JP2007066843A - Electromagnetic relay - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electromagnetic relay which can make a movable contact stably contact a fixed contact at all time by cleaning foreign materials generated by arc or the like by the sliding movement of the movable contact on the fixed contact. <P>SOLUTION: The electromagnetic relay is composed of a case 2 having a hollow part 2a insides, an electromagnet 5 formed by winding a coil 5b on an iron core 5a arranged inside the hollow part 2a, fixed contacts 9, 10 fixes inside the hollow part 2a, and a movable contact 7 supported in the hollow part 2a, capable of contact with and separate from a first contact 9 or a second contact 10. The fixed contacts 9, 10 has a sliding pieces 9a, 9b which can slide in a state that the movable contact 7 is contacted. The movable contact 7 is made of elastic wire material, and made possible to slide on a sliding contact 9b, 10b of the fixed contact 9 by contacting with and separating from the iron core 5a by the elastic force of the wire material by connecting and disconnecting a current to the coil 5b. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an electromagnetic relay, for example, an electromagnetic relay capable of switching a switch circuit by moving a movable contact attracted to and separated from an electromagnet.

A conventional electromagnetic relay will be described in Patent Document 1. As shown in FIG. 3, a conventional electromagnetic relay 30 has an electromagnet 32 formed on the right side of a body 31, and the electromagnet 32 includes an iron core 33, The coil 34 is connected to the coil terminal 34 a, the yoke 35, and the movable knitting 36. The yoke 35 is formed in a substantially L shape with one piece 35a and the other side 35, and the movable piece 36 is formed in a substantially L shape with one piece 36a and the other side 36b.
The movable piece 36 in the initial state before energizing the coil 34 is elastically biased in a direction in which the other side 36b approaches the other side 36b of the yoke 35 by a hinge spring (not shown).

Further, a protruding wall 37 is formed protruding upward from the bottom 31 a of the body 31. A cutout groove 38 is formed in the protruding wall 37, and a drive member 39 is slidably held in the cutout groove 38 in the left-right direction in the figure.
The drive member 39 has a holding piece 40 held substantially horizontally in the notch groove 38 and an operating piece 41 orthogonal to the holding piece 40, and the drive member 39 slides in the left direction in the figure. Thus, the operating piece 41 can press the movable contact leaf spring 42.

The movable contact leaf spring 42 is formed with a movable contact portion 42 a that is a butt contact, and the movable contact spring 42 is electrically connected to a common terminal (not shown) that protrudes downward from the body 31.
A fixed contact plate 43 is disposed on the left side of the movable contact plate spring 42 facing the movable contact plate spring 42 with a gap of a predetermined dimension. The fixed contact plate 43 has a movable contact portion 42 a of the movable contact plate spring 42. The fixed contact part 43a is formed in the part which opposes, and the fixed contact plate 43 is electrically connected to the fixed terminal 43b which protrudes below from the body 31. FIG.

In such an operation of the conventional electromagnetic relay 30, when a predetermined current is applied to the coil 34, the coil 34 is excited and the piece 36 a of the movable piece 36 in the initial state is attracted to the iron core 33.
Then, the movable piece 36 moves the drive member 39 in the left direction in the figure by rotating the other side 36b in the left direction in the figure against the elastic force of the hinge spring.
Then, the operating piece 41 of the drive member 39 presses the movable contact plate spring 42 in the left direction in the figure, and the movable contact portion 42a, which is a butt contact, strikes the fixed contact portion 43a of the fixed contact plate 43 to electrically Conduct.

As a result, the switch circuit between the common terminal (not shown) and the fixed terminal 43b is turned ON.
Further, when the current applied to the coil 34 is removed, the one piece 36a of the movable piece 36 is separated from the iron core 33 by the biasing force of the hinge spring (not shown), and between the common terminal and the fixed terminal 43b. The switch circuit is turned off.
Japanese Patent Laid-Open No. 11-016474

However, in the conventional electromagnetic relay 30 as described above, the movable piece 36 moves the drive member 39 against the elastic force of the hinge spring and presses the movable contact spring 42. A large magnetic force had to be generated on the core.
Therefore, since a large current had to be passed through the coil, there was a problem of increasing power consumption.
Further, foreign matters such as metal wear powder caused by an arc (spark) generated when the movable contact portion 42a keys the fixed contact portion 43a and dust in the air adhere to the movable contact portion 42a or the fixed contact portion 43a.
For this reason, there is a possibility that the connection between the movable contact portion 42a and the fixed contact portion 43a becomes unstable due to the foreign matter.
The present invention has been made to solve the above-described problems, and can drive the movable contact with low power consumption, and can slide the movable contact with respect to the fixed contact for foreign matter generated by an arc or the like. It is an object of the present invention to provide an electromagnetic relay that can be constantly cleaned to stabilize the connection between the fixed contact and the movable contact.

