which the movable contact is brought into contact with the fixed contact. Therefore, there is no possibility that the movable contact and the fixed contact are instantaneously separated. Therefore, a more reliable electromagnetic relay can be obtained.

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 3 Insulation case 5 Case main body 7 1st terminal member 9 Movable contact member 11 2nd terminal member 13 Card part 15 Electromagnetic coil apparatus 17 Rotating member 19 Suction force generator 21 Bottom wall part 23 Peripheral wall part 25, 27, 29, 31 First to fourth side wall portions 33 First terminal lead-out hole 35 Second terminal lead-out hole 37 Movable contact 39 Curved portion 41 Fixed contact 43 Coil 45, 47 Pair of magnetic pole pieces 49, 51 Magnetic metal Piece 53 Rotating member body 55 Rotating center 57 Rotating arm

Claims (3)

A first terminal member provided with a first terminal portion at one end;
A movable contact member having one end connected to the other end of the first terminal member and a movable contact provided on the other end;
A second terminal member provided with a second terminal portion at one end and a fixed contact at the other end;
An electromagnetic coil device;
A rotating member supported to rotate within a predetermined angular range by the action of a magnetic field generated by the electromagnetic coil device;
The movable contact member is engaged with the other end of the movable contact member, and the movable contact member is displaced from the first state to the second state by rotating the rotating member, thereby moving the movable contact member to the second state. An electromagnetic relay comprising a card portion that contacts the fixed contact and displaces the movable contact member from the second state by moving the movable contact member from the fixed state;
The movable contact member extends in a direction intersecting with a direction in which the first terminal member extends,
The second terminal member is disposed at a distance from the first terminal member and extends along the first terminal member, and the movable contact member is disposed on the second terminal member. A second portion having a shape that arranges the fixed contact at a position where the movable contact contacts the fixed contact when in a state;
The electromagnetic relationship is characterized in that the positional relationship between the movable contact member and the second portion of the second terminal member is determined so that the movable contact is positioned on the side of the distance from the fixed contact. relay.   When a current flows through the first terminal member, the second terminal member, and the movable contact member, a magnetic field generated around the movable contact member causes the movable contact member to move to the second terminal member. The electromagnetic relay according to claim 1, further comprising an attraction force generator made of a magnetic material at a position adjacent to the movable contact member so as to generate an attraction force attracting the second portion.   The bent part or the curved part which protruded toward the opposite side to the side where the movable contact is provided between one end and the other end of the movable contact member. The electromagnetic relay according to 1.

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