As a first means for solving the above problems, an electromagnetic relay according to the present invention includes a housing having a hollow portion therein, an electromagnet in which a coil is wound around an iron core disposed in the hollow portion, and the inside of the hollow portion. A fixed contact that is fixed to the cavity, and a movable contact that is supported in the cavity and is movable toward and away from the fixed contact,
The fixed contact has a sliding contact piece that can slide in a state in which the movable contact is in contact, and the movable contact is made of an elastic wire and performs energization and non-energization on the coil. Thus, the sliding force can be slidable with respect to the sliding contact piece of the fixed contact by being brought into and out of contact with the iron core by the elastic force of the wire.
Further, as a second means for solving the above-described problem, a movable plate made of a magnetic material is fixed to the movable contact at a position facing the iron core of the electromagnet, and when the coil is energized, The movable plate is attracted to the iron core against the elastic force of the movable contact.
Further, as a third means for solving the above-mentioned problem, the movable plate has a suction portion formed in a portion facing the iron core, and the suction portion is a portion of the iron core facing the suction portion. It is characterized in that it is formed larger than the area.

Further, as a fourth means for solving the above-mentioned problem, the movable contact is formed of a torsion coil spring having a support portion formed by winding a part of the wire in a coil shape, and is formed in a bar shape formed in the hollow portion The movable contact support portion is inserted into and supported by the movable contact support portion, and the movable contact portion is formed to extend from the support portion to one side of the fixed contact side. By making contact with and separating from the iron core, the contact portion rotates with the support portion supported by the movable contact support portion as a fulcrum, and is slidable with respect to the sliding contact piece of the fixed contact. It is characterized by being.
Further, as a fifth means for solving the above problem, the movable contact has a shape formed with a terminal connection portion that extends from the support portion to the other side and can be connected to a common terminal embedded and supported in a housing. It is substantially L-shaped, and the angle between the contact portion and the terminal connection portion is an obtuse angle.
Further, as a sixth means for solving the above-mentioned problem, the fixed contact is a first fixed contact to which the contact portion can be connected in an initial state where the fixed contact is separated from the iron core by the elastic force of the movable contact. And a second fixed contact to which the contact portion can be connected when the movable plate is attracted to the iron core.

The fixed contact of the electromagnetic relay of the present invention has a sliding contact piece that can slide in a state in which the movable contact is in contact, and the movable contact is made of an elastic wire, and can be energized and de-energized to the coil. By doing so, it is possible to slide against the sliding contact piece of the fixed contact with the elastic force of the wire rod, so that the movable contact contacts and separates from the fixed contact with its own elastic force Therefore, it is possible to provide an electromagnetic relay capable of reducing the amount of power supplied to the electromagnet coil and saving power. Further, the cost can be reduced by reducing the number of parts.
Further, a movable plate made of a magnetic material is fixed to the movable contact at a position facing the iron core of the electromagnet, and when the coil is energized, the movable plate is attracted to the iron core against the elastic force of the movable contact. Therefore, the contact portion of the movable contact can be reliably rotated and electrically connected to the fixed contact.
Also, the movable plate is formed with a suction portion at a portion facing the iron core, and this suction portion is formed larger than the area of the iron core at the portion facing the suction portion. The movable contact can be more reliably adsorbed to the iron core.

In addition, the movable contact consists of a torsion coil spring with a portion of the wire wound in a coil shape as a support, and the support is inserted into and supported by a rod-shaped movable contact support formed in the cavity. The contact portion extends from the support portion to one side of the fixed contact side, and the movable contact is a contact portion with the support portion supported by the movable contact support portion as a fulcrum by moving the movable plate to and away from the iron core. , And can slide with respect to the sliding contact piece of the fixed contact. Slide the piece. As a result, foreign matters such as iron powder adhering to the movable contact or the fixed contact can be removed and cleaned, and the movable contact and the fixed contact can be stably connected.
In addition, the movable contact extends from the support portion to the other side and is formed with a terminal connection portion that can be connected to a common terminal embedded and supported in the housing, so that the shape is substantially L-shaped. Since the angle between them is an obtuse angle, the movable contact when the coil is not energized can be reliably separated from the electromagnet.
In addition, the fixed contact can be connected to the first fixed contact to which the contact portion can be connected in the initial state of being separated from the iron core by the elastic force of the movable contact and when the movable plate is attracted to the iron core. Since the second fixed contact is arranged, the movable contact can be switched between the common terminal and the two circuits between the first fixed contact and the second fixed terminal by moving away from the iron core. it can. Therefore, an electromagnetic relay capable of switching a plurality of circuits with a small number of parts can be provided.

Embodiments of an electromagnetic relay according to the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of an essential part for explaining the electromagnetic relay of the present invention, and FIG. 2 is a cross-sectional view taken along the line 2-2 of FIG.
First, an electromagnetic relay 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. A substantially cubic housing 2 made of a resin material and having a hollow portion 2a is disposed therein. Yes. The cavity 2a of the housing 2 is formed by being surrounded by the first to fourth side walls 2b to 2e, the front side wall 2f, and the rear side wall 2g.

Further, on the left side of the inner surface of the rear side wall 2g of the housing 2, a first fixed contact support portion 3 that is partially thicker than the rear side wall 2g and can support a first fixed contact 9 described later. Is provided. Further, on the left side of the cavity portion 2a of the housing 2 shown in FIG. 1, a second fixed contact support portion 4 that is in contact with the second side wall 2c on the left side and can support a second fixed contact 10 described later is shown in FIG. As shown in FIG. 3, the front wall 2f is formed to protrude from the inner surface at a predetermined height.
In addition, an electromagnet 5 is disposed in a substantially central portion on the front side wall 2f in the hollow portion 2a. The electromagnet 5 is configured by winding a coil 5b around an iron core 5a made of a magnetic material. Has been. And by supplying a predetermined current to the coil 5b, the coil 5b is excited and the iron core 5a is magnetized.

Further, a rod-like movable contact support portion 6 is formed on the right side in the cavity 2a shown in FIG. 1, and a movable contact 7 made of a conductive wire having elasticity is supported on the movable contact support portion 6. ing.
The movable contact 7 is composed of a torsion coil spring having a portion of a wire having a predetermined thickness wound in a coil shape as a support portion 7a, and the support portion 7a is inserted into the movable contact support portion 6 in the cavity 2a. It is supported.
Further, the movable contact 7 is formed with a contact portion 7b extending from the support portion 7a to the first and second fixed contacts 9, 10 described later by a predetermined length. That is, the movable contact 7 is formed with a contact portion 7b extending from the support portion 7a in one direction on the first and second fixed contacts 9, 10 described later. The contact portion 7b can be brought into and out of contact with first and second fixed contacts 9, 10 described later.

The movable contact 7 having the support portion 7a inserted and supported by the movable contact support portion 6 extends from the support portion 7a to the other side and can be connected to a later-described common terminal 13 embedded and supported in the front side wall 2f of the housing 2. A connecting portion 7c is formed. The movable contact 7 has an obtuse angle α between the contact portion 7b and the terminal connection portion 7c with the support portion 7a interposed therebetween.
The movable contact 7 made of a torsion coil spring has a movable plate 8 made of a magnetic material at a position facing the iron core 5a of the electromagnet 5 at a portion extending to the first and second fixed contacts 9, 10 described later. The movable contact 7 and the movable plate 8 are integrated by being fixed by spot welding or the like.

The movable plate 8 has a suction portion 8a formed in a portion facing the iron core 5a, and the suction portion 8a is formed larger than the area of the iron core 5a facing the suction portion 8a.
Therefore, by energizing the coil 5b, it is possible to reliably attract the suction portion 8a having a large area of the movable plate 8 to the magnetized iron core 5a.
The movable plate 8 is located outside the movable contact 7 and is bent in a substantially L shape like the fixed contact 7, and extends from the support portion 7 a of the movable contact 7 by a predetermined length downward in the figure. A fixed portion 8 b is formed, and this fixed portion 8 b is sandwiched and supported between the terminal connection portion 7 c of the movable contact 7 and the first side wall 2 b of the housing 2.

A first fixed contact 9 is embedded and supported in the first fixed contact support 3 in the cavity 2a of the housing 2, and the movable plate 8 is separated from the iron core 5a when the coil 5b of the electromagnet 5 is not energized. The contact portion 7b of the movable contact 7 in the initial state is rotated upward in the figure and can be electrically connected to the first fixed contact 9.
The first fixed contact 9 is made of a metal plate having elasticity such as a phosphor bronze plate, and is embedded in the first fixed contact support 3 of the housing 2 to be connected to a first fixed terminal 14 described later. A pair of sliding contact pieces 9b, 9b are integrally formed extending from the left and right ends of the terminal connection portion 9a shown in FIG.

The pair of sliding contact pieces 9b, 9b are bent in a substantially U shape on opposite sides to form a pair of free end-shaped sliding pieces 9c, 9c. They are elastically opposed to each other.
And the contact part 7b of the movable contact 7 which rotates is pinched between a pair of sliding pieces 9c and 9c which elastically contact mutually, and it can slide. Further, the second fixed contact 10 is embedded and supported in the second fixed contact support 4 in the cavity 2a, and when the movable plate 8 is attracted to the iron core 5a by energizing the coil 5b, The contact portion 7 b is rotated in the direction of arrow A below the figure so that it can be electrically connected to the second fixed contact 10.

The second fixed contact 10 is formed of the same material and shape as the first fixed contact 9, and the terminal connection portion 10a is embedded and supported in the second fixed contact support portion 4 to be connected to a second fixed terminal 15 described later. Then, a pair of sliding contact pieces 10b and 10b are integrally formed extending upward from both ends of the terminal connection portion 10a.
The pair of sliding contact pieces 10b and 10b are formed as free-end sliding pieces 10c and 10c which are bent in a U shape and elastically contact each other.
A contact portion 7b of the rotating movable contact 7 is sandwiched between a pair of sliding pieces 10c and 10c which are elastically contacted with each other, and can slide.

The first lead wire 5c and the second lead wire 5d are drawn from the coil 5b of the electromagnet 5. Further, first and second input terminals 11 and 12 are embedded in the front side wall 2f of the housing 2 so as to protrude outward, and the first lead wire 5c is connected to the first input terminal 11 and the second lead wire. 5 d is electrically connected to the second input terminal 12.
Further, a common terminal 13 that is electrically connected to the terminal connection portion 7c of the movable contact 7 is embedded in the front side wall 2f so as to protrude outward.

Further, first and second fixed terminals 14 and 15 are embedded in the front side wall 2f of the housing 2 so as to protrude outward. The first fixed terminal 14 is electrically connected to the terminal connection portion 9 a of the first fixed contact 9 embedded and supported in the first fixed contact support portion 3 of the housing 2.
In addition, the second fixed terminal 15 is electrically connected to an attachment notation 10 a of the second fixed contact 10 embedded and supported in the second fixed contact support portion 4 of the housing 2.

The operation of the electromagnetic relay 1 having such a configuration will be described. The movable contact 7 in the initial state when the coil 5b of the electromagnet 5 is not energized has an angle between the contact portion 7b and the terminal connection portion 7c by its own elastic force. The obtuse angle is α, and the suction portion 8a of the movable plate 8 is separated from the iron core 5a by a predetermined dimension.
The movable contact 7 in the initial state is such that the contact portion 7 b is connected to the first fixed contact 9, and the common terminal 13 and the first fixed terminal 14 are electrically connected via the movable contact 7 and the first fixed contact 9. Connected.

Thereafter, when a predetermined current is applied to the coil 5b of the electromagnet 5, the attracting portion 8a of the movable plate 8 is attracted to the magnetized iron core 5a.
As a result, the contact portion 7b of the movable contact 7 in the initial state rotates to the lower side of the arrow A shown in FIG. 1 against the elastic force of the wire. Then, the contact portion 7b separated from the first fixed contact 9 slides between the pair of sliding pieces 10c that are elastically opposed to each other, and the movable contact 7 is connected to the second fixed contact 10, and the common terminal 13 and The second fixed terminal 15 is electrically connected via the movable contact 7 and the second fixed contact 10 to switch the switch circuit.

In such an electromagnetic relay 1 of the present invention, the contact portion 7b of the movable contact 7 slides on the slide pieces 9c, 10c formed on the slide contact pieces 9b, 10b of the first and second fixed contacts 9, 10. Therefore, foreign matters such as metal powder or dust generated by an arc or the like can be removed on the sliding pieces 9c and 10c.
Further, since the contact portion 7b of the movable contact 7 is elastically sandwiched between the pair of sliding pieces 9c, 9c and 10c, 10c facing each other and slides, even if vibration or the like is applied from the outside, it is electrically Connection can be stabilized. (Can reduce the occurrence of chattering and other problems)

In the embodiment of the present invention, the two fixed contacts, the first and second fixed contacts 9 and 10, are described. However, only one of them may be provided.
Moreover, although the sliding contact pieces 9b and 10b of the first and second fixed contacts 9 and 10 have been described as being bent in a substantially U shape, the contact portion 7b of the movable contact 7 is elastically slidable. Any sliding piece may be used. (For example, the contact portion 7b slides on an inclined surface formed by inclining one metal plate)
The first and second fixed contacts 9, 10 have been described as a pair of substantially U-shaped sliding contact pieces 9b, 10b facing each other, but one substantially U-shaped sliding contact has been described. The movable contact 7 may be slid with respect to the pieces 9b and 10b.

It is principal part sectional drawing explaining the electromagnetic relay of this invention. It is 2-2 sectional drawing of FIG. It is a perspective view explaining the conventional electromagnetic relay.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic relay 2 Case 2a Cavity part 2b-2e 1st-4th side wall 2f Front side wall 2g Rear side wall 3 1st fixed contact support part 4 2nd fixed contact support part 5 Electromagnet 5a Iron core 5b Coil 5c 1st 1 lead wire 5d 2nd lead wire 6 movable contact support part
7 Movable contact 7a Coiled part 7b Contact part 7c Terminal connection part 8 Movable plate 8a Adsorption part 8b Fixed part 9 First fixed contact 9a Terminal connection part 9b Sliding contact piece 9c Sliding piece 10 Second fixed contact 10a Terminal connection part 10b Sliding contact piece 10c Sliding piece 11 First input terminal 12 Second input terminal 13 Common terminal 14 First fixed terminal 15 Second fixed terminal

Claims (6)

A casing having a hollow portion therein, an electromagnet in which a coil is wound around an iron core disposed in the hollow portion, a fixed contact fixed in the hollow portion, and supported in the hollow portion with respect to the fixed contact Movable contacts that can be
The fixed contact has a sliding contact piece that can slide in a state in which the movable contact is in contact, and the movable contact is made of an elastic wire and performs energization and non-energization on the coil. The electromagnetic relay is characterized in that it is slidable with respect to the sliding contact piece of the fixed contact by being brought into and out of contact with the iron core by the elastic force of the wire.   A movable plate made of a magnetic material is fixed to the movable contact at a position facing the iron core of the electromagnet, and when the coil is energized, the movable plate is against the elastic force of the movable contact. The electromagnetic relay according to claim 1, wherein the electromagnetic relay is attracted to a core.   The movable plate has a suction portion formed in a portion facing the iron core, and the suction portion is formed larger than an area of the iron core in a portion facing the suction portion. Item 3. The electromagnetic relay according to item 1 or 2.   The movable contact is formed of a torsion coil spring having a portion obtained by winding a part of the wire in a coil shape as a support portion, and the support portion is inserted and supported by a rod-shaped movable contact support portion formed in the hollow portion, The movable contact extends from the support portion to one side of the fixed contact side to form a contact portion, and the movable contact is moved to and away from the iron core by moving the movable plate to and from the iron core. 4. The electromagnetic wave according to claim 2, wherein the contact portion rotates with the supported portion supported as a fulcrum and is slidable with respect to the sliding contact piece of the fixed contact. 5. relay.   The movable contact is formed with a terminal connection portion that extends from the support portion to the other side and can be connected to a common terminal embedded and supported in a housing, and has a substantially L shape. The contact portion and the terminal connection portion The electromagnetic relay according to claim 4, wherein an angle between and is formed as an obtuse angle. In the initial state where the fixed contact is separated from the iron core by the elastic force of the movable contact itself, the fixed contact is connectable to the contact portion, and when the movable plate is adsorbed to the iron core, 6. The electromagnetic relay according to claim 4, wherein a second fixed contact to which the contact portion can be connected is disposed.

